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annotate dwt/custom/BusyIndicator.d @ 128:07399639c0c8

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Added DWT extension to dwt.widgets.MessageBox
author Jacob Carlborg <doob@me.com>
date Sat, 17 Jan 2009 16:26:49 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.custom.BusyIndicator;
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17 import dwt.DWT;
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18 import dwt.graphics.Cursor;
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19 import dwt.widgets.Display;
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20 import dwt.widgets.Shell;
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22 import dwt.dwthelper.utils;
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24 /**
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25 * Support for showing a Busy Cursor during a long running process.
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26 *
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27 * @see <a href="http://www.eclipse.org/swt/snippets/#busyindicator">BusyIndicator snippets</a>
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28 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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29 */
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30 public class BusyIndicator {
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32 static int nextBusyId = 1;
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33 static const String BUSYID_NAME = "DWT BusyIndicator"; //$NON-NLS-1$
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34 static const String BUSY_CURSOR = "DWT BusyIndicator Cursor"; //$NON-NLS-1$
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36 /**
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37 * Runs the given <code>Runnable</code> while providing
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38 * busy feedback using this busy indicator.
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39 *
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40 * @param display the display on which the busy feedback should be
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41 * displayed. If the display is null, the Display for the current
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42 * thread will be used. If there is no Display for the current thread,
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43 * the runnable code will be executed and no busy feedback will be displayed.
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44 * @param runnable the runnable for which busy feedback is to be shown.
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45 * Must not be null.
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46 *
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47 * @exception IllegalArgumentException <ul>
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48 * <li>ERROR_NULL_ARGUMENT - if the runnable is null</li>
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49 * </ul>
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50 */
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52 public static void showWhile(Display display, Runnable runnable) {
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53 if (runnable is null)
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54 DWT.error(DWT.ERROR_NULL_ARGUMENT);
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55 if (display is null) {
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56 display = Display.getCurrent();
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57 if (display is null) {
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58 runnable.run();
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59 return;
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60 }
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61 }
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63 Integer busyId = new Integer(nextBusyId);
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64 nextBusyId++;
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65 Cursor cursor = display.getSystemCursor(DWT.CURSOR_WAIT);
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66 Shell[] shells = display.getShells();
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67 for (int i = 0; i < shells.length; i++) {
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68 Integer id = cast(Integer)shells[i].getData(BUSYID_NAME);
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69 if (id is null) {
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70 shells[i].setCursor(cursor);
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71 shells[i].setData(BUSYID_NAME, busyId);
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72 }
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73 }
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75 try {
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76 runnable.run();
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77 } finally {
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78 shells = display.getShells();
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79 for (int i = 0; i < shells.length; i++) {
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80 Integer id = cast(Integer)shells[i].getData(BUSYID_NAME);
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81 if ( id !is null && id == busyId) {
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82 shells[i].setCursor(null);
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83 shells[i].setData(BUSYID_NAME, null);
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84 }
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85 }
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86 }
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87 }
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88 }