Volume 6A: Motif Programming Manual

if (!XmStringGetLtoR (cbs−>value, XmFONTLIST_DEFAULT_TAG, &filename))

return; /* must have been an internal error */

if (!*filename) { /* nothing typed? */

puts ("No file selected.");

XtFree( filename); /* even "" is an allocated byte */

return;

}

printf ("Filename given:

XtFree (filename);

}

The program simply prints the selected file when the user activates the OK button. The user can change the file by

selecting an item from the files list or by typing directly in the selection text entry area. The user can also activate the

dialog by double−clicking on an item in the files list. The FileSelectionDialog itself is very simple to create; most of

the work in the program is done by the callback routine for the OK button.

7.5.2 Internal Widgets

A FileSelectionDialog is made up of a number of subwidgets, including Text, List, and PushButton widgets. You can

get the handles to these children using the routine XmFileSelectionBoxGetChild(), which takes the

following form:

Widget

XmFileSelectionBoxGetChild(widget, child)

XmFileSelectionBox widget;

unsigned char child;

The widget parameter is a handle to a dialog widget, not its DialogShell parent. The child parameter is an

enumerated value that specifies a particular subwidget in the dialog. The parameter can have any one of the following

values:

XmDIALOG_APPLY_BUTTON

XmDIALOG_CANCEL_BUTTON

XmDIALOG_DEFAULT_BUTTON

XmDIALOG_DIR_LIST

XmDIALOG_DIR_LIST_LABEL

XmDIALOG_FILTER_LABEL

XmDIALOG_FILTER_TEXT

XmDIALOG_HELP_BUTTON

XmDIALOG_LIST

XmDIALOG_LIST_LABEL ...