Interface FontButton.FontSetCallback

All Superinterfaces:
FunctionPointer
Enclosing class:
FontButton
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 FontButton.FontSetCallback extends FunctionPointer

Functional interface declaration of the FontSetCallback callback.

See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    run()
    Emitted when the user selects a font.
    default MemorySegment
    toCallback(Arena arena)
    Creates a native function pointer to the upcall(MemorySegment) method.
    default void
    upcall(MemorySegment sourceFontButton)
    The upcall method is called from native code.

  • Method Details

    • run

      void run()

      Emitted when the user selects a font.

      When handling this signal, use FontChooser.getFont() to find out which font was just selected.

      Note that this signal is only emitted when the user changes the font. If you need to react to programmatic font changes as well, use the notify::font signal.

    • upcall

      default void upcall(MemorySegment sourceFontButton)
      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