--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/snippets/canvas/Snippet48.d	Tue May 20 12:10:54 2008 +0900
@@ -0,0 +1,129 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 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
+ * D Port:
+ *     Bill Baxter <wbaxter> at gmail com
+ *******************************************************************************/
+module snippets.canvas.Snippet48;
+ 
+/*
+ * Canvas example snippet: scroll an image (flicker free, no double buffering)
+ *
+ * For a list of all SWT example snippets see
+ * http://www.eclipse.org/swt/snippets/
+ */
+import dwt.DWT;
+import dwt.graphics.GC;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+import dwt.graphics.Color;
+import dwt.graphics.Image;
+import dwt.layout.FillLayout;
+import dwt.widgets.Display;
+import dwt.widgets.Shell;
+import dwt.widgets.Event;
+import dwt.widgets.Listener;
+import dwt.widgets.FileDialog;
+import dwt.widgets.Canvas;
+import dwt.widgets.ScrollBar;
+import dwt.layout.FillLayout;
+
+import dwt.dwthelper.utils;
+
+void main () {
+	Display display = new Display ();
+	Shell shell = new Shell (display);
+	shell.setLayout(new FillLayout());
+	Image originalImage = null;
+	FileDialog dialog = new FileDialog (shell, DWT.OPEN);
+	dialog.setText ("Open an image file or cancel");
+	String string = dialog.open ();
+	if (string !is null) {
+		originalImage = new Image (display, string);
+	}
+	if (originalImage is null) {
+		int width = 150, height = 200;
+		originalImage = new Image (display, width, height);
+		GC gc = new GC (originalImage);
+		gc.fillRectangle (0, 0, width, height);
+		gc.drawLine (0, 0, width, height);
+		gc.drawLine (0, height, width, 0);
+		gc.drawText ("Default Image", 10, 10);
+		gc.dispose ();
+	}
+	final Image image = originalImage;
+	final Point origin = new Point (0, 0);
+	final Canvas canvas = new Canvas (shell, DWT.NO_BACKGROUND |
+			DWT.NO_REDRAW_RESIZE | DWT.V_SCROLL | DWT.H_SCROLL);
+	final ScrollBar hBar = canvas.getHorizontalBar ();
+    void onHBarSelection (Event e) {
+        int hSelection = hBar.getSelection ();
+        int destX = -hSelection - origin.x;
+        Rectangle rect = image.getBounds ();
+        canvas.scroll (destX, 0, 0, 0, rect.width, rect.height, false);
+        origin.x = -hSelection;
+    }
+	final ScrollBar vBar = canvas.getVerticalBar ();
+    void onVBarSelection(Event e) {
+        int vSelection = vBar.getSelection ();
+        int destY = -vSelection - origin.y;
+        Rectangle rect = image.getBounds ();
+        canvas.scroll (0, destY, 0, 0, rect.width, rect.height, false);
+        origin.y = -vSelection;
+    }
+    void onResize(Event e) {
+        Rectangle rect = image.getBounds ();
+        Rectangle client = canvas.getClientArea ();
+        hBar.setMaximum (rect.width);
+        vBar.setMaximum (rect.height);
+        hBar.setThumb (Math.min (rect.width, client.width));
+        vBar.setThumb (Math.min (rect.height, client.height));
+        int hPage = rect.width - client.width;
+        int vPage = rect.height - client.height;
+        int hSelection = hBar.getSelection ();
+        int vSelection = vBar.getSelection ();
+        if (hSelection >= hPage) {
+            if (hPage <= 0) hSelection = 0;
+            origin.x = -hSelection;
+        }
+        if (vSelection >= vPage) {
+            if (vPage <= 0) vSelection = 0;
+            origin.y = -vSelection;
+        }
+        canvas.redraw ();
+    }
+    void onPaint (Event e) {
+        GC gc = e.gc;
+        gc.drawImage (image, origin.x, origin.y);
+        Rectangle rect = image.getBounds ();
+        Rectangle client = canvas.getClientArea ();
+        int marginWidth = client.width - rect.width;
+        if (marginWidth > 0) {
+            gc.fillRectangle (rect.width, 0, marginWidth, client.height);
+        }
+        int marginHeight = client.height - rect.height;
+        if (marginHeight > 0) {
+            gc.fillRectangle (0, rect.height, client.width, marginHeight);
+        }
+    }
+
+	hBar.addListener (DWT.Selection, dgListener(&onHBarSelection));
+	vBar.addListener (DWT.Selection, dgListener(&onVBarSelection));
+	canvas.addListener (DWT.Resize,  dgListener(&onResize));
+	canvas.addListener (DWT.Paint, dgListener(&onPaint));
+
+	shell.setSize (200, 150);
+	shell.open ();
+	while (!shell.isDisposed ()) {
+		if (!display.readAndDispatch ()) display.sleep ();
+	}
+	originalImage.dispose();
+	display.dispose ();
+}
+