--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/AbstractLayout.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,161 @@
+/*******************************************************************************
+ * 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.AbstractLayout;
+
+import dwt.dwthelper.utils;
+
+import dwtx.draw2d.geometry.Dimension;
+import dwtx.draw2d.IFigure;
+import dwtx.draw2d.LayoutManager;
+
+/**
+ * Provides generic support for LayoutManagers.
+ */
+public abstract class AbstractLayout
+    : LayoutManager
+{
+
+/**
+ * The cached preferred size.
+ */
+protected Dimension preferredSize;
+
+/**
+ * Whether or not this layout pays attention to visiblity of figures when
+ * calculating its bounds. By default, false.
+ */
+protected bool isObservingVisibility_ = false;
+
+/**
+ * This method is now {@link #calculatePreferredSize(IFigure, int, int)}.
+ * @param container the figure
+ */
+protected final void calculatePreferredSize(IFigure container) { }
+
+/**
+ * Calculates the preferred size of the given figure, using width and height hints.
+ * @param container The figure
+ * @param wHint The width hint
+ * @param hHint The height hint
+ * @return The preferred size
+ */
+protected abstract Dimension calculatePreferredSize(IFigure container,
+    int wHint, int hHint);
+
+/**
+ * Returns the preferred size of the figure's border.
+ * @param container The figure that the border is on
+ * @return The border's preferred size
+ */
+protected Dimension getBorderPreferredSize(IFigure container) {
+    if (container.getBorder() is null)
+        return new Dimension();
+    return container.getBorder().getPreferredSize(container);
+}
+
+/**
+ * Returns the constraint for the given figure.
+ * @param child The figure
+ * @return The constraint
+ */
+public Object getConstraint(IFigure child) {
+    return null;
+}
+
+/**
+ * This method is now {@link #getMinimumSize(IFigure, int, int)}.
+ * @param container the figure
+ */
+public final void getMinimumSize(IFigure container) { }
+
+/**
+ * @see dwtx.draw2d.LayoutManager#getMinimumSize(IFigure, int, int)
+ */
+public Dimension getMinimumSize(IFigure container, int wHint, int hHint) {
+    return getPreferredSize(container, wHint, hHint);
+}
+
+/**
+ * Returns the preferred size of the given figure, using width and height hints.  If the
+ * preferred size is cached, that size  is returned.  Otherwise, {@link
+ * #calculatePreferredSize(IFigure, int, int)} is called.
+ * @param container The figure
+ * @param wHint The width hint
+ * @param hHint The height hint
+ * @return The preferred size
+ */
+public Dimension getPreferredSize(IFigure container, int wHint, int hHint) {
+    if (preferredSize is null)
+        preferredSize = calculatePreferredSize(container, wHint, hHint);
+    return preferredSize;
+}
+
+/**
+ * This method is now {@link #getPreferredSize(IFigure, int, int)}.
+ * @param container the figure
+ */
+public final void getPreferredSize(IFigure container) { }
+
+
+/**
+ * @see dwtx.draw2d.LayoutManager#invalidate()
+ */
+public void invalidate() {
+    preferredSize = null;
+}
+
+/**
+ * Removes any cached information about the given figure.
+ * @param child the child that is invalidated
+ */
+protected void invalidate(IFigure child) {
+    invalidate();
+}
+
+/**
+ * Returns whether or not this layout pays attention to visiblity when calculating its
+ * bounds.
+ * @return true if invisible figures should not contribute to this layout's bounds.
+ */
+public bool isObservingVisibility() {
+    return isObservingVisibility_;
+}
+
+/**
+ * Removes the given figure from this LayoutManager's list of figures.
+ * @param child The figure to remove
+ */
+public void remove(IFigure child) {
+    invalidate();
+}
+
+/**
+ * Sets the constraint for the given figure.
+ * @param child the child
+ * @param constraint the child's new constraint
+ */
+public void setConstraint(IFigure child, Object constraint) {
+    invalidate(child);
+}
+
+/**
+ * Sets isObservingVisibility to the given value.
+ * @param newValue <code>true</code> if visibility should be observed
+ */
+public void setObserveVisibility(bool newValue) {
+    if (isObservingVisibility_ is newValue)
+        return;
+    isObservingVisibility_ = newValue;
+}
+
+}