A helpful class for flex.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@795 ed5b42cb-e716-0410-a449-f6a68f950b19

src/as/com/threerings/flex/LoadedAsset.as

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+//
+// $Id$
+
+package com.threerings.flex {
+
+import flash.display.Loader;
+import flash.display.Sprite;
+
+import mx.core.IFlexAsset;
+import mx.core.IFlexDisplayObject;
+import mx.core.IInvalidating;
+
+import com.threerings.util.MultiLoader;
+
+/**
+ * An asset that can be used in Flex, that's loaded via a Loader.
+ */
+public class LoadedAsset extends Sprite
+    implements IFlexAsset, IFlexDisplayObject
+{
+    /**
+     * @param source a String (url) or URLRequest, or Class or a ByteArray.
+     */
+    public function LoadedAsset (source :Object) :void
+    {
+        MultiLoader.getLoaders(source, handleLoaded);
+    }
+
+    override public function get height () :Number
+    {
+        return (_loader == null) ? _measHeight : super.height;
+    }
+
+    override public function set height (value :Number) :void
+    {
+        if (_loader == null) {
+            _reqHeight = value;
+        } else {
+            _loader.height = value;
+        }
+    }
+
+    override public function get width () :Number
+    {
+        return (_loader == null) ? _measWidth : super.width;
+    }
+
+    override public function set width (value :Number) :void
+    {
+        if (_loader == null) {
+            _reqWidth = value;
+        } else {
+            _loader.width = value;
+        }
+    }
+
+    // from IFlexDisplayObject
+    public function get measuredHeight () :Number
+    {
+        return _measHeight;
+    }
+
+    // from IFlexDisplayObject
+    public function get measuredWidth () :Number
+    {
+        return _measWidth;
+    }
+
+    // from IFlexDisplayObject
+    public function move (x :Number, y :Number) :void
+    {
+        this.x = x;
+        this.y = y;
+    }
+
+    // from IFlexDisplayObject
+    public function setActualSize (newWidth :Number, newHeight :Number) :void
+    {
+        width = newWidth;
+        height = newHeight;
+    }
+
+    protected function handleLoaded (loader :Loader) :void
+    {
+        _loader = loader;
+        addChild(_loader);
+
+        // Note our measured size
+        _measWidth = loader.width;
+        _measHeight = loader.height;
+
+        // set any size that was set while we were being loaded
+        if (!isNaN(_reqWidth)) {
+            loader.width = _reqWidth;
+        }
+        if (!isNaN(_reqHeight)) {
+            loader.height = _reqHeight;
+        }
+
+        // if we have a parent that knows about sizes, tell it we now know our size
+        if (parent is IInvalidating) {
+            IInvalidating(parent).invalidateSize();
+        }
+    }
+
+    protected var _loader :Loader;
+
+    // initial / base sizes
+    protected var _measWidth :Number = 0;
+    protected var _measHeight :Number = 0;
+
+    // requested sizes, during loading
+    protected var _reqWidth :Number;
+    protected var _reqHeight :Number;
+}
+}