Allow the sprite action handler to be customized.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3722 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/MediaPanel.java

@@ -196,7 +196,7 @@ public class MediaPanel extends JComponent
         if (((sprite instanceof ActionSprite) ||
              (sprite instanceof HoverSprite)) && (_actionSpriteCount++ == 0)) {
             if (_actionHandler == null) {
-                _actionHandler = new ActionSpriteHandler();
+                _actionHandler = createActionSpriteHandler();
             }
             addMouseListener(_actionHandler);
             addMouseMotionListener(_actionHandler);
@@ -609,6 +609,15 @@ public class MediaPanel extends JComponent
         }
     }
 
+    /**
+     * Creates the mouse listener that will handle action sprites and their
+     * variants.
+     */
+    protected ActionSpriteHandler createActionSpriteHandler ()
+    {
+        return new ActionSpriteHandler();
+    }
+
     /** The frame manager with whom we register. */
     protected FrameManager _framemgr;