Package org.gnome.gtk

Interface Widget.MapCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

Widget

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 Widget.MapCallback
extends FunctionPointer

Functional interface declaration of the MapCallback callback.

See Also:

• run()

Method Summary

Modifier and Type	Method	Description
void	run()	Emitted when widget is going to be mapped.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment) method.
default void	upcall(MemorySegment sourceWidget)	The upcall method is called from native code.

Method Details

run

void run()

Emitted when widget is going to be mapped.

A widget is mapped when the widget is visible (which is controlled with Gtk.Widget:visible) and all its parents up to the toplevel widget are also visible.

The ::map signal can be used to determine whether a widget will be drawn, for instance it can resume an animation that was stopped during the emission of Gtk.Widget::unmap.

upcall

default void upcall(MemorySegment sourceWidget)

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