Package org.gnome.gdk

Interface Surface.RenderCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

Surface

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 Surface.RenderCallback
extends FunctionPointer

Functional interface declaration of the RenderCallback callback.

See Also:

• run(org.freedesktop.cairo.Region)

Method Summary

Modifier and Type	Method	Description
boolean	run(@Nullable org.freedesktop.cairo.Region region)	Emitted when part of the surface needs to be redrawn.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.
default int	upcall(MemorySegment sourceSurface, MemorySegment region)	The upcall method is called from native code.

Method Details

run

boolean run(@Nullable org.freedesktop.cairo.Region region)

Emitted when part of the surface needs to be redrawn.

upcall

default int upcall(MemorySegment sourceSurface,
 MemorySegment region)

The upcall method is called from native code. The parameters are marshaled and run(org.freedesktop.cairo.Region) 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 arena in which the function pointer is allocated

Returns:

the native function pointer