XmDrawingArea(3X)XmDrawingArea(3X)NAMEXmDrawingArea — The DrawingArea widget class
SYNOPSIS
#include <Xm/DrawingA.h>
VERSION
This page documents version 1.2 of the Motif library.
DESCRIPTION
DrawingArea is an empty widget that is easily adaptable to a variety of
purposes. It does no drawing and defines no behavior except for invok‐
ing callbacks. Callbacks notify the application when graphics need to
be drawn (exposure events or widget resize) and when the widget
receives input from the keyboard or mouse.
Applications are responsible for defining appearance and behavior as
needed in response to DrawingArea callbacks.
DrawingArea is also a composite widget and subclass of XmManager that
supports minimal geometry management for multiple widget or gadget
children.
Classes
DrawingArea inherits behavior and resources from the Core, Composite,
Constraint, and XmManager classes.
The class pointer is xmDrawingAreaWidgetClass.
The class name is XmDrawingArea.
New Resources
The following table defines a set of widget resources used by the pro‐
grammer to specify data. The programmer can also set the resource val‐
ues for the inherited classes to set attributes for this widget. To
reference a resource by name or by class in a .Xdefaults file, remove
the XmN or XmC prefix and use the remaining letters. To specify one of
the defined values for a resource in a .Xdefaults file, remove the Xm
prefix and use the remaining letters (in either lowercase or uppercase,
but include any underscores between words). The codes in the access
column indicate if the given resource can be set at creation time (C),
set by using XtSetValues (S), retrieved by using XtGetValues (G), or is
not applicable (N/A).
XmDrawingArea Resource Set
Name Class Type Default Access
─────────────────────────────────────────────────────────────────────────────
XmNexposeCallback XmCCallback XtCallbackList NULL C
XmNinputCallback XmCCallback XtCallbackList NULL C
XmNmarginHeight XmCMarginHeight Dimension 10 CSG
XmNmarginWidth XmCMarginWidth Dimension 10 CSG
XmNresizeCallback XmCCallback XtCallbackList NULL C
XmNresizePolicy XmCResizePolicy unsigned char XmRESIZE_ANY CSG
Specifies the list of callbacks that is called when DrawingArea
receives an exposure event. The callback reason is XmCR_EXPOSE. The
callback structure also includes the exposure event.
The default bit gravity for Manager windows is NorthWestGravity. This
may cause the XmNexposeCallback procedures not to be invoked when the
DrawingArea window is made smaller. Specifies the list of callbacks
that is called when the DrawingArea receives a keyboard or mouse event
(key or button, up or down). The callback reason is XmCR_INPUT. The
callback structure also includes the input event. Specifies the mini‐
mum spacing in pixels between the top or bottom edge of DrawingArea and
any child widget. Specifies the minimum spacing in pixels between the
left or right edge of DrawingArea and any child widget. Specifies the
list of callbacks that is called when the DrawingArea is resized. The
callback reason is XmCR_RESIZE. Controls the policy for resizing
DrawingArea widgets. Possible values include XmRESIZE_NONE (fixed
size), XmRESIZE_ANY (shrink or grow as needed), and XmRESIZE_GROW (grow
only).
Inherited Resources
DrawingArea inherits behavior and resources from the following super‐
classes. For a complete description of each resource, refer to the man
page for that superclass.
XmManager Resource Set
Name Class Type Default Access
──────────────────────────────────────────────────────────────────────────────────────────────────
XmNbottomShadowColor XmCBottomShadowColor Pixel dynamic CSG
XmNbottomShadowPixmap XmCBottomShadowPixmap Pixmap XmUNSPECIFIED_PIXMAP CSG
XmNforeground XmCForeground Pixel dynamic CSG
XmNhelpCallback XmCCallback XtCallbackList NULL C
XmNhighlightColor XmCHighlightColor Pixel dynamic CSG
XmNhighlightPixmap XmCHighlightPixmap Pixmap dynamic CSG
XmNinitialFocus XmCInitialFocus Widget NULL CSG
XmNnavigationType XmCNavigationType XmNavigationType XmTAB_GROUP CSG
XmNshadowThickness XmCShadowThickness Dimension 0 CSG
XmNstringDirection XmCStringDirection XmStringDirection dynamic CG
XmNtopShadowColor XmCTopShadowColor Pixel dynamic CSG
XmNtopShadowPixmap XmCTopShadowPixmap Pixmap dynamic CSG
XmNtraversalOn XmCTraversalOn Boolean True CSG
XmNunitType XmCUnitType unsigned char dynamic CSG
XmNuserData XmCUserData XtPointer NULL CSG
Composite Resource Set
Name Class Type Default Access
───────────────────────────────────────────────────────────────────────
XmNchildren XmCReadOnly WidgetList NULL G
XmNinsertPosition XmCInsertPosition XtOrderProc NULL CSG
XmNnumChildren XmCReadOnly Cardinal 0 G
Core Resource Set
Name Class Type Default Access
───────────────────────────────────────────────────────────────────────────────────────────────────────────────
XmNaccelerators XmCAccelerators XtAccelerators dynamic CSG
XmNancestorSensitive XmCSensitive Boolean dynamic G
XmNbackground XmCBackground Pixel dynamic CSG
XmNbackgroundPixmap XmCPixmap Pixmap XmUNSPECIFIED_PIXMAP CSG
XmNborderColor XmCBorderColor Pixel XtDefaultForeground CSG
XmNborderPixmap XmCPixmap Pixmap XmUNSPECIFIED_PIXMAP CSG
XmNborderWidth XmCBorderWidth Dimension 0 CSG
XmNcolormap XmCColormap Colormap dynamic CG
XmNdepth XmCDepth int dynamic CG
XmNdestroyCallback XmCCallback XtCallbackList NULL C
XmNheight XmCHeight Dimension dynamic CSG
XmNinitialResourcesPersistent XmCInitialResourcesPersistent Boolean True C
XmNmappedWhenManaged XmCMappedWhenManaged Boolean True CSG
XmNscreen XmCScreen Screen * dynamic CG
XmNsensitive XmCSensitive Boolean True CSG
XmNtranslations XmCTranslations XtTranslations dynamic CSG
XmNwidth XmCWidth Dimension dynamic CSG
XmNx XmCPosition Position 0 CSG
XmNy XmCPosition Position 0 CSG
Callback Information
A pointer to the following structure is passed to each callback: type‐
def struct { int reason; XEvent * event; Window window;
} XmDrawingAreaCallbackStruct; Indicates why the callback was invoked
Points to the XEvent that triggered the callback. This is NULL for the
XmNresizeCallback. Is set to the widget window
Translations
XmDrawingArea inherits translations from XmManager. Before calling the
XmManager actions, all events in the inherited translations except
<BtnMotion>, <EnterWindow>, <LeaveWindow>, <FocusIn>, and <FocusOut>
also call the DrawingAreaInput() action.
XmDrawingArea has the additional translations listed below. These
translations may not directly correspond to a translation table. MAny
BAny Press:DrawingAreaInput() MAny BAny Release:DrawingAreaInput()
MAny KAny Press:DrawingAreaInput() ManagerGadgetKeyIn‐
put() MAny KAny Release:DrawingAreaInput()
Action Routines
The XmDrawingArea action routines are described below: Unless the event
takes place in a gadget, calls the callbacks for XmNinputCallback.
Causes the current gadget to process a keyboard event.
Additional Behavior
The XmDrawingArea widget has the additional behavior described below:
Calls the callbacks for XmNexposeCallback. Calls the callbacks for
XmNresizeCallback.
Virtual Bindings
The bindings for virtual keys are vendor specific. For information
about bindings for virtual buttons and keys, see VirtualBindings(3X).
RELATED INFORMATIONComposite(3X), Constraint(3X), Core(3X), XmCreateDrawingArea(3X), and
XmManager(3X).
XmDrawingArea(3X)
