Package org.gnome.gtk

Interface Switch.StateSetCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

Switch

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface Switch.StateSetCallback
extends FunctionPointer

Functional interface declaration of the StateSetCallback callback.

See Also:

• run(boolean)

Method Summary

Modifier and Type	Method	Description
boolean	run(boolean state)	Emitted to change the underlying state.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, int) method.
default int	upcall(MemorySegment sourceSwitch, int state)	The upcall method is called from native code.

Method Details

run

boolean run(boolean state)

Emitted to change the underlying state.

The ::state-set signal is emitted when the user changes the switch position. The default handler calls Switch.setState(boolean) with the value of state.

To implement delayed state change, applications can connect to this signal, initiate the change of the underlying state, and call Switch.setState(boolean) when the underlying state change is complete. The signal handler should return true to prevent the default handler from running.

upcall

default int upcall(MemorySegment sourceSwitch,
 int state)

The upcall method is called from native code. The parameters are marshaled and run(boolean) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, int) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer