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Plasma

toolbutton.cpp

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00001 /*
00002  *   Copyright 2008 Marco Martin <notmart@gmail.com>
00003  *   Copyright 2008 Aaron Seigo <aseigo@kde.org>
00004  *
00005  *   This program is free software; you can redistribute it and/or modify
00006  *   it under the terms of the GNU Library General Public License as
00007  *   published by the Free Software Foundation; either version 2, or
00008  *   (at your option) any later version.
00009  *
00010  *   This program is distributed in the hope that it will be useful,
00011  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *   GNU General Public License for more details
00014  *
00015  *   You should have received a copy of the GNU Library General Public
00016  *   License along with this program; if not, write to the
00017  *   Free Software Foundation, Inc.,
00018  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00019  */
00020 
00021 #include "toolbutton.h"
00022 
00023 //Qt
00024 #include <QAction>
00025 #include <QPainter>
00026 #include <QPaintEvent>
00027 #include <QStyle>
00028 #include <QStyleOptionToolButton>
00029 #include <QGraphicsSceneHoverEvent>
00030 
00031 //KDE
00032 #include <KColorUtils>
00033 
00034 //Plasma
00035 #include <Plasma/PaintUtils>
00036 #include <Plasma/Theme>
00037 #include <Plasma/FrameSvg>
00038 #include <Plasma/Animator>
00039 
00040 ToolButton::ToolButton(QWidget *parent)
00041     : QToolButton(parent),
00042       m_action(0),
00043       m_animationId(0),
00044       m_alpha(0),
00045       m_fadeIn(true)
00046 {
00047     m_background = new Plasma::FrameSvg(this);
00048     m_background->setImagePath("widgets/button");
00049     m_background->setCacheAllRenderedFrames(true);
00050     m_background->setElementPrefix("plain");
00051 }
00052 
00053 void ToolButton::setAction(QAction *action)
00054 {
00055     if (!action) {
00056         return;
00057     }
00058 
00059     if (m_action) {
00060         disconnect(m_action, SIGNAL(changed()), this, SLOT(syncToAction()));
00061         disconnect(this, SIGNAL(clicked()), m_action, SLOT(trigger()));
00062     }
00063 
00064     m_action = action;
00065     connect(m_action, SIGNAL(changed()), this, SLOT(syncToAction()));
00066     connect(this, SIGNAL(clicked()), m_action, SLOT(trigger()));
00067     connect(m_action, SIGNAL(destroyed(QObject*)), this, SLOT(actionDestroyed(QObject*)));
00068     syncToAction();
00069 }
00070 
00071 void ToolButton::syncToAction()
00072 {
00073     if (!m_action) {
00074         return;
00075     }
00076 
00077     setIcon(m_action->icon());
00078     setText(m_action->text());
00079 
00080     if (toolButtonStyle() == Qt::ToolButtonIconOnly) {
00081         setToolTip(m_action->text());
00082     }
00083 
00084     setCheckable(m_action->isCheckable());
00085     if (m_action->actionGroup()) {
00086         setAutoExclusive(m_action->actionGroup()->isExclusive());
00087     }
00088 
00089     setEnabled(m_action->isEnabled());
00090 }
00091 
00092 void ToolButton::actionDestroyed(QObject *)
00093 {
00094     m_action = 0;
00095 }
00096 
00097 void ToolButton::paintEvent(QPaintEvent *event)
00098 {
00099     Q_UNUSED(event)
00100 
00101     QPainter painter(this);
00102 
00103     QStyleOptionToolButton buttonOpt;
00104     initStyleOption(&buttonOpt);
00105 
00106     if (m_animationId || (buttonOpt.state & QStyle::State_MouseOver) || (buttonOpt.state & QStyle::State_On)) {
00107         if (buttonOpt.state & QStyle::State_Sunken || (buttonOpt.state & QStyle::State_On)) {
00108             m_background->setElementPrefix("pressed");
00109         } else {
00110             m_background->setElementPrefix("normal");
00111         }
00112         m_background->resizeFrame(size());
00113 
00114         if (m_animationId) {
00115             QPixmap buffer = m_background->framePixmap();
00116 
00117             QPainter bufferPainter(&buffer);
00118             bufferPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
00119             QColor alphaColor(Qt::black);
00120             alphaColor.setAlphaF(qMin(qreal(0.95), m_alpha));
00121             bufferPainter.fillRect(buffer.rect(), alphaColor);
00122             bufferPainter.end();
00123 
00124             painter.drawPixmap(QPoint(0,0), buffer);
00125 
00126             buttonOpt.palette.setColor(QPalette::ButtonText, KColorUtils::mix(Plasma::Theme::defaultTheme()->color(Plasma::Theme::ButtonTextColor), Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor), 1-m_alpha));
00127         } else {
00128             m_background->paintFrame(&painter);
00129             buttonOpt.palette.setColor(QPalette::ButtonText, Plasma::Theme::defaultTheme()->color(Plasma::Theme::ButtonTextColor));
00130         }
00131 
00132     } else {
00133         buttonOpt.palette.setColor(QPalette::ButtonText, Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor));
00134     }
00135 
00136     style()->drawControl(QStyle::CE_ToolButtonLabel, &buttonOpt, &painter, this);
00137 }
00138 
00139 void ToolButton::enterEvent(QEvent *event)
00140 {
00141     if (isChecked()) {
00142         return;
00143     }
00144 
00145     const int FadeInDuration = 75;
00146 
00147     if (m_animationId) {
00148         Plasma::Animator::self()->stopElementAnimation(m_animationId);
00149     }
00150 
00151     m_fadeIn = true;
00152     m_animationId = Plasma::Animator::self()->customAnimation(
00153         40 / (1000 / FadeInDuration), FadeInDuration,
00154         Plasma::Animator::LinearCurve, this, "animationUpdate");
00155 }
00156 
00157 void ToolButton::leaveEvent(QEvent *event)
00158 {
00159     if (isChecked()) {
00160         return;
00161     }
00162 
00163     const int FadeOutDuration = 150;
00164 
00165     if (m_animationId) {
00166         Plasma::Animator::self()->stopElementAnimation(m_animationId);
00167     }
00168 
00169     m_fadeIn = false;
00170     m_animationId = Plasma::Animator::self()->customAnimation(
00171         40 / (1000 / FadeOutDuration), FadeOutDuration,
00172         Plasma::Animator::LinearCurve, this, "animationUpdate");
00173 }
00174 
00175 
00176 void ToolButton::animationUpdate(qreal progress)
00177 {
00178     if (qFuzzyCompare(progress, 1)) {
00179         m_animationId = 0;
00180         m_fadeIn = true;
00181     }
00182 
00183     m_alpha = m_fadeIn ? progress : 1 - progress;
00184 
00185     // explicit update
00186     update();
00187 }
00188 
00189 #include "toolbutton.moc"
00190 

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