4.1 Choice classes

4.1.1 Push button panels

The arrangement of a number of push buttons into one group can be done with a push-button-panel. Since this provides a panel of buttons which do not maintain a selection when you click on them,push-button-panel is achoice that does not allow a selection. When a button is activated it causes a:selection-callback, but the button does not maintain the selected state.

Here is an example of a push button panel:

(make-instance 'push-button-panel
               :items '(one two three four five)
               :selection-callback 'test-callback
               :print-function 'string-capitalize)

(contain *)

Figure 4.1 A group of push-buttons

The layout of a button panel (for instance, whether items are listed vertically or horizontally) can be specified using the:layout-class keyword. This can take two values:'column-layout if you wish buttons to be listed vertically, and'row-layout if you wish them to be listed horizontally. The default value is'row-layout. If you define your own layout classes, you can also use these as values to:layout-class. Layouts, which apply to many other CAPI objects, are discussed in detail in Chapter 5, "Laying Out CAPI Panes".

CAPI User Guide, Liquid Common Lisp Version 5.0 - 2 OCT 1997

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