Page 323	Table of Contents	Index	Page 325
	Chapters
	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 A, B, C, D, E

CHAPTER 30. GADGETS

=> gadget-client gadget [Generic Function]
=> (setf gadget-client) client gadget [Generic Function]
Returns the client of the gadget gadget. The client is usually an application frame, but it could
be another gadget (for example, in the case of a push button that is contained in a radio box).

=> gadget-armed-callback gadget [Generic Function]
=> gadget-disarmed-callback gadget [Generic Function]
Returns the functions that will be called when the armed or disarmed callback, respectively, are
invoked. These functions will be invoked with a single argument, the gadget.

When these functions return nil, that indicates that there is no armed (or disarmed) callback
for the gadget.

=> armed-callback gadget client gadget-id [Callback Generic Function]
=> disarmed-callback gadget client gadget-id [Callback Generic Function]
These callbacks are invoked when the gadget gadget is, respectively, armed or disarmed. The
exact definition of arming and disarming varies from gadget to gadget, but typically a gadget
becomes armed when the pointer is moved into its region, and disarmed when the pointer moves
out of its region.

The default methods (on standard-gadget) call the function stored in gadget-armed-callbackor gadget-disarmed-callback with one argument, the gadget.

=> activate-gadget gadget [Generic Function]
Causes the host gadget to become active, that is, available for input.

=> deactivate-gadget gadget [Generic Function]
Causes the host gadget to become inactive, that is, unavailable for input. In some environments
this may cause the gadget to become grayed over; in others, no visual effect may be detected.

=> note-gadget-activated client gadget [Generic Function]
This function is invoked after a gadget is made active.

=> note-gadget-deactivated client gadget [Generic Function]
This function is invoked after a gadget is made inactive.

=> value-gadget [Class]
The class used by gadgets that have a value; a subclass of standard-gadget.

=> :value [Init Arg]
=> :value-changed-callback [Init Arg]
All subclasses of value-gadget must handle these two initargs, which are used to specify, re-

Page 323	Table of Contents	Index	Page 325
	Chapters
	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 A, B, C, D, E