Package org.gnome.gtk

Interface GLArea.CreateContextCallback

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.CreateContextCallback
extends FunctionPointer

Functional interface declaration of the CreateContextCallback callback.

See Also:

• run()

Method Summary

Modifier and Type	Method	Description
GLContext	run()	Emitted when the widget is being realized.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment) method.
default MemorySegment	upcall(MemorySegment sourceGLArea)	The upcall method is called from native code.

Method Details

run

GLContext run()

Emitted when the widget is being realized.

This allows you to override how the GL context is created. This is useful when you want to reuse an existing GL context, or if you want to try creating different kinds of GL options.

If context creation fails then the signal handler can use GLArea.setError(org.gnome.glib.GError) to register a more detailed error of how the construction failed.

upcall

default MemorySegment upcall(MemorySegment sourceGLArea)

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

toCallback

default MemorySegment toCallback(Arena arena)

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

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer