EZ_AddWidgetCallBack(3) EZWGL Functions EZ_AddWidgetCallBack(3)NAME
EZ_AddWidgetCallBack, EZ_RemoveWidgetCallBack, EZ_RemoveAllWidgetCall‐
Backs - register/remove callbacks associated to a widget
SYNOPSIS
#include <EZ.h>
void EZ_AddWidgetCallBack( EZ_Widget *widget,
int which, EZ_CallBack callback, void *clientdata, int location)
void EZ_AddWidgetCallBack00( EZ_Widget *widget,
int which, EZ_CallBack callback, void *clientdata, int location)
void EZ_RemoveWidgetCallBack( EZ_Widget *widget,
int which, EZ_CallBack callback, void *clientdata)
void EZ_RemoveWidgetCallBack00( EZ_Widget *widget,
int which, EZ_CallBack callback, void *clientdata)
void EZ_RemoveAllWidgetCallBacks( EZ_Widget *widget, int which)
void EZ_RemoveAllWidgetCallBacks00( EZ_Widget *widget, int which)
ARGUMENTS
widget Specifies an EZ widget.
callback Specifies a callback.
clientdata Specifies an clientdata to be passed to the callback.
which Specifies a callback list.
location Specifies when the callback is to be called relative to other
previousely registered callbacks.
DESCRIPTION
An callback is a procedure of the following prototype:
void (* callback)(void *object, void *data)
EZ_AddWidgetCallBack registers a callback to a widget. There are three
callback lists associated to a widget: an EZ_CALLBACK list, an
EZ_MOTION_CALLBACK list and an EZ_DESTROY_CALLBACK list. Motion call‐
backs are invoked whenever the the selection item changes. Normal call‐
backs are called when a Button1 press occurs on the widget window or a
selection is made. Destroy callbacks are invoked at the time a widget
is destroyed. If location is 0, the callback will be put in front of
all previously registered callbacks. If location is 1, the callback
will be inserted at the end of all previousely registered callbacks.
For composite widget, EZ_AddWidgetCallBack registers the callback to
the most appropriate inter widget. To register a callback to a compos‐
ite widget itself, use EZ_AddWidgetCallBack00.
EZ_RemoveWidgetCallBack deletes a callback from the specified callback
list. The specified callback will be deleted only if both the procedure
and the client data match.
For composite widget, EZ_RemoveWidgetCallBack removes the callback from
the most appropriate inter widget. To remove a callback from a compos‐
ite widget's callback list, use EZ_RemoveWidgetCallBack00.
EZ_RemoveAllCallBacks deletes all callbacks from the specified callback
list.
SEE ALSOEZ_AddEventHandler(3)EZWGLEZ_AddWidgetCallBack(3)
