Package org.gnome.gdk

Interface Surface.LayoutCallback

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.LayoutCallback
extends FunctionPointer

Functional interface declaration of the LayoutCallback callback.

See Also:

• run(int, int)

Method Summary

Modifier and Type	Method	Description
void	run(int width, int height)	Emitted when the size of surface is changed, or when relayout should be performed.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, int, int) method.
default void	upcall(MemorySegment sourceSurface, int width, int height)	The upcall method is called from native code.

Method Details

run

void run(int width,
 int height)

Emitted when the size of surface is changed, or when relayout should be performed.

Surface size is reported in ”application pixels”, not ”device pixels” (see gdk_surface_get_scale_factor()).

upcall

default void upcall(MemorySegment sourceSurface,
 int width,
 int height)

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

toCallback

default MemorySegment toCallback(Arena arena)

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

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer