Package org.gnome.gtk

Interface DragSource.DragBeginCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

DragSource

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 DragSource.DragBeginCallback
extends FunctionPointer

Functional interface declaration of the DragBeginCallback callback.

See Also:

• run(org.gnome.gdk.Drag)

Method Summary

Modifier and Type	Method	Description
void	run(Drag drag)	Emitted on the drag source when a drag is started.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.
default void	upcall(MemorySegment sourceDragSource, MemorySegment drag)	The upcall method is called from native code.

Method Details

run

void run(Drag drag)

Emitted on the drag source when a drag is started.

It can be used to e.g. set a custom drag icon with DragSource.setIcon(org.gnome.gdk.Paintable, int, int).

upcall

default void upcall(MemorySegment sourceDragSource,
 MemorySegment drag)

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

toCallback

default MemorySegment toCallback(Arena arena)

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