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annotate dwt/custom/BusyIndicator.d @ 13:f565d3a95c0a

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Ported dwt.internal
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Fri, 22 Aug 2008 16:46:34 +0200
parents 380af2bdd8e5
children 6337764516f1
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 *
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f565d3a95c0a Ported dwt.internal
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11 * Port to the D programming language:
0
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.custom.BusyIndicator;
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15
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16 import dwt.DWT;
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17 import dwt.graphics.Cursor;
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18 import dwt.widgets.Display;
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19 import dwt.widgets.Shell;
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20
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21 import dwt.dwthelper.Runnable;
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22 import dwt.dwthelper.string;
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23 import dwt.dwthelper.utils : Integer;
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24
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25 /**
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26 * Support for showing a Busy Cursor during a long running process.
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27 */
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28 public class BusyIndicator {
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29
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30 static int nextBusyId = 1;
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31 static final String BUSYID_NAME = "DWT BusyIndicator"; //$NON-NLS-1$
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32 static final String BUSY_CURSOR = "DWT BusyIndicator Cursor"; //$NON-NLS-1$
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33
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34 /**
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35 * Runs the given <code>Runnable</code> while providing
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36 * busy feedback using this busy indicator.
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37 *
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38 * @param display the display on which the busy feedback should be
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39 * displayed. If the display is null, the Display for the current
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40 * thread will be used. If there is no Display for the current thread,
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41 * the runnable code will be executed and no busy feedback will be displayed.
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42 * @param runnable the runnable for which busy feedback is to be shown.
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43 * Must not be null.
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44 *
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45 * @exception IllegalArgumentException <ul>
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46 * <li>ERROR_NULL_ARGUMENT - if the runnable is null</li>
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47 * </ul>
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48 */
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49
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50 public static void showWhile (Display display, Runnable runnable) {
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51 if (runnable is null)
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52 DWT.error(DWT.ERROR_NULL_ARGUMENT);
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53 if (display is null) {
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54 display = Display.getCurrent();
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55 if (display is null) {
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56 runnable.run();
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57 return;
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58 }
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59 }
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60
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61 Integer busyId = new Integer(nextBusyId);
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62 nextBusyId++;
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63 Cursor cursor = display.getSystemCursor(DWT.CURSOR_WAIT);
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64 Shell[] shells = display.getShells();
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65 for (int i = 0; i < shells.length; i++) {
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66 Integer id = cast(Integer) shells[i].getData(BUSYID_NAME);
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67 if (id is null) {
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68 shells[i].setCursor(cursor);
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69 shells[i].setData(BUSYID_NAME, busyId);
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70 }
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71 }
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72
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73 try {
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74 runnable.run();
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75 }
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76 finally {
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77 shells = display.getShells();
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78 for (int i = 0; i < shells.length; i++) {
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79 Integer id = cast(Integer) shells[i].getData(BUSYID_NAME);
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80 if (id is busyId) {
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81 shells[i].setCursor(null);
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82 shells[i].setData(BUSYID_NAME, null);
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83 }
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84 }
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85 }
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86 }
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87 }