Interface DragSource.DragCancelCallback

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.DragCancelCallback
extends FunctionPointer

Functional interface declaration of the DragCancelCallback callback.

See Also:

• run(Drag, DragCancelReason)

Method Summary

Modifier and Type	Method	Description
boolean	run(@Nullable Drag drag, DragCancelReason reason)	Emitted on the drag source when a drag has failed.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(MemorySegment, MemorySegment, int) method.
default int	upcall(MemorySegment sourceDragSource, MemorySegment drag, int reason)	The upcall method is called from native code.

Method Details

run

boolean run(@Nullable Drag drag,
 DragCancelReason reason)

Emitted on the drag source when a drag has failed.

The signal handler may handle a failed drag operation based on the type of error. It should return true if the failure has been handled and the default "drag operation failed" animation should not be shown.

upcall

default int upcall(MemorySegment sourceDragSource,
 MemorySegment drag,
 int reason)

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

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(MemorySegment, MemorySegment, int) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer