gtkWidgetQueueDrawArea {RGtk2} | R Documentation

## gtkWidgetQueueDrawArea

### Description

Invalidates the rectangular area of `widget` defined by `x`, `y`, `width` and `height` by calling `gdkWindowInvalidateRect` on the widget's window and all its child windows. Once the main loop becomes idle (after the current batch of events has been processed, roughly), the window will receive expose events for the union of all regions that have been invalidated.

### Usage

    gtkWidgetQueueDrawArea(object, x, y, width, height)

### Arguments

``object`` | a `GtkWidget`
``x`` | x coordinate of upper-left corner of rectangle to redraw
``y`` | y coordinate of upper-left corner of rectangle to redraw
``width`` | width of region to draw
``height`` | height of region to draw

### Details

Normally you would only use this function in widget implementations. You might also use it, or `gdkWindowInvalidateRect` directly, to schedule a redraw of a `GtkDrawingArea` or some portion thereof.

Frequently you can just call `gdkWindowInvalidateRect` or `gdkWindowInvalidateRegion` instead of this function. Those functions will invalidate only a single window, instead of the widget and all its children.

The advantage of adding to the invalidated region compared to simply drawing immediately is efficiency; using an invalid region ensures that you only have to redraw one time.

### Author(s)

Derived by RGtkGen from GTK+ documentation

[Package RGtk2 version 2.20.40 Index]