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:

  • 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(Drop) is executed.

    • toCallback

      default MemorySegment toCallback(Arena arena)
      Creates a native function pointer to the upcall(MemorySegment, MemorySegment) method.
      Specified by:
      toCallback in interface FunctionPointer
      Parameters:
      arena - the arena in which the function pointer is allocated
      Returns:
      the native function pointer