Package org.gnome.gtk

Interface GestureStylus.DownCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

GestureStylus

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 GestureStylus.DownCallback
extends FunctionPointer

Functional interface declaration of the DownCallback callback.

See Also:

• run(double, double)

Method Summary

Modifier and Type	Method	Description
void	run(double x, double y)	Emitted when the stylus touches the device.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, double, double) method.
default void	upcall(MemorySegment sourceGestureStylus, double x, double y)	The upcall method is called from native code.

Method Details

run

void run(double x,
 double y)

Emitted when the stylus touches the device.

upcall

default void upcall(MemorySegment sourceGestureStylus,
 double x,
 double y)

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

toCallback

default MemorySegment toCallback(Arena arena)

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

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer