Skip to Main Content
Volume 6A: Motif Programming Manual
book

Volume 6A: Motif Programming Manual

by David Brennan, Dan Heller, Paula Ferguson
September 1993
Intermediate to advanced content levelIntermediate to advanced
1014 pages
28h 26m
English
O'Reilly Media, Inc.
Content preview from Volume 6A: Motif Programming Manual
/* edit_cb() −− the callback routine for the items in the edit menu */
void
edit_cb(widget, client_data, call_data)
Widget widget;
XtPointer client_data;
XtPointer call_data;
{
Boolean result = True;
int reason = (int) client_data;
XEvent *event = ((XmPushButtonCallbackStruct *) call_data)−>event;
Time when;
XmTextSetString (text_output, NULL); /* clear message area */
if (event != NULL &&
reason == EDIT_CUT || reason == EDIT_COPY || reason == EDIT_CLEAR) {
switch (event−>type) {
case ButtonRelease :
when = event−>xbutton.time;
break;
case KeyRelease :
when = event−>xkey.time;
break;
default:
when = CurrentTime;
break;
}
}
switch (reason) {
case EDIT_CUT :
result = XmTextCut (text_edit, when);
break;
case EDIT_COPY :
result = XmTextCopy (text_edit, when);
break;
case EDIT_PASTE :
result = XmTextPaste (text_edit);
case EDIT_CLEAR :
XmTextClearSelection (text_edit, when);
break;
}
if (result == False)
XmTextSetString (text_output, "There is no selection.");
}
15.5 Text Callbacks
The Text and TextField widgets use callback routines in the same way as other Motif widgets. The widgets provide
callbacks for a number of different purposes, such as text modification, activation, and selection ownership. Some of
the routines, such as those that monitor keyboard input, may be invoked rather frequently. In the next few sections, we
introduce several of the callback routines for the widgets.
15.5.1 The Activation Callback
We begin by exploring the callback routine that is most commonly used for ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Volume 7A: XView Programming Manual

Volume 7A: XView Programming Manual

Dan Heller

Publisher Resources

ISBN: 9780596000431