PrintOperation.CustomWidgetApplyCallback (java-gi API)

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.CustomWidgetApplyCallback extends FunctionPointer

Functional interface declaration of the CustomWidgetApplyCallback callback.

See Also:

Method Summary

Modifier and Type

Method

Description

void

run(Widget widget)

Emitted right before ::begin-print if you added a custom widget in the ::create-custom-widget handler.

default MemorySegment

toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.

default void

upcall(MemorySegment sourcePrintOperation, MemorySegment widget)

The upcall method is called from native code.

Method Details
- run
  
  void run(Widget widget)
  
  Emitted right before ::begin-print if you added a custom widget in the ::create-custom-widget handler.
  When you get this signal you should read the information from the custom widgets, as the widgets are not guaranteed to be around at a later time.
- upcall
  
  default void upcall(MemorySegment sourcePrintOperation, MemorySegment widget)
  
  The upcall method is called from native code. The parameters are marshaled and run(org.gnome.gtk.Widget) is executed.
- toCallback
  
  default MemorySegment toCallback(Arena arena)
  
  Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, 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