package org.eclipse.swt.custom; | |
/* | |
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved. | |
* This file is made available under the terms of the Common Public License v1.0 | |
* which accompanies this distribution, and is available at | |
* http://www.eclipse.org/legal/cpl-v10.html | |
*/ | |
import org.eclipse.swt.*; | |
import org.eclipse.swt.events.*; | |
import org.eclipse.swt.graphics.*; | |
import org.eclipse.swt.widgets.*; | |
/** | |
* Support for showing a Busy Cursor during a long running process. | |
*/ | |
public class BusyIndicator { | |
static int nextBusyId = 1; | |
static final String BUSYID_NAME = "SWT BusyIndicator"; | |
/** | |
* 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> | |
* | |
* @see #showWhile | |
*/ | |
public static void showWhile(Display display, Runnable runnable) { | |
if (runnable == null) | |
SWT.error(SWT.ERROR_NULL_ARGUMENT); | |
if (display == null) { | |
display = Display.getCurrent(); | |
if (display == null) { | |
runnable.run(); | |
return; | |
} | |
} | |
Integer busyId = new Integer(nextBusyId); | |
nextBusyId++; | |
Cursor cursor = new Cursor(display, SWT.CURSOR_WAIT); | |
Shell[] shells = display.getShells(); | |
for (int i = 0; i < shells.length; i++) { | |
Integer id = (Integer)shells[i].getData(BUSYID_NAME); | |
if (id == 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 = (Integer)shells[i].getData(BUSYID_NAME); | |
if (id == busyId) { | |
shells[i].setCursor(null); | |
shells[i].setData(BUSYID_NAME, null); | |
} | |
} | |
if (cursor != null && !cursor.isDisposed()) { | |
cursor.dispose(); | |
} | |
} | |
} | |
} |