--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/custom/ScrolledCompositeLayout.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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
+ *******************************************************************************/
+module dwt.custom;
+
+import dwt.*;
+import dwt.graphics.*;
+import dwt.widgets.*;
+
+/**
+ * This class provides the layout for ScrolledComposite
+ * 
+ * @see ScrolledComposite
+ */
+class ScrolledCompositeLayout : Layout {
+    
+    bool inLayout = false;
+    static final int DEFAULT_WIDTH  = 64;
+    static final int DEFAULT_HEIGHT = 64;
+    
+protected Point computeSize(Composite composite, int wHint, int hHint, bool flushCache) {
+    ScrolledComposite sc = (ScrolledComposite)composite;
+    Point size = new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT);
+    if (sc.content !is null) {
+        Point preferredSize = sc.content.computeSize(wHint, hHint, flushCache);
+        Point currentSize = sc.content.getSize();
+        size.x = sc.getExpandHorizontal() ? preferredSize.x : currentSize.x;
+        size.y = sc.getExpandVertical() ? preferredSize.y : currentSize.y;
+    }
+    size.x = Math.max(size.x, sc.minWidth);
+    size.y = Math.max(size.y, sc.minHeight);
+    if (wHint !is DWT.DEFAULT) size.x = wHint;
+    if (hHint !is DWT.DEFAULT) size.y = hHint;
+    return size;
+}
+
+protected bool flushCache(Control control) {
+    return true;
+}
+
+protected void layout(Composite composite, bool flushCache) {
+    if (inLayout) return;
+    ScrolledComposite sc = (ScrolledComposite)composite;
+    if (sc.content is null) return;
+    ScrollBar hBar = sc.getHorizontalBar();
+    ScrollBar vBar = sc.getVerticalBar();
+    if (hBar !is null) {
+        if (hBar.getSize().y >= sc.getSize().y) {
+            return;
+        }
+    }
+    if (vBar !is null) {
+        if (vBar.getSize().x >= sc.getSize().x) {
+            return;
+        }
+    }
+    inLayout = true;
+    Rectangle contentRect = sc.content.getBounds();
+    if (!sc.alwaysShowScroll) {
+        bool hVisible = sc.needHScroll(contentRect, false);
+        bool vVisible = sc.needVScroll(contentRect, hVisible);
+        if (!hVisible && vVisible) hVisible = sc.needHScroll(contentRect, vVisible);
+        if (hBar !is null) hBar.setVisible(hVisible);
+        if (vBar !is null) vBar.setVisible(vVisible);
+    }
+    Rectangle hostRect = sc.getClientArea();
+    if (sc.expandHorizontal) {
+        contentRect.width = Math.max(sc.minWidth, hostRect.width);  
+    }
+    if (sc.expandVertical) {
+        contentRect.height = Math.max(sc.minHeight, hostRect.height);
+    }
+
+    if (hBar !is null) {
+        hBar.setMaximum (contentRect.width);
+        hBar.setThumb (Math.min (contentRect.width, hostRect.width));
+        int hPage = contentRect.width - hostRect.width;
+        int hSelection = hBar.getSelection ();
+        if (hSelection >= hPage) {
+            if (hPage <= 0) {
+                hSelection = 0;
+                hBar.setSelection(0);
+            }
+            contentRect.x = -hSelection;
+        }
+    }
+
+    if (vBar !is null) {
+        vBar.setMaximum (contentRect.height);
+        vBar.setThumb (Math.min (contentRect.height, hostRect.height));
+        int vPage = contentRect.height - hostRect.height;
+        int vSelection = vBar.getSelection ();
+        if (vSelection >= vPage) {
+            if (vPage <= 0) {
+                vSelection = 0;
+                vBar.setSelection(0);
+            }
+            contentRect.y = -vSelection;
+        }
+    }
+    
+    sc.content.setBounds (contentRect);
+    inLayout = false;
+}
+}