Package org.gnome.gio

Interface SimpleAction.ActivateCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

SimpleAction

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 SimpleAction.ActivateCallback
extends FunctionPointer

Functional interface declaration of the ActivateCallback callback.

See Also:

• run(org.gnome.glib.Variant)

Method Summary

Modifier and Type	Method	Description
void	run(@Nullable Variant parameter)	Indicates that the action was just activated.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.
default void	upcall(MemorySegment sourceSimpleAction, MemorySegment parameter)	The upcall method is called from native code.

Method Details

run

void run(@Nullable
 @Nullable Variant parameter)

Indicates that the action was just activated.

parameter will always be of the expected type, i.e. the parameter type specified when the action was created. If an incorrect type is given when activating the action, this signal is not emitted.

Since GLib 2.40, if no handler is connected to this signal then the default behaviour for boolean-stated actions with a null parameter type is to toggle them via the GSimpleAction::change-state signal. For stateful actions where the state type is equal to the parameter type, the default is to forward them directly to GSimpleAction::change-state. This should allow almost all users of GSimpleAction to connect only one handler or the other.

upcall

default void upcall(MemorySegment sourceSimpleAction,
 MemorySegment parameter)

The upcall method is called from native code. The parameters are marshaled and run(org.gnome.glib.Variant) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

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

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer