Package org.gnome.gtk

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:

• run()

Method Summary

Modifier and Type	Method	Description
GObject	run()	Emitted when displaying the print dialog.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment) method.
default MemorySegment	upcall(MemorySegment sourcePrintOperation)	The upcall method is called from native code.

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(java.lang.foreign.MemorySegment) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer