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annotate dwt/custom/BusyIndicator.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | f565d3a95c0a |
rev | line source |
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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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11 * Port to the D Programming language: |
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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 } |