XtCallbackE(3x) — HP-UX 9.05

NAME

XtCallbackExclusive − callback function to pop up a widget.

Synopsis

void XtCallbackExclusive(w, client_data, call_data)

    Widget w;
    XtPointer client_data;
    XtPointer call_data;

Inputs

wSpecifies the widget.

client_data
Specifies the popup shell.

call_dataSpecifies the callback data, which is not used by this procedure.

Description

XtCallbackExclusive() calls XtPopup() on the widget passed in the client_data argument with grab_mode set to XtGrabExclusive. Then it calls XtSetSensitive() on w to make that widget insensitive. XtCallbackExclusive() is a convenience procedure designed to be registered on a widget’s callback list (which is why it has a third, unused argument). The widget to be popped up should be registered as client_data for the callback. The reason that this callback makes its invoking widget insensitive is so that the use cannot request to popup the shell again while it is already up.

Usage

To popup a shell with a non-exclusive grab or with no grab at all, you can use XtCallbackNonexclusive() or XtCallbackNone(). To popdown a shell from a callback, use XtCallbackPopdown(). Note that this function does not attempt to place the popup shell at any particular location, and for that reason may not be appropriate in many circumstances. It is also possible to pop up a shell with the XtMenuPopup action.

Example

To arrange for the shell pshell to be popped up when the use clicks on the button widget button, you would use code like the following:

XtAddCallback(button,XtNcallback,XtCallbackExclusive,pshell);

A companion example is presented on the XtCallbackPopdown() reference page.

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