Volume 6A: Motif Programming Manual

keysym. This function allows an application that overrides the default XtKeyProc to handle Motif's virtual key

bindings. See Section #seventspec in Chapter 2, The Motif Programming Model, for more information on virtual

bindings. The new XmChangeColor() routine changes the foreground color, shadow colors, and select color for a

widget based on a background color. The XmNdarkThreshold, XmN-foregroundThreshold, and

XmNlightThreshold resources of the Screen object allow the application or the user to set values that affect the

default color calculation algorithm. The values for these resources indicate the levels of perceived brightness (between

0 and 100) that distinguish between a light color and a dark color. The XmNforegroundThreshold value is used

in calculating the default foreground and highlight colors, while the other two resources are used in calculating the

default shadow and select colors. See Section #scolor for a discussion of color resources in Motif. An application can

use the new XmWidgetGetBaselines() routine to get the position of the text baseline in a widget, while

XmWidgetGetDisplayRect() can be used to get the size and position of the bounding box for the widget. These

routines provide information that is useful in laying out and aligning components in an interface.

4.5.2 Specific Widget Changes

Motif 1.2 also introduces a number of new features, including resources and callback routines, for individual widget

classes. In Motif 1.2, the Frame widget can have two children: ...