Package org.gnome.gtk

Interface DropTarget.AcceptCallback

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.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(@Nullable 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 sourceDropTarget, MemorySegment drop)	The upcall method is called from native code.

Method Details

run

boolean run(@Nullable 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 DropTarget.reject() or ultimately by returning false from a Gtk.DropTarget::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 depends on the data, this function should return true, the Gtk.DropTarget:preload property should be set and the value should be inspected via the ::notify:value signal, calling DropTarget.reject() if required.

upcall

default int upcall(MemorySegment sourceDropTarget,
 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 arena in which the function pointer is allocated

Returns:

the native function pointer