Interface PrintOperation.CreateCustomWidgetCallback

All Superinterfaces:
FunctionPointer
Enclosing class:
PrintOperation
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 PrintOperation.CreateCustomWidgetCallback extends FunctionPointer

Functional interface declaration of the CreateCustomWidgetCallback callback.

See Also:

  • Method Details

    • run

      GObject run()

      Emitted when displaying the print dialog.

      If you return a widget in a handler for this signal it will be added to a custom tab in the print dialog. You typically return a container widget with multiple widgets in it.

      The print dialog owns the returned widget, and its lifetime is not controlled by the application. However, the widget is guaranteed to stay around until the Gtk.PrintOperation::custom-widget-apply signal is emitted on the operation. Then you can read out any information you need from the widgets.

    • upcall

      default MemorySegment upcall(MemorySegment sourcePrintOperation)
      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