void gtk_widget_set_opacity ( GtkWidget* widget, double opacity )
widget to be rendered partially transparent.
An opacity of 0 is fully transparent and an opacity of 1 is fully opaque.
Opacity works on both toplevel widgets and child widgets, although
there are some limitations: For toplevel widgets, applying opacity
depends on the capabilities of the windowing system. On X11, this
has any effect only on X displays with a compositing manager,
gdk_display_is_composited(). On Windows and Wayland it should
always work, although setting a window’s opacity after the window
has been shown may cause some flicker.
Note that the opacity is inherited through inclusion — if you set
a toplevel to be partially translucent, all of its content will
appear translucent, since it is ultimatively rendered on that
toplevel. The opacity value itself is not inherited by child
widgets (since that would make widgets deeper in the hierarchy
progressively more translucent). As a consequence,
GtkNative widgets with their own surface will use their
own opacity value, and thus by default appear non-translucent,
even if they are attached to a toplevel that is translucent.