added SwingUtil.applyToHierarchy(Component c, SwingUtil.ComponentOp op)

git-svn-id: https://samskivert.googlecode.com/svn/trunk@795 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/swing/util/DialogUtil.java

@@ -1,5 +1,5 @@
 //
-// $Id: DialogUtil.java,v 1.1 2002/07/09 17:48:13 ray Exp $
+// $Id: DialogUtil.java,v 1.2 2002/07/10 01:53:59 ray Exp $
 
 package com.samskivert.swing.util;
 
@@ -60,23 +60,13 @@ public class DialogUtil
     public static void invalidateDialog (Component any)
     {
         JInternalDialog dialog = getInternalDialog(any);
-        invalidateChildren(dialog);
+        SwingUtil.applyToHierarchy(dialog, new SwingUtil.ComponentOp() {
+            public void apply (Component comp)
+            {
+                comp.invalidate();
+            }
+        });
 
         dialog.resize(dialog.getPreferredSize());
     }
-
-    /**
-     * Invalidate all the children of the specified container.
-     */
-    protected static void invalidateChildren (Container c)
-    {
-        int numkids = c.getComponentCount();
-        for (int ii=0; ii < numkids; ii++) {
-            Component child = c.getComponent(ii);
-            if (child instanceof Container) {
-                invalidateChildren((Container) child);
-            }
-            child.invalidate();
-        }
-    }
 }

projects/samskivert/src/java/com/samskivert/swing/util/SwingUtil.java

@@ -1,5 +1,5 @@
 //
-// $Id: SwingUtil.java,v 1.10 2002/06/14 07:55:11 shaper Exp $
+// $Id: SwingUtil.java,v 1.11 2002/07/10 01:53:59 ray Exp $
 //
 // samskivert library - useful routines for java programs
 // Copyright (C) 2001 Michael Bayne
@@ -142,21 +142,41 @@ public class SwingUtil
      * component, which is senseless in our opinion, but was surely done
      * for some arguably good reason.
      */
-    public static void setEnabled (Container comp, boolean enabled)
+    public static void setEnabled (Container comp, final boolean enabled)
     {
-        // set the state of our children
-        int ccount = comp.getComponentCount();
-        for (int i = 0; i < ccount; i++) {
-            Component child = comp.getComponent(i);
-            if (child instanceof Container) {
-                setEnabled((Container)child, enabled);
-            } else {
-                child.setEnabled(enabled);
+        applyToHierarchy(comp, new ComponentOp() {
+            public void apply (Component comp)
+            {
+                comp.setEnabled(enabled);
+            }
+        });
+    }
+
+    /**
+     * Apply the specified ComponentOp to the supplied component
+     * and then all its descendants.
+     */
+    public static void applyToHierarchy (Component comp, ComponentOp op)
+    {
+        op.apply(comp);
+        if (comp instanceof Container) {
+            Container c = (Container) comp;
+            int ccount = c.getComponentCount();
+            for (int ii=0; ii < ccount; ii++) {
+                applyToHierarchy(c.getComponent(ii), op);
             }
         }
+    }
 
-        // set our state
-        comp.setEnabled(enabled);
+    /**
+     * An operation that may be applied to a component.
+     */
+    public static interface ComponentOp
+    {
+        /**
+         * Apply an operation to the given component.
+         */
+        public void apply (Component comp);
     }
 
     /**