GdkFrameClock* gtk_widget_get_frame_clock ( GtkWidget* widget )
Obtains the frame clock for a widget.
The frame clock is a global “ticker” that can be used to drive
animations and repaints. The most common reason to get the frame
clock is to call
gdk_frame_clock_get_frame_time(), in order
to get a time to use for animating. For example you might record
the start of the animation with an initial value from
gdk_frame_clock_get_frame_time(), and then update the animation
gdk_frame_clock_get_frame_time() again during each repaint.
gdk_frame_clock_request_phase() will result in a new frame on the
clock, but won’t necessarily repaint any widgets. To repaint a
widget, you have to use
gtk_widget_queue_draw() which invalidates
the widget (thus scheduling it to receive a draw on the next
gtk_widget_queue_draw() will also end up requesting a frame
on the appropriate frame clock.
A widget’s frame clock will not change while the widget is mapped. Reparenting a widget (which implies a temporary unmap) can change the widget’s frame clock.
Unrealized widgets do not have a frame clock.