MenuButton Widget Application Header file <X11/Xaw/MenuButton.h> Class Header file <X11/Xaw/MenuButtonP.h> Class menuButtonWidgetClass Class Name MenuButton Superclass Command The MenuButton widget is an area, often rectangular, that displays a graphic. The graphic may be a text string containing multiple lines of characters in an 8 bit or 16 bit character set (to be displayed with a font), or in a multi-byte encoding (for use with a fontset). The graphic may also be a bitmap or pixmap. When the pointer cursor is on a MenuButton widget, the MenuButton becomes highlighted by drawing a rectangle around its perimeter. This highlighting indicates that the MenuButton is ready for selection. When a pointer button is pressed, the MenuButton widget will pop up the menu named in the menuName resource. Resources When creating a MenuButton widget instance, the following resources are retrieved from the argument list or from the resource database: Name Class Type Notes Default Value accelerators Accelerators AcceleratorTable NULL ancestorSensitive AncestorSensitive Boolean D True background Background Pixel XtDefaultBackground backgroundPixmap Pixmap Pixmap XtUnspecifiedPixmap bitmap Bitmap Pixmap None borderColor BorderColor Pixel XtDefaultForeground borderPixmap Pixmap Pixmap XtUnspecifiedPixmap borderWidth BorderWidth Dimension 1 callback Callback XtCallbackList NULL colormap Colormap Colormap Parent's Colormap cornerRoundPercent CornerRoundPercent Dimension 25 cursor Cursor Cursor None cursorName Cursor String None depth Depth int C Parent's Depth destroyCallback Callback XtCallbackList NULL encoding Encoding UnsignedChar XawTextEncoding8bit font Font XFontStruct XtDefaultFont fontSet FontSet XFontSet XtDefaultFontSet foreground Foreground Pixel XtDefaultForeground height Height Dimension A graphic height + 2 * internalHeight highlightThickness Thickness Dimension A 2 (0 if Shaped) insensitiveBorder Insensitive Pixmap GreyPixmap internalHeight Height Dimension 2 internalWidth Width Dimension 4 international International Boolean C False justify Justify Justify XtJustifyCenter (center) label Label String name of widget leftBitmap LeftBitmap Bitmap None mappedWhenManaged MappedWhenManaged Boolean True menuName MenuName String "menu" pointerColor Foreground Pixel XtDefaultForeground pointerColorBackground Background Pixel XtDefaultBackground resize Resize Boolean True screen Screen Screen R Parent's Screen sensitive Sensitive Boolean True shapeStype ShapeStyle ShapeStyle Rectangle translations Translations TranslationTable See below width Width Dimension A graphic width + 2 * internalWidth x Position Position 0 y Position Position 0 _ menuName The name of a popup shell to popup as a menu. The MenuButton will search for this name using XtNameToWidget starting with itself as the reference widget. If the search is unsuccessful the widget will continue up the widget tree using each of its ancestors as the reference widget passed to XtNameToWidget. If no widget of called menuName is found by this algorithm, the widget will print a warning message and give up. When the menu is found it will be popped up exclusive and spring_loaded. The MenuButton widget does not copy the value of this resource into newly allocated memory. The application programmer must pass the resource value in nonvolatile memory. MenuButton Actions The MenuButton widget supports the following actions: Switching the button between the foreground and background colors with set and unset Processing application callbacks with notify Switching the internal border between highlighted and unhighlighted states with highlight and unhighlight Popping up a menu with PopupMenu The following are the default translation bindings used by the MenuButton widget: <EnterWindow>: highlight(\|) <LeaveWindow>: reset(\|) <BtnDown>: reset(\|) PopupMenu(\) MenuButton Actions The full list of actions supported by MenuButton is: highlight(condition) Displays the internal highlight border in the color (foreground or background ) that contrasts with the interior color of the Command widget. The conditions WhenUnset and Always are understood by this action procedure. If no argument is passed, WhenUnset is assumed. unhighlight(\|) Displays the internal highlight border in the color (XtNforeground or background ) that matches the interior color of the MenuButton widget. set(\|) Enters the set state, in which notify is possible. This action causes the button to display its interior in the foreground color. The label or bitmap is displayed in the background color. unset(\|) Cancels the set state and displays the interior of the button in the background color. The label or bitmap is displayed in the foreground color. reset(\|) Cancels any set or highlight and displays the interior of the button in the background color, with the label displayed in the foreground color. notify(\|) When the button is in the set state this action calls all functions in the callback list named by the callback resource. The value of the call_data argument in these callback functions is undefined. PopupMenu(\|) Pops up the menu specified by the menuName resource. The MenuButton widget does not place a server grab on itself. Instead, PopupMenu is registered as a grab action. As a result, clients which popup menus without using XtMenuPopup or MenuPopup or PopupMenu in translations will fail to have a grab active. They should make a call to XtRegisterGrabAction on the appropriate action in the application initialization routine, or use a different translation.