Volume 6A: Motif Programming Manual

User interface of dialog.uil

27.5 Prototyping an Interface With UIL

The showuid program in Chapter 24, Creating a User Interface With UIL, provides a useful foundation for

prototyping a user interface. The program contains two simple callbacks: one for printing a message and one for

exiting the program. By adding a few more callbacks, we can make the program even more useful as a building block

for developing interfaces.

27.5.1 Managing Widgets

Most user interfaces consist of a main application window and several support windows or dialogs. Since dialogs are

frequently posted and unposted, we can make prototyping easier by writing callbacks that manage and unmanage

widgets. the source code shows these routines.

void

manage (w, client_data,call_data)

Widget w;

XtPointer client_data;

XtPointer call_data;

{

Widget target = (Widget) client_data;

XtManageChild (target);

}

void

unmanage (w, client_data, call_data)

Widget w;

XtPointer client_data;

XtPointer call_data;

{

Widget target = (Widget) client_data;

XtUnmanageChild (target);

}

When adding new callbacks, we also need to update the list of callbacks that the showuid application registers with

MrmRegisterNames(). With the addition of these two functions, the list is declared as follows:

static MrmRegisterArg callback_list[] = {

{ "quit", (XtPointer) quit },

27 Advanced UIL Programming27.5 Prototyping an Interface With UIL

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{ "print", (XtPointer) ...