Package org.gnome.gtk

Interface DropTarget.DropCallback

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.DropCallback
extends FunctionPointer

Functional interface declaration of the DropCallback callback.

See Also:

• run(org.gnome.gobject.Value, double, double)

Method Summary

Modifier and Type	Method	Description
boolean	run(Value value, double x, double y)	Emitted on the drop site when the user drops the data onto the widget.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, double, double) method.
default int	upcall(MemorySegment sourceDropTarget, MemorySegment value, double x, double y)	The upcall method is called from native code.

Method Details

run

boolean run(Value value,
 double x,
 double y)

Emitted on the drop site when the user drops the data onto the widget.

The signal handler must determine whether the pointer position is in a drop zone or not. If it is not in a drop zone, it returns false and no further processing is necessary.

Otherwise, the handler returns true. In this case, this handler will accept the drop. The handler is responsible for using the given value and performing the drop operation.

upcall

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

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

toCallback

default MemorySegment toCallback(Arena arena)

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

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer