Java tutorial
/******************************************************************************* * 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 *******************************************************************************/ package org.eclipse.swt.custom; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; /** * 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"; //$NON-NLS-1$ // static final String BUSY_CURSOR = "SWT 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 == 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 = display.getSystemCursor(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); // } // } // } } }