Interface Widget.UnmapCallback

All Superinterfaces:
FunctionPointer
Enclosing class:
Widget
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 Widget.UnmapCallback extends FunctionPointer

Functional interface declaration of the UnmapCallback callback.

See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    run()
    Emitted when widget is going to be unmapped.
    default MemorySegment
    toCallback(Arena arena)
    Creates a native function pointer to the upcall(MemorySegment) method.
    default void
    upcall(MemorySegment sourceWidget)
    The upcall method is called from native code.

  • Method Details

    • run

      void run()

      Emitted when widget is going to be unmapped.

      A widget is unmapped when either it or any of its parents up to the toplevel widget have been set as hidden.

      As ::unmap indicates that a widget will not be shown any longer, it can be used to, for example, stop an animation on the widget.

    • upcall

      default void upcall(MemorySegment sourceWidget)
      The upcall method is called from native code. The parameters are marshaled and run() is executed.

    • toCallback

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