Application Header file <Xaw/Toggle.h> Class Header file <Xaw/ToggleP.h> Class toggleWidgetClass Class Name Toggle Superclass Command The Toggle 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. This widget maintains a Boolean state (e.g. True/False or On/Off) and changes state whenever it is selected. When the pointer is on the Toggle widget, the Toggle widget may become highlighted by drawing a rectangle around its perimeter. This highlighting indicates that the Toggle widget is ready for selection. When pointer button 1 is pressed and released, the Toggle widget indicates that it has changed state by reversing its foreground and background colors, and its notify action is invoked, calling all functions on its callback list. If the pointer is moved off of the widget before the pointer button is released, the Toggle widget reverts to its previous foreground and background colors, and releasing the pointer button has no effect. This behavior allows the user to cancel the operation. Toggle widgets may also be part of a ``radio group.'' A radio group is a list of at least two Toggle widgets in which no more than one Toggle may be set at any time. A radio group is identified by the widget ID of any one of its members. The convenience routine XawToggleGetCurrent will return information about the Toggle widget in the radio group. Toggle widget state is preserved across changes in sensitivity. When creating a Toggle 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 NULL 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 pointerColor Foreground Pixel XtDefaultForeground pointerColorBackground Background Pixel XtDefaultBackground radioData RadioData Pointer Name of widget radioGroup Widget Widget No radio group resize Resize Boolean True screen Screen Screen R Parent's Screen sensitive Sensitive Boolean True shapeStype ShapeStyle ShapeStyle Rectangle state State Boolean Off translations Translations TranslationTable See below width Width Dimension A graphic width + 2 * internalWidth x Position Position 0 y Position Position 0 radioData Specifies the data that will be returned by XawToggleGetCurrent when this is the currently set widget in the radio group. This value is also used to identify the Toggle that will be set by a call to XawToggleSetCurrent. The value NULL will be returned by XawToggleGetCurrent if no widget in a radio group is currently set. Programmers must not specify NULL (or Zero) as radioData. radioGroup Specifies another Toggle widget that is in the radio group to which this Toggle widget should be added. A radio group is a group of at least two Toggle widgets, only one of which may be set at a time. If this value is NULL (the default) then the Toggle will not be part of any radio group and can change state without affecting any other Toggle widgets. If the widget specified in this resource is not already in a radio group then a new radio group will be created containing these two Toggle widgets. No Toggle widget can be in multiple radio groups. The behavior of a radio group of one toggle is undefined. A converter is registered which will convert widget names to widgets without caching. state Specifies whether the Toggle widget is set (True) or unset (False). The Toggle widget supports the following actions: Switching the Toggle widget between the foreground and background colors with set and unset and toggle Processing application callbacks with notify Switching the internal border between highlighted and unhighlighted states with highlight and unhighlight The following are the default translation bindings used by the Toggle widget: <EnterWindow>: highlight(Always) <LeaveWindow>: unhighlight() <Btn1Down>,<Btn1Up>: toggle() notify() The full list of actions supported by Toggle is: highlight(condition) Displays the internal highlight border in the color (foreground or background ) that contrasts with the interior color of the Toggle widget. The conditions WhenUnset and Always are understood by this action procedure. If no argument is passed then WhenUnset is assumed. unhighlight() Displays the internal highlight border in the color (foreground or background ) that matches the interior color of the Toggle widget. set() Enters the set state, in which notify is possible. This action causes the Toggle widget 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 Toggle widget in the background color. The label or bitmap is displayed in the foreground color. toggle() Changes the current state of the Toggle widget, causing to be set if it was previously unset, and unset if it was previously set. If the widget is to be set, and is in a radio group then this procedure may unset another Toggle widget causing all routines on its callback list to be invoked. The callback routines for the Toggle that is to be unset will be called before the one that is to be set. reset() Cancels any set or highlight and displays the interior of the Toggle widget in the background color, with the label displayed in the foreground color. notify() When the Toggle widget 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. When a bitmap of depth greater that one (1) is specified the set(), unset(), and reset() actions have no effect, since there are no foreground and background colors used in a multi-plane pixmap. There are typically two types of radio groups desired by applications. The default translations for the Toggle widget implement a "zero or one of many" radio group. This means that there may be no more than one Toggle widget active, but there need not be any Toggle widgets active. The other type of radio group is "one of many" and has the more strict policy that there will always be exactly one radio button active. Toggle widgets can be used to provide this interface with a slight modification to the translation table of each Toggle in the group. <EnterWindow>: highlight(Always) <LeaveWindow>: unhighlight() <Btn1Down>,<Btn1Up>: set() notify() This translation table will not allow any Toggle to be unset except as a result of another Toggle becoming set. It is the application programmer's responsibility to choose an initial state for the radio group by setting the state resource of one of its member widgets to True. The following functions allow easy access to the Toggle widget's radio group functionality. To enable an application to change the Toggle's radio group, add the Toggle to a radio group, or remove the Toggle from a radio group, use XawToggleChangeRadioGroup. void XawToggleChangeRadioGroup Widgetw, radio_group w Specifies the Toggle widget. radio_group Specifies any Toggle in the new radio group. If NULL then the Toggle will be removed from any radio group of which it is a member. If a Toggle is already set in the new radio group, and the Toggle to be added is also set then the previously set Toggle in the radio group is unset and its callback procedures are invoked. Finding the Currently selected Toggle in a radio group of Toggles To find the currently selected Toggle in a radio group of Toggle widgets use XawToggleGetCurrent. XtPointer XawToggleGetCurrent XtPointer XawToggleGetCurrent(radio_group) Widget radio_group radio_group Specifies any Toggle widget in the radio group. The value returned by this function is the radioData of the Toggle in this radio group that is currently set. The default value for radioData is the name of that Toggle widget. If no Toggle is set in the radio group specified then NULL is returned. Changing the Toggle that is set in a radio group. To change the Toggle that is currently set in a radio group use XawToggleSetCurrent. void XawToggleSetCurrent voidXawToggleSetCurrent(radio_group, radio_data) Widget radio_group XtPointer radio_data radio_group Specifies any Toggle widget in the radio group. radio_data Specifies the radioData identifying the Toggle that should be set in the radio group specified by the radio_group argument. XawToggleSetCurrent locates the Toggle widget to be set by matching radio_data against the radioData for each Toggle in the radio group. If none match, XawToggleSetCurrent returns without making any changes. If more than one Toggle matches, XawToggleSetCurrent will choose a Toggle to set arbitrarily. If this causes any Toggle widgets to change state, all routines in their callback lists will be invoked. The callback routines for a Toggle that is to be unset will be called before the one that is to be set. Unsetting all Toggles in a radio group. To unset all Toggle widgets in a radio group use XawToggleUnsetCurrent. void XawToggleUnsetCurrent void XawToggleUnsetCurrent(radio_group) Widget radio_group radio_group Specifies any Toggle widget in the radio group. If this causes a Toggle widget to change state, all routines on its callback list will be invoked.