BusyCursorDisplay.java Source code

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Here is the source code for BusyCursorDisplay.java

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/*******************************************************************************
 * Copyright (c) 2000, 2004 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
 *******************************************************************************/

/*
 * BusyIndicator example snippet: display busy cursor during long running task
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class BusyCursorDisplay {

    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new GridLayout());
        final Text text = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL);
        text.setLayoutData(new GridData(GridData.FILL_BOTH));
        final int[] nextId = new int[1];
        Button b = new Button(shell, SWT.PUSH);
        b.setText("invoke long running job");
        b.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                Runnable longJob = new Runnable() {
                    boolean done = false;

                    int id;

                    public void run() {
                        Thread thread = new Thread(new Runnable() {
                            public void run() {
                                id = nextId[0]++;
                                display.syncExec(new Runnable() {
                                    public void run() {
                                        if (text.isDisposed())
                                            return;
                                        text.append("\nStart long running task " + id);
                                    }
                                });
                                for (int i = 0; i < 100000; i++) {
                                    if (display.isDisposed())
                                        return;
                                    System.out.println("do task that takes a long time in a separate thread " + id);
                                }
                                if (display.isDisposed())
                                    return;
                                display.syncExec(new Runnable() {
                                    public void run() {
                                        if (text.isDisposed())
                                            return;
                                        text.append("\nCompleted long running task " + id);
                                    }
                                });
                                done = true;
                                display.wake();
                            }
                        });
                        thread.start();
                        while (!done && !shell.isDisposed()) {
                            if (!display.readAndDispatch())
                                display.sleep();
                        }
                    }
                };
                BusyIndicator.showWhile(display, longJob);
            }
        });
        shell.setSize(250, 150);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}