Package ch.bailu.gtk.gtk

Interface DrawingArea.OnDrawingAreaDrawFunc

Enclosing class:

DrawingArea

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 DrawingArea.OnDrawingAreaDrawFunc

Method Summary

Modifier and Type	Method	Description
void	onDrawingAreaDrawFunc(CallbackHandler __self, DrawingArea drawing_area, Context cr, int width, int height, Pointer user_data)	Whenever @drawing_area needs to redraw, this function will be called.

Method Details

onDrawingAreaDrawFunc

void onDrawingAreaDrawFunc(CallbackHandler __self,
 @Nonnull
 DrawingArea drawing_area,
 @Nonnull
 Context cr,
 int width,
 int height,
 @Nullable
 Pointer user_data)

Whenever @drawing_area needs to redraw, this function will be called.

This function should exclusively redraw the contents of the drawing area
and must not call any widget functions that cause changes.

Parameters:

drawing_area - the `GtkDrawingArea` to redraw

cr - the context to draw to

width - the actual width of the contents. This value will be at least as wide as GtkDrawingArea:width.

height - the actual height of the contents. This value will be at least as wide as GtkDrawingArea:height.

user_data - user data