5

get_frame_clock

 1 year ago
source link: https://docs.gtk.org/gtk4/method.Widget.get_frame_clock.html
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Method

GtkWidgetget_frame_clock

[−]

Declaration [src] 

GdkFrameClock*
gtk_widget_get_frame_clock (
  GtkWidget* widget
)
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Description [src]

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 by calling 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 frame). 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.

[−]

Return value

Type: GdkFrameClock

A GdkFrameClock

The data is owned by the instance.
The return value can be NULL.

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