Package org.gnome.gtk

Interface DropTargetAsync.AcceptCallback

All Superinterfaces:

FunctionPointer

Enclosing class:

DropTargetAsync

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 DropTargetAsync.AcceptCallback
extends FunctionPointer

Functional interface declaration of the AcceptCallback callback.

See Also:

• run(org.gnome.gdk.Drop)

Method Summary

Modifier and Type	Method	Description
boolean	run(Drop drop)	Emitted on the drop site when a drop operation is about to begin.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.
default int	upcall(MemorySegment sourceDropTargetAsync, MemorySegment drop)	The upcall method is called from native code.

Method Details

run

boolean run(Drop drop)

Emitted on the drop site when a drop operation is about to begin.

If the drop is not accepted, false will be returned and the drop target will ignore the drop. If true is returned, the drop is accepted for now but may be rejected later via a call to DropTargetAsync.rejectDrop(org.gnome.gdk.Drop) or ultimately by returning false from a Gtk.DropTargetAsync::drop handler.

The default handler for this signal decides whether to accept the drop based on the formats provided by the drop.

If the decision whether the drop will be accepted or rejected needs further processing, such as inspecting the data, this function should return true and proceed as is drop was accepted and if it decides to reject the drop later, it should call DropTargetAsync.rejectDrop(org.gnome.gdk.Drop).

upcall

default int upcall(MemorySegment sourceDropTargetAsync,
 MemorySegment drop)

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