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small optimization for the DisplayUtil.sortDisplayChildren common case

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git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@546 ed5b42cb-e716-0410-a449-f6a68f950b19
This commit is contained in:
Tom Conkling
2008-06-19 20:10:06 +00:00
parent f6b35f8217
commit 8168128b0f
1 changed files with 13 additions and 5 deletions
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src/as/com/threerings/flash/DisplayUtil.as
+13 -5
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@@ -43,22 +43,30 @@ public class DisplayUtil
container :DisplayObjectContainer, comp :Function = null) :void container :DisplayObjectContainer, comp :Function = null) :void
{ {
var numChildren :int = container.numChildren; var numChildren :int = container.numChildren;
// put all children in an array
var children :Array = new Array(numChildren); // since it's likely this function will be called frequently on the same
// DisplayObjectContainer, keep the Array around so that we're not
// re-allocating memory more often than we need to
if (_sortDisplayChildrenArray.length != numChildren) {
_sortDisplayChildrenArray = new Array(numChildren);
}
var ii :int; var ii :int;
for (ii = 0; ii < numChildren; ii++) { for (ii = 0; ii < numChildren; ii++) {
children[ii] = container.getChildAt(ii); _sortDisplayChildrenArray[ii] = container.getChildAt(ii);
} }
// stable sort the array // stable sort the array
ArrayUtil.stableSort(children, comp); ArrayUtil.stableSort(_sortDisplayChildrenArray, comp);
// set their new indexes // set their new indexes
for (ii = 0; ii < numChildren; ii++) { for (ii = 0; ii < numChildren; ii++) {
container.setChildIndex(DisplayObject(children[ii]), ii); container.setChildIndex(DisplayObject(_sortDisplayChildrenArray[ii]), ii);
} }
} }
private static var _sortDisplayChildrenArray :Array = [];
/** /**
* Call the specified function for the display object and all descendants. * Call the specified function for the display object and all descendants.
* *