Interface DropTarget.EnterCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

DropTarget

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 DropTarget.EnterCallback
extends FunctionPointer

Functional interface declaration of the EnterCallback callback.

See Also:

• run(double, double)

Method Summary

Modifier and Type	Method	Description
Set<DragAction>	run(double x, double y)	Emitted on the drop site when the pointer enters the widget.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(MemorySegment, double, double) method.
default int	upcall(MemorySegment sourceDropTarget, double x, double y)	The upcall method is called from native code.

Method Details

run

Set<DragAction> run(double x,
 double y)

Emitted on the drop site when the pointer enters the widget.

It can be used to set up custom highlighting.

upcall

default int upcall(MemorySegment sourceDropTarget,
 double x,
 double y)

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

toCallback

default MemorySegment toCallback(Arena arena)

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

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer