--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/DelegatingLayout.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,102 @@
+/*******************************************************************************
+ * 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.DelegatingLayout;
+
+import dwt.dwthelper.utils;
+import dwtx.dwtxhelper.Collection;
+
+import dwtx.draw2d.geometry.Dimension;
+import dwtx.draw2d.IFigure;
+import dwtx.draw2d.AbstractLayout;
+import dwtx.draw2d.Locator;
+
+/**
+ * Figures using a DelegatingLayout as their layout manager give
+ * location responsibilities to their children. The children
+ * of a Figure using a DelegatingLayout should have a
+ * {@link Locator Locator} as a constraint whose
+ * {@link Locator#relocate(IFigure target) relocate} method is
+ * responsible for placing the child.
+ */
+public class DelegatingLayout
+    : AbstractLayout
+{
+
+private Map constraints;
+
+this(){
+    constraints = new HashMap();
+}
+/**
+ * Calculates the preferred size of the given Figure.
+ * For the DelegatingLayout, this is the largest width and height
+ * values of the passed Figure's children.
+ *
+ * @param parent the figure whose preferred size is being calculated
+ * @param wHint the width hint
+ * @param hHint the height hint
+ * @return the preferred size
+ * @since 2.0
+ */
+protected Dimension calculatePreferredSize(IFigure parent, int wHint, int hHint) {
+    List children = parent.getChildren();
+    Dimension d = new Dimension();
+    for (int i = 0; i < children.size(); i++) {
+        IFigure child = cast(IFigure)children.get(i);
+        d.union_(child.getPreferredSize());
+    }
+    return d;
+}
+
+/**
+ * @see dwtx.draw2d.LayoutManager#getConstraint(dwtx.draw2d.IFigure)
+ */
+public Object getConstraint(IFigure child) {
+    return constraints.get(cast(Object)child);
+}
+
+/**
+ * Lays out the given figure's children based on their {@link Locator} constraint.
+ * @param parent the figure whose children should be layed out
+ */
+public void layout(IFigure parent) {
+    List children = parent.getChildren();
+    for (int i = 0; i < children.size(); i++) {
+        IFigure child = cast(IFigure)children.get(i);
+        Locator locator = cast(Locator)constraints.get(cast(Object)child);
+        if (locator !is null) {
+            locator.relocate(child);
+        }
+    }
+}
+
+/**
+ * Removes the locator for the given figure.
+ * @param child the child being removed
+ */
+public void remove(IFigure child) {
+    constraints.remove(cast(Object)child);
+}
+
+/**
+ * Sets the constraint for the given figure.
+ * @param figure the figure whose contraint is being set
+ * @param constraint the new constraint
+ */
+public void setConstraint(IFigure figure, Object constraint) {
+    super.setConstraint(figure, constraint);
+    if (constraint !is null)
+        constraints.put(cast(Object)figure, constraint);
+}
+
+}