RESOLVED - bug 353963: SwingScoutTree Bad performance when building a large JTree.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=353963

1 files changed, 10 insertions, 0 deletions

diff --git a/org.eclipse.scout.rt.ui.swing/src/org/eclipse/scout/rt/ui/swing/ext/JTreeEx.java b/org.eclipse.scout.rt.ui.swing/src/org/eclipse/scout/rt/ui/swing/ext/JTreeEx.java
index 4742ad43a3..a0023e39db 100644
--- a/org.eclipse.scout.rt.ui.swing/src/org/eclipse/scout/rt/ui/swing/ext/JTreeEx.java
+++ b/org.eclipse.scout.rt.ui.swing/src/org/eclipse/scout/rt/ui/swing/ext/JTreeEx.java
@@ -17,6 +17,7 @@ import java.awt.Point;
 import java.awt.Rectangle;

 import java.awt.dnd.DropTarget;

 import java.awt.event.MouseEvent;

+import java.util.Enumeration;

 

 import javax.swing.BorderFactory;

 import javax.swing.JTree;

@@ -61,6 +62,15 @@ public class JTreeEx extends JTree {
     ToolTipManager.sharedInstance().registerComponent(this);

   }

 

+  //Performance optimization. See: http://hameister.org/JavaSwingJTreePerformance.html

+  //the plaf library calls this method to update the expanded state of a path.

+  //However, the implementation in JTree is very slow, and there is probably no use

+  //for this functionality in Scout.

+  @Override

+  public Enumeration<TreePath> getExpandedDescendants(final TreePath path) {

+    return null;

+  }

+

   /**

    * workaround for bug in swing when using custom tooltips

    */