Added position config prop to Tween and Timeline. Timeline immediatel…

…y synchs added Tweens. Timeline checks for unchanged position before updating.

Signed-off-by: Grant Skinner <info@gskinner.com>

src/tweenjs/Timeline.js

@@ -47,6 +47,7 @@
  *    <LI> useTicks: uses ticks for all durations instead of milliseconds.</LI>
  *    <LI> ignoreGlobalPause: sets the ignoreGlobalPause property on this tween.</LI>
  *    <LI> paused: indicates whether to start the tween paused.</LI>
+ *    <LI> position: indicates the initial position for this timeline</LI>
  * </UL>
  * @constructor
  **/
@@ -139,6 +140,7 @@ var p = Timeline.prototype;
 		if (tweens) { this.addTween.apply(this, tweens); }
 		this.setLabels(labels);
 		if (!props||!props.paused) { Tween._register(this,true); }
+		if (props&&props.position!=null) { this.setPosition(props.position, Tween.NONE); }
 	}
 
 // public methods:
@@ -161,6 +163,7 @@ var p = Timeline.prototype;
 		tween._paused = false;
 		tween._useTicks = this._useTicks;
 		if (tween.duration > this.duration) { this.duration = tween.duration; }
+		tween.setPosition(this._prevPos, Tween.NONE);
 		return tween;
 	}
 
@@ -234,6 +237,7 @@ var p = Timeline.prototype;
 	p.setPosition = function(value, actionsMode) {
 		var t = this.loop ? value%this.duration : value;
 		var end = !this.loop && value >= this.duration;
+		if (t == this._prevPos) { return end; }
 		this._prevPosition = value;
 		this._prevPos = t; // in case an action changes the current frame.
 		for (var i=0, l=this._tweens.length; i<l; i++) {

src/tweenjs/Tween.js

@@ -35,7 +35,7 @@
 * @module TweenJS
 **/
 
-// TODO: possibly add a END actionsMode (only runs actions that == position)
+// TODO: possibly add a END actionsMode (only runs actions that == position)?
 // TODO: evaluate a way to decouple paused from tick registration.
 (function(window) {
 /**
@@ -109,6 +109,7 @@ var p = Tween.prototype;
 	 *    <LI> ignoreGlobalPause: sets the ignoreGlobalPause property on this tween.</LI>
 	 *    <LI> override: if true, Tween.removeTweens(target) will be called to remove any other tweens with the same target.
 	 *    <LI> paused: indicates whether to start the tween paused.</LI>
+	 *    <LI> position: indicates the initial position for this timeline</LI>
 	 * </UL>
 	 **/
 	Tween.get = function(target, props) {
@@ -333,6 +334,7 @@ var p = Tween.prototype;
 		this._actions = [];
 		this._catalog = [];
 		if (!props||!props.paused) { Tween._register(this,true); }
+		if (props&&props.position!=null) { this.setPosition(props.position, Tween.NONE); }
 	}
 
 // public methods: