def to_invisible(
widget: Gtk.Widget,
duration: int = 600) -> bool:
"""Animate the opacity from 1 to 0 for duration in milliseconds."""
frame_clock = widget.get_frame_clock()
start_time = frame_clock.get_frame_time()
end_time = start_time + 1000*duration
if hasattr(widget, 'anime_id') \
and widget.anime_id:
widget.remove_tick_callback(widget.anime_id)
def animate(
widget: Gtk.Widget,
frame_clock: Gdk.FrameClock) -> bool:
current_time = frame_clock.get_frame_time()
if current_time < end_time \
and widget.get_opacity() > 0:
t = (current_time-start_time) / (end_time-start_time)
t = 1 - Animation.ease_out_cubic(t)
widget.set_opacity(t)
return GLib.SOURCE_CONTINUE
else:
widget.anime_id = None
return GLib.SOURCE_REMOVE
widget.anime_id = widget.add_tick_callback(animate)
return False
def animate(
widget: Gtk.Widget,
frame_clock: Gdk.FrameClock) -> bool:
current_time = frame_clock.get_frame_time()
if current_time < end_time \
and widget.get_opacity() > 0:
t = (current_time-start_time) / (end_time-start_time)
t = 1 - Animation.ease_out_cubic(t)
widget.set_opacity(t)
return GLib.SOURCE_CONTINUE
else:
widget.anime_id = None
return GLib.SOURCE_REMOVE
