--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/custom/BusyIndicator.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * 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
+ *     
+ * Port to the D Programming language:
+ *     Jacob Carlborg <jacob.carlborg@gmail.com>
+ *******************************************************************************/
+module dwt.custom.BusyIndicator;
+
+import dwt.DWT;
+import dwt.graphics.Cursor;
+import dwt.widgets.Display;
+import dwt.widgets.Shell;
+
+import dwt.dwthelper.Runnable;
+import dwt.dwthelper.string;
+import dwt.dwthelper.utils : Integer;
+
+/**
+ * Support for showing a Busy Cursor during a long running process.
+ */
+public class BusyIndicator {
+
+    static int nextBusyId = 1;
+    static final String BUSYID_NAME = "DWT BusyIndicator"; //$NON-NLS-1$
+    static final String BUSY_CURSOR = "DWT BusyIndicator Cursor"; //$NON-NLS-1$
+
+    /**
+     * Runs the given <code>Runnable</code> while providing
+     * busy feedback using this busy indicator.
+     * 
+     * @param display the display on which the busy feedback should be
+     *        displayed.  If the display is null, the Display for the current
+     *        thread will be used.  If there is no Display for the current thread,
+     *        the runnable code will be executed and no busy feedback will be displayed.
+     * @param runnable the runnable for which busy feedback is to be shown.
+     *        Must not be null.
+     * 
+     * @exception IllegalArgumentException <ul>
+     *    <li>ERROR_NULL_ARGUMENT - if the runnable is null</li>
+     * </ul>
+     */
+
+    public static void showWhile (Display display, Runnable runnable) {
+        if (runnable is null)
+            DWT.error(DWT.ERROR_NULL_ARGUMENT);
+        if (display is null) {
+            display = Display.getCurrent();
+            if (display is null) {
+                runnable.run();
+                return;
+            }
+        }
+
+        Integer busyId = new Integer(nextBusyId);
+        nextBusyId++;
+        Cursor cursor = display.getSystemCursor(DWT.CURSOR_WAIT);
+        Shell[] shells = display.getShells();
+        for (int i = 0; i < shells.length; i++) {
+            Integer id = cast(Integer) shells[i].getData(BUSYID_NAME);
+            if (id is null) {
+                shells[i].setCursor(cursor);
+                shells[i].setData(BUSYID_NAME, busyId);
+            }
+        }
+
+        try {
+            runnable.run();
+        }
+        finally {
+            shells = display.getShells();
+            for (int i = 0; i < shells.length; i++) {
+                Integer id = cast(Integer) shells[i].getData(BUSYID_NAME);
+                if (id is busyId) {
+                    shells[i].setCursor(null);
+                    shells[i].setData(BUSYID_NAME, null);
+                }
+            }
+        }
+    }
+}