DwtPullEntryGadgetCreate(3Dwt)

Name

DwtPullEntryGadgetCreate − Creates a pull-down menu entry gadget.

Syntax

Widget DwtPullEntryGadgetCreate (parent_widget, name,
                                  override_arglist,
                                  override_argcount)
     Widget parent_widget;
     char *name;
     ArgList override_arglist;
     int override_argcount;

Arguments

parent_widget
Specifies the parent widget ID.

nameSpecifies the name of the created widget.

override_arglist
Specifies the application override argument list.

override_argcount
Specifies the number of attributes in the application override argument list (override_arglist).

Description

The DwtPullEntryGadgetCreate function creates an instance of the pull-down menu entry gadget and returns its associated gadget ID.

A pull-down menu entry gadget is similar in appearance and semantics to a pull-down menu entry widget. Like all gadgets, it does not have a window but uses the window of the closest antecedent widget. This gadget must be a child of a menu class widget.

Because a pull-down menu entry gadget is not a subclass of composite, children are not supported.

The sizing of the gadget is affected by the font and the label.

Inherited Attributes

Attribute Name	Data Type	Default
Rectangle Attributes
DwtNx	Position	Determined by the geometry manager
DwtNy	Position	Determined by the geometry manager
DwtNwidth	Dimension	The label width, plus the hotspot width, plus 2 times DwtNmarginWidth
DwtNheight	Dimension	The text label or pixmap label height plus 2 times DwtNmarginHeight
DwtNborderWidth	Dimension	Zero pixels
DwtNsensitive	Boolean	True
DwtNancestorSensitive	Boolean	The bitwise AND of the parent widget’s DwtNsensitive and DwtNancestorSensitive attributes
Label Gadget Attributes
DwtNlabel	DwtCompString	Widget name
DwtNalignment	unsigned char	DwtAlignmentCenter
DwtNdirectionRToL	Boolean	False
DwtNhelpCallback	DwtCallbackPtr	NULL

Widget-Specific Attributes

Attribute Name	Data Type	Default
DwtNsubMenuId	Widget	NULL
DwtNactivateCallback	DwtCallbackPtr	NULL
DwtNpullingCallback	DwtCallbackPtr	NULL

DwtNsubMenuIdSpecifies the widget ID of the submenu that will be displayed when the pull-down menu is activated.

DwtNactivateCallback
Specifies the callback that is executed when the user releases a button inside the pull-down menu widget. For this callback, the reason is DwtCRActivate.

DwtNpullingCallback
Specifies the callback function or functions called just prior to pulling down the submenu. This callback occurs just before the submenu’s map callback. You can use this callback to defer the creation of the submenu. For this callback, the reason is DwtCRActivate.

Return Values

This function returns the ID of the created widget.

Callback Information

The following structure is returned to your callback:

typedef struct {
int reason;
XEvent *event;
} DwtAnyCallbackStruct;

The reason member is set to a constant that represents the reason why this callback was invoked. For this callback, the reason member can be set to:

DwtCRActivate	The user selected the pull-down menu entry.
DwtCRHelpRequested	The user selected Help.

The event member is a pointer to the Xlib structure XEvent, which describes the event that generated this callback. This structure is a union of the individual structures declared for each event type. For information on XEvent and event processing, see the Guide to the Xlib Library: C Language Binding.

Museum