Package org.gnome.gtk

Interface Gesture.CancelCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

Gesture

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 Gesture.CancelCallback
extends FunctionPointer

Functional interface declaration of the CancelCallback callback.

See Also:

• run(org.gnome.gdk.EventSequence)

Method Summary

Modifier and Type	Method	Description
void	run(@Nullable EventSequence sequence)	Emitted whenever a sequence is cancelled.
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 sourceGesture, MemorySegment sequence)	The upcall method is called from native code.

Method Details

run

void run(@Nullable
 @Nullable EventSequence sequence)

Emitted whenever a sequence is cancelled.

This usually happens on active touches when EventController.reset() is called on gesture (manually, due to grabs...), or the individual sequence was claimed by parent widgets' controllers (see Gesture.setSequenceState(org.gnome.gdk.EventSequence, org.gnome.gtk.EventSequenceState)).

gesture must forget everything about sequence as in response to this signal.

upcall

default void upcall(MemorySegment sourceGesture,
 MemorySegment sequence)

The upcall method is called from native code. The parameters are marshaled and run(org.gnome.gdk.EventSequence) 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