--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/FreeformHelper.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,116 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.draw2d.FreeformHelper;
+
+import dwt.dwthelper.utils;
+import dwtx.dwtxhelper.Collection;
+
+import dwtx.draw2d.geometry.Insets;
+import dwtx.draw2d.geometry.Rectangle;
+import dwtx.draw2d.FreeformListener;
+import dwtx.draw2d.FreeformFigure;
+import dwtx.draw2d.IFigure;
+import dwtx.draw2d.FigureListener;
+
+class FreeformHelper
+    : FreeformListener
+{
+
+class ChildTracker : FigureListener {
+    public void figureMoved(IFigure source) {
+        invalidate();
+    }
+}
+
+private FreeformFigure host;
+private Rectangle freeformExtent;
+private FigureListener figureListener;
+
+private void instanceInit(){
+    figureListener = new ChildTracker();
+}
+this(FreeformFigure host) {
+    instanceInit();
+    this.host = host;
+}
+
+public Rectangle getFreeformExtent() {
+    if (freeformExtent !is null)
+        return freeformExtent;
+    Rectangle r;
+    List children = host.getChildren();
+    for (int i = 0; i < children.size(); i++) {
+        IFigure child = cast(IFigure)children.get(i);
+        if (null !is cast(FreeformFigure) child )
+            r = (cast(FreeformFigure) child).getFreeformExtent();
+        else
+            r = child.getBounds();
+        if (freeformExtent is null)
+            freeformExtent = r.getCopy();
+        else
+            freeformExtent.union_(r);
+    }
+    Insets insets = host.getInsets();
+    if (freeformExtent is null)
+        freeformExtent = new Rectangle(0, 0, insets.getWidth(), insets.getHeight());
+    else {
+        host.translateToParent(freeformExtent);
+        freeformExtent.expand(insets);
+    }
+//  System.out.println("New extent calculated for " + host + " = " + freeformExtent);
+    return freeformExtent;
+}
+
+public void hookChild(IFigure child) {
+    invalidate();
+    if (null !is cast(FreeformFigure)child )
+        (cast(FreeformFigure)child).addFreeformListener(this);
+    else
+        child.addFigureListener(figureListener);
+}
+
+void invalidate() {
+    freeformExtent = null;
+    host.fireExtentChanged();
+    if (host.getParent() !is null)
+        host.getParent().revalidate();
+    else
+        host.revalidate();
+}
+
+public void notifyFreeformExtentChanged() {
+    //A childs freeform extent has changed, therefore this extent must be recalculated
+    invalidate();
+}
+
+public void setFreeformBounds(Rectangle bounds) {
+    host.setBounds(bounds);
+    bounds = bounds.getCopy();
+    host.translateFromParent(bounds);
+    List children = host.getChildren();
+    for (int i = 0; i < children.size(); i++) {
+        IFigure child = cast(IFigure)children.get(i);
+        if (null !is cast(FreeformFigure)child )
+            (cast(FreeformFigure) child).setFreeformBounds(bounds);
+    }
+}
+
+public void unhookChild(IFigure child) {
+    invalidate();
+    if (null !is cast(FreeformFigure)child )
+        (cast(FreeformFigure)child).removeFreeformListener(this);
+    else
+        child.removeFigureListener(figureListener);
+}
+
+}