Package org.gnome.gtk

Interface GLArea.ResizeCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

GLArea

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 GLArea.ResizeCallback
extends FunctionPointer

Functional interface declaration of the ResizeCallback callback.

See Also:

• run(int, int)

Method Summary

Modifier and Type	Method	Description
void	run(int width, int height)	Emitted once when the widget is realized, and then each time the widget is changed while realized.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, int, int) method.
default void	upcall(MemorySegment sourceGLArea, int width, int height)	The upcall method is called from native code.

Method Details

run

void run(int width,
 int height)

Emitted once when the widget is realized, and then each time the widget is changed while realized.

This is useful in order to keep GL state up to date with the widget size, like for instance camera properties which may depend on the width/height ratio.

The GL context for the area is guaranteed to be current when this signal is emitted.

The default handler sets up the GL viewport.

upcall

default void upcall(MemorySegment sourceGLArea,
 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