Volume 6A: Motif Programming Manual

This program defines widget creation functions for the Tree and Panner widgets and registers the routines with Mrm.

The program also defines the pan() callback routine for the Panner widget. This routine is specified for the

XtNreportCallback, as we'll show you shortly.

27.1.2 Widget Include Files

It usually makes sense to place the declarations for a user−defined widget in an include file so that they can be used in

more than one module. The include file for the Tree widget is shown in the source code

/* UIL declarations for the Xaw Tree widget. */

! Declare the creation procedure

procedure

XawCreateTreeWidget();

! Declare resources

value

XtNautoReconfigure : argument ('autoReconfigure', boolean);

XtNhSpace : argument ('hSpace', integer);

XtNlineWidth : argument ('lineWidth', integer);

XtNvSpace : argument ('vSpace', integer);

XtNgravity : argument ('gravity', integer);

NorthGravity : 2;

WestGravity : 4;

EastGravity : 6;

SouthGravity : 8;

! Constraint resources

XtNtreeGC : argument ('treeGC', any);

XtNtreeParent : argument ('treeParent', widget);

The Tree creation procedure is declared in a procedure section, even though the application registers a widget

creation procedure differently from a callback procedure. Creation procedures should be declared as taking no

arguments.

The resources for the Tree widget are defined using the UIL argument type. The syntax is the same as for any other

value, although argument values cannot be imported or exported. The argument literal specifies the ...