A JLayeredPane that gets around an awt/swing bug by removing all popups

whenever any component is removed. Whee.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@1198 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/swing/SafeLayeredPane.java

@@ -0,0 +1,39 @@
+//
+// $Id: SafeLayeredPane.java,v 1.1 2003/08/14 22:05:07 ray Exp $
+
+package com.samskivert.swing;
+
+import java.awt.Component;
+import javax.swing.JLayeredPane;
+
+/**
+ * A JLayeredPane that removes all popups when any component is removed.
+ * This gets around an apparent bug in awt/swing that fucks up hard when
+ * a component is removed and a popup is up.
+ */
+public class SafeLayeredPane extends JLayeredPane
+{
+    public void remove (int index)
+    {
+        Component c = getComponent(index);
+
+        // remove all popups
+        boolean removedPops = false;
+        for (int ii=getComponentCount() - 1; ii >= 0; ii--) {
+            if (getLayer(getComponent(ii)) == POPUP_LAYER.intValue()) {
+                super.remove(ii);
+                removedPops = true;
+            }
+        }
+
+        // if we removed any popups, the index may have changed so we
+        // need to remove by reference
+        if (removedPops) {
+            remove(c); // which will end up calling this method again, but
+            // the second time the popups will already be gone
+
+        } else {
+            super.remove(index);
+        }
+    }
+}