Interface EventControllerFocus.EnterCallback

All Superinterfaces:
FunctionPointer
Enclosing class:
EventControllerFocus
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 EventControllerFocus.EnterCallback extends FunctionPointer

Functional interface declaration of the EnterCallback callback.

See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    run()
    Emitted whenever the focus enters into the widget or one of its descendents.
    default MemorySegment
    toCallback(Arena arena)
    Creates a native function pointer to the upcall(MemorySegment) method.
    default void
    upcall(MemorySegment sourceEventControllerFocus)
    The upcall method is called from native code.

  • Method Details

    • run

      void run()

      Emitted whenever the focus enters into the widget or one of its descendents.

      Note that this means you may not get an ::enter signal even though the widget becomes the focus location, in certain cases (such as when the focus moves from a descendent of the widget to the widget itself). If you are interested in these cases, you can monitor the Gtk.EventControllerFocus:is-focus property for changes.

    • upcall

      default void upcall(MemorySegment sourceEventControllerFocus)
      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