10.5.3 Abstract Gadget Classes

10.5.3.3 The Menu-Button Gadget

The menu-button gadget provides similar behavior to the toggle-button gadget, except that it is intended for items in menus. The returned value is generally the item chosen from the menu.

arm-callback will be invoked when the menu button becomes armed (such as when the pointer moves into it, or a pointer button is pressed over it). When the menu button is actually activated (by releasing the pointer button over it), value-changed-callback will be invoked. Finally, disarm-callback will be invoked after value-changed-callback, or when the pointer is moved outside of the menu button.

menu-button [Class]

Summary:

The class that implements an abstract menu button. It is a subclass of value-
gadget and labelled-gadget-mixin.

Summary:

The class that implements a portable menu button; a subclass of menu-button.

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