Module org.freedesktop.cairo

Package org.freedesktop.cairo

Interface SurfaceObserverCallback

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 interface SurfaceObserverCallback

A generic callback function for surface operations.

Since:

1.12

Method Summary

Modifier and Type	Method	Description
void	run(Surface target)	A generic callback function for surface operations.
default MemorySegment	toCallback(Arena arena)	Generates an upcall stub, a C function pointer that will call upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment).
default void	upcall(MemorySegment observer, MemorySegment target, MemorySegment data)	The callback that is executed by native code.

Method Details

run

void run(Surface target)

A generic callback function for surface operations.

Parameters:

target - the observed surface

Since:

1.12

upcall

default void upcall(MemorySegment observer,
 MemorySegment target,
 MemorySegment data)

The callback that is executed by native code. This method marshals the parameters and calls run(org.freedesktop.cairo.Surface).

Parameters:

observer - the SurfaceObserver, ignored

target - the observed surface

data - ignored

Since:

1.12

toCallback

default MemorySegment toCallback(Arena arena)

Generates an upcall stub, a C function pointer that will call upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment).

Parameters:

arena - the arena in which the upcall stub will be allocated

Returns:

the function pointer of the upcall stub

Since:

1.12