since: 3.8

Declaration [src]

gtk_widget_set_opacity (
  GtkWidget* widget,
  double opacity

Description [src]

Request the widget to be rendered partially transparent, with opacity 0 being fully transparent and 1 fully opaque. (Opacity values are clamped to the [0,1] range.). This works on both toplevel widget, and child widgets, although there are some limitations:

For toplevel widgets this depends on the capabilities of the windowing system. On X11 this has any effect only on X screens with a compositing manager running. See gtk_widget_is_composited(). On Windows it should work always, although setting a window’s opacity after the window has been shown causes it to flicker once on Windows.

For child widgets it doesn’t work if any affected widget has a native window, or disables double buffering.

Available since: 3.8

Sets propertyGtk.Widget:opacity



Type: double

Desired opacity, between 0 and 1.