Package org.gnome.gtk

Interface DrawingAreaDrawFunc

All Superinterfaces:

FunctionPointer

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
@Generated("io.github.jwharm.JavaGI")
public interface DrawingAreaDrawFunc
extends FunctionPointer

Functional interface declaration of the DrawingAreaDrawFunc callback.

See Also:

• run(org.gnome.gtk.DrawingArea, org.freedesktop.cairo.Context, int, int)

Method Summary

Modifier and Type	Method	Description
void	run(DrawingArea drawingArea, org.freedesktop.cairo.Context cr, int width, int height)	Whenever drawingArea needs to redraw, this function will be called.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, int, int, java.lang.foreign.MemorySegment) method.
default void	upcall(MemorySegment drawingArea, MemorySegment cr, int width, int height, MemorySegment userData)	The upcall method is called from native code.

Method Details

run

void run(DrawingArea drawingArea,
 org.freedesktop.cairo.Context cr,
 int width,
 int height)

Whenever drawingArea needs to redraw, this function will be called.

This function should exclusively redraw the contents of the drawing area and must not call any widget functions that cause changes.

upcall

default void upcall(MemorySegment drawingArea,
 MemorySegment cr,
 int width,
 int height,
 MemorySegment userData)

The upcall method is called from native code. The parameters are marshaled and run(org.gnome.gtk.DrawingArea, org.freedesktop.cairo.Context, int, int) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

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