From 507929ecc99296f4538da0de2a52326dac86548d Mon Sep 17 00:00:00 2001
From: ray <ray@6335cc39-0255-0410-8fd6-9bcaacd3b74c>
Date: Fri, 21 May 2004 20:53:08 +0000
Subject: [PATCH] Modified the way the controlled panel is monitored. It should
 work the same as before, but will count as being displayed even if in a
 non-showing tab.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@1434 6335cc39-0255-0410-8fd6-9bcaacd3b74c
---
 .../java/com/samskivert/swing/Controller.java | 31 +++++++++++++------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/projects/samskivert/src/java/com/samskivert/swing/Controller.java b/projects/samskivert/src/java/com/samskivert/swing/Controller.java
index 89743169..61d4274a 100644
--- a/projects/samskivert/src/java/com/samskivert/swing/Controller.java
+++ b/projects/samskivert/src/java/com/samskivert/swing/Controller.java
@@ -1,5 +1,5 @@
 //
-// $Id: Controller.java,v 1.17 2004/01/16 15:25:29 mdb Exp $
+// $Id: Controller.java,v 1.18 2004/05/21 20:53:08 ray Exp $
 //
 // samskivert library - useful routines for java programs
 // Copyright (C) 2001 Michael Bayne
@@ -29,10 +29,11 @@ import java.lang.reflect.Method;
 
 import javax.swing.JButton;
 import javax.swing.JComponent;
-import javax.swing.event.AncestorEvent;
+
+import java.awt.event.HierarchyEvent;
+import java.awt.event.HierarchyListener;
 
 import com.samskivert.Log;
-import com.samskivert.swing.event.AncestorAdapter;
 import com.samskivert.swing.event.CommandEvent;
 
 /**
@@ -103,15 +104,25 @@ public abstract class Controller
     /**
      * Lets this controller know about the panel that it is controlling.
      */
-    public void setControlledPanel (JComponent panel)
+    public void setControlledPanel (final JComponent panel)
     {
-        panel.addAncestorListener(new AncestorAdapter() {
-            public void ancestorAdded (AncestorEvent event) {
-                wasAdded();
-            }
-            public void ancestorRemoved (AncestorEvent event) {
-                wasRemoved();
+        panel.addHierarchyListener(new HierarchyListener() {
+            public void hierarchyChanged (HierarchyEvent e) {
+                boolean nowShowing = panel.isDisplayable();
+                //System.err.println("Controller." + Controller.this +
+                //    "  nowShowing=" + nowShowing +
+                //    ", wasShowing=" + _showing);
+                if (_showing != nowShowing) {
+                    _showing = nowShowing;
+                    if (_showing) {
+                        wasAdded();
+                    } else {
+                        wasRemoved();
+                    }
+                }
             }
+
+            boolean _showing = false;
         });
     }