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Add dontLink argument to Item#getPosition()

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And use it to optimise up #setPosition().
This commit is contained in:
Jürg Lehni 2011-11-30 18:18:24 +01:00
parent bb1d436281
commit a3ec184873
1 changed files with 10 additions and 6 deletions
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16
src/item/Item.js
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@ -259,20 +259,24 @@ var Item = this.Item = Base.extend(Callback, /** @lends Item# */{
* // Move the circle 100 points to the right
* circle.position.x += 100;
*/
getPosition: function() {
// Cache position value
getPosition: function(/* dontLink */) {
// Cache position value.
// Pass true for dontLink in getCenter(), so receive back a normal point
var pos = this._position
|| (this._position = this.getBounds().getCenter());
// this._position is a LinkedPoint as well, so we can use _x and _y.
|| (this._position = this.getBounds().getCenter(true));
// Do not cache LinkedPoints directly, since we would not be able to
// use them to calculate the difference in #setPosition, as when it is
// modified, it would hold new values already and only then cause the
// calling of #setPosition.
return LinkedPoint.create(this, 'setPosition', pos._x, pos._y);
return arguments[0] ? pos
: LinkedPoint.create(this, 'setPosition', pos.x, pos.y);
},
setPosition: function(point) {
this.translate(Point.read(arguments).subtract(this.getPosition()));
// Calculate the distance to the current position, by which to
// translate the item. Pass true for dontLink, as we do not need a
// LinkedPoint to simply calculate this distance.
this.translate(Point.read(arguments).subtract(this.getPosition(true)));
},
/**