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Merge remote branch 'elliot/cookbook-animations-looping-new-api'
* elliot/cookbook-animations-looping-new-api: cookbook: Use new API to reverse timeline
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@ -2372,7 +2372,7 @@ clutter_actor_animate_with_timeline (actor,
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</programlisting>
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</informalexample>
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<para>One further technique is to swop the timeline's
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<para>One further technique is to repeatedly reverse the timeline's
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direction to create a "closed loop" animation (one which returns
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to its origin at the end of each iteration). See
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<link linkend="animations-looping-discussion-closed-loop">this
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@ -2655,12 +2655,23 @@ timeline_completed_cb (ClutterTimeline *timeline,
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animations, one the inverse of the other, and chaining them together.</para>
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<para>However, a simpler solution is to run forward through the timeline
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once; then invert its direction when the end of timeline is reached.
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The animation continues, but in reverse. Once the backward iteration
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completes, set the timeline to run forward again. Keep changing the
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timeline's direction each time it completes. This
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is the approach used in <link linkend="animations-looping-example-1">the
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example</link>, which results in a smooth, repeated right to left,
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once, and have the timeline invert itself when its end is reached.
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The animation then continues, but in reverse. Once the backward iteration
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completes, the timeline sets itself to run forward again, etc.</para>
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<para>To make a timeline reverse its direction each time it
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completes, use the <function>clutter_timeline_set_reverse()</function>
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function:</para>
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<informalexample>
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<programlisting>
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clutter_timeline_set_reverse (timeline, TRUE);
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</programlisting>
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</informalexample>
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<para>This is the approach used in
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<link linkend="animations-looping-example-1">the example</link>,
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which results in a smooth, repeated right to left,
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left to right motion.</para>
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<para>See <link linkend="animations-inversion">this
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@ -10,20 +10,6 @@ typedef struct
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ClutterTimeline *timeline;
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} State;
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static void
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invert_timeline_cb (ClutterTimeline *timeline,
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gpointer user_data)
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{
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ClutterTimelineDirection direction = clutter_timeline_get_direction (timeline);
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if (direction == CLUTTER_TIMELINE_FORWARD)
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direction = CLUTTER_TIMELINE_BACKWARD;
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else
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direction = CLUTTER_TIMELINE_FORWARD;
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clutter_timeline_set_direction (timeline, direction);
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}
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static gboolean
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key_pressed_cb (ClutterActor *actor,
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ClutterEvent *event,
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@ -63,21 +49,13 @@ main (int argc,
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state->timeline = clutter_timeline_new (1000);
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clutter_timeline_set_loop (state->timeline, TRUE);
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clutter_timeline_set_reverse (state->timeline, TRUE);
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g_signal_connect (stage,
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"key-press-event",
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G_CALLBACK (key_pressed_cb),
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state);
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/* the animation will not emit a "completed" signal,
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* as it is set to loop; but the timeline emits "completed"
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* at the end of each iteration of the loop
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*/
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g_signal_connect (state->timeline,
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"completed",
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G_CALLBACK (invert_timeline_cb),
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NULL);
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), state->actor);
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clutter_actor_show (stage);
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