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# Porting to Qt 4

This document describes porting applications from Qt 3 to Qt 4. The document isn't entirely finished yet; it is expected to be more complete in Qt 4.0 beta 2 and in the final release.

If you haven't yet made the decision about porting, or are unsure about whether it is worth it, take a look at the key features offered by Qt 4.

The Qt 4 series is not binary compatible with the 3 series. This means programs compiled for Qt 3 must be recompiled to work with Qt 4. Qt 4 is also not completely source compatible with 3, however nearly all points of incompatibility cause compiler errors or run-time messages (rather than mysterious results). Qt 4 includes many additional features and discards obsolete functionality. Porting from Qt 3 to Qt 4 is straightforward, and once completed makes the considerable additional power and flexibility of Qt 4 available for use in your applications.

To port code from Qt 3 to Qt 4:

1. Briefly read the porting notes below to get an idea of what to expect.
2. Be sure that your code compiles and runs well on all your target platforms with Qt 3.
3. Add the line `QT += compat` to your `.pro` file if you use `qmake`; otherwise, edit your makefile or project file to link against the Qt3Compat library and add `-DQT_COMPAT` to your compiler flags. (You might also need to specify other libraries. See Getting Started with Qt 4 for details.)
4. Run the qt3to4 porting tool. The tool will go through your source code and adapt it to Qt 4. It will also attempt to convert `.ui` file. Be aware, though, that the `.ui` file convertor is still at an experimental stage, requiring you to put in some manual work.
5. Recompile with Qt 4. For each error, search below for related identifiers (e.g., function names, class names). This document mentions all relevant identifiers to help you get the information you need at the cost of being a little verbose.

The qt3to4 porting tool replaces occurrences of Qt 3 classes that don't exist anymore in Qt 4 with the corresponding compatibility class; for example, `QListBox` is turned into `Q3ListBox`.

At some point, you might want to stop linking against the Qt 3 compatibility library and take advantage of Qt 4's new features. The instructions below explain how to do that for each compatibility class.

In addition to the compatibility classes (such as `Q3Action`, `Q3ListBox`, and `Q3ValueList`), Qt 4 provides compatibility functions when it's possible for an old API to cohabit with the new one. For example, QString provides a QString::simplifyWhiteSpace() compatibility function that's implemented inline and that simply calls QString::simplified(). The compatibility functions are not documented here; instead, they are documented for each class.

If you have the line `Qt += compat` in you `.pro` file, `qmake` will automatically define the `QT_COMPAT` symbol, turning on compatibility function support. You can also define the symbol manually (e.g., if you don't want to link against the `Qt3Compat` library), or you can define `QT_COMPAT_WARNINGS` instead, telling the compiler to emit a warning when a compatibility function is called. (This works only with GCC 3.2+ and MSVC 7.)

If you get stuck, ask on the qt4-preview-feedback mailing list. If you are a licensed customer, be aware that Trolltech cannot provide technical support for beta releases. See our Feedback Policy for details.

Table of contents:

- Type Names
- Enum Values
- Properties
- Explicit Sharing
- QAccel
- QAccessibleInterface
- QAccessibleTitleBar
- QAction
- QActionGroup
- QApplication
- QAquaStyle
- QAsciiCache<T>
- QAsciiDict<T>
- QAsyncIO
- QBackInsertIterator
- QBitArray
- QButton
- QButtonGroup
- QByteArray
- QCache<T>
- QCanvas
- QColorGroup
- QColorDrag
- QComboBox
- QCString
- QDataBrowser
- QDataPump
- QDataSink
- QDataSource
- QDataTable
- QDataView
- QDateEdit
- QDateTimeEditBase
- QDateTimeEdit
- QDeepCopy<T>
- QDial
- QDict<T>
- QDir
- QDns

- QDockArea
- QDockWindow
- QDragObject
- QDropSite
- QEditorFactory
- QEventLoop
- QFileDialog
- QFrame
- QFtp
- QGLayoutIterator
- QGrid
- QGridLayout
- QGridView
- QGroupBox
- QHBox
- QHeader
- QHttp
- QIconFactory
- QIconView
- QImageDrag
- QIntCache<T>
- QIntDict<T>
- QIODevice
- QIODeviceSource
- QIconFactory
- QLabel
- QLayout
- QLayoutIterator
- QLineEdit
- QListBox
- QListView
- QLocalFs
- QMainWindow
- QMemArray<T>
- QMessageBox
- QMimeSourceFactory
- QMultiLineEdit
- QNetworkProtocol
- QObject

- QObjectDictionary
- QObjectList
- QPaintDevice
- QPaintDeviceMetrics
- QPainter
- QPixmap
- QPointArray
- QProcess
- QProgressBar
- QProgressDialog
- QPtrCollection<T>
- QPtrDict<T>
- QPtrList<T>
- QPtrQueue<T>
- QPtrStack<T>
- QPtrVector<T>
- QPushButton
- QRangeControl
- QRegion
- QScrollBar
- QScrollView
- QServerSocket
- QShared
- QSignal
- QSimpleRichText
- QSlider
- QSocket
- QSocket
- QSortedList
- QSplitter
- QSpinBox
- QSqlCursor
- QSqlDatabase
- QSqlEditorFactory
- QSqlError
- QSqlFieldInfo
- QSqlForm
- QSqlPropertyMap
- QSqlQuery

- QSqlRecord
- QSqlRecordInfo
- QSqlSelectCursor
- QStoredDrag
- QStr(I)List
- QStr(I)Vec
- QString
- QStringList
- QStyleSheet
- QSyntaxHighlighter
- QTabBar
- QTabDialog
- QTabWidget
- QTable
- QTextDrag
- QTextEdit
- QTextOStreamIterator
- QTextView
- QTimeEdit
- QToolBar
- QToolButton
- QUriDrag
- QUrl
- QUrlOperator
- QValueList<T>
- QValueVector<T>
- QVariant
- QVBox
- QWhatsThis
- QWidget
- QWidgetIntDict
- QWidgetList
- QWidgetStack
- QWizard
- QWorkspace
- Virtual Functions

## Type Names

The table below lists the classes that have been renamed in Qt 4. If you compile your applications with `QT_COMPAT` defined, the old names will be available.

Whenever you see an occurrence of the name on the left, you can safely replace it with the Qt 4 equivalent in your program. The qt3to4 tool handles performs the conversion automatically.

Qt 3 class name | Qt 4 class name
--- | ---
QGrid | QGridWidget
QHBox | QHBoxWidget
QIconSet | QIcon
QVBox | QVBoxWidget
QWMatrix | QMatrix
QGuardedPtr | QPointer

The table below lists the enums and typedefs that have been renamed in Qt 4. If you compile your applications with `QT_COMPAT` defined, the old names will be available.

Whenever you see an occurrence of the name on the left, you can safely replace it with the Qt 4 equivalent in your program. The qt3to4 tool handles performs the conversion automatically.

Qt 3 type name | Qt 4 type name
--- | ---
QApplication::ColorMode | QApplication::ColorSpec
QButton::ToggleState | QCheckBox::ToggleState
QCursorShape | Qt::CursorShape
QFile::FilterSpec | QFile::Filters
QFile::PermissionSpec | QFile::Permission
QFile::SortSpec | QFile::SortFlags
QFile::Status | QFile::Error
QFileInfo::PermissionSpec | QFile::Permission
QGrid::Direction | Qt::Orientation
QGridWidget::Direction | Qt::Orientation
QIODevice::Offset | Q_LONGLONG
QImage::ScaleMode | Qt::AspectRatioMode
QSize::ScaleMode | Qt::AspectRatioMode
QSocket::Error | Qt::SocketError
QSocket::State | Qt::SocketState
QStyle::SCFlags | QStyle::SubControls
QStyle::SFlags | QStyle::StyleFlags
QTS | QTextStream
QUrlDrag | QUriDrag
QWidget::FocusPolicy | Qt::FocusPolicy
Q_LLONG | Q_LONGLONG
Q_ULLONG | Q_ULONGLONG
Qt::Dock | Qt::ToolBarDock
Qt::MacintoshVersion | QSysInfo::MacVersion
Qt::TextFlags | Qt::TextFlag
Qt::WindowsVersion | QSysInfo::WinVersion

## Enum Values

The table below lists the enum values that have been renamed in Qt 4. If you compile your applications with `QT_COMPAT` defined, the old names will be available.

Whenever you see an occurrence of the name on the left, you can safely replace it with the Qt 4 equivalent in your program. The qt3to4 tool handles performs the conversion automatically.

Qt 3 enum value name | Qt 4 enum value name
--- | ---
IO_Append | QIODevice::Append
IO_ReadOnly | QIODevice::ReadOnly
IO_ReadWrite | QIODevice::ReadWrite
IO_Translate | QIODevice::Translate
IO_Truncate | QIODevice::Truncate
IO_WriteOnly | QIODevice::WriteOnly
QAccessible::Moveable | QAccessible::Movable
QApplication::CustomColors | QApplication::CustomColor
QApplication::NormalColors | QApplication::NormalColor
QButton::NoChange | QCheckBox::NoChange
QButton::Off | QCheckBox::Off
QButton::On | QCheckBox::On
QChar::Single | QChar::NoDecomposition
QChar::byteOrderMark | QChar::ByteOrderMark
QChar::byteOrderSwapped | QChar::ByteOrderSwapped
QChar::nbsp | QChar::Nbsp
QChar::null | QChar::Null
QChar::replacement | QChar::ReplacementCharacter
QDir::DefaultFilter | QDir::NoFilter
QDir::DefaultSort | QDir::NoSort
QEvent::AccelOverride | QCoreEvent::ShortcutOverride
QEvent::CaptionChange | QCoreEvent::WindowTitleChange
QEvent::IMCompose | QCoreEvent::InputMethodCompose
QEvent::IMEnd | QCoreEvent::InputMethodEnd
QEvent::IMStart | QCoreEvent::InputMethodStart
QEvent::IconChange | QCoreEvent::WindowIconChange
QFileInfo::ExeGroup | QFile::ExeGroup
QFileInfo::ExeOther | QFile::ExeOthe
QFileInfo::ExeOwner | QFile::ExeOwner
QFileInfo::ExeUser | QFile::ExeUser
QFileInfo::ReadGroup | QFile::ReadGroup
QFileInfo::ReadOther | QFile::ReadOther
QFileInfo::ReadOwner | QFile::ReadOwner
QFileInfo::ReadUser | QFile::ReadUser
QFileInfo::WriteGroup | QFile::WriteGroup
QFileInfo::WriteOther | QFile::WriteOther
QFileInfo::WriteOwner | QFile::WriteOwner
QFileInfo::WriteUser | QFile::WriteUser
QFrame::GroupBoxPanel | QFrame::StyledPanel
QFrame::LineEditPanel | QFrame::StyledPanel
QFrame::MenuBarPanel | QFrame::StyledPanel
QFrame::PopupPanel | QFrame::StyledPanel
QFrame::TabWidgetPanel | QFrame::StyledPanel
QFrame::ToolBarPanel | QFrame::StyledPanel
QImage::ScaleFree | Qt::IgnoreAspectRatio
QImage::ScaleMax | Qt::KeepAspectRatioByExpanding
QImage::ScaleMin | Qt::KeepAspectRatio
QMacStyle::SizeNone | QMacStyle::SizeDefault
QSize::ScaleFree | Qt::IgnoreAspectRatio
QSize::ScaleMax | Qt::KeepAspectRatioByExpanding
QSize::ScaleMin | Qt::KeepAspectRatio
QSizePolicy::Horizontal | QSizePolicy::Horizontally
QSizePolicy::Vertical | QSizePolicy::Vertically
QSlider::Above | QSlider::TicksAbove
QSlider::Below | QSlider::TicksBelow
QSlider::Both | QSlider::TicksBothSides
QSlider::Left | QSlider::TicksLeft
QSlider::NoMarks | QSlider::NoTicks
QSlider::Right | QSlider::TicksRight
QSocket::Closing | Qt::ClosingState
QSocket::Connected | Qt::ConnectedState
QSocket::Connecting | Qt::ConnectingState
QSocket::Connection | Qt::ConnectedState
QSocket::ErrConnectionRefused | Qt::ConnectionRefusedError
QSocket::ErrHostNotFound | Qt::HostNotFoundError
QSocket::ErrSocketRead | Qt::UnknownSocketError
QSocket::HostLookup | Qt::HostLookupState
QSocket::Idle | Qt::UnconnectedState
QSqlError::Connection | QSqlError::ConnectionError
QSqlError::None | QSqlError::NoError
QSqlError::Statement | QSqlError::StatementError
QSqlError::Transaction | QSqlError::TransactionError
QSqlError::Unknown | QSqlError::UnknownError
QStyle::SH_UnderlineAccelerator | QStyle::SH_UnderlineShortcut
QStyle::Style_Default | QStyle::Style_None
QTextEdit::MovePgDown | QTextEdit::MovePageDown
QTextEdit::MovePgUp | QTextEdit::MovePageUp
QToolButton::Right | QToolButton::BesideIcon
QToolButton::Under | QToolButton::BelowIcon
QValidator::Valid | QValidator::Intermediate
QVariant::IconSet | QCoreVariant::Icon
QWidget::ClickFocus | Qt::ClickFocus
QWidget::NoFocus | Qt::NoFocus
QWidget::StrongFocus | Qt::StrongFocus
QWidget::TabFocus | Qt::TabFocus
QWidget::WheelFocus | Qt::WheelFocus
Qt::AltButton | Qt::AltModifier
Qt::Ascending | Qt::AscendingOrder
Qt::Bottom | Qt::DockBottom
Qt::BottomLeft | Qt::BottomLeftCorner
Qt::BottomRight | Qt::BottomRightCorner
Qt::BreakAnywhere | Qt::TextWrapAnywhere
Qt::ControlButton | Qt::ControlModifier
Qt::Descending | Qt::DescendingOrder
Qt::DontClip | Qt::TextDontClip
Qt::DontPrint | Qt::TextDontPrint
Qt::ExpandTabs | Qt::TextExpandTabs
Qt::IncludeTrailingSpaces | Qt::TextIncludeTrailingSpaces
Qt::KeyButtonMask | Qt::KeyboardModifierMask
Qt::Key_BackSpace | Qt::Key_Backspace
Qt::Key_BackTab | Qt::Key_Backtab
Qt::Key_MediaPrev | Qt::Key_MediaPrevious
Qt::Key_Next | Qt::Key_PageDown
Qt::Key_Prior | Qt::Key_PageUp
Qt::Key_aacute | Qt::Key_Aacute
Qt::Key_acircumflex | Qt::Key_Acircumflex
Qt::Key_adiaeresis | Qt::Key_Adiaeresis
Qt::Key_ae | Qt::Key_AE
Qt::Key_agrave | Qt::Key_Agrave
Qt::Key_aring | Qt::Key_Aring
Qt::Key_atilde | Qt::Key_Atilde
Qt::Key_ccedilla | Qt::Key_Ccedilla
Qt::Key_eacute | Qt::Key_Eacute
Qt::Key_ecircumflex | Qt::Key_Ecircumflex
Qt::Key_ediaeresis | Qt::Key_Ediaeresis
Qt::Key_egrave | Qt::Key_Egrave
Qt::Key_eth | Qt::Key_ETH
Qt::Key_iacute | Qt::Key_Iacute
Qt::Key_icircumflex | Qt::Key_Icircumflex
Qt::Key_idiaeresis | Qt::Key_Idiaeresis
Qt::Key_igrave | Qt::Key_Igrave
Qt::Key_ntilde | Qt::Key_Ntilde
Qt::Key_oacute | Qt::Key_Oacute
Qt::Key_ocircumflex | Qt::Key_Ocircumflex
Qt::Key_odiaeresis | Qt::Key_Odiaeresis
Qt::Key_ograve | Qt::Key_Ograve
Qt::Key_oslash | Qt::Key_Ooblique
Qt::Key_otilde | Qt::Key_Otilde
Qt::Key_thorn | Qt::Key_THORN
Qt::Key_uacute | Qt::Key_Uacute
Qt::Key_ucircumflex | Qt::Key_Ucircumflex
Qt::Key_udiaeresis | Qt::Key_Udiaeresis
Qt::Key_ugrave | Qt::Key_Ugrave
Qt::Key_yacute | Qt::Key_Yacute
Qt::Keypad | Qt::KeypadModifier
Qt::Left | Qt::DockLeft
Qt::MV_10_DOT_0 | QSysInfo::MV_10_0
Qt::MV_10_DOT_1 | QSysInfo::MV_10_1
Qt::MV_10_DOT_2 | QSysInfo::MV_10_2
Qt::MV_10_DOT_3 | QSysInfo::MV_10_3
Qt::MV_10_DOT_4 | QSysInfo::MV_10_4
Qt::MV_9 | QSysInfo::MV_9
Qt::MV_CHEETAH | QSysInfo::MV_10_0
Qt::MV_JAGUAR | QSysInfo::MV_10_2
Qt::MV_PANTHER | QSysInfo::MV_10_3
Qt::MV_PUMA | QSysInfo::MV_10_1
Qt::MV_TIGER | QSysInfo::MV_10_4
Qt::MV_Unknown | QSysInfo::MV_Unknown
Qt::MetaButton | Qt::MetaModifier
Qt::Minimized | Qt::DockMinimized
Qt::NoAccel | Qt::TextHideMnemonic
Qt::Overline | Qt::TextOverline
Qt::Right | Qt::DockRight
Qt::ShiftButton | Qt::ShiftModifier
Qt::ShowPrefix | Qt::TextShowMnemonic
Qt::SingleLine | Qt::TextSingleLine
Qt::StrikeOut | Qt::TextStrikeOut
Qt::Top | Qt::DockTop
Qt::TopLeft | Qt::TopLeftCorner
Qt::TopRight | Qt::TopRightCorner
Qt::TornOff | Qt::DockTornOff
Qt::Underline | Qt::TextUnderline
Qt::Unmanaged | Qt::DockUnmanaged
Qt::WNorthWestGravity | Qt::WStaticContents
Qt::WRepaintNoErase | Qt::WNoAutoErase
Qt::WStyle_Dialog | Qt::WType_Dialog
Qt::WStyle_NoBorderEx | Qt::WStyle_NoBorder
Qt::WType_Modal | (Qt::WType_Dialog | Qt::WShowModal)
Qt::WV_2000 | QSysInfo::WV_2000
Qt::WV_2003 | QSysInfo::WV_2003
Qt::WV_32s | QSysInfo::WV_32s
Qt::WV_95 | QSysInfo::WV_95
Qt::WV_98 | QSysInfo::WV_98
Qt::WV_CE | QSysInfo::WV_CE
Qt::WV_CENET | QSysInfo::WV_CENET
Qt::WV_CE_based | QSysInfo::WV_CE_based
Qt::WV_DOS_based | QSysInfo::WV_DOS_based
Qt::WV_Me | QSysInfo::WV_Me
Qt::WV_NT | QSysInfo::WV_NT
Qt::WV_NT_based | QSysInfo::WV_NT_based
Qt::WV_XP | QSysInfo::WV_XP
Qt::WordBreak | Qt::TextWordWrap
Qt::arrowCursor | Qt::ArrowCursor
Qt::blankCursor | Qt::BlankCursor
Qt::crossCursor | Qt::CrossCursor
Qt::forbiddenCursor | Qt::ForbiddenCursor
Qt::ibeamCursor | Qt::IbeamCursor
Qt::pointingHandCursor | Qt::PointingHandCursor
Qt::sizeAllCursor | Qt::SizeAllCursor
Qt::sizeBDiagCursor | Qt::SizeBDiagCursor
Qt::sizeFDiagCursor | Qt::SizeFDiagCursor
Qt::sizeHorCursor | Qt::SizeHorCursor
Qt::sizeVerCursor | Qt::SizeVerCursor
Qt::splitHCursor | Qt::SplitHCursor
Qt::splitVCursor | Qt::SplitVCursor
Qt::upArrowCursor | Qt::UpArrowCursor
Qt::waitCursor | Qt::WaitCursor
Qt::whatsThisCursor | Qt::WhatsThisCursor

In addition, the following window flags have been either replaced with widget attributes or have been deprecated:

Qt 3 type | Qt 4 equivalent
--- | ---
Qt::WDestructiveClose | Use QWidget::setAttribute(Qt::WA_DeleteOnClose) instead.
Qt::WStaticContents | Use QWidget::setAttribute(Qt::WA_StaticContents) instead.
Qt::WNorthWestGravity
Qt::WNoAutoErase | Use QWidget::setAttribute(Qt::WA_NoBackground) instead.
Qt::WResizeNoErase
Qt::WRepaintNoErase
Qt::WPaintClever | Unnecessary in Qt 4.
Qt::WMacNoSheet | Unnecessary in Qt 4.

## Properties

Some properties have been renamed in Qt 4, to make Qt's API more consistent and more intuitive. For example, QWidget's `caption` property has been renamed `windowTitle` to make it clear that it refers to the title shown in the window's title bar.

The table below lists the Qt properties that have been renamed in Qt 4. Occurrences of these in Qt Designer `.ui` files are automatically converted to the new name by `uic`.

Qt 3 name | Qt 4 name
--- | ---
QButton::accel | QButton::shortcut
QButton::on | QButton::checked
QButton::toggleButton | QAbstractButton::checkable
QDial::lineStep | QDial::singleStep
QDial::maxValue | QDial::maximum
QDial::minValue | QDial::minimum
QDialog::modal | QDialog::isModal
QLineEdit::edited | QLineEdit::modified
QLineEdit::hasMarkedText | QLineEdit::hasSelectedText
QLineEdit::markedText | QLineEdit::selectedText
QObject::name | QObject::objectName
QProgressDialog::progress | QProgressDialog::value
QProgressDialog::totalSteps | QProgressDialog::maximum
QProgressDialog::wasCancelled | QProgressDialog::wasCanceled
QPushButton::iconSet | QPushButton::icon
QScrollBar::draggingSlider | QScrollBar::sliderDown
QScrollBar::lineStep | QScrollBar::singleStep
QScrollBar::maxValue | QScrollBar::maximum
QScrollBar::minValue | QScrollBar::minimum
QSlider::lineStep | QSlider::singleStep
QSlider::maxValue | QSlider::maximum
QSlider::minValue | QSlider::minimum
QSpinBox::lineStep | QSpinBox::singleStep
QSpinBox::maxValue | QSpinBox::maximum
QSpinBox::minValue | QSpinBox::minimum
QTabBar::currentTab | QTabBar::currentIndex
QTabWidget::currentPage | QTabWidget::currentIndex
QToolButton::iconSet | QToolButton::icon
QToolButton::textLabel | QToolButton::text
QWidget::caption | QWidget::windowTitle
QWidget::icon | QWidget::windowIcon
QWidget::iconText | QWidget::windowIconText

A handful of properties in Qt 3 are no longer properties in Qt 4, but the access functions still exist as part of the Qt 4 API. These are not used by Qt Designer; the only case where you need to worry about them is in highly dynamic applications that use Qt's meta-object system to access properties. Here's the list of these properties with the read and write functions that you can use instead:

Qt 3 property | Qt 4 read function | Qt 4 write function
--- | --- | ---
QGrid::margin | QGridWidget::margin() | QGridWidget::setMargin()
QHBox::margin | QHBoxWidget::margin() | QHBoxWidget::setMargin()
QSqlDatabase::connectOptions | QSqlDatabase::connectOptions() | QSqlDatabase::setConnectOptions()
QSqlDatabase::databaseName | QSqlDatabase::databaseName() | QSqlDatabase::setDatabaseName()
QSqlDatabase::hostName | QSqlDatabase::hostName() | QSqlDatabase::setHostName()
QSqlDatabase::password | QSqlDatabase::password() | QSqlDatabase::setPassword()
QSqlDatabase::port | QSqlDatabase::port() | QSqlDatabase::setPort()
QSqlDatabase::userName | QSqlDatabase::userName() | QSqlDatabase::setUserName()

Some properties have been removed from Qt 4, but the associated access functions are provided if `QT_COMPAT` is defined to help porting to Qt 4. When converting Qt 3 `.ui` files to Qt 4, `uic` generates calls to the Qt compatibility functions.

The table below lists these properties with the read and write functions that you can use instead. The documentation for the individual functions explains how to replace them with non-compatibility Qt 4 functions.

Qt 3 property | Qt 4 read function (`QT_COMPAT`) | Qt 4 write function (`QT_COMPAT`)
--- | --- | ---
QMenuBar::separator | QMenuBar::separator() | QMenuBar::setSeparator()
QPushButton::menuButton | QPushButton::isMenuButton() | N/A
QTabWidget::margin | QTabWidget::margin() | QTabWidget::setMargin()
QWidget::backgroundBrush | QWidget::backgroundBrush() | N/A
QWidget::backgroundMode | QWidget::backgroundMode() | QWidget::setBackgroundMode()
QWidget::backgroundOrigin | QWidget::backgroundOrigin() | QWidget::setBackgroundOrigin()
QWidget::colorGroup | QWidget::colorGroup() | QWidget::setColorGroup()
QWidget::customWhatsThis | QWidget::customWhatsThis() | QWidget::setCustomWhatsThis()
QWidget::inputMethodEnabled | QWidget::inputMethodEnabled() | QWidget::setInputMethodEnabled()
QWidget::ownCursor | QWidget::ownCursor() | N/A
QWidget::ownFont | QWidget::ownFont() | N/A
QWidget::ownPalette | QWidget::ownPalette() | N/A
QWidget::paletteBackgroundColor | QWidget::paletteBackgroundColor() | QWidget::setPaletteBackgroundColor()
QWidget::paletteBackgroundPixmap | QWidget::paletteBackgroundPixmap() | QWidget::setPaletteBackgroundPixmap()
QWidget::paletteForegroundColor | QWidget::paletteForegroundColor() | QWidget::setPaletteForegroundColor()
QWidget::underMouse | QWidget::underMouse() | N/A

The following Qt 3 properties and their access functions are no longer available in Qt 4. In most cases, Qt 4 provides similar functionality.

Qt 3 property | Qt 4 equivalent
--- | ---
QButton::autoRepeat | N/A
QButton::autoResize | N/A
QButton::exclusiveToggle | See QButton::autoExclusive.
QButton::pixmap | Use QAbstractButton::icon instead.
QButton::toggleState | Use QCheckBox::setState() and QCheckBox::state() instead.
QButton::toggleType | Use QCheckBox::setTristate() instead.
QComboBox::autoResize | N/A
QFrame::contentsRect | Use Q3Frame::contentsRect() instead.
QFrame::contentsRect | Use Q3Frame::margin instead.
QTabBar::keyboardFocusTab | N/A
QToolButton::offIconSet | Use the off component of QAbstractButton::icon instead.
QToolButton::onIconSet | Use the on component of QAbstractButton::icon instead.
QWidget::microFocusHint | N/A

## Explicit Sharing

Qt 4 is the first version of Qt that contains no explicitly shared classes. All classes that were explicitly shared in Qt 3 are implicitly shared in Qt 4:

- QImage
- QMovie
- QBitArray
- QByteArray
- QPointArray

This means that if you took a copy of an instance of the class (using operator=() or the class's copy constructor), any modification to the copy would affect the original and vice versa. Needless to say, this behavior is rarely desirable.

Fortunately, nearly all Qt 3 applications don't rely on explicit sharing. When porting, you typically only need to remove calls to detach() and/or copy(), which aren't necessary anymore.

If you deliberately rely on explicit sharing in your application, you can use pointers or references to achieve the same result in Qt 4.

For example, if you have code like

        void asciify(QByteArray array)
        {
            for (int i = 0; i < (int)array.size(); ++i) {
                if ((uchar)array[i] >= 128)
                    array[i] = '?';
            }
        }

you can rewrite it as

        void asciify(QByteArray &array)
        {
            for (int i = 0; i < array.size(); ++i) {
                if ((uchar)array[i] >= 128)
                    array[i] = '?';
            }
        }

(Notice the `&` in the parameter declaration.)

## QAccel

The `QAccel` class has been renamed Q3Accel and moved to the Qt 3 compatibility library. In new applications, you have three options:

1. You can use QAction and set a key sequence using QAction::setShortcut().
2. You can use QShortcut, a class that provides similar functionality to Q3Accel.
3. You can use QWidget::grabShortcut() and process "shortcut" events by reimplementing QWidget::event().

The Q3Accel class also supports multiple accelerators using the same object, by calling Q3Accel::insertItem() multiple times. In Qt 4, the solution is to create multiple QShortcut objects.

## QAccessibleInterface

The QAccessibleInterface class has undergone some API changes in Qt 4, to make it more consistent with the rest of the Qt API.

If you have classes that inherit QAccessibleInterface or one of its subclasses (QAccessibleObject, QAccessibleWidget, etc.), you must port them the new QAccessibleInterface API.

See Virtual Functions for a list of QAccessibleInterface virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QAccessibleTitleBar

The `QAccessibleTitleBar` has been renamed Q3AccessibleTitleBar and moved to the Qt 3 compatibility library.

## QAction

The QAction class has been redesigned in Qt 4 to integrate better with the rest of the menu system. It unifies the old `QMenuItem` class and the old `QAction` class into one class, avoiding unnecessary data duplication and the need to learn two different APIs.

The old `QAction` and `QActionGroup` classes have been renamed Q3Action and Q3ActionGroup and moved to the Qt 3 compatibility library. In addition, the new QAction class has compatibility functions to ease transition to Qt 4.

See Virtual Functions for a list of QAction virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QActionGroup

The QAction class has been completely redesigned in Qt 4 to integrate better with the rest of the menu system. See the section on QAction for details.

## QApplication

The QApplication class has been split into two classes: QCoreApplication and QApplication. The new QApplication class inherits QCoreApplication and adds GUI-related functionality. In practice, this has no consequences for existing Qt applications.

In addition, the following API change was made:

1. QApplication::allWidgets() and QApplication::topLevelWidgets() used to return a pointer to a QWidgetList. Now they return a QWidgetList.

   Also, QWidgetList has changed from being a typedef for QPtrList<QWidget> to being a typedef for QList<QWidget *>. See the section on QWidgetList below for details.

   For example, if you have code like

               QWidgetList *list = QApplication::topLevelWidgets();
               QWidgetListIt it(*list);
               QWidget *widget;
               while ((widget = it.current())) {
                   if (widget->inherits("MainWindow"))
                       ((MainWindow *)widget)->updateRecentFileItems();
                   ++it;
               }
               delete list;

   you can rewrite it as

               QWidgetList list = QApplication::topLevelWidgets();
               for (int i = 0; i < list.size(); ++i) {
                   if (MainWindow *mainWin = qt_cast<MainWindow>(list.at(i)))
                       mainWin->updateRecentFileItems();
               }

## QAquaStyle

The `QAquaStyle` class first appeared in Qt 3.0, when the Qt/Mac port was first released. It emulated Apple's "Aqua" theme. In Qt 3.1, QAquaStyle was obsoleted by QMacStyle, which uses Appearance Manager to perform its drawing.

The `QAquaStyle` class is no longer provided in Qt 4. Use QMacStyle instead.

## QAsciiCache<T>

`QAsciiCache<T>` has been renamed Q3AsciiCache<T> and moved to the Qt 3 compatibility library. It has been replaced by QCache<QByteArray, T>.

For details, read the section on QCache<T>, mentally substituting QByteArray for QString.

## QAsciiDict<T>

QAsciiDict<T> and QAsciiDictIterator<T> have been renamed Q3AsciiDict<T> and Q3AsciiDictIterator<T> and moved to the Qt 3 compatibility library. They have been replaced by the more modern QHash<Key, T> and QMultiHash<Key, T> classes and their associated iterator classes.

When porting old code that uses Q3AsciiDict<T> to Qt 4, there are four classes that you can use:

- QMultiHash<QByteArray, T *>
- QMultiHash<QByteArray, T *>
- QHash<QByteArray, T>
- QHash<QByteArray, T>

For details, read the section on QDict<T>, mentally substituting QByteArray for QString.

## QAsyncIO

The `QAsyncIO` class was used internally in Qt 2.x in conjunction with QImageConsumer. It was obsoleted in Qt 3.0. If you use this mechanism in your application, contact qt-bugs@trolltech.com and we will try to find a satisfying substitute.

## QBackInsertIterator

The undocumented `QBackInsertIterator` class has been removed from the Qt library. If you need it in your application, feel free to copy the source code from the Qt 3 `<qtl.h>` header file.

## QBitArray

In Qt 3, QBitArray inherited from QByteArray. In Qt 4, QBitArray is a totally independent class. This makes very little difference to the user, except that the new QBitArray doesn't provide any of QByteArray's byte-based API anymore. These calls will result in a compile-time error, except calls to QBitArray::truncate(), whose parameter was a number of bytes in Qt 3 and a number of bits in Qt 4.

QBitArray was an explicitly shared class in Qt 3. See Explicit Sharing for more information.

The `QBitVal` class has been renamed QBitRef.

## QButton

The `QButton` class has been replaced by QAbstractButton in Qt 4. Classes like QPushButton and QRadioButton inherit from QAbstractButton. As a help when porting older Qt applications, the Qt 3 compatibility library contains a Q3Button class implemented in terms of the new QAbstractButton.

If you used the `QButton` class as a base class for your own button type and want to port your code to the newer QAbstractButton, you need to be aware that QAbstractButton has no equivalent for the Q3Button::drawButton(QPainter *) virtual function. The solution is to reimplement QWidget::paintEvent() in your QAbstractButton subclass as follows:

        void MyButton::paintEvent(QPaintEvent *)
        {
            QPainter painter(this);
            drawButton(&painter);
        }

Q3Button function | QAbstractButton equivalent
--- | ---
Q3Button::autoResize() | N/A
Q3Button::isExclusiveToggle() | Use QAbstractButton::group() or QAbstractButton::autoExclusive() instead.
Q3Button::pixmap() const | QAbstractButton::icon()
Q3Button::setAutoResize() | N/A
Q3Button::setPixmap(const QPixmap &) | QAbstractButton::setIcon(const QIcon &)
Q3Button::setState(ToggleState) | See remark below
Q3Button::setToggleType(ToggleType) | See remark below
Q3Button::state() | See remark below
Q3Button::stateChanged(int) | See remark below
Q3Button::toggleType() | See remark below

Remarks:

1. In Qt 3, `QButton` had a "toggle type", which could be QButton::SingleShot, QButton::Toggle, or QButton::Tristate. The new QAbstractButton class doesn't support "tristate" directly; this feature is implemented in QCheckBox instead. The two other "toggle types" (`QButton::SingleShot` and `QButton::Toggle`) are replaced by a QAbstractButton::checkable property.
2. In Qt 3, QButton had a "toggle state", which could be `QButton::Off`, `QButton::NoChange`, or `QButton::On`. In Qt 4, this mechanism has been moved to QCheckBox.

See Virtual Functions for a list of `QButton` virtual member functions in Qt 3 that aren't virtual in Qt 4.

See Properties for a list of `QButton` properties in Qt 3 that have changed in Qt 4.

## QButtonGroup

The `QButtonGroup` class has been completely redesigned in Qt 4. For compatibility, the old `QButtonGroup` class has been renamed Q3ButtonGroup and has been moved to the Qt 3 compatibility library. Likewise, the `QHButtonGroup` and `QVButtonGroup` convenience subclasses have been renamed `Q3HButtonGroup` and `Q3VButtonGroup` and moved to the Qt 3 compatibility library.

The old `QButtonGroup`, as well as Q3ButtonGroup, can be used in two ways:

1. The button group is the parent widget of a number of buttons, i.e. the button group is the parent argument in the button constructor. The buttons are assigned identifiers 0, 1, 2, etc., in the order they are created. A Q3ButtonGroup can display a frame and a title because it inherits Q3GroupBox.
2. The button group is an invisible widget and the contained buttons have some other parent widget. In this usage, each button must be manually inserted, using Q3ButtonGroup::insert(), into the button group and given an ID number.

Unlike Q3ButtonGroup, the new QButtonGroup doesn't inherit QWidget. It is very similar to a "hidden Q3ButtonGroup".

If you use a Q3ButtonGroup, Q3HButtonGroup, or Q3VButtonGroup as a widget and want to port to Qt 4, you can replace it with QGroupBox. In Qt 4, radio buttons with the same parent are automatically part of an exclusive group, so you normally don't need to do anything else. See also the section on QGroupBox below.

See Virtual Functions for a list of QButtonGroup virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QByteArray

In Qt 3, QByteArray was simply a typedef for QMemArray<char>. In Qt 4, QByteArray is a class in its own right, with a higher-level API in the style of QString.

Here are the main issues to be aware of when porting to Qt 4:

1. The QMemArray(int size) constructor has been replaced with QByteArray(int size, char ch). The second argument specifies which character should be used for initializing the array; pass '\0' if you have no specific needs.

   For example, if you have code like

           QByteArray ba(64);

   you can rewrite it as

           QByteArray ba(64, '\0');

2. QMemArray::at() returned a non-const reference, whereas the new QByteArray::at() returns a const value. Code like

           ba.at(0) = 'X';

   will no longer compile. Instead, use QByteArray::operator[]:

           ba[0] = 'X';

3. The QMemArray::contains(char) function has been renamed QByteArray::count(char). In addition, there now exists a QByteArray::contains(char) function that returns a boolean value. Replace old calls to contains() with either count() or contains(), depending on whether you care about the specific number of occurrences of a character in the byte array or only care about whether the array contains that character or not.
4. The new QByteArray has no assign() function. Calls to QMemArray::assign(const QMemArray &) can be replaced by calls to QByteArray::operator=(). Calls to QMemArray::assign(const T *, uint) have no equivalent in Qt 4; if you use it, the solution is either to use QByteArray::fromRawData() and to call free() yourself to avoid a memory leak, or to use the QByteArray(const char *, int) constructor, which will take a deep copy of the data.
5. QMemArray::bsearch() and QMemArray::sort() have no equivalent in the new QByteArray class. Use qBinaryFind() and qHeapSort() if you need that functionality.

QByteArray was an explicitly shared class in Qt 3. See Explicit Sharing for more information.

## QCache<T>

QCache<T> has been renamed Q3Cache<T> and moved to the Qt 3 compatibility library. The new QCache class has a different API, and takes different template parameters: QCache<Key, T>.

When porting to Qt 4, QCache<QString, T> is the obvious substitute for Q3Cache<T>. The following table summarizes the API differences.

Q3Cache<T> function | QCache<QString, T> equivalent
--- | ---
Q3Cache::Q3Cache(int maxCost, int size, bool caseSensitive) | See remark below
Q3Cache::autoDelete() | N/A
Q3Cache::count() | QCache::count() or QCache::size() (equivalent)
Q3Cache::setAutoDelete() | See remark below
Q3Cache::size() | N/A
Q3Cache::statistics() | N/A
Q3Cache::operator=() | See remark below

Remarks:

1. Q3Cache requires the user to allocate a specific number of buckets by passing a prime number (17 by default) to the constructor. In contrast, the new QCache's hash table automatically grows and shrinks as needed, and the constructor doesn't take a prime number.
2. Q3Cache supportes case-insensitive lookups by passing false as second argument to the constructor. This feature has no equivalent in QMultiHash. Instead, call QString::toLower() before you insert or lookup a key in the hash.
3. The Q3Cache::insert() function returns a `bool` value that indicates whether or not the item actually was inserted in the cache. If the item wasn't inserted, it was the caller's responsibility to delete the item. The new QCache::insert() function returns `void` and either adds it to the cache or deletes it right away. Old code like

           if (!cache.insert(key, object))
               delete object;

   becomes

           cache.insert(key, object);

4. The new QCache class always takes ownership of the items it stores (i.e. auto-delete is always on). If you use Q3Cache with auto-delete turned off (the rarely useful default), you cannot use QCache as a direct substitute. One unelegant trick that works well in practice is to use QCache<QString, T *> instead of QCache<QString, T>. In that case, QCache owns the pointers, not the objects that the pointers refer to. For example,

               Q3Cache<QWidget> cache;
               cache.insert(widget->name(), widget);
               ...
               QWidget *foo = cache.take("foo");
               if (foo)
                   foo->show();

   becomes

               typedef QWidget *QWidgetPtr;
               QCache<QString, QWidgetPtr> cache;
               cache.insert(widget->name(), new QWidgetPtr(widget));
               ...
               QWidgetPtr *ptr = cache.take("foo");
               if (ptr) {
                   QWidget *foo = *ptr;
                   delete ptr;
                   foo->show();
               }

   An alternative is to stick to using Q3Cache.

QCacheIterator<T> has been renamed Q3CacheIterator<T> and moved to the Qt 3 compatibility library. The new QCache class doesn't offer any iterator types.

## QCanvas

The canvas module classes have been renamed and moved to the Qt 3 compatibility library.

Qt 3 class name | Compatibility class in Qt 4
--- | ---
`QCanvas` | Q3Canvas
`QCanvasEllipse` | Q3CanvasEllipse
`QCanvasItem` | Q3CanvasItem
`QCanvasItemList` | Q3CanvasItemList
`QCanvasLine` | Q3CanvasLine
`QCanvasPixmap` | Q3CanvasPixmap
`QCanvasPixmapArray` | Q3CanvasPixmapArray
`QCanvasPolygon` | Q3CanvasPolygon
`QCanvasPolygonalItem` | Q3CanvasPolygonalItem
`QCanvasRectangle` | Q3CanvasRectangle
`QCanvasSpline` | Q3CanvasSpline
`QCanvasSprite` | Q3CanvasSprite
`QCanvasText` | Q3CanvasText
`QCanvasView` | Q3CanvasView

Qt 4.1 is expected to provide a replacement module for these classes, based on Qt 4's powerful new 2D paint system.

## QColorGroup

In Qt 3, a QPalette consisted of three QColorGroup objects. In Qt 4, the (rarely used) QColorGroup abstraction has been eliminated. For source compatibility, a QColorGroup class is available when `QT_COMPAT` is defined.

The new QPalette still works in terms of color groups, specified through enum values (QPalette::Active, QPalette::Disabled, and QPalette::Inactive). It also has the concept of a current color group, which you can set using QPalette::setCurrentColorGroup().

The QPalette object returned by QWidget::palette() returns a QPalette initialized with the correct current color group for the widget. This means that if you had code like

        painter.setBrush(colorGroup().brush(QColorGroup::Background));

you can simply replace colorGroup() with palette():

        painter.setBrush(palette().brush(QColorGroup::Background));

## QColorDrag

The `QColorDrag` class has been renamed Q3ColorDrag and moved to the Qt 3 compatibility library. In Qt 4, use QMimeData instead and call QMimeData::setColor() to set the color.

## QComboBox

See Virtual Functions for a list of QComboBox virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QCString

In Qt 3, QCString inherited from QByteArray. The main drawback of this approach is that the user had the responsibility of ensuring that the string is '\0'-terminated. Another important issue was that conversions between `QCString` and QByteArray often gave confusing results. (See the Achtung! Binary and Character Data article in Qt Quarterly for an overview of the pitfalls.)

Qt 4 solves that problem by merging the QByteArray and `QCString` classes into one class called QByteArray. Most functions that were in `QCString` previously have been moved to QByteArray. The '\0' issue is handled by having QByteArray allocate one extra byte that it always sets to '\0'. For example:

        QByteArray ba("Hello");
        ba.size();             // returns 5 (the '\0' is not counted)
        ba.length();           // returns 5
        ba.data()[5];          // returns '\0'

The Qt 3 compatibility library contains a class called Q3CString that inherits from the new QByteArray class and that extends it to provide an API that is as close to the old `QCString` class as possible. Note that the following functions aren't provided by the compatibility Q3CString class:

- QCString::find(const QRegExp &, int)
- QCString::findRev(const QRegExp &, int)
- QCString::contains(const QRegExp &)
- QCString::replace(const QRegExp &, const char *)

The following functions have lost their last parameter, which specified whether the search was case sensitive or not:

- QByteArray::find(char, int)
- QByteArray::find(const char *, int)
- QByteArray::findRev(char, int)
- QByteArray::findRev(const char *, int)
- QByteArray::contains(char)
- QByteArray::contains(const char *)

In both cases, the solution is to convert the `QCString` to a QString and use the corresponding QString functions instead.

Also be aware that `QCString::size()` (inherited from QByteArray) used to return the size of the character data including the '\0'-terminator, whereas the new QByteArray::size() is just a synonym for QByteArray::length(). This brings QByteArray in line with QString.

When porting to Qt 4, occurrences of `QCString` should be replaced with QByteArray or QString. The following table summarizes the API differences between the `Q3CString` compatibility class and the Qt 4 QByteArray and QString classes:

Q3CString function | Qt 4 equivalent
--- | ---
Q3CString::Q3CString(const char *, uint) | See remark below
Q3CString::Q3CString(int) | QByteArray::QByteArray(int, char)
Q3CString::leftJustify() | QString::leftJustified()
Q3CString::length() | QByteArray::length() or QByteArray::size() (equivalent)
Q3CString::lower() | QByteArray::toLower()
Q3CString::rightJustify() | QString::rightJustified()
Q3CString::setExpand() | See remark below
Q3CString::simplifyWhiteSpace() | QByteArray::simplified()
Q3CString::sprintf() | QString::sprintf()
Q3CString::stripWhiteSpace() | QByteArray::trimmed()
Q3CString::toDouble() | QString::toDouble()
Q3CString::toFloat() | QString::toFloat()
Q3CString::toInt() | QString::toInt()
Q3CString::toLong() | QString::toLong()
Q3CString::toShort() | QString::toShort()
Q3CString::toUInt() | QString::toUInt()
Q3CString::toULong() | QString::toULong()
Q3CString::toUShort() | QString::toUShort()
Q3CString::upper() | QByteArray::toUpper()

Remarks:

1. Q3CString(const char *str, uint max) constructs a string of length strlen(str) or max - 1, whichever is shorter. QByteArray(const char *data, int size) constructs a byte array containing exactly size bytes.

   For example, if you have code like

               QCString str1("Hello", 4);           // "Hel"
               QCString str2("Hello world!", n);

   you can rewrite it as

               QByteArray str1("Hello", 3);
               QByteArray str2("Hello world!");
               str2.truncate(n - 1);

2. Q3CString::setExpand(uint index, char ch) has no equivalent in Qt 4.

   For example, if you have code like

               QCString str("Hello world");
               str.setExpand(16, '\n');            // "Hello world     \n"

   you can rewrite it as

               QByteArray str("Hello world");
               while (str.size() < 16)
                   str += ' ';
               str += '\n';

Since the old `QCString` class inherited from QByteArray, everything that is said in the QByteArray section applies for `QCString` as well.

## QDataBrowser

The `QDataBrowser` class has been renamed Q3DataBrowser and moved to the Qt 3 compatibility library. It is expected that Qt 4.1 will offer a replacement class. In the meantime, you can use Q3DataBrowser for creating data-aware forms or you can roll your own.

See SQL Module for an overview of the new SQL classes.

## QDataPump

The `QDataPump` class was used internally in Qt 2.x in conjunction with QImageConsumer. It was obsoleted in Qt 3.0. If you use this mechanism in your application, contact qt-bugs@trolltech.com and we will try to find a satisfying substitute.

## QDataSink

The `QDataSink` class was used internally in Qt 2.x in conjunction with QImageConsumer. It was obsoleted in Qt 3.0. If you use this mechanism in your application, contact qt-bugs@trolltech.com and we will try to find a satisfying substitute.

## QDataSource

The `QDataSource` class was used internally in Qt 2.x in conjunction with QImageConsumer. It was obsoleted in Qt 3.0. If you use this mechanism in your application, contact qt-bugs@trolltech.com and we will try to find a satisfying substitute.

## QDataTable

The `QDataTable` class has been renamed Q3DataTable and moved to the Qt 3 compatibility library. It is expected that Qt 4.1 will offer a replacement class. In the meantime, you can use Q3DataTable for creating data-aware forms or you can roll your own.

See SQL Module for an overview of the new SQL classes.

## QDataView

The `QDataView` class has been renamed Q3DataView and moved to the Qt 3 compatibility library. It is expected that Qt 4.1 will offer a replacement class. In the meantime, you can use Q3DataTable for creating data-aware forms or you can roll your own.

See SQL Module for an overview of the new SQL classes.

## QDateEdit

The `QDateEdit` class has been renamed Q3DateEdit and moved to the Qt 3 compatibility library. Use QDateTimeEdit instead.

See Virtual Functions for a list of `QDateEdit` virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QDateTimeEditBase

The `QDateTimeEditBase` class has been renamed Q3DateTimeEditBase and moved to the Qt 3 compatibility library. Use QDateTimeEdit or QAbstractSpinBox instead.

## QDateTimeEdit

The old `QDateTimeEdit` class has been renamed Q3DateTimeEditBase and moved to the Qt 3 compatibility library. The new QDateTimeEdit in Qt 4 has been rewritten from scratch to provide a more flexible and powerful API.

See Virtual Functions for a list of QDateTimeEdit virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QDeepCopy<T>

The `QDeepCopy<T>` class in Qt 3 provided a means of ensuring that implicitly shared and explicitly shared classes referenced unique data. This was necessary because the reference counting in Qt's container classes was done in a thread-unsafe manner.

With Qt 4, `QDeepCopy<T>` has been renamed Q3DeepCopy<T> and moved to the Qt 3 compatibility library. Removing it from existing code is straightforward.

For example, if you have code like

        QString str1 = "I am a string";
        QDeepCopy<QString> str2 = str1;
        QString str3 = QDeepCopy<QString>(str2);

you can rewrite it as

        QString str1 = "I am a string";
        QString str2 = str1;
        QString str3 = str2;

## QDial

See Virtual Functions for a list of QComboBox virtual member functions in Qt 3 that are no longer virtual in Qt 4.

See Properties for a list of QDial properties in Qt 3 that have changed in Qt 4.

## QDict<T>

`QDict<T>` has been renamed Q3Dict<T> and moved to the Qt 3 compatibility library. It has been replaced by the more modern QHash<Key, T> and QMultiHash<Key, T> classes.

When porting old code that uses QDict<T> to Qt 4, there are four classes that you can use:

Qt 4 class | When to use it
--- | ---
QMultiHash<QString, T *> | Since Q3Dict<T> is pointer-based and allows duplicate keys, this is usually the most straightforward conversion.
QMultiHash<QString, T> | If type `T` is an assignable data type, you can use `T` as the value type rather than `T *`. This often leads to nicer code.
QHash<QString, T *> | If you don't use duplicate keys, you can use QHash instead of QMultiHash. QMultiHash inherits from QHash.
QHash<QString, T>

The APIs of Q3Dict<T> and QMultiHash<QString, T *> are quite similar. The main issue is that Q3Dict supports auto-delete whereas QMultiHash doesn't.

The following table summarizes the API differences between the two classes:

Q3Dict function | QMultiHash equivalent
--- | ---
Q3Dict::Q3Dict(int size, bool caseSensitive) | See remarks below
Q3Dict::autoDelete() | N/A
Q3Dict::count() | QMultiHash::count() or QMultiHash::size() (equivalent)
Q3Dict::find(const QString &) | QMultiHash::value(const QString &)
Q3Dict::remove(const QString &) | QMultiHash::take(const QString &)
Q3Dict::resize(uint) | QMultiHash::reserve(int)
Q3Dict::setAutoDelete() | See discussion below
Q3Dict::size() | QMultiHash::capacity()
Q3Dict::statistics() | N/A
Q3Dict::operator[](const QString &) | See remark below

Remarks:

1. Q3Dict requires the user to allocate a specific number of buckets by passing a prime number (17 by default) to the constructor and/or calling Q3Dict::resize() later on. In contrast, QMultiHash's hash table automatically grows and shrinks as needed, and the constructor doesn't take a prime number.
2. Q3Dict supportes case-insensitive lookups by passing false as second argument to the constructor. This feature has no equivalent in QMultiHash. Instead, call QString::toLower() before you insert or lookup a key in the hash.
3. Q3Dict::size() and QMultiHash::size() have different semantics. The former returns the number of buckets in the container, whereas the latter returns the number of items in the container.
4. If there are multiple items with the same key, Q3Dict::remove() removes only the most recently inserted item, whereas QMultiHash::remove() removes all items that share a particular key. To remove only the most recently inserted item, call QMultiHash::take().
5. Q3Dict has only one [] operator (Q3Dict::operator[]()), providing const access to an item's value. QMultiHash also has a non-const overload that can be used on the left side of the assignment operator. If you use the [] operator on a non-const QHash with an unexisting item, QHash will created an element and initialize it to be a null pointer. For that reason, Q3Dict::operator[] should be converted to QMultiHash::value(), not QMultiHash::operator[].

If you use Q3Dict's auto-delete feature (by calling Q3Dict::setAutoDelete(true)), you need to do some more work. You have two options: Either you call `delete` yourself whenever you remove an item from the container, or you use QMultiHash<QString, T> instead of QMultiHash<QString, T *> (i.e. store values directly instead of pointers to values). Here, we'll see when to call `delete`.

The following table summarizes the idioms that you need to watch out for if you want to call `delete` yourself.

Q3Dict idiom | QMultiHash idiom
--- | ---

        dict.replace(key, value);

        delete hash.take(key);
        hash.insert(key, value);

        dict.remove(key, value);

        delete hash.take(key);

        dict.clear();

(also called from Q3Dict's destructor)

        while (!hash.isEmpty()) {
            T *value = *hash.begin();
            dict.erase(hash.begin());
            delete value;
        }

In 99% of cases, the following idiom also works:

        qDeleteAll(hash);
        hash.clear();

However, it may lead to crashes if `hash` is referenced from the value type's destructor, because `hash` contains dangling pointers until clear() is called.

Be aware that Q3Dict's destructor automatically calls clear(). If you have a Q3Dict data member in a custom class and use the auto-delete feature, you will need to call `delete` on all the items in the container from your class destructor to avoid a memory leak.

Finally, `QDictIterator<T>` (renamed Q3DictIterator<T>) must also be ported. There are no fewer than four iterator classes that can be used as a replacement: QHash::const_iterator, QHash::iterator, QHashIterator, and QHashMutableIterator. The most straightforward class to use when porting is QHashIterator<QString, T *>. The following table summarizes the API differences:

Q3DictIterator functions | Qt 4 equivalent
--- | ---
Q3DictIterator::count() | QHash::count() or QHash::size()
Q3DictIterator::current() | QHashIterator::value()
Q3DictIterator::currentKey() | QHashIterator::key()
Q3DictIterator::isEmpty() | QHash::isEmpty()
Q3DictIterator::toFirst() | QHashIterator::toFront()
Q3DictIterator::operator()() | QHashIterator::value()
Q3DictIterator::operator*() | QHashIterator::value()
Q3DictIterator::operator++() | See remark below

Be aware that QHashIterator has a different way of iterating than Q3DictIterator. A typical loop with Q3DictIterator looks like this:

        Q3DictIterator<QWidget> i(dict);
        while (i.current() != 0) {
            do_something(i.currentKey(), i.current());
            ++i;
        }

Here's the equivalent QHashIterator loop:

        QHashIterator<QString, QWidget *> i(hash);
        while (i.hasNext()) {
            i.next();                   // must come first
            do_something(i.key(), i.value());
        }

See Java-style iterators for details.

## QDir

The following functions used to have a boolean `acceptAbsPath` parameter that defaulted to true:

- QDir::filePath()
- QDir::absFilePath()
- QDir::cd()
- QDir::mkdir()
- QDir::rmdir()
- QDir::remove()
- QDir::rename()
- QDir::exists()

In Qt 3, if `acceptAbsPath` is true, a file name starting with '/' is be returned without change; if `acceptAbsPath` is false, an absolute path is prepended to the file name. For example:

Current directory | File name | `acceptAbsPath` | File path
--- | --- | --- | ---
/home/tsmith | index.html | true | /home/tsmith/index.html
false | /home/tsmith/index.html
/home/tsmith | /index.html | true | /index.html
false | /home/tsmith/index.html

In Qt 4, this parameter is no longer available. If you use it in your code, you can check that QDir::isRelativePath() returns false instead.

For example, if you have code like

        QDir dir("/home/tsmith");
        QString path = dir.filePath(fileName, false);

you can rewrite it as

        QDir dir("/home/tsmith");
        QString path;
        if (dir.isRelativePath(fileName))
            path = dir.filePath(fileName);
        else
            path = fileName;

QDir::encodedEntryList() has been removed.

fileInfoList() and drives() now return a QList<QFileInfo> and not a QPtrList<QFileInfo> *. Code using these methods will have to be adapted.

See Virtual Functions for a list of QDir virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QDns

Qt 3 used its own implementation of the DNS protocol and provided a low-level `QDns` class. Qt 4 uses the system's `gethostbyname()` function from a thread instead.

The old `QDns` class has been renamed Q3Dns and moved to the Qt 3 compatibility library. The new QDns class has a radically different API: It consists mainly of two static functions, both called QDns::getHostByName(), one of which is blocking, the other non-blocking. See the QDns class documentation for details.

## QDockArea

The `QDockArea` class has been renamed Q3DockArea and moved to the Qt 3 compatibility library. In Qt 4, QMainWindow handles the dock and toolbar areas itself. See the QMainWindow documentation for details.

## QDockWindow

The old `QDockWindow` class has been renamed Q3DockWindow and moved to the Qt 3 compatibility library. In Qt 4, there is a new QDockWindow class with a different API. See the class documentation for details.

See Virtual Functions for a list of QDockWindow virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QDragObject

The `QDragObject` class has been renamed Q3DragObject and moved to the Qt 3 compatibility library. In Qt 4, it has been replaced by the QMimeData class. See the class documentation for details.

## QDropSite

The `QDropSite` class has been renamed Q3DropSite and moved to the Qt 3 compatibility library.

The QDropSite class has been obsolete ever since Qt 2.0. The only thing it does is call QWidget::setAcceptDrops(true).

For example, if you have code like

        class MyWidget : public QWidget, public QDropSite
        {
        public:
            MyWidget(const QWidget *parent)
                : QWidget(parent), QDropSite(this)
            {
            }
            ...
        }

you can rewrite it as

        class MyWidget : public QWidget
        {
        public:
            MyWidget(const QWidget *parent)
                : QWidget(parent)
            {
                setAcceptDrops(true);
            }
            ...
        }

## QEditorFactory

The `QEditorFactory` class has been renamed Q3EditorFactory and moved to the Qt 3 compatibility library.

See SQL Module for an overview of the new SQL classes.

## QEventLoop

In Qt 3, `QEventLoop` combined the Qt event loop and the event dispatching. In Qt 4, these tasks are now assigned to two distinct classes: QEventLoop and QAbstractEventDispatcher.

If you subclassed QEventLoop to integrate with another library's event loop, you will now need to subclass QAbstractEventDispatcher instead. See the class documentation for details.

## QFileDialog

The QFileDialog class in Qt 4 has been totally rewritten. It provides most of the functionality of the old `QFileDialog` class, but with a different API. Some functionality, such as the ability to preview files, is expected to be added in a later Qt 4 release.

The old `QFileDialog`, `QFileIconProvider`, and `QFilePreview` classes has been renamed Q3FileDialog, Q3FileIconProvider, and Q3FilePreview and have been moved to the Qt 3 compatibility library. You can use them if you need some functionality not provided yet by the new QFileDialog class.

The following table lists which functions have been renamed or removed in Qt 4.

Old function | Qt 4 equivalent
--- | ---
Q3FileDialog::addFilter(const QString &) | See remark below
Q3FileDialog::addLeftWidget(QWidget *) | N/A
Q3FileDialog::addRightWidget(QWidget *) | N/A
Q3FileDialog::addToolButton(QAbstractButton *, bool separator) | N/A
Q3FileDialog::addWidgets(QLabel *, QWidget *, QPushButton *) | N/A
Q3FileDialog::dir() | QFileDialog::directory()
Q3FileDialog::dirPath() | QFileDialog::directory().path()
Q3FileDialog::iconProvider() | N/A
Q3FileDialog::isContentsPreviewEnabled() | N/A
Q3FileDialog::isInfoPreviewEnabled() | N/A
Q3FileDialog::previewMode() | N/A
Q3FileDialog::rereadDir() | N/A
Q3FileDialog::resortDir() | N/A
Q3FileDialog::selectAll(bool) | N/A
Q3FileDialog::setContentsPreview(QWidget *, Q3FilePreview *) | N/A
Q3FileDialog::setContentsPreviewEnabled(bool) | N/A
Q3FileDialog::setDir(const QString &) | QFileDialog::setDirectory(const QString &)
Q3FileDialog::setFilters(const char **) | Q3FileDialog::setFilters(const QStringList &)
Q3FileDialog::setIconProvider(Q3FileIconProvider *) | N/A
Q3FileDialog::setInfoPreview(QWidget *, Q3FilePreview *) | N/A
Q3FileDialog::setInfoPreviewEnabled(bool) | N/A
Q3FileDialog::setPreviewMode(PreviewMode) | N/A
Q3FileDialog::setSelectedFilter(const QString &) | QFileDialog::selectFilter(const QString &)
Q3FileDialog::setSelectedFilter(int) | See remark below
Q3FileDialog::setSelection(const QString &) | QFileDialog::selectFile(const QString &)
Q3FileDialog::setShowHiddenFiles(bool) | showHidden()
Q3FileDialog::setUrl(const QUrlOperator &) | N/A
Q3FileDialog::showHiddenFiles() | N/A
Q3FileDialog::url() | QUrl::fromLocalFile(QFileDialog::directory())
Old signals | Qt 4 equivalent
Q3FileDialog::fileHighlighted(const QString &) | N/A
Q3FileDialog::fileSelected(const QString &) | QFileDialog::filesSelected(const QStringList &)
Q3FileDialog::dirEntered(const QString &) | N/A
Q3FileDialog::filterSelected(const QString &) | N/A

Remarks:

1. The Q3FileDialog::addFilter(const QString &) function has no direct equivalent in the new QFileDialog. Use QFileDialog::setFilters() instead.

   For example, if you have code like

               fileDialog->addFilter(tr("JPEG files (*.jpg *.jpeg)"));

   you can rewrite it as

               QStringList filters = fileDialog->filters();
               filters << tr("JPEG files (*.jpg *.jpeg)");
               fileDialog->setFilters(filters);

2. The Q3FileDialog::setSelectedFilter(int) overload has no direct equivalent in the new QFileDialog. Use QFileDialog::selectFilter(const QString &) instead.

   For example, if you have code like

               fileDialog->setSelectedFilter(3);

   you can rewrite it as

               fileDialog->selectFilter(fileDialog->filters().at(3));

See Virtual Functions for a list of QFileDialog virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QFrame

The QFrame class has been made more lightweight in Qt 4, by reducing the number of properties and virtual functions. The reduction in the number of virtual functions is significant because QFrame is the base class of many Qt classes.

Here's an overview of the changes:

- QFrame no longer has a `margin` property (which wasn't honored by Qt's layout managers anyway).
- QFrame used to have drawFrame(QPainter *), drawContents(QPainter *), and frameChanged() virtual functions. These are now gone. If you want to change the way QFrame paints itself, reimplement QFrame:paintEvent().

As an help to porting, the Qt 3 compatibility library contains a Q3Frame class that inherits QFrame and provides a similar API to the old QFrame class. If you derived from QFrame in your application, you might want to use Q3Frame as a base class as a first step in the porting process, and later move on to the new QFrame class.

See Virtual Functions for a list of QFrame virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QFtp

QFtp no longer inherits from QNetworkProtocol. See the section on QNetworkProtocol for details.

The old `QFtp` class has been renamed Q3Ftp and moved to the Qt 3 compatibility library.

## QGLayoutIterator

The QGLayoutIterator class no longer exists in Qt 4. This makes only a difference if you implemented custom layout managers (i.e., QLayout subclasses).

The new approach is much simpler: It consists in reimplementing QLayout::itemAt() and QLayout::takeAt(). These functions operate on indexes, eliminating the need for a layout iterator class.

## QGrid

The QGrid class has been renamed QGridWidget.

## QGridLayout

See Virtual Functions for a list of QGridLayout virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QGridView

The `QGridView` class has been renamed Q3GridView and moved to the Qt 3 compatibility library. In Qt 4, we recommend that you use QTableView or QAbstractItemView for presenting tabular data.

See Model/View Programming for an overview of the new item view classes.

## QGroupBox

The QGroupBox class has been redesigned in Qt 4. The old `QGroupBox` class has been renamed Q3GroupBox and moved to the Qt 3 compatibility library.

The new QGroupBox is more lightweight. It doesn't attempt to duplicate functionality already provided by QGridLayout. For that reason, the following members have been removed:

- Q3GroupBox::setColumns(), Q3GroupBox::columns()
- Q3GroupBox::setOrientation(), Q3GroupBox::orientation()
- Q3GroupBox::setInsideMargin(), Q3GroupBox::insideMargin()
- Q3GroupBox::addSpace()

Naturally, the `columns` and `orientation` properties have also been removed.

If you rely on some of the missing functionality in your application, you can use Q3GroupBox instead of QGroupBox as a help to porting.

See Virtual Functions for a list of QGroupBox virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QHBox

The QHBox class has been renamed QHBoxWidget.

## QHeader

The `QHeader` class has been renamed Q3Header and moved to the Qt 3 compatibility library. In Qt 4, it is replaced by the QHeaderView class.

See Model/View Programming for an overview of the new item view classes.

## QHttp

QHttp no longer inherits from QNetworkProtocol. See the See the section on QNetworkProtocol for details.

The old `QHttp`, `QHttpHeader`, `QHttpRequestHeader`, and `QHttpResponseHeader` classes have been renamed Q3Http, Q3HttpHeader, Q3HttpRequestHeader, and Q3HttpResponseHeader and have been moved to the Qt 3 compatibility library.

## QIconFactory

The QIconFactory is no longer part of Qt. It has been replaced by a lighter mechanism based on function pointers and a QVariant arbitrary parameter.

To port old code that uses QIconFactory to Qt 4, you generally need to turn your QIconFactory::createPixmap() reimplementation into a regular function and call QIcon::setPixmapGeneratorFn() or QIcon::setDefaultPixmapGeneratorFn() on it.

## QIconView

The `QIconView`, `QIconViewItem`, `QIconDrag`, and `QIconDragItem` classes has been renamed Q3IconView, Q3IconViewItem, Q3IconDrag, and Q3IconDragItem and moved to the Qt 3 compatibility library. New Qt applications should use QListWidget or its base class QListView instead, and call QListView::setViewMode(QListView::IconMode) to obtain an "icon view" look.

See Model/View Programming for an overview of the new item view classes.

## QImageDrag

The `QImageDrag` class has been renamed Q3ImageDrag and moved to the Qt 3 compatibility library. In Qt 4, use QMimeData instead and call QMimeData::setImage() to set the image.

## QIntCache<T>

QIntCache<T> has been moved to the Qt 3 compatibility library. It has been replaced by QCache<int, T>.

For details, read the section on QCache<T>, mentally substituting `int` for QString.

## QIntDict<T>

QIntDict<T> and QIntDictIterator<T> have been moved to the Qt 3 compatibility library. They have been replaced by the more modern QHash<Key, T> and QMultiHash<Key, T> classes and their associated iterator classes.

When porting old code that uses QIntDict<T> to Qt 4, there are four classes that you can use:

- QMultiHash<int, T *>
- QMultiHash<int, T *>
- QHash<int, T>
- QHash<int, T>

For details, read the section on QDict<T>, mentally substituting `int` for QString.

## QIODevice

The QIODevice class's API has been simplified to make it easier to subclass and to make it work more nicely with asynchronous devices such as QTcpSocket and QProcess.

The following virtual functions have changed name or signature:

Qt 3 function | Comment
--- | ---
QIODevice::at() const | Renamed QIODevice::pos().
QIODevice::at(Offset) | Renamed QIODevice::seek().
QIODevice::open(int) | The parameter is now of type QIODevice::OpenMode.
QIODevice::readBlock(char *, Q_ULONG) | QIODevice::readData(char *, Q_LONGLONG)
QIODevice::writeBlock(const char *, Q_ULONG) | QIODevice::writeData(const char *, Q_LONGLONG)

The following functions are no longer virtual or don't exist anymore:

QIODevice::getch() | Renamed QIODevice::getChar() and implemented in terms of QIODevice::readData().
QIODevice::putch(int) | Renamed QIODevice::putChar() and implemented in terms of QIODevice::writeData().
QIODevice::readAll() | Implemented in terms of QIODevice::readData().
QIODevice::readLine(char *, Q_ULONG) | Implemented in terms of QIODevice::readData()
QIODevice::ungetch(int) | Renamed QIODevice::ungetChar() and simulated using an internal unget buffer.

The `IO_xxx` flags have been revised. Most of them have been elimiated, because errors are best handled by the actual QIODevice subclasses than through the base classes. The file access flags, such as `IO_ReadOnly` and `IO_WriteOnly`, have been moved to the QIODevice class to avoid polluting the global namespace. The table below shows the correspondence between the Qt 3 `IO_xxx` flags and the Qt 4 API:

Qt 3 constant | Qt 4 equivalent
--- | ---
IO_Direct | Use !QIODevice::isSequential() instead (notice the not).
IO_Sequential | Use QIODevice::isSequential() instead.
IO_Combined | N/A
IO_TypeMask | N/A
IO_Raw | N/A
IO_Async | N/A
IO_ReadOnly | QIODevice::ReadOnly
IO_WriteOnly | QIODevice::WriteOnly
IO_ReadWrite | QIODevice::ReadWrite
IO_Append | QIODevice::Append
IO_Truncate | QIODevice::Truncate
IO_Translate | QIODevice::Translate
IO_ModeMask | N/A
IO_Open | Use QIODevice::isOpen() instead.
IO_StateMask | N/A
IO_Ok | N/A
IO_ReadError | N/A
IO_WriteError | N/A
IO_FatalError | N/A
IO_ResourceError | N/A
IO_OpenError | N/A
IO_ConnectError | N/A
IO_AbortError | N/A
IO_TimeOutError | N/A
IO_UnspecifiedError | N/A

## QIODeviceSource

The QIODeviceSource class was used internally in Qt 2.x in conjunction with QImageConsumer. It was obsoleted in Qt 3.0. If you use this mechanism in your application, contact qt-bugs@trolltech.com and we will try to find a satisfying substitute.

## QIconFactory

The QIconFactory class is no longer part of the Qt API. It has been replaced by a "pixmap generator function" mechanism; see QIcon::setPixmapGeneratorFn() for details.

## QLabel

See Virtual Functions for a list of QLabel virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QLayout

QLayout setSupportsMargin()

See also the section on QLayoutIterator and the section on QGLayoutIterator.

## QLayoutIterator

The QLayoutIterator class is obsoleted in Qt 4. It is available only if `QT_COMPAT` is defined. It can be replaced by the QLayout::itemAt() and QLayout::takeAt() functions, which operate on indexes.

For example, if you have code like

            QLayoutIterator it = layout()->iterator();
            QLayoutItem *child;
            while ((child = it.current()) != 0) {
                if (child->widget() == myWidget) {
                    it.takeCurrent();
                    return;
                ++it;
            }

you can rewrite it as

            int i = 0;
            QLayoutItem *child;
            while ((child = layout()->itemAt(i)) != 0) {
                if (child->widget() == myWidget) {
                    layout()->takeAt(i);
                    return;
                }
                ++i;
            }

## QLineEdit

See Properties for a list of QLineEdit properties in Qt 3 that have changed in Qt 4.

## QListBox

The `QListBox`, `QListBoxItem`, `QListBoxText`, and `QListBoxPixmap` classes have been renamed Q3ListBox, Q3ListBoxItem, Q3ListBoxText, and Q3ListBoxPixmap and have been moved to the Qt 3 compatibility library. New Qt applications should use QListWidget or its base class QListView instead.

See Model/View Programming for an overview of the new item view classes.

## QListView

The `QListView`, `QListViewItem`, `QCheckListItem`, and `QListViewItemIterator` classes have been renamed Q3ListView, Q3ListViewItem, Q3CheckListItem, and Q3ListViewItemIterator, and have been moved to the Qt 3 compatibility library. New Qt applications should use one of the following four classes instead: QTreeView or QTreeWidget for tree-like structures; QListWidget or the new QListView class for one-dimensional lists.

See Model/View Programming for an overview of the new item view classes.

## QLocalFs

The `QLocalFs` class is no longer part of the public Qt API. It has been renamed Q3LocalFs and moved to the Qt 3 compatibility library. Use QDir, QFileInfo, or QFile instead.

## QMainWindow

The QMainWindow class has been redesigned in Qt 4 to provide a more modern look and feel and more flexibility. The API has changed to reflect that. The old `QMainWindow` class has been renamed Q3MainWindow and moved to the Qt 3 compatibility library. See the QMainWindow class documentation for details.

## QMemArray<T>

QMemArray<T> has been moved to the Qt 3 compatibility library. It has been replaced by the QVector<T> class.

The following table summarizes the API differences between the two classes.

QMemArray::assign(const QMemArray<T> &) | QVector::operator=()
QMemArray::assign(const T *, uint) | See remark below
QMemArray::duplicate(const QMemArray &) | QVector::operator=()
QMemArray::duplicate(const T *, uint) | See remark below
QMemArray::setRawData(const T *, uint) | N/A
QMemArray::resetRawData(const T *, uint) | N/A
QMemArray::find(const T &, uint) | QVector::indexOf(const T &, int)
QMemArray::contains(const T &) | QVector::count(const T &)
QMemArray::sort() | qHeapSort()
QMemArray::bsearch(const T &d) | qBinaryFind()
QMemArray::at(uint) | QVector::operator[]()
QMemArray::operator const T *() | QVector::constData()

Remarks:

1. QMemArray::assign(const T *, uint) and QMemArray::duplicate(const T *, uint) can be replaced by QVector::resize() and qCopy().

   For example, if you have code like

               QMemArray<QSize> array;
               ...
               array.assign(data, size);

   you can rewrite it as

               QVector<QSize> vector;
               ...
               vector.resize(size);
               qCopy(data, data + size, vector.begin());

2. QMemArray is an explicitly shared class, whereas QVector is implicitly shared. See Explicit Sharing for more information.

## QMessageBox

The QMessageBox::iconPixmap() function used to return a "const QPixmap *". In Qt 4, it returns a QPixmap.

## QMimeSourceFactory

The `QMimeSourceFactory` has been renamed Q3MimeSourceFactory and moved to the Qt 3 compatibility library. New Qt applications should use Qt 4's Resource System instead.

## QMultiLineEdit

The `QMultiLineEdit` class in Qt 3 was a convenience QTextEdit subclass that provided an interface compatible with Qt 2's QMultiLineEdit class. In Qt 4, it is called Q3MultiLineEdit, it inherits Q3TextEdit, and it is part of the Qt 3 compatibility library. Use QTextEdit in new code.

## QNetworkProtocol

The QNetworkProtocol, QNetworkProtocolFactoryBase, QNetworkProtocolFactory<T>, and QNetworkOperation classes are no longer part of the public Qt API. They have been renamed Q3NetworkProtocol, Q3NetworkProtocolFactoryBase, Q3NetworkProtocolFactory<T>, and Q3NetworkOperation and have been moved to the Qt 3 compatibility library.

In Qt 4 applications, you can use classes like QFtp and QHttp directly to perform file-related actions on a remote host.

## QObject

children() and QueryList now return a QObjectList instead of a pointer to a QObjectList. See also the comments on QObjectList.

QObject::killTimers() has been removed because it was unsafe to use in subclass. (A subclass normally doesn't know whether the base class uses timers or not.)

The QObject::name property has been renamed QObject::objectName.

## QObjectDictionary

The QObjectDictionary class is a synonym for QAsciiDict<QMetaObject>. See the section on QAsciiDict<T>.

## QObjectList

In Qt 3, the QObjectList class was a typedef for QPtrList<QObject>. In Qt 4, it is a typedef for QList<QObject *>. See the section on QPtrList<T>.

## QPaintDevice

To reimplement painter backends one previously needed to reimplement the virtual function QPaintDevice::cmd(). This function is taken out and should is replaced with the function QPaintDevice::paintEngine() and the abstract class QPaintEngine. QPaintEngine provides virtual functions for all drawing operations that can be performed on a painter backend.

bitBlt() and copyBlt() are now only compatibility functions. Use QPainter::drawPixmap() instead.

## QPaintDeviceMetrics

All functions that used to be provided by the `QPaintDeviceMetrics` class have now been moved to QPaintDevice.

For example, if you have code like

            QPaintDeviceMetrics metrics(widget);
            int deviceDepth = metrics.depth();

you can rewrite it as

            int deviceDepth = widget->depth();

For compatibility, the old `QPaintDeviceMetrics` class has been renamed Q3PaintDeviceMetrics and moved to the Qt 3 compatibility library.

## QPainter

The QPainter class has undergone some changes in Qt 4 because of the way rectangles are drawn. In Qt 4, the result of drawing a QRect with a pen width of 1 pixel is 1 pixel wider and 1 pixel taller than in Qt 3.

For compatibility, we provide a Q3Painter class in the Qt 3 compatibility library that provides the old semantics. See the Q3Painter documentation for details and for the reasons why we had to do this change.

## QPixmap

QPixmap::fromMimeSource(const QString &) -> qPixmapFromMimeSource(const QString &)

## QPointArray

In Qt 3, QPointArray inherited from QMemArray<QPoint>. In Qt 4, it inherits from QVector<QPoint>. Everything mentioned in the section on QMemArray<T> apply for QPointArray as well.

The QPointArray::setPoints() and QPointArray::putPoints() functions returned a bool in Qt 3, indicating whether the array was successfully resized or not. In Qt 4, they return void.

## QProcess

The QProcess class has undergone drastic changes in Qt 4. It now inherits QIODevice, which makes it possible to combine QProcess with a QTextStream or a QDataStream.

The old `QProcess` class has been renamed Q3Process and moved to the Qt 3 compatibility library.

## QProgressBar

The QProgressBar API has been significantly improved in Qt 4. The old `QProgressBar` API is available as Q3ProgressBar in the Qt 3 compatibility library.

## QProgressDialog

The QProgressDialog API has been significantly improved in Qt 4. The old `QProgressDialog` API is available as Q3ProgressDialog in the Qt 3 compatibility library.

See Properties for a list of QProgressDialog properties in Qt 3 that have changed in Qt 4.

## QPtrCollection<T>

The `QPtrCollection<T>` abstract base class has been renamed Q3PtrCollection<T> moved to the Qt 3 compatibility library. There is no direct equivalent in Qt 4.

See Generic Containers for a list of

## QPtrDict<T>

`QPtrDict<T>` and `QPtrDictIterator<T>` have been renamed Q3PtrDict<T> and Q3PtrDictIterator<T> and have been moved to the Qt 3 compatibility library. They have been replaced by the more modern QHash<Key, T> and QMultiHash<Key, T> classes and their associated iterator classes.

When porting old code that uses Q3PtrDict<T> to Qt 4, there are four classes that you can use:

- QMultiHash<void *, T *>
- QMultiHash<void *, T *>
- QHash<void *, T>
- QHash<void *, T>

(You can naturally use other types than `void *` for the key type, e.g. `QWidget *`.)

To port Q3PtrDict<T> to Qt 4, read the section on QDict<T>, mentally substituting `void *` for QString.

## QPtrList<T>

QPtrList<T>, QPtrListIterator<T>, and QPtrListStdIterator<T> have been moved to the Qt 3 compatibility library. They have been replaced by the more modern QList and QLinkedList classes and their associated iterator classes.

When porting to Qt 4, you have the choice of using QList<T> or QLinkedList<T> as alternatives to QValueList<T>. QList<T> has an index-based API and provides very fast random access (QList::operator[]), whereas QLinkedList<T> has an iterator-based API.

The following table summarizes the API differences between QPtrList<T> and QList<T *>:

QPtrList function | QList equivalent
--- | ---
QPtrList::contains(const T *) | QList::count(T *)
QPtrList::containsRef(const T *) | QList::count(T *)
QPtrList::find(const T *) | See remark below
QPtrList::findRef(const T *) | See remark below
QPtrList::getFirst() | QList::first()
QPtrList::getLast() | QList::last()
QPtrList::inSort(const T *) | N/A
QPtrList::remove(const T *) | QList::removeAll(T *)
QPtrList::remove(uint) | QList::removeAt(int)
QPtrList::removeNode(QLNode *) | N/A
QPtrList::removeRef(const T *) | QList::removeAll(T *)
QPtrList::sort() | See remark below
QPtrList::takeNode(QLNode *) | N/A
QPtrList::toVector(QGVector *) | See remark below

Remarks:

1. QPtrList::toVector(QGVector *) can be replaced by QVector::resize() and qCopy().

   For example, if you have code like

               QPtrList<QWidget> list;
               ...
               QPtrVector<QWidget> vector;
               list.toVector(&vector);

   you can rewrite it as

               QList<QWidget *> list;
               ...
               QVector<QWidget *> vector;
               vector.resize(list.size());
               qCopy(list.begin(), list.end(), vector.begin());

2. QPtrList::sort() relied on the virtual comparedItems() to sort items. In Qt 4, you can use qHeapSort() instead and pass your "compare item" function as an argument.
3. QPtrList::find(const T *) returns an iterator, whereas QList::indexOf(T *) returns an index. To convert an index into an iterator, add the index to QList::begin().
4. QPtrList::removeFirst() and QPtrList::removeLast() return a `bool` that indicates whether the element was removed or not. The corresponding QList functions return `void`. You can achieve the same result by calling QList::isEmpty() before attempting to remove an item.

If you use QPtrList's auto-delete feature (by calling QPtrList::setAutoDelete(true)), you need to do some more work. You have two options: Either you call `delete` yourself whenever you remove an item from the container, or you can use QList<T> instead of QList<T *> (i.e. store values directly instead of pointers to values). Here, we'll see when to call `delete`.

The following table summarizes the idioms that you need to watch out for if you want to call `delete` yourself.

QPtrList idiom | QList idiom
--- | ---

            list.replace(index, value);

            delete list[index];
            list[index] = value;

            list.removeFirst();

            delete list.takeFirst();

            list.removeLast();

            delete list.takeLast();

            list.remove(index);

            delete list.take(index);

            list.remove(value);

            int i = list.indexOf(value);
            if (i != -1)
                delete list.takeAt(i);

            list.remove();

(removes the current item)

            QListMutableIterator<T *> i;
            ...
            delete i.value();
            i.remove();

            list.clear();

(also called from QPtrList's destructor)

            while (!list.isEmpty())
                delete list.takeFirst();

In 99% of cases, the following idiom also works:

            qDeleteAll(list);
            list.clear();

However, it may lead to crashes if `list` is referenced from the value type's destructor, because `list` contains dangling pointers until clear() is called.

Be aware that QPtrList's destructor automatically calls clear(). If you have a QPtrList data member in a custom class and use the auto-delete feature, you will need to call `delete` on all the items in the container from your class destructor to avoid a memory leak.

QPtrList had the concept of a "current item", which could be used for traversing the list without using an iterator. When porting to Qt 4, you can use the Java-style QListIterator<T *> (or QListMutableIterator<T *>) class instead. The following table summarizes the API differences:

QPtrList function | QListIterator equivalent
--- | ---
QPtrList::at() | N/A
QPtrList::current() | QListIterator::value()
QPtrList::currentNode() | N/A
QPtrList::findNext(const T *) | QListIterator::findNext(const T *)
QPtrList::findNextRef(const T *) | QListIterator::findNext(const T *)
QPtrList::first() | QPtrList::toFront()
QPtrList::last() | QPtrList::toBack()
QPtrList::next() | QPtrList::next()
QPtrList::prev() | QPtrList::previous()
QPtrList::remove() | QListMutableIterator::remove()
QPtrList::take() | QListMutableIterator::remove()

Be aware that QListIterator has a different way of iterating than QPtrList. A typical loop with QPtrList looks like this:

            QPtrList<QWidget> list;
            ...
            while (list.current() != 0) {
                do_something(list.current());
                list.next();
            }

Here's the equivalent QListIterator loop:

            QList<QWidget *> list;
            ...
            QListIterator<QWidget *> i(list);
            while (i.hasNext())
                do_something(i.next());

Finally, QPtrListIterator<T> must also be ported. There are no fewer than four iterator classes that can be used as a replacement: QList::const_iterator, QList::iterator, QListIterator, and QListMutableIterator. The most straightforward class to use when porting is QListMutableIterator<T *> (if you modify the list through the iterator) or QListIterator<T *> (if you don't). The following table summarizes the API differences:

QPtrListIterator function | Qt 4 equivalent
--- | ---
QPtrListIterator::atFirst() | !QListIterator::hasPrevious() (notice the `!`)
QPtrListIterator::atLast() | !QListIterator::hasNext() (notice the `!`)
QPtrListIterator::count() | QList::count() or QList::size()
QPtrListIterator::current() | QListIterator::value()
QPtrListIterator::isEmpty() | QList::isEmpty()
QPtrListIterator::toFirst() | QListIterator::toFront()
QPtrListIterator::toLast() | QListIterator::toBack()
QPtrListIterator::operator() | QListIterator::value()
QPtrListIterator::operator*() | QListIterator::value()

Again, be aware that QListIterator has a different way of iterating than QPtrList. A typical loop with QPtrList looks like this:

            QPtrList<QWidget> list;
            ...
            QPtrListIterator<QWidget> i;
            while (i.current() != 0) {
                do_something(i.current());
                i.next();
            }

Here's the equivalent QListIterator loop:

            QList<QWidget *> list;
            ...
            QListIterator<QWidget *> i(list);
            while (i.hasNext())
                do_something(i.next());

Finally, QPtrListStdIterator<T> must also be ported. This is easy, because QList also provides STL-style iterators (QList::iterator and QList::const_iterator).

## QPtrQueue<T>

QPtrQueue has been moved to the Qt 3 compatibility library. It has been replaced by the more modern QQueue class.

The following table summarizes the differences between QPtrQueue<T> and QQueue<T *>:

QPtrQueue function | QQueue equivalent
--- | ---
QPtrQueue::autoDelete() | See discussion below
QPtrQueue::count() | QQueue::count() or QQueue::size() (equivalent)
QPtrQueue::current() | QQueue::head()
QPtrQueue::remove() | QQueue::dequeue()
QPtrQueue::setAutoDelete() | See discussion below

If you use QPtrQueue's auto-delete feature (by calling QPtrQueue::setAutoDelete(true)), you need to do some more work. You have two options: Either you call `delete` yourself whenever you remove an item from the container, or you can use QQueue<T> instead of QQueue<T *> (i.e. store values directly instead of pointers to values). Here, we will show when to call `delete`.

QPtrQueue idiom | QQueue idiom
--- | ---

            queue.dequeue();

            delete queue.dequeue();

            queue.remove();

            delete queue.dequeue();

            queue.clear();

(also called from QPtrQueue's destructor)

            while (!queue.isEmpty())
                delete queue.dequeue();

In 99% of cases, the following idiom also works:

            qDeleteAll(queue);
            queue.clear();

However, it may lead to crashes if `queue` is referenced from the value type's destructor, because `queue` contains dangling pointers until clear() is called.

## QPtrStack<T>

QPtrStack has been moved to the Qt 3 compatibility library. It has been replaced by the more modern QStack class.

The following table summarizes the differences between QPtrStack<T> and QStack<T *>:

QPtrStack function | QStack equivalent
--- | ---
QPtrStack::autoDelete() | See discussion below
QPtrStack::count() | QStack::count() or QStack::size() (equivalent)
QPtrStack::current() | QStack::top()
QPtrStack::remove() | QStack::pop()
QPtrStack::setAutoDelete() | See discussion below

If you use QPtrStack's auto-delete feature (by calling QPtrStack::setAutoDelete(true)), you need to do some more work. You have two options: Either you call `delete` yourself whenever you remove an item from the container, or you can use QStack<T> instead of QStack<T *> (i.e. store values directly instead of pointers to values). Here, we will show when to call `delete`.

QPtrStack idiom | QStack idiom
--- | ---

            stack.pop();

            delete stack.pop();

            stack.remove();

            delete stack.pop();

            stack.clear();

(also called from QPtrStack's destructor)

            while (!stack.isEmpty())
                delete stack.pop();

In 99% of cases, the following idiom also works:

            qDeleteAll(stack);
            stack.clear();

However, it may lead to crashes if `stack` is referenced from the value type's destructor, because `stack` contains dangling pointers until clear() is called.

## QPtrVector<T>

QPtrVector<T> has been moved to the Qt 3 compatibility library. It has been replaced by the more modern QVector class.

When porting to Qt 4, you can use QVector<T *> as an alternative to QPtrVector<T>. The APIs of QPtrVector<T> and QVector<T *> are somewhat similar. The main issue is that QPtrVector supports auto-delete whereas QVector doesn't.

The following table summarizes the API differences between the two classes:

QPtrVector function | QVector equivalent
--- | ---
QPtrVector::autoDelete() | See discussion below
QPtrVector::bsearch(const T *) | qBinaryFind()
QPtrVector::contains(const T *) | QVector::count(T *)
QPtrVector::containsRef(const T *) | QVector::count(T *)
QPtrVector::count() | See remark below
QPtrVector::insert(uint, T *) | See remark below
QPtrVector::isNull() | N/A
QPtrVector::remove(uint) | See remark below
QPtrVector::setAutoDelete() | See discussion below
QPtrVector::sort() | qHeapSort()
QPtrVector::take(uint) | See remark below
QPtrVector::toList(QGList *) | QList::QList(const QVector &)

Remarks:

1. QPtrVector::insert(uint, T *) sets an item to store a certain pointer value. This is not the same as QVector::insert(int, T *), which creates space for the item by moving following items by one position. Use `vect[i] = ptr` to set a QVector item to a particular value.
2. QPtrVector::remove(uint) sets an item to be 0. This is not the same as QVector::removeAt(int), which entirely erases the item, reducing the size of the vector. Use `vect[i] = 0` to set a QVector item to 0.
3. Likewise, QPtrVector::take(uint) sets an item to be 0 and returns the previous value of the item. Again, this is easy to achieve using QVector::operator[]().
4. QPtrVector::count() returns the number of non-null items in the vector, whereas QVector::count() (like QVector::size()) returns the number of items (null or non-null) in the vector. Fortunately, it's not too hard to simulate QPtrVector::count().

   For example, if you have code like

               int numValidItems = vect.count();

   you can rewrite it as

               int numValidItems = vect.size() - vect.count(0);

If you use QVector's auto-delete feature (by calling QVector::setAutoDelete(true)), you need to do some more work. You have two options: Either you call `delete` yourself whenever you remove an item from the container, or you use QVector<T> instead of QVector<T *> (i.e. store values directly instead of pointers to values). Here, we'll see when to call `delete`.

The following table summarizes the idioms that you need to watch out for if you want to call `delete` yourself.

QPtrVector idiom | QVector idiom
--- | ---

            vect.insert(i, ptr);

            delete vect[i];
            vect[i] = ptr;

            vect.remove(i);

            delete vect[i];
            vect[i] = 0;

            T *ptr = vect.take(i);

            T *ptr = vect[i];
            vect[i] = 0;

            vect.resize(n)

            while (n > vect.size())
                vect.append(0);
            while (n < vect.size() {
                T *ptr = vect.last();
                vect.remove(vect.size() - 1);
                delete ptr;
            }

            vect.clear();

(also called from QPtrVector's destructor)

            for (int i = 0; i < vect.size(); ++i)
                T *ptr = vect[i];
                vect[i] = 0;
                delete ptr;
            }

In 99% of cases, the following idiom also works:

            qDeleteAll(vect);
            vect.clear();

However, it may lead to crashes if `vect` is referenced from the value type's destructor, because `vect` contains dangling pointers until clear() is called.

Be aware that QPtrVector's destructor automatically calls clear(). If you have a QPtrVector data member in a custom class and use the auto-delete feature, you will need to call `delete` on all the items in the container from your class destructor to avoid a memory leak.

## QPushButton

See Properties for a list of QPushButton properties in Qt 3 that have changed in Qt 4.

## QRangeControl

In Qt 3, various "range control" widgets (QDial, QScrollBar, QSlider, and QSpinBox) inherited from both QWidget and `QRangeControl`.

In Qt 4, `QRangeControl` has been replaced with the new QAbstractSlider class, which inherits from QWidget and provides similar functionality. Apart from eliminating unnecessary multiple inheritance, the new design allows QAbstractSlider to contain signals, slots, and properties.

The old `QRangeControl` class has been renamed Q3RangeControl and moved to the Qt 3 compatibility library, together with the (undocumented) `QSpinWidget` class.

If you use `QRangeControl` as a base class in your application, you can switch to use QAbstractSlider instead.

For example, if you have code like

            class VolumeControl : public QWidget, public QRangeControl
            {
                ...
            protected:
                void valueChange() {
                    update();
                    emit valueChanged(value());
                }
                void rangeChange() {
                    update();
                }
                void stepChange() {
                    update();
                }
            };

you can rewrite it as

            class VolumeControl : public QAbstractSlider
            {
                ...
            protected:
                void sliderChange(SliderChange change) {
                    update();
                    if (change == SliderValueChange)
                        emit valueChanged(value());
                }
            };

## QRegion

The following changes have been made to QRegion in Qt 4:

- There is no longer any difference between a null region and an empty region. Use isEmpty() in most places where you would have used a null QRegion.
- QRegion::rects() used to return a QMemArray<QRect>. It now returns a QVector<QRect>.

## QScrollBar

See Properties for a list of QScrollBar properties in Qt 3 that have changed in Qt 4.

## QScrollView

The `QScrollView` class has been renamed Q3ScrollView and moved to the Qt 3 compatibility library. It has been replaced by the QViewport and QWidgetView classes.

`QScrollView` was designed to work around the 16-bit limitation on widget coordinates found on most window systems. In Qt 4, this is done transparently for all widgets, so there is no longer a need for such functionality in `QScrollView`. For that reason, the new QViewport and QWidgetView classes are much more lightweight, and concentrate on handling scroll bars.

## QServerSocket

The `QServerSocket` class has been renamed Q3ServerSocket and moved to the Qt 3 compatibility library. In Qt 4, it has been replaced by QTcpServer.

With Q3ServerSocket, connections are accepted by reimplementing a virtual function (Q3ServerSocket::newConnection()). With QTcpServer, on the other hand, you don't need to subclass. Instead, simply connect to the QTcpServer::newConnection() signal.

## QShared

The `QShared` class has been obsoleted by the more powerful QSharedData and QSharedDataPointer as a means of creating custom implicitly shared classes. It has been renamed Q3Shared moved to the Qt 3 compatibility library.

An easy way of porting to Qt 4 is to include this class into your project and to use it instead of `QShared`:

            struct Shared
            {
                Shared() : count(1) {}
                void ref() { ++count; }
                bool deref() { return !--count; }
                uint count;
            };

If possible, we recommend that you use QSharedData and QSharedDataPointer instead. They provide thread-safe reference counting and handle all the reference counting behind the scenes, eliminating the risks of forgetting to increment or decrement the reference count.

## QSignal

The QSignal class has been completely redesigned in Qt 4. For compatibility, the old `QSignal` class has been renamed Q3Signal and has been moved to the Qt 3 compatibility library.

The new QSignal class is a template class, where the template type gives the parameter type of the signal. For example, if you used Q3Signal class's @C{intSignal(int)} signal, you can now use QSignal<int>'s @C{signal(int)} signal instead.

The Q3Signal::setParameter(), Q3Signal::parameter(), Q3Signal::setValue(), and Q3Signal::value() functions have no direct equivalent in Qt 4. Instead, pass the value to QSignal::activate().

For example, if you have code like

            QSignal signal;
            signal.connect(target, SLOT(display(int)));
            ...
            signal.setParameter(5);
            signal.activate();

you can rewrite it as

            QSignal<int> signal;
            signal.connect(target, SLOT(display(int)));
            ...
            signal.activate(5);

## QSimpleRichText

The `QSimpleRichText` class has been renamed Q3SimpleRichText and moved to the Qt 3 compatibility library.

See Rich Text for an overview of the Qt 4 rich text classes.

## QSlider

The QSlider::sliderStart() and QSlider::sliderRect() functons have been removed. You can retrieve this information using QAbstractSlider::sliderPosition() and QStyle::querySubControlMetrics(), respectively.

See Properties for a list of QSlider properties in Qt 3 that have changed in Qt 4.

## QSocket

The `QSocket` class has been renamed Q3Socket and moved to the Qt 3 compatibility library. In Qt 4, it has been replaced by the QTcpSocket class, which inherits most of its functionality from QAbstractSocket.

## QSocket

The `QSocketDevice` class has been renamed Q3SocketDevice and moved to the Qt 3 compatibility library. In Qt 4, there is no direct equivalent to Q3SocketDevice:

- If you use Q3SocketDevice in a thread to perform blocking network I/O (a technique encouraged by the Qt Quarterly article Unblocking Networking), you can now use QTcpSocket, QFtp, or QHttp instead, which can now be used from non-GUI threads.
- If you use Q3SocketDevice for UDP, you can now use QUdpSocket instead.
- If you use Q3SocketDevice for other uses, Qt 4 offers no alternative right now. However, there is a `QSocketLayer` internal class that offers a low-level socket API similar to Q3SocketDevice. Should the need for such functionality arise in Qt 4 applications, we will consider making this class public in a later release (e.g., Qt 4.1).

## QSortedList

The QSortedList<T> class has been deprecated since Qt 3.0. In Qt 4, it has been moved to the Qt 3 compatibility library.

In new code, we recommend that you use QList<T> instead and use qHeapSort() to sort the items.

## QSplitter

The function setResizeMode() has been moved into compat. Set the stretch factor in the widget's size policy to get equivalent functionality.

The obsolete function drawSplitter() has been removed. Use QStyle::drawPrimitive() to acheive similar functionality.

## QSpinBox

See Properties for a list of QSpinBox properties in Qt 3 that have changed in Qt 4.

## QSqlCursor

The `QSqlCursor` class has been renamed Q3SqlCursor and moved to the Qt 3 compatibility library. In Qt 4, you can use QSqlQuery, QSqlQueryModel, or QSqlTableModel, depending on whether you want a low-level or a high-level interface for accessing databases.

See SQL Module for an overview of the new SQL classes.

## QSqlDatabase

QSqlDatabase is now a smart pointer that is passed around by value. Simply replace all QSqlDatabase pointer by QSqlDatabase objects.

## QSqlEditorFactory

The `QSqlEditorFactory` class has been renamed Q3SqlEditorFactory and moved to the Qt 3 compatibility library.

See SQL Module for an overview of the new SQL classes.

## QSqlError

The enum `Type` was renamed to `ErrorType`, The values were renamed as well:

- None - use NoError instead
- Connection - use ConnectionError instead
- Statement - use StatementError instead
- Transaction - use TransactionError instead
- Unknown - use UnknownError instead

## QSqlFieldInfo

The QSqlFieldInfo class has been moved to the Qt 3 compatibility library. Its functionality is now provided by the QSqlField class.

See SQL Module for an overview of the new SQL classes.

## QSqlForm

The `QSqlForm` class has been renamed Q3SqlForm and moved to the Qt 3 compatibility library.

See SQL Module for an overview of the new SQL classes.

## QSqlPropertyMap

The `QSqlPropertyMap` class has been renamed Q3SqlPropertyMap moved to the Qt 3 compatibility library.

See SQL Module for an overview of the new SQL classes.

## QSqlQuery

QSqlQuery::prev() was renamed to QSqlQuery::previous(). There is a function call for compatibility, but if you subclassed QSqlQuery, you have to reimplement previous() instead of prev().

## QSqlRecord

QSqlRecord behaves like a vector now, QSqlRecord::insert() will actually insert a new field instead of replacing the existing one.

## QSqlRecordInfo

The QSqlRecordInfo class has been moved to the Qt 3 compatibility library. Its functionality is now provided by the QSqlRecord class.

See SQL Module for an overview of the new SQL classes.

## QSqlSelectCursor

The `QSqlSelectCursor` class has been renamed Q3SqlSelectCursor and moved to the Qt 3 compatibility library.

See SQL Module for an overview of the new SQL classes.

## QStoredDrag

The `QStoredDrag` class has been renamed Q3StoredDrag and moved to the Qt 3 compatibility library. In Qt 4, use QMimeData instead and call QMimeData::setData() to set the data.

## QStr(I)List

The QStrList and QStrIList convenience classes have been deprecated since Qt 2.0. In Qt 4, they have been moved to the Qt 3 compatibility library. If you used any of these, we recommend that you use QStringList or QList<QByteArray> instead.

## QStr(I)Vec

The QStrVec and QStrIVec convenience classes have been deprecated since Qt 2.0. In Qt 4, they have been moved to the Qt 3 compatibility library. If you used any of these, we recommend that you use QStringList or QList<QByteArray> instead.

## QString

Here are the main issues to be aware of when porting QString to Qt 4:

1. The QString::QString(QChar) constructor performed implicit conversion in Qt 3. Now, you will need a cast to convert a QChar to a QString.
2. The QString::QString(const QByteArray &) constructor used to stop at the first '\0' it encountered, for compatibility with Qt 1. This quirk has now been fixed; in Qt 4, the resulting QString always has the same length as the QByteArray that was passed to the constructor.
3. The QString::null static constant has been deprecated in Qt 4. For compatibility, Qt 4 provides a QString::null symbol that behaves more or less the same as the old constant. The new idiom is to write QString() instead of QString::null, or to call clear().

   For example, if you have code like

                   str1 = QString::null;
                   if (str2 == QString::null)
                       do_something(QString::null);

   you can rewrite it as

                   str1.clear();
                   if (str2.isNull())
                       do_something(QString());

4. QString::at() returned a non-const reference, whereas the new QString::at() returns a const value. Code like

               str.at(0) = 'X';

   will no longer compile. Instead, use QString::operator[]:

               str[0] = 'X';

5. The QString::contains(x) function (where x is a character or a string) has been renamed QString::count(x). In addition, there now exists a set of QString::contains() functions that returns a boolean value. Replace old calls to contains() with either count() or contains(), depending on whether you care about the specific number of occurrences of a character in the string or only care about whether the string contains that character or not.
6. Many functions in QString had a `bool` parameter that specified case sensitivity. In Qt 4, in the interest of code readability and maintainability, the `bool` parameters have been replaced by the Qt::CaseSensitivity enum, which can take the values Qt::CaseSensitive and Qt::CaseInsensitive.

   For example, if you have code like

                   if (url.startsWith("http:", false))
                       ...

   you can rewrite it as

                   if (url.startsWith("http:", Qt::CaseInsensitive))
                       ...

7. The QString::setExpand(uint, QChar) function, which already was obsolete in Qt 3, is no longer available. Use QString::operator[] instead.

   For example, if you have code like

                   str.setExpand(32, '$');

   you can rewrite it as

                   str[32] = '$';

8. The `QT_NO_ASCII_CAST` and `QT_NO_CAST_ASCII` macros have been renamed `QT_NO_CAST_TO_ASCII` and `QT_NO_CAST_FROM_ASCII`, respectively.
9. QString::ascii() and QString::latin1() now return "" (the empty string) rather than 0 (the null pointer). The new behavior prevents crashes when interfacing with the standard C++ library.
10. QString::utf8() and QString::local8Bit() used to return a QByteArray. They now return a `const char *`, to be consistent with QString::ascii() and QString::latin1(). Call QString::toUtf8() or QString::toLocal8Bit() if you want a QByteArray.
11. The QString::data() used to return the same as QString::ascii(). It now returns a pointer to the Unicode data stored in the QString object. Call QString::ascii() if you want the old behavior.
12. QString::simpleText() has been renamed QString::isSimpleText().

## QStringList

QStringList now inherits from QList<QString> and can no longer be converted to a QValueList<QString>. Since QValueList inherits QList a cast will work as expected.

This change implies some API incompatibilities for QStringList. For example, at() returns the string, not an iterator. See the section on QValueList for details.

## QStyleSheet

The QStyleSheet and QStyleSheetItem classes have been renamed Q3StyleSheet and Q3StyleSheetItemm, and have been moved to the Qt 3 compatibility library.

See Rich Text for an overview of the Qt 4 rich text classes.

## QSyntaxHighlighter

The QSyntaxHighlighter class has been renamed Q3SyntaxHighlighter and moved to the Qt 3 compatibility library.

See Rich Text for an overview of the Qt 4 rich text classes.

## QTabBar

See Properties for a list of QTabBar properties in Qt 3 that have changed in Qt 4.

## QTabDialog

The `QTabDialog` class is no longer part of the public Qt API. It has been renamed Q3TabDialog and moved to the Qt 3 compatibility library. In Qt 4 applications, you can easily obtain the same result by combining a QTabWidget with a QDialog and provide QPushButtons yourself.

See also the dialogs/tabdialog example, which shows how to implement tab dialogs in Qt 4.

## QTabWidget

See Properties for a list of QTabWidget properties in Qt 3 that have changed in Qt 4.

## QTable

The `QTable`, `QTableItem`, `QComboTableItem`, `QCheckTableItem`, and `QTableSelection` classes have been renamed Q3Table, Q3TableItem, Q3ComboTableItem, Q3CheckTableItem, and Q3TableSelection and moved to the Qt 3 compatibility library. New Qt applications should use the new QTableWidget or QTableView class instead.

See Model/View Programming for an overview of the new item view classes.

## QTextDrag

The `QTextDrag` class has been renamed Q3TextDrag and moved to the Qt 3 compatibility library. In Qt 4, use QMimeData instead and call QMimeData::setText() to set the data.

## QTextEdit

The old QTextEdit and QTextBrowser classes have been renamed Q3TextEdit and Q3TextBrowser, and have been moved to the Qt 3 compatibility library. The new QTextEdit and QTextBrowser have a somewhat different API.

See Rich Text for an overview of the Qt 4 rich text classes.

## QTextOStreamIterator

The undocumented `QTextOStreamIterator` class has been removed from the Qt library. If you need it in your application, feel free to copy the source code from the Qt 3 `<qtl.h>` header file.

## QTextView

The `QTextView` class has been renamed Q3TextView and moved to the Qt 3 compatibility library.

## QTimeEdit

The `QTimeEdit` class has been renamed Q3TimeEdit and moved to the Qt 3 compatibility library. Use QDateTimeEdit instead.

See Virtual Functions for a list of `QTimeEdit` virtual member functions in Qt 3 that are no longer virtual in Qt 4.

## QToolBar

The old `QToolBar` class, which worked with the old `QMainWindow` and `QDockArea` classes and inherited from `QDockWindow`, has been renamed Q3ToolBar and moved to the Qt 3 compatibility library. Use the new QToolBar class in new applications.

## QToolButton

See Properties for a list of QToolBar properties in Qt 3 that have changed in Qt 4.

## QUriDrag

The `QUriDrag` class has been renamed Q3UriDrag and moved to the Qt 3 compatibility library. In Qt 4, use QMimeData instead and call QMimeData::setUrl() to set the URL.

## QUrl

The QUrl class has been rewritten from scratch in Qt 4 to be more standard-compliant. The old QUrl class has been renamed Q3Url and moved to the Qt 3 compatibility library.

The new QUrl class provides an extensive list of compatibility functions to ease porting from Q3Url to QUrl. A few functions require you to change your code:

- Q3Url::Q3Url(const Q3Url &, const QString &, bool) can be simulated by combining the URLs manually (using QString::operator+(), for example).
- Q3Url::setEncodedPathAndQuery(const QString &) is replaced by QUrl::setPath() and QUrl::setEncodedQuery().
- Q3Url::encodedPathAndQuery() is replaced by QUrl::path() and QUrl::encodedQuery().
- Q3Url::isLocalFile() can be simulated by checking that QUrl::protocol() is "file".
- Q3Url::toString(bool, bool) is replaced by QUrl::toString(int), where the `int` parameter specifies a combination of formatting options.

## QUrlOperator

The `QUrlOperator` class is no longer part of the public Qt API. It has been renamed Q3UrlOperator and moved to the Qt 3 compatibility library.

In Qt 4 applications, you can use classes like QFtp and QHttp directly to perform file-related actions on a remote host.

## QValueList<T>

The QValueList<T> class has been replaced by QList<T> and QLinkedList<T> in Qt 4. As a help when porting older Qt applications, the Qt 3 compatibility library contains a QValueList<T> class implemented in terms of the new QLinkedList<T>. Similarly, it contains QValueListIterator<T> and QValueListConstIterator<T> classes implemented in terms of QLinkedList<T>::iterator and QLinkedList<T>::const_iterator.

When porting to Qt 4, you have the choice of using QList<T> or QLinkedList<T> as alternatives to QValueList<T>. QList<T> has an index-based API and provides very fast random access (QList::operator[]), whereas QLinkedList<T> has an iterator-based API.

Here's a list of problem functions:

- QValueList(const std::list<T> &) doesn't exist in QList or QLinkedList. You can simulate it by calling append() in a loop.
- QValueList::insert(iterator, size_type, const T& x) doesn't exist in QList or QLinkedList. Call insert() repeatedly instead.
- QValueList::fromLast() doesn't exist in QList or QLinkedList. Use QValueList::end() instead.

  For example, if you have code like

              for (QValueList<T>::iterator i = list.fromLast(); i != list.end(); ++i)
                  do_something(*i);

  you can rewrite it as

              QLinkedList<T>::iterator i = list.end();
              while (i != list.begin()) {
                  --i; // decrement i before using it
                  do_something(*i);
              }

- QValueList::append() and QValueList::prepend() return an iterator to the inserted item. QList's and QLinkedList's corresponding functions don't, but it's not a problem because QValueList::prepend() always returns begin() and append() always returns QValueList::end() - 1.
- QValueList::at(i) return an iterator to the item at index i. This corresponds to QList::begin() + i.
- QValueList::contains(const T &) corresponds to QList::count(const T &) and QLinkedList::count(const T &).

## QValueVector<T>

The QValueVector<T> class has been replaced by QVector<T> in Qt 4. As a help when porting older Qt applications, the Qt 3 compatibility library contains a QValueVector<T> class implemented in terms of the new QVector<T>.

When porting from QValueVector<T> to QVector<T>, you might run into the following incompatibilities:

- QValueVector(const std::vector<T> &) doesn't exist in QVector. You can simulate it by calling QVector::append()} in a loop.
- QValueVector::resize(int, const T &) doesn't exist in QVector. If you want the new items to be initialized with a particular value, use QVector::insert() instead.
- QValueVector::at() on a non-const vector returns a non-const reference. This corresponds to QVector::operator[]().
- Both QValueVector::at() functions have an ok parameter of type `bool *` that is set to true if the index is within bounds. This functionality doesn't exist in QVector; instead, check the index against QVector::size() yourself.

See Generic Containers for an overview of the Qt 4 container classes.

## QVariant

The QVariant class has been split into two classes: QCoreVariant and QVariant. The new QVariant class inherits QCoreVariant and adds GUI-related types. In practice, this has no consequences for existing Qt applications.

In addition, some changes to the rest of the Qt library have implications on QVariant as well:

1. The `QCoreVariant::ColorGroup` enum value is defined only if `QT_COMPAT` is defined.
2. The `QCoreVariant::IconSet` enum value has been renamed `QCoreVariant::Icon`.
3. The `QCoreVariant::CString` enum value is now a synonym for `QCoreVariant::ByteArray`.

## QVBox

The QVBox class has been renamed QVBoxWidget.

## QWhatsThis

The QWhatsThis class has been redesigned in Qt 4. The old `QWhatsThis` class is available as Q3WhatsThis in the Qt 3 compatibility library.

## QWidget

Widget background painting has been greatly improved, supporting flickerfree updates and making it possible to have half transparent widgets. This renders the following background handling functions obsolete:

- QWidget::repaint(bool noErase) - the `noErase` boolean parameter is gone
- QWidget::setBackgroundMode(BackgroundMode m)
- QWidget::backgroundBrush() const
- QWidget::setBackgroundPixmap(const QPixmap &pm)
- QWidget::backgroundPixmap() const
- QWidget::setBackgroundColor(const QColor &c)
- QWidget::backgroundColor() const
- QWidget::foregroundColor() const
- QWidget::eraseColor() const
- QWidget::setEraseColor(const QColor &c)
- QWidget::erasePixmap() const
- QWidget::setErasePixmap(const QPixmap &p)
- QWidget::paletteForegroundColor()
- QWidget::setPaletteForegroundColor(const QColor &c)
- QWidget::paletteBackgroundColor()
- QWidget::setPaletteBackgroundColor(const QColor &c)
- QWidget::paletteBackgroundPixmap() const
- QWidget::setPaletteBackgroundPixmap(const QPixmap &p)
- QWidget::erase()
- QWidget::erase(const QRect &r)
- QWidget::setBackgroundOrigin( BackgroundOrigin )
- QWidget::BackgroundOrigin backgroundOrigin() const
- QWidget::backgroundOffset()

A widget now receives change events in its QWidget::changeEvent() handler. This makes the following virtual change handlers obsolete:

- QWidget::styleChange - use QEvent::StyleChange
- QWidget::enabledChange - use QEvent::EnabledChange
- QWidget::paletteChange - use QEvent::PaletteChange
- QWidget::fontChange - use QEvent::FontChange
- QWidget::windowActivationChange - use QEvent::ActivationChange
- QWidget::languageChange - use QEvent::LanguageChange

The following functions were slots, but are no more:

- QWidget::clearFocus()
- QWidget::setMouseTracking()
- QWidget::stackUnder(QWidget*)
- QWidget::move(int x, int y)
- QWidget::move(const QPoint &)
- QWidget::resize(int w, int h)
- QWidget::resize(const QSize &)
- QWidget::setGeometry(int x, int y, int w, int h)
- QWidget::setGeometry(const QRect &)
- QWidget::adjustSize()
- QWidget::update(int x, int y, int w, int h)
- QWidget::update(const QRect&)
- QWidget::repaint(bool erase)
- QWidget::repaint(int x, int y, int w, int h, bool erase)
- QWidget::repaint(const QRect &, bool erase)
- QWidget::repaint(const QRegion &, bool erase)
- QWidget::setCaption(const QString &)
- QWidget::setIcon(const QPixmap &)
- QWidget::setIconText(const QString &)

The following functions were incorrectly marked as virtual:

- QWidget::close(bool alsoDelete)
- QWidget::create(WId, bool, bool)
- QWidget::destroy(bool)
- QWidget::move(int x, int y)
- QWidget::reparent(QWidget *parent, WFlags, const QPoint &, bool)
- QWidget::resize(int w, int h)
- QWidget::setAcceptDrops(bool on)
- QWidget::setActiveWindow()
- QWidget::setAutoMask(bool)
- QWidget::setBackgroundColor(const QColor &)
- QWidget::setBackgroundMode(BackgroundMode)
- QWidget::setBackgroundOrigin(BackgroundOrigin)
- QWidget::setBackgroundPixmap(const QPixmap &)
- QWidget::setCaption(const QString &)
- QWidget::setCursor(const QCursor &)
- QWidget::setEnabled(bool)
- QWidget::setEraseColor(const QColor &)
- QWidget::setErasePixmap(const QPixmap &)
- QWidget::setFocus()
- QWidget::setFocusPolicy(FocusPolicy)
- QWidget::setFocusProxy(QWidget *)
- QWidget::setFont(const QFont &)
- QWidget::setGeometry(const QRect &)
- QWidget::setGeometry(int x, int y, int w, int h)
- QWidget::setIcon(const QPixmap &)
- QWidget::setIconText(const QString &)
- QWidget::setKeyCompression(bool)
- QWidget::setMask(const QBitmap &)
- QWidget::setMask(const QRegion &)
- QWidget::setMaximumSize(int maxw, int maxh)
- QWidget::setMicroFocusHint(int x, int y, int w, int h, bool, QFont *f)
- QWidget::setMinimumSize(int minw, int minh)
- QWidget::setMouseTracking(bool enable)
- QWidget::setPalette(const QPalette &)
- QWidget::setPaletteBackgroundColor(const QColor &)
- QWidget::setPaletteBackgroundPixmap(const QPixmap &)
- QWidget::setSizeIncrement(int w, int h)
- QWidget::setSizePolicy(QSizePolicy)
- QWidget::setUpdatesEnabled(bool enable)
- QWidget::setWFlags(WFlags)
- QWidget::setWState(uint)
- QWidget::showFullScreen()
- QWidget::showMaximized()
- QWidget::showMinimized()
- QWidget::showNormal()
- QWidget::unsetCursor()

See Properties for a list of QWidget properties in Qt 3 that have changed in Qt 4.

## QWidgetIntDict

The QWidgetIntDict class was a synonym for QIntDict<QWidget>. It is no longer available in Qt 4. If you link against the Qt 3 compatibility library, you can use QIntDict<QWidget> instead; otherwise, see the section on QDict<T>.

## QWidgetList

In Qt 3, the QWidgetList class was a typedef for QPtrList<QWidget>. In Qt 4, it is a typedef for QList<QWidget *>. See the section on QPtrList<T>.

## QWidgetStack

The QWidgetStack class is no longer part of the Qt public API. It has been renamed Q3WidgetStack and moved to the Qt 3 compatibility library. In Qt 4 applications, you can use QStackedWidget instead to obtain the same results.

## QWizard

The `QWizard` class is no longer part of the Qt public API. It has been renamed Q3Wizard and moved to the Qt 3 compatibility library. In Qt 4 applications, you can easily obtain the same result by combining a QStackedBox with a QDialog and provide QPushButtons yourself.

The dialogs/simplewizard and dialogs/complexwizard examples show how to create wizards without using Q3Wizard.

## QWorkspace

The `QWorkspace` class has been renamed Q3Workspace and moved to the Qt 3 compatibility library.

Qt 4.1 is expected to provide a replacement for this class, based on Qt 4's powerful new 2D paint system. If you need MDI functionality in Qt 4.0, you can use Q3Workspace.

## Virtual Functions

Virtual functions that changed their signature in Qt 4:

Qt 3 function signature | Qt 4 function signature
--- | ---
int QAccessibleInterface::navigate(NavDirection, int) const | int QAccessibleInterface::navigate(RelationFlag, int, QAccessibleInterface **) const
bool QApplication::winEventFilter(MSG *) | bool QApplication::winEventFilter(MSG *, long *)
Function: Offset QIODevice::at() const | Function: Q_LONGLONG QIODevice::pos() const
bool QIODevice::at(Offset) | bool QIODevice::seek(Q_LONGLONG)
bool QIODevice::open(int) | bool QIODevice::open(OpenMode)
Q_LONG QIODevice::readBlock(char *, Q_ULONG) | Q_LONGLONG QIODevice::readData(char *, Q_LONGLONG)
Q_LONG QIODevice::writeBlock(const char *, Q_ULONG) | Q_LONGLONG QIODevice::writeData(const char *, Q_LONGLONG)
const char * QImageFormatType::formatName() const | QByteArray QImageFormatType::formatName() const
QPopupMenu * QLineEdit::createPopupMenu() | QMenu * QLineEdit::createPopupMenu()
bool QMacMime::canConvert(const char *, int) | bool QMacMime::canConvert(const QString &, int)
QValueList<QByteArray> QMacMime::convertFromMime(QByteArray, const char *, int) | QList<QByteArray> QMacMime::convertFromMime(QByteArray, const QString &, int)
QByteArray QMacMime::convertToMime(QValueList<QByteArray> data, const char *, int) | QByteArray QMacMime::convertToMime(QList<QByteArray> data, const QString &, int)
const char * QMacMime::convertorName() | QString QMacMime::convertorName()
int QMacMime::flavorFor(const char *) | int QMacMime::flavorFor(const QString &)
const char * QMacMime::mimeFor(int) | QString QMacMime::mimeFor(int)
QMetaObject * QObject::metaObject() const | const QMetaObject * QObject::metaObject() const
bool QScreen::onCard(unsigned char *) const | bool QScreen::onCard(const unsigned char *) const
bool QScreen::onCard(unsigned char *, ulong &) const | bool QScreen::onCard(const unsigned char *, ulong &) const
int QSpinBox::mapTextToValue(bool *) | int QSpinBox::mapTextToValue(QString *, QValidator::State *) const
QString QSpinBox::mapValueToText(int) | QString QSpinBox::mapValueToText(int) const
bool QSqlDriver::open(const QString &, const QString &, const QString &, const QString &, int) | bool QSqlDriver::open(const QString &, const QString &, const QString &, const QString &, int, const QString &)
QStringList QSqlDriver::tables(const QString &) const | QStringList QSqlDriver::tables(QSql::TableType) const
bool QSqlQuery::prev() | bool QSqlQuery::previous()
QVariant QSqlQuery::value(int) const | QCoreVariant QSqlQuery::value(int) const
QVariant QSqlResult::data(int) | QCoreVariant QSqlResult::data(int)
bool QSqlResult::fetchPrev() | bool QSqlResult::fetchPrevious()
void QStyle::drawComplexControl(ComplexControl, QPainter *, const QWidget *, const QRect &, const QColorGroup &, SFlags, SCFlags, SCFlags, const QStyleOption &) const | void QStyle::drawComplexControl(ComplexControl, const QStyleOptionComplex *, QPainter *, const QWidget *) const
void QStyle::drawComplexControlMask(ComplexControl, QPainter *, const QWidget *, const QRect &, const QStyleOption &) const | void QStyle::drawComplexControlMask(ComplexControl, const QStyleOptionComplex *, QPainter *, const QWidget *) const
void QStyle::drawControl(ControlElement, QPainter *, const QWidget *, const QRect &, const QColorGroup &, SFlags, const QStyleOption &) const | void QStyle::drawControl(ControlElement, const QStyleOption *, QPainter *, const QWidget *) const
void QStyle::drawControlMask(ControlElement, QPainter *, const QWidget *, const QRect &, const QStyleOption &) const | void QStyle::drawControlMask(ControlElement, const QStyleOption *, QPainter *, const QWidget *) const
void QStyle::drawItem(QPainter *, const QRect &, int, const QColorGroup &, bool, const QPixmap *, const QString &, int, const QColor *) const | void QStyle::drawItem(QPainter *, const QRect &, int, const QPalette &, bool, const QString &, int, const QColor *) const
void QStyle::drawPrimitive(PrimitiveElement, QPainter *, const QRect &, const QColorGroup &, SFlags, const QStyleOption &) const | void QStyle::drawPrimitive(PrimitiveElement, const QStyleOption *, QPainter *, const QWidget *) const
QRect QStyle::itemRect(QPainter *, const QRect &, int, bool, const QPixmap *, const QString &, int) const | QRect QStyle::itemRect(const QFontMetrics &, const QRect &, int, bool, const QString &, int) const
int QStyle::pixelMetric(PixelMetric, const QWidget *) const | int QStyle::pixelMetric(PixelMetric, const QStyleOption *, const QWidget *) const
SubControl QStyle::querySubControl(ComplexControl, const QWidget *, const QPoint &, const QStyleOption &) const | SubControl QStyle::querySubControl(ComplexControl, const QStyleOptionComplex *, const QPoint &, const QWidget *) const
QRect QStyle::querySubControlMetrics(ComplexControl, const QWidget *, SubControl, const QStyleOption &) const | QRect QStyle::querySubControlMetrics(ComplexControl, const QStyleOptionComplex *, SubControl, const QWidget *) const
QSize QStyle::sizeFromContents(ContentsType, const QWidget *, const QSize &, const QStyleOption &) const | QSize QStyle::sizeFromContents(ContentsType, const QStyleOption *, const QSize &, const QFontMetrics &, const QWidget *) const
int QStyle::styleHint(StyleHint, const QWidget *, const QStyleOption &, QStyleHintReturn *) const | int QStyle::styleHint(StyleHint, const QStyleOption *, const QWidget *, QStyleHintReturn *) const
QPixmap QStyle::stylePixmap(StylePixmap, const QWidget *, const QStyleOption &) const | QPixmap QStyle::standardPixmap(StandardPixmap, const QStyleOption *, const QWidget *) const
QRect QStyle::subRect(SubRect, const QWidget *) const | QRect QStyle::subRect(SubRect, const QStyleOption *, const QFontMetrics &, const QWidget *) const
QCString QTextCodec::fromUnicode(const QString &, int &) const | QByteArray QTextCodec::fromUnicode(const QString &, int &) const
QValueList<int> QTextCodecPlugin::mibEnums() const | QList<int> QTextCodecPlugin::mibEnums() const
void QTextDrag::setSubtype(const QCString &) | void QTextDrag::setSubtype(const QString &)
QCString QTextEncoder::fromUnicode(const QString &, int &) | QByteArray QTextEncoder::fromUnicode(const QString &, int &)
void QUriDrag::setUris(QStrList) | void QUriDrag::setUris(const QList<QByteArray> & list)
void QUrlInfo::setSize(uint) | void QUrlInfo::setSize(Q_LONGLONG)
bool QWindowsMime::canConvert(const char *, int) | bool QWindowsMime::canConvert(const QString &, int)
int QWindowsMime::cfFor(const char *) | int QWindowsMime::cfFor(const QString &)
QByteArray QWindowsMime::convertFromMime(QByteArray, const char *, int) | QByteArray QWindowsMime::convertFromMime(const QByteArray &, const QString &, int)
QByteArray QWindowsMime::convertToMime(QByteArray, const char *, int) | QByteArray QWindowsMime::convertToMime(const QByteArray &, const QString &, int)
const char * QWindowsMime::convertorName() | QString QWindowsMime::convertorName()
void QWSMouseHandler::calibrate(QWSPointerCalibrationData *) | void QWSMouseHandler::calibrate(const QWSPointerCalibrationData *)
bool QWidget::macEvent(MSG *) | bool QWidget::macEvent(EventHandlerCallRef, EventRef)
bool QWidget::winEvent(MSG *) | bool QWidget::winEvent(MSG *, long *)
QString QXmlContentHandler::errorString() | QString QXmlContentHandler::errorString() const
QString QXmlDTDHandler::errorString() | QString QXmlDTDHandler::errorString() const
QString QXmlDeclHandler::errorString() | QString QXmlDeclHandler::errorString() const
QString QXmlEntityResolver::errorString() | QString QXmlEntityResolver::errorString() const
QString QXmlErrorHandler::errorString() | QString QXmlErrorHandler::errorString() const
QString QXmlInputSource::data() | QString QXmlInputSource::data() const
QString QXmlLexicalHandler::errorString() | QString QXmlLexicalHandler::errorString() const
int QXmlLocator::columnNumber() | int QXmlLocator::columnNumber() const
int QXmlLocator::lineNumber() | int QXmlLocator::lineNumber() const

Virtual functions that are not virtual anymore in Qt 4:

Qt 3 function | Comment
--- | ---
void QAccessibleInterface::clearSelection() | Port to the new QAccessibleInterface API.
int QAccessibleInterface::controlAt(int, int) const | Port to the new QAccessibleInterface API.
bool QAccessibleInterface::doDefaultAction(int) | Port to the new QAccessibleInterface API.
QMemArray<int> QAccessibleInterface::selection() const | Port to the new QAccessibleInterface API.
bool QAccessibleInterface::setFocus(int) | Port to the new QAccessibleInterface API.
bool QAccessibleInterface::setSelected(int, bool, bool) | Port to the new QAccessibleInterface API.
bool QAction::addTo(QWidget *) | Use Q3Action instead or port to the new QAction API.
void QAction::addedTo(QWidget *, QWidget *) | Use Q3Action instead or port to the new QAction API.
void QAction::addedTo(int, QPopupMenu *) | Use Q3Action instead or port to the new QAction API.
bool QAction::removeFrom(QWidget *) | Use Q3Action instead or port to the new QAction API.
void QAction::setAccel(const QKeySequence &) | Use Q3Action instead or port to the new QAction API.
void QAction::setEnabled(bool) | Use Q3Action instead or port to the new QAction API.
void QAction::setIconSet(const QIcon &) | Use Q3Action instead or port to the new QAction API.
void QAction::setMenuText(const QString &) | Use Q3Action instead or port to the new QAction API.
void QAction::setOn(bool) | Use Q3Action instead or port to the new QAction API.
void QAction::setStatusTip(const QString &) | Use Q3Action instead or port to the new QAction API.
void QAction::setText(const QString &) | Use Q3Action instead or port to the new QAction API.
void QAction::setToggleAction(bool) | Use Q3Action instead or port to the new QAction API.
void QAction::setToolTip(const QString &) | Use Q3Action instead or port to the new QAction API.
void QAction::setWhatsThis(const QString &) | Use Q3Action instead or port to the new QAction API.
void QButton::drawButton(QPainter *) | Use Q3Button instead or reimplement QButton::paintEvent().
void QButton::drawButtonLabel(QPainter *) | Use Q3Button instead or reimplement QButton::paintEvent().
void QButton::setAccel(const QKeySequence &) | Setter.
void QButton::setAutoRepeat(bool) | Setter.
void QButton::setDown(bool) | Setter.
void QButton::setPixmap(const QPixmap &) | Setter.
void QButton::setState(ToggleState) | Setter.
void QButton::setText(const QString &) | Setter.
void QButton::setToggleType(ToggleType) | Setter.
void QButtonGroup::moveFocus(int) | Setter.
void QButtonGroup::setButton(int) | Setter.
void QButtonGroup::setExclusive(bool) | Setter.
void QButtonGroup::setRadioButtonExclusive(bool) | Setter.
void QComboBox::setAutoCompletion(bool) | Setter.
void QComboBox::setAutoResize(bool) | Setter.
void QComboBox::setCurrentItem(int) | Setter.
void QComboBox::setCurrentText(const QString &) | Setter.
void QComboBox::setFont(const QFont &) | Setter.
void QComboBox::setInsertionPolicy(Policy) | Setter.
void QComboBox::setLineEdit(QLineEdit *) | Setter.
void QComboBox::setListBox(QListBox *) | Setter.
void QComboBox::setMaxCount(int) | Setter.
void QComboBox::setPalette(const QPalette &) | Setter.
void QComboBox::setSizeLimit(int) | Setter.
void QComboBox::setValidator(const QValidator *) | Setter.
void QDateEdit::fix() | Port to the new QDateTimeEdit API.
QString QDateEdit::sectionFormattedText(int) | Port to the new QDateTimeEdit API.
void QDateEdit::setAutoAdvance(bool) | Port to the new QDateTimeEdit API.
void QDateEdit::setDate(const QDate &) | Port to the new QDateTimeEdit API.
void QDateEdit::setDay(int) | Port to the new QDateTimeEdit API.
void QDateEdit::setMaxValue(const QDate &) | Port to the new QDateTimeEdit API.
void QDateEdit::setMinValue(const QDate &) | Port to the new QDateTimeEdit API.
void QDateEdit::setMonth(int) | Port to the new QDateTimeEdit API.
void QDateEdit::setOrder(Order) | Port to the new QDateTimeEdit API.
void QDateEdit::setRange(const QDate &, const QDate &) | Port to the new QDateTimeEdit API.
void QDateEdit::setSeparator(const QString &) | Port to the new QDateTimeEdit API.
void QDateEdit::setYear(int) | Port to the new QDateTimeEdit API.
void QDateTimeEdit::setAutoAdvance(bool) | Port to the new QDateTimeEdit API.
void QDateTimeEdit::setDateTime(const QDateTime &) | Port to the new QDateTimeEdit API.
void QDial::rangeChange() | Reimplement QDial::sliderChange() instead.
void QDial::repaintScreen(const QRect *) | Reimplement QDial::paintEvent() instead.
void QDial::setNotchTarget(double) | Setter.
void QDial::setNotchesVisible(bool) | Setter.
void QDial::setTracking(bool) | Setter.
void QDial::setValue(int) | Use QDial::sliderChange() instead.
void QDial::setWrapping(bool) | Setter.
void QDial::valueChange() | Use QDial::sliderChange() instead.
QString QDir::absFilePath(const QString &, bool) const | Value type.
QString QDir::absPath() const | Value type.
QString QDir::canonicalPath() const | Value type.
bool QDir::cd(const QString &, bool) | Value type.
bool QDir::cdUp() | Value type.
void QDir::convertToAbs() | Value type.
QString QDir::dirName() const | Value type.
QStrList QDir::encodedEntryList(int, int) const | Value type.
QStrList QDir::encodedEntryList(const QString &, int, int) const | Value type.
const QFileInfoList * QDir::entryInfoList(int, int) const | Value type.
const QFileInfoList * QDir::entryInfoList(const QString &, int, int) const | Value type.
QStringList QDir::entryList(const QString &, int, int) const | Value type.
QStringList QDir::entryList(int, int) const | Value type.
bool QDir::exists() const | Value type.
bool QDir::exists(const QString &, bool) | Value type.
QString QDir::filePath(const QString &, bool) const | Value type.
bool QDir::isReadable() const | Value type.
bool QDir::isRelative() const | Value type.
bool QDir::isRoot() const | Value type.
bool QDir::mkdir(const QString &, bool) const | Value type.
bool QDir::operator!=() const | Value type.
bool QDir::operator==() const | Value type.
QString QDir::path() const | Value type.
bool QDir::remove(const QString &, bool) | Value type.
bool QDir::rename(const QString &, const QString &, bool) | Value type.
bool QDir::rmdir(const QString &, bool) const | Value type.
void QDir::setFilter(int) | Value type.
void QDir::setMatchAllDirs(bool) | Value type.
void QDir::setNameFilter(const QString &) | Value type.
void QDir::setPath(const QString &) | Value type.
void QDir::setSorting(int) | Value type.
void QDns::setLabel(const QString &) | Use Q3Dns instead.
void QDns::setLabel(const QHostAddress &) | Use Q3Dns instead.
void QDns::setRecordType(RecordType) | Use Q3Dns instead.
void QDockWindow::dock() | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setCloseMode(int) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setFixedExtentHeight(int) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setFixedExtentWidth(int) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setHorizontallyStretchable(bool) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setMovingEnabled(bool) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setNewLine(bool) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setOffset(int) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setOpaqueMoving(bool) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setOrientation(Orientation) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setResizeEnabled(bool) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setVerticallyStretchable(bool) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::setWidget(QWidget *) | Use Q3DockWindow instead or port to the new QDockWindow API.
void QDockWindow::undock() | Use Q3DockWindow instead or port to the new QDockWindow API.
QString QDomAttr::name() const | Value type.
QDomElement QDomAttr::ownerElement() const | Value type.
void QDomAttr::setValue(const QString &) | Value type.
bool QDomAttr::specified() const | Value type.
QString QDomAttr::value() const | Value type.
void QDomCharacterData::appendData(const QString &) | Value type.
QString QDomCharacterData::data() const | Value type.
void QDomCharacterData::deleteData(unsigned, unsigned) | Value type.
void QDomCharacterData::insertData(unsigned, const QString &) | Value type.
uint QDomCharacterData::length() const | Value type.
void QDomCharacterData::replaceData(unsigned, unsigned, const QString &) | Value type.
void QDomCharacterData::setData(const QString &) | Value type.
QString QDomCharacterData::substringData(unsigned, unsigned) | Value type.
QDomNamedNodeMap QDomDocumentType::entities() const | Value type.
QString QDomDocumentType::internalSubset() const | Value type.
QString QDomDocumentType::name() const | Value type.
QDomNamedNodeMap QDomDocumentType::notations() const | Value type.
QString QDomDocumentType::publicId() const | Value type.
QString QDomDocumentType::systemId() const | Value type.
QDomNamedNodeMap QDomElement::attributes() const | Value type.
QDomNodeList QDomElement::elementsByTagName(const QString &) const | Value type.
QDomNodeList QDomElement::elementsByTagNameNS(const QString &, const QString &) const | Value type.
QString QDomEntity::notationName() const | Value type.
QString QDomEntity::publicId() const | Value type.
QString QDomEntity::systemId() const | Value type.
QDomDocument QDomImplementation::createDocument(const QString &, const QString &, const QDomDocumentType &) | Value type.
QDomDocumentType QDomImplementation::createDocumentType(const QString &, const QString &, const QString &) | Value type.
bool QDomImplementation::hasFeature(const QString &, const QString &) | Value type.
QDomImplementation::~QDomImplementation() | Value type.
QDomNode QDomNode::appendChild(const QDomNode &) | Value type.
QDomNamedNodeMap QDomNode::attributes() const | Value type.
QDomNodeList QDomNode::childNodes() const | Value type.
QDomNode QDomNode::cloneNode(bool) const | Value type.
QDomNode QDomNode::firstChild() const | Value type.
bool QDomNode::hasAttributes() const | Value type.
bool QDomNode::hasChildNodes() const | Value type.
QDomNode QDomNode::insertAfter(const QDomNode &, const QDomNode &) | Value type.
QDomNode QDomNode::insertBefore(const QDomNode &, const QDomNode &) | Value type.
bool QDomNode::isAttr() const | Value type.
bool QDomNode::isCDATASection() const | Value type.
bool QDomNode::isCharacterData() const | Value type.
bool QDomNode::isComment() const | Value type.
bool QDomNode::isDocument() const | Value type.
bool QDomNode::isDocumentFragment() const | Value type.
bool QDomNode::isDocumentType() const | Value type.
bool QDomNode::isElement() const | Value type.
bool QDomNode::isEntity() const | Value type.
bool QDomNode::isEntityReference() const | Value type.
bool QDomNode::isNotation() const | Value type.
bool QDomNode::isProcessingInstruction() const | Value type.
bool QDomNode::isSupported(const QString &, const QString &) const | Value type.
bool QDomNode::isText() const | Value type.
QDomNode QDomNode::lastChild() const | Value type.
QString QDomNode::localName() const | Value type.
QString QDomNode::namespaceURI() const | Value type.
QDomNode QDomNode::nextSibling() const | Value type.
QString QDomNode::nodeName() const | Value type.
QDomNode::NodeType QDomNode::nodeType() const | Value type.
QString QDomNode::nodeValue() const | Value type.
void QDomNode::normalize() | Value type.
QDomDocument QDomNode::ownerDocument() const | Value type.
QDomNode QDomNode::parentNode() const | Value type.
QString QDomNode::prefix() const | Value type.
QDomNode QDomNode::previousSibling() const | Value type.
QDomNode QDomNode::removeChild(const QDomNode &) | Value type.
QDomNode QDomNode::replaceChild(const QDomNode &, const QDomNode &) | Value type.
void QDomNode::setNodeValue(const QString &) | Value type.
void QDomNode::setPrefix(const QString &) | Value type.
QDomNode::~QDomNode() | Value type.
QDomNode QDomNodeList::item(int) const | Value type.
uint QDomNodeList::length() const | Value type.
QDomNodeList::~QDomNodeList() | Value type.
QString QDomProcessingInstruction::data() const | Value type.
void QDomProcessingInstruction::setData(const QString &) | Value type.
QString QDomProcessingInstruction::target() const | Value type.
int QEventLoop::enterLoop() | Port to the new QAbstractEventDispatcher API.
int QEventLoop::exec() | Port to the new QAbstractEventDispatcher API.
void QEventLoop::exit(int) | Port to the new QAbstractEventDispatcher API.
void QEventLoop::exitLoop() | Port to the new QAbstractEventDispatcher API.
bool QEventLoop::hasPendingEvents() const | Port to the new QAbstractEventDispatcher API.
int QEventLoop::loopLevel() const | Port to the new QAbstractEventDispatcher API.
bool QEventLoop::processEvents(ProcessEventsFlags) | Port to the new QAbstractEventDispatcher API.
void QEventLoop::registerSocketNotifier(QSocketNotifier *) | Port to the new QAbstractEventDispatcher API.
void QEventLoop::unregisterSocketNotifier(QSocketNotifier *) | Port to the new QAbstractEventDispatcher API.
void QEventLoop::wakeUp() | Port to the new QAbstractEventDispatcher API.
void QFrame::drawContents(QPainter *) | Use Q3Frame or reimplement QFrame::paintEvent() instead.
void QFrame::drawFrame(QPainter *) | Use Q3Frame or reimplement QFrame::paintEvent() instead.
void QFrame::frameChanged() | Use Q3Frame or reimplement QFrame::resizeEvent() instead.
void QFrame::setFrameRect(const QRect &) | Setter.
void QFrame::setFrameStyle(int) | Setter.
void QFrame::setLineWidth(int) | Setter.
void QFrame::setMargin(int) | Setter.
void QFrame::setMidLineWidth(int) | Setter.
void QGridLayout::setColStretch(int, int) | Setter.
void QGridLayout::setRowStretch(int, int) | Setter.
void QGroupBox::setAlignment(int) | Setter.
void QGroupBox::setColumnLayout(int, Orientation) | Setter.
void QGroupBox::setTitle(const QString &) | Setter.
QHostAddress::~QHostAddress() | Value type.
int QIODevice::getch() | Port to the new QIODevice API.
int QIODevice::putch(int) | Port to the new QIODevice API.
QByteArray QIODevice::readAll() | Port to the new QIODevice API.
Q_LONG QIODevice::readLine(char *, Q_ULONG) | Port to the new QIODevice API.
int QIODevice::ungetch(int) | Port to the new QIODevice API.
void QIcon::setPixmap(const QString &, Size, Mode, State) | Value type.
void QIcon::setPixmap(const QPixmap &, Size, Mode, State) | Value type.
QIcon::~QIcon() | Value type.
void QLabel::setAlignment(int) | Setter.
void QLabel::setAutoResize(bool) | Setter.
void QLabel::setBuddy(QWidget *) | Setter.
void QLabel::setMovie(const QMovie &) | Setter.
void QLabel::setNum(int) | Setter.
void QLabel::setNum(double) | Setter.
void QLabel::setPicture(const QPicture &) | Setter.
void QLabel::setPixmap(const QPixmap &) | Setter.
void QLabel::setText(const QString &) | Setter.
QLayoutIterator QLayout::iterator() | Port to the new QLayout API.
void QLayout::setAutoAdd(bool) | Setter.
void QLayout::setMargin(int) | Setter.
void QLayout::setMenuBar(QMenuBar *) | Setter.
void QLayout::setSpacing(int) | Setter.
QLayoutIterator QLayoutItem::iterator() | Port to the new QLayoutItem API.
void QLayoutItem::setAlignment(int) | Setter.
bool QLibrary::unload() | Never used polymorphically in Qt.
void QLineEdit::clear() | Connect to QLineEdit::textChanged() instead.
void QLineEdit::clearValidator() | Never used polymorphically in Qt.
void QLineEdit::copy() const | Never used polymorphically in Qt.
void QLineEdit::cut() | Never used polymorphically in Qt.
void QLineEdit::deselect() | Connect to QLineEdit::selectionChanged() instead.
void QLineEdit::insert(const QString &) | Connect to QLineEdit::textChanged() instead.
void QLineEdit::paste() | Connect to QLineEdit::textChanged() instead.
void QLineEdit::redo() | Never used polymorphically in Qt.
void QLineEdit::selectAll() | Connect to QLineEdit::selectionChanged() instead.
void QLineEdit::setAlignment(int) | Setter.
void QLineEdit::setCursorPosition(int) | Connect to QLineEdit::cursorPositionChanged() instead.
void QLineEdit::setDragEnabled(bool) | Setter.
void QLineEdit::setEchoMode(EchoMode) | Setter.
void QLineEdit::setFrame(bool) | Setter.
void QLineEdit::setMaxLength(int) | Setter.
void QLineEdit::setReadOnly(bool) | Setter.
void QLineEdit::setSelection(int, int) | Connect to QLineEdit::selectionChanged() instead.
void QLineEdit::setText(const QString &) | Connect to QLineEdit::textChanged() instead.
void QLineEdit::setValidator(const QValidator *) | Setter.
void QLineEdit::undo() | Never used in a polymorphic way by Qt.
void QMainWindow::addDockWindow(QDockWindow *, Dock, bool) | Port to the new QMainWindow API.
void QMainWindow::addDockWindow(QDockWindow *, const QString &, Dock, bool) | Port to the new QMainWindow API.
void QMainWindow::customize() | Port to the new QMainWindow API.
bool QMainWindow::isCustomizable() const | Port to the new QMainWindow API.
void QMainWindow::moveDockWindow(QDockWindow *, Dock) | Port to the new QMainWindow API.
void QMainWindow::moveDockWindow(QDockWindow *, Dock, bool, int, int) | Port to the new QMainWindow API.
void QMainWindow::removeDockWindow(QDockWindow *) | Port to the new QMainWindow API.
void QMainWindow::setAppropriate(QDockWindow *, bool) | Port to the new QMainWindow API.
void QMainWindow::setCentralWidget(QWidget *) | Setter.
void QMainWindow::setDockEnabled(QDockWindow *, Dock, bool) | Port to the new QMainWindow API.
void QMainWindow::setDockEnabled(Dock, bool) | Port to the new QMainWindow API.
void QMainWindow::setDockMenuEnabled(bool) | Port to the new QMainWindow API.
void QMainWindow::setDockWindowsMovable(bool) | Port to the new QMainWindow API.
void QMainWindow::setOpaqueMoving(bool) | Port to the new QMainWindow API.
void QMainWindow::setRightJustification(bool) | Port to the new QMainWindow API.
void QMainWindow::setUpLayout() | Port to the new QMainWindow API.
void QMainWindow::setUsesBigPixmaps(bool) | Port to the new QMainWindow API.
void QMainWindow::setUsesTextLabel(bool) | Port to the new QMainWindow API.
bool QMainWindow::showDockMenu(const QPoint &) | Port to the new QMainWindow API.
void QMenuBar::activateItemAt(int) | Port to the new QMenuBar API.
void QMenuBar::menuContentsChanged() | Port to the new QMenuBar API.
void QMenuBar::menuDelPopup(QPopupMenu *) | Port to the new QMenuBar API.
void QMenuBar::menuInsPopup(QPopupMenu *) | Port to the new QMenuBar API.
void QMenuBar::menuStateChanged() | Port to the new QMenuBar API.
void QMenuBar::setId(int, int) | Port to the new QMenuBar API.
void QMenuBar::setSeparator(Separator) | Port to the new QMenuBar API.
void QMenuBar::updateItem(int) | Port to the new QMenuBar API.
QMutex::~QMutex() | Value type.
bool QObject::checkConnectArgs(const char *, const QObject *, const char *) | Reimplementing this function is no longer possible.
const char * QObject::className() const | Reimplementing this function is no longer supported.
void QObject::insertChild(QObject *) | Reimplement QObject::childEvent() instead and handle QEvent:ChildAdded events.
QVariant QObject::property(const char *) const | Reimplementing this function is no longer supported.
void QObject::removeChild(QObject *) | Reimplement QObject::childEvent() instead and handle QEvent:ChildRemoved events.
void QObject::setName(const char *) | Setter.
bool QObject::setProperty(const char *, const QVariant &) | Setter.
bool QPaintDevice::cmd(int , QPainter * , QPDevCmdParam *) | Port to the new QPaintEngine API.
Qt::HANDLE QPaintDevice::handle() const | Port to the new QPaintDevice API.
HDC QPaintDevice::handle() const | Port to the new QPaintDevice API.
void QPopupMenu::activateItemAt(int) | Port to the new QMenu API.
void QPopupMenu::menuContentsChanged() | Port to the new QMenu API.
void QPopupMenu::menuDelPopup(QPopupMenu *) | Port to the new QMenu API.
void QPopupMenu::menuInsPopup(QPopupMenu *) | Port to the new QMenu API.
void QPopupMenu::menuStateChanged() | Port to the new QMenu API.
void QPopupMenu::setActiveItem(int) | Port to the new QMenu API.
void QPopupMenu::setCheckable(bool) | Port to the new QMenu API.
void QPopupMenu::setId(int, int) | Port to the new QMenu API.
void QPopupMenu::updateItem(int) | Port to the new QMenu API.
int QPrinter::resolution() const | Call QPrinter::setResolution() to change the resolution.
void QPrinter::setColorMode(ColorMode) | Subclass QPrintEngine instead.
void QPrinter::setCreator(const QString &) | Subclass QPrintEngine instead.
void QPrinter::setDocName(const QString &) | Subclass QPrintEngine instead.
void QPrinter::setFromTo(int, int) | Subclass QPrintEngine instead.
void QPrinter::setFullPage(bool) | Subclass QPrintEngine instead.
void QPrinter::setMinMax(int, int) | Subclass QPrintEngine instead.
void QPrinter::setNumCopies(int) | Subclass QPrintEngine instead.
void QPrinter::setOrientation(Orientation) | Subclass QPrintEngine instead.
void QPrinter::setOutputFileName(const QString &) | Subclass QPrintEngine instead.
void QPrinter::setOutputToFile(bool) | Subclass QPrintEngine instead.
void QPrinter::setPageOrder(PageOrder) | Subclass QPrintEngine instead.
void QPrinter::setPageSize(PageSize) | Subclass QPrintEngine instead.
void QPrinter::setPaperSource(PaperSource) | Subclass QPrintEngine instead.
void QPrinter::setPrintProgram(const QString &) | Subclass QPrintEngine instead.
void QPrinter::setPrinterName(const QString &) | Subclass QPrintEngine instead.
void QPrinter::setPrinterSelectionOption(const QString &) | Subclass QPrintEngine instead.
void QPrinter::setResolution(int) | Subclass QPrintEngine instead.
void QProcess::addArgument(const QString &) | Not used polymorphically in Qt.
void QProcess::closeStdin() | Not used polymorphically in Qt.
bool QProcess::launch(const QByteArray & buf, QStringList *) | Not used polymorphically in Qt.
bool QProcess::launch(const QString & buf, QStringList *) | Not used polymorphically in Qt.
QString QProcess::readLineStderr() | Not used polymorphically in Qt.
QString QProcess::readLineStdout() | Not used polymorphically in Qt.
QByteArray QProcess::readStderr() | Not used polymorphically in Qt.
QByteArray QProcess::readStdout() | Not used polymorphically in Qt.
void QProcess::setArguments(const QStringList &) | Not used polymorphically in Qt.
void QProcess::setWorkingDirectory(const QDir &) | Not used polymorphically in Qt.
bool QProcess::start(QStringList *) | Not used polymorphically in Qt.
void QProcess::writeToStdin(const QByteArray &) | Not used polymorphically in Qt.
bool QProgressBar::setIndicator(QString &, int, int) | Not used polymorphically in Qt.
void QProgressBar::setProgress(int) | Not used polymorphically in Qt.
void QProgressBar::setTotalSteps(int) | Not used polymorphically in Qt.
void QPushButton::setAutoDefault(bool) | Not used polymorphically in Qt.
void QPushButton::setDefault(bool) | Not used polymorphically in Qt.
void QPushButton::setIsMenuButton(bool) | Not used polymorphically in Qt.
void QPushButton::setOn(bool) | Connect to QPushButton::toggled(bool) instead.
void QRadioButton::setChecked(bool) | Connect to QRadioButton::toggled(bool) instead.
uchar * QScreen::cache(int , int) | Port to the new QScreen API.
void QScreen::set(unsigned int , unsigned int , unsigned int , unsigned) | Port to the new QScreen API.
void QScreen::uncache(uchar *) | Port to the new QScreen API.
void QScrollBar::setOrientation(Orientation) | Setter.
void QScrollBar::setTracking(bool) | Setter.
void QSignalMapper::setMapping(const QObject *, const QString &) | Setter.
void QSignalMapper::setMapping(const QObject *, int) | Setter.
void QSlider::rangeChange() | Reimplement QSlider::sliderChange() instead.
void QSlider::setOrientation(Orientation) | Setter.
void QSlider::setPalette(const QPalette &) | Setter.
void QSlider::setTickInterval(int) | Setter.
void QSlider::setTickmarks(TickSetting) | Setter.
void QSlider::setTracking(bool) | Setter.
void QSlider::setValue(int) | Reimplement QSlider::sliderChange() instead.
void QSlider::valueChange() | Reimplement QSlider::sliderChange() instead.
QString QSpinBox::cleanText() const | Port to the new QSpinBox API.
void QSpinBox::interpretText() | Port to the new QSpinBox API.
QString QSpinBox::prefix() const | Port to the new QSpinBox API.
void QSpinBox::rangeChange() | Reimplement QSpinBox::sliderChange() instead.
void QSpinBox::selectAll() | Port to the new QSpinBox API.
void QSpinBox::setButtonSymbols(ButtonSymbols) | Setter.
void QSpinBox::setPrefix(const QString &) | Setter.
void QSpinBox::setSpecialValueText(const QString &) | Setter.
void QSpinBox::setSuffix(const QString &) | Setter.
void QSpinBox::setValidator(const QValidator *) | Setter.
void QSpinBox::setValue(int) | Connect to QSpinBox::valueChanged().
void QSpinBox::setWrapping(bool) | Setter.
void QSpinBox::stepDown() | Reimplement QSpinBox::stepBy() instead.
void QSpinBox::stepUp() | Reimplement QSpinBox::stepBy() instead.
QString QSpinBox::suffix() const | Port to the new QSpinBox API.
void QSpinBox::updateDisplay() | Port to the new QSpinBox API.
void QSpinBox::valueChange() | Reimplement QSpinBox::sliderChange() instead.
void QSplitter::drawSplitter(QPainter *, QCOORD, QCOORD, QCOORD, QCOORD) | Reimplement QStyle::drawPrimitive() instead and handle QStyle::PE_Splitter.
void QSplitter::setOpaqueResize(bool) | Setter.
void QSplitter::setOrientation(Orientation) | Setter.
void QSplitter::setResizeMode(QWidget *, ResizeMode) | Setter.
void QSqlDatabase::setDatabaseName(const QString &) | Setter.
void QSqlDatabase::setHostName(const QString &) | Setter.
void QSqlDatabase::setPassword(const QString &) | Setter.
void QSqlDatabase::setPort(int) | Setter.
void QSqlDatabase::setUserName(const QString &) | Setter.
QSqlQuery QSqlDriver::createQuery() const | Port to the new QSqlDriver API.
QString QSqlDriver::nullText() const | Port to the new QSqlDriver API.
QSqlRecord QSqlDriver::record(const QSqlQuery &) const | Port to the new QSqlDriver API.
QSqlRecordInfo QSqlDriver::recordInfo(const QSqlQuery &) const | Port to the new QSqlDriver API.
QSqlRecordInfo QSqlDriver::recordInfo(const QString &) const | Port to the new QSqlDriver API.
void QSqlError::setDatabaseText(const QString &) | Value type.
void QSqlError::setDriverText(const QString &) | Value type.
void QSqlError::setNumber(int) | Value type.
void QSqlError::setType(int) | Value type.
QSqlError::~QSqlError() | Value type.
void QSqlField::setName(const QString &) | Value type.
void QSqlField::setNull() | Value type.
void QSqlField::setReadOnly(bool) | Value type.
void QSqlField::setValue(const QVariant &) | Value type.
QVariant QSqlField::value() const | Value type.
QSqlField::~QSqlField() | Value type.
void QSqlFieldInfo::setCalculated(bool) | Value type.
void QSqlFieldInfo::setGenerated(bool) | Value type.
void QSqlFieldInfo::setTrim(bool) | Value type.
QSqlFieldInfo::~QSqlFieldInfo() | Value type.
void QSqlIndex::append(const QSqlField &) | Value type.
void QSqlIndex::append(const QSqlField &, bool) | Value type.
void QSqlIndex::setCursorName(const QString &) | Value type.
void QSqlIndex::setDescending(int, bool) | Value type.
void QSqlIndex::setName(const QString &) | Value type.
void QSqlRecord::append(const QSqlField &) | Value type.
void QSqlRecord::clear() | Value type.
void QSqlRecord::clearValues(bool) | Value type.
void QSqlRecord::insert(int, const QSqlField &) | Value type.
void QSqlRecord::remove(int) | Value type.
void QSqlRecord::setGenerated(const QString &, bool) | Value type.
void QSqlRecord::setGenerated(int, bool) | Value type.
void QSqlRecord::setNull(int) | Value type.
void QSqlRecord::setNull(const QString &) | Value type.
void QSqlRecord::setValue(const QString &, const QVariant &) | Value type.
void QSqlRecord::setValue(int, const QVariant &) | Value type.
QString QSqlRecord::toString(const QString &, const QString &) const | Value type.
QStringList QSqlRecord::toStringList(const QString &) const | Value type.
QVariant QSqlRecord::value(int) const | Value type.
QVariant QSqlRecord::value(const QString &) const | Value type.
QSqlRecord::~QSqlRecord() | Value type.
void QStyle::polishPopupMenu(QPopupMenu *) | Reimplement QStyle::polish(QWidget *) instead.
int QTabBar::addTab(QTab *) | Reimplement QTabBar::tabInserted() instead.
int QTabBar::insertTab(QTab *, int) | Reimplement QTabBar::tabInserted() instead.
void QTabBar::layoutTabs() | Reimplement QTabBar::tabLayoutChange() instead.
void QTabBar::paint(QPainter *, QTab *, bool) const | Reimplement QTabBar::paintEvent() instead.
void QTabBar::paintLabel(QPainter *, const QRect &, QTab *, bool) const | Reimplement QTabBar::paintEvent() instead.
void QTabBar::removeTab(QTab *) | Reimplement QTabBar::tabRemoved() instead.
QTab * QTabBar::selectTab(const QPoint &) const | Reimplement QTabBar::mousePressEvent() instead.
void QTabBar::setCurrentTab(int) | Connect to the QTabBar::currentChanged() signal.
void QTabBar::setCurrentTab(QTab *) | Connect to the QTabBar::currentChanged() signal.
void QTabBar::setShape(Shape) | Setter.
void QTabBar::setTabEnabled(int, bool) | Setter.
void QTabWidget::addTab(QWidget *, const QString &) | Reimplement QTabWidget::tabInserted() instead.
void QTabWidget::addTab(QWidget *, const QIcon &, const QString &) | Reimplement QTabWidget::tabInserted() instead.
void QTabWidget::addTab(QWidget *, QTab *) | Reimplement QTabWidget::tabInserted() instead.
void QTabWidget::insertTab(QWidget *, const QIcon &, const QString &, int) | Reimplement QTabWidget::tabInserted() instead.
void QTabWidget::insertTab(QWidget *, const QString &, int) | Reimplement QTabWidget::tabInserted() instead.
void QTabWidget::insertTab(QWidget *, QTab *, int) | Reimplement QTabWidget::tabInserted() instead.
void QTabWidget::removePage(QWidget *) | Reimplement QTabWidget::tabRemoved() instead.
void QTabWidget::showPage(QWidget *) | Connect to QTabWidget::currentChanged() instead.
void QTextEdit::append(const QString &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::clear() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::clearParagraphBackground(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::copy() | Use Q3TextEdit or port to the new QTextEdit API.
QPopupMenu * QTextEdit::createPopupMenu(const QPoint &) | Use Q3TextEdit or port to the new QTextEdit API.
QPopupMenu * QTextEdit::createPopupMenu() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::cut() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::del() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::doKeyboardAction(KeyboardAction) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::ensureCursorVisible() | Use Q3TextEdit or port to the new QTextEdit API.
bool QTextEdit::find(const QString &, bool, bool, bool, int *, int *) | Use Q3TextEdit or port to the new QTextEdit API.
bool QTextEdit::focusNextPrevChild(bool) | Use Q3TextEdit or port to the new QTextEdit API.
int QTextEdit::heightForWidth(int) const | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::insert(const QString &, bool, bool, bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::insertAt(const QString &, int, int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::insertParagraph(const QString &, int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::moveCursor(CursorAction, bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::paste() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::pasteSubType(const QCString &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::placeCursor(const QPoint &, QTextCursor *) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::redo() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::removeParagraph(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::removeSelectedText(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::removeSelection(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::scrollToAnchor(const QString &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::scrollToBottom() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::selectAll(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setAlignment(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setBold(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setColor(const QColor &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setCurrentFont(const QFont &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setCursorPosition(int, int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setFamily(const QString &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setItalic(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setLinkUnderline(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setMimeSourceFactory(QMimeSourceFactory *) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setModified(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setOverwriteMode(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setPaper(const QBrush &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setParagraphBackgroundColor(int, const QColor &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setPointSize(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setReadOnly(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setSelection(int, int, int, int, int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setSelectionAttributes(int, const QColor &, bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setStyleSheet(QStyleSheet *) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setTabStopWidth(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setText(const QString &, const QString &) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setTextFormat(TextFormat) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setUnderline(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setUndoDepth(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setUndoRedoEnabled(bool) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setVerticalAlignment(VerticalAlignment) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setWordWrap(WordWrap) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setWrapColumnOrWidth(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::setWrapPolicy(WrapPolicy) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::sync() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::undo() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::zoomIn() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::zoomIn(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::zoomOut(int) | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::zoomOut() | Use Q3TextEdit or port to the new QTextEdit API.
void QTextEdit::zoomTo(int) | Use Q3TextEdit or port to the new QTextEdit API.
QString QTimeEdit::sectionFormattedText(int) | Port to the new QDateTimeEdit API.
void QTimeEdit::setAutoAdvance(bool) | Port to the new QDateTimeEdit API.
void QTimeEdit::setHour(int) | Port to the new QDateTimeEdit API.
void QTimeEdit::setMaxValue(const QTime &) | Port to the new QDateTimeEdit API.
void QTimeEdit::setMinValue(const QTime &) | Port to the new QDateTimeEdit API.
void QTimeEdit::setMinute(int) | Port to the new QDateTimeEdit API.
void QTimeEdit::setRange(const QTime &, const QTime &) | Port to the new QDateTimeEdit API.
void QTimeEdit::setSecond(int) | Port to the new QDateTimeEdit API.
void QTimeEdit::setSeparator(const QString &) | Port to the new QDateTimeEdit API.
void QTimeEdit::setTime(const QTime &) | Port to the new QDateTimeEdit API.
void QToolBar::clear() | Setter.
void QToolBar::setLabel(const QString &) | Setter.
void QToolBar::setStretchableWidget(QWidget *) | Setter.
void QToolButton::setIconSet(const QIcon &) | Setter.
void QToolButton::setOn(bool) | Connect to QToolButton::toggled(bool) instead.
void QToolButton::setTextLabel(const QString &, bool) | Setter.
void QToolButton::setToggleButton(bool) | Setter.
void QToolButton::setUsesBigPixmap(bool) | Setter.
void QToolButton::setUsesTextLabel(bool) | Setter.
void QToolTip::maybeTip(const QPoint &) | Port to the new QToolTip API.
void QUrl::addPath(const QString &) | Value type.
bool QUrl::cdUp() | Value type.
bool QUrl::parse(const QString &) | Value type.
void QUrl::reset() | Value type.
void QUrl::setEncodedPathAndQuery(const QString &) | Value type.
void QUrl::setFileName(const QString &) | Value type.
void QUrl::setHost(const QString &) | Value type.
void QUrl::setPassword(const QString &) | Value type.
void QUrl::setPath(const QString &) | Value type.
void QUrl::setPort(int) | Value type.
void QUrl::setProtocol(const QString &) | Value type.
void QUrl::setQuery(const QString &) | Value type.
void QUrl::setRef(const QString &) | Value type.
void QUrl::setUser(const QString &) | Value type.
QString QUrl::toString(bool, bool) const | Value type.
QUrl::~QUrl() | Value type.
QWaitCondition::~QWaitCondition() | Value type.
bool QWhatsThis::clicked(const QString &) | Port to the new QWhatsThis API.
QString QWhatsThis::text(const QPoint &) | Port to the new QWhatsThis API.
QWhatsThis::~QWhatsThis() | Port to the new QSpinBox API.
void QWidget::adjustSize() | Reimplement QWidget::sizeHint() instead.
bool QWidget::close(bool) | Reimplement QWidget::closeEvent().
void QWidget::create(WId, bool, bool) | Not supported in Qt 4.
bool QWidget::customWhatsThis() const | Not supported in Qt 4.
void QWidget::destroy(bool, bool) | Not supported in Qt 4.
void QWidget::enabledChange(bool) | Reimplement QWidget::changeEvent() and handle QEvent::EnabledChange.
void QWidget::fontChange(const QFont &) | Reimplement QWidget::changeEvent() and handle QEvent::FontChange.
void QWidget::imComposeEvent(QIMEvent *) | Reimplement QWidget::inputMethodEvent() instead.
void QWidget::imEndEvent(QIMEvent *) | Reimplement QWidget::inputMethodEvent() instead.
void QWidget::imStartEvent(QIMEvent *) | Reimplement QWidget::inputMethodEvent() instead.
void QWidget::move(int, int) | Setter.
void QWidget::paletteChange(const QPalette &) | Reimplement QWidget::changeEvent() and handle QEvent::PaletteChange and/or QEvent::ApplicationPaletteChange.
void QWidget::polish() | Reimplement QWidget::polishEvent() instead.
void QWidget::reparent(QWidget *, WFlags, const QPoint &, bool) | Reimplement QWidget::event() and handle QEvent::Reparent.
void QWidget::resize(int, int) | Reimplement QWidget::resizeEvent() instead.
void QWidget::setAcceptDrops(bool) | Setter.
void QWidget::setActiveWindow() | Reimplement QWidget::changeEvent() and handle QEvent::ActivationChange.
void QWidget::setAutoMask(bool) | Setter.
void QWidget::setBackgroundColor(const QColor &) | Setter.
void QWidget::setBackgroundMode(BackgroundMode) | Setter.
void QWidget::setBackgroundOrigin(BackgroundOrigin) | Setter.
void QWidget::setBackgroundPixmap(const QPixmap &) | Setter.
void QWidget::setCaption(const QString &) | Reimplement QWidget::changeEvent() and handle QEvent::WindowTitleChange.
void QWidget::setCursor(const QCursor &) | Setter.
void QWidget::setEnabled(bool) | Reimplement QWidget::changeEvent() and handle QEvent::EnabledChange.
void QWidget::setEraseColor(const QColor &) | Setter.
void QWidget::setErasePixmap(const QPixmap &) | Setter.
void QWidget::setFocus() | Reimplement QWidget::focusInEvent() or QWidget::focusOutEvent().
void QWidget::setFocusPolicy(FocusPolicy) | Setter.
void QWidget::setFocusProxy(QWidget *) | Setter.
void QWidget::setFont(const QFont &) | Reimplement QWidget::changeEvent() and handle QEvent::FontChange and/or QEvent::ApplicationFontChange.
void QWidget::setGeometry(int, int, int, int) | Setter.
void QWidget::setGeometry(const QRect &) | Setter.
void QWidget::setIcon(const QPixmap &) | Reimplement QWidget::changeEvent() and handle QEvent::WindowIconChange.
void QWidget::setIconText(const QString &) | Reimplement QWidget::changeEvent() and handle QEvent::IconTextChange.
void QWidget::setKeyCompression(bool) | Setter.
void QWidget::setMask(const QRegion &) | Setter.
void QWidget::setMask(const QBitmap &) | Setter.
void QWidget::setMaximumSize(int, int) | Setter.
void QWidget::setMicroFocusHint(int, int, int, int, bool, QFont *) | Setter.
void QWidget::setMinimumSize(int, int) | Setter.
void QWidget::setMouseTracking(bool) | Reimplement QWidget::changeEvent() and handle QEvent::MouseTrackingChange.
void QWidget::setPalette(const QPalette &) | Reimplement QWidget::changeEvent() and handle QEvent::PaletteChange and/or QEvent::ApplicationPaletteChange.
void QWidget::setPaletteBackgroundColor(const QColor &) | Setter.
void QWidget::setPaletteBackgroundPixmap(const QPixmap &) | Setter.
void QWidget::setSizeIncrement(int, int) | Setter.
void QWidget::setSizePolicy(QSizePolicy) | Setter.
void QWidget::setUpdatesEnabled(bool) | Setter.
void QWidget::setWFlags(WFlags) | Setter.
void QWidget::showMaximized() | Reimplement QWidget::changeEvent() and handle QEvent::WindowStateChange.
void QWidget::showMinimized() | Reimplement QWidget::changeEvent() and handle QEvent::WindowStateChange.
void QWidget::showNormal() | Reimplement QWidget::changeEvent() and handle QEvent::WindowStateChange.
void QWidget::styleChange(QStyle &) | Reimplement QWidget::changeEvent() and handle QEvent::StyleChange.
void QWidget::unsetCursor() | Setter.
void QWidget::windowActivationChange(bool) | Reimplement QWidget::changeEvent() and handle QEvent::ActivationChange.