org.eclipse.swt.snippets.Snippet167.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet167.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 502845
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Create two ScrolledComposites that scroll in tandem.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */

import static org.eclipse.swt.events.SelectionListener.*;

import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet167 {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 167");
        shell.setLayout(new FillLayout());

        final ScrolledComposite sc1 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
        Button button1 = new Button(sc1, SWT.PUSH);
        button1.setText("Button 1");
        button1.setSize(400, 300);
        sc1.setContent(button1);

        final ScrolledComposite sc2 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
        Button button2 = new Button(sc2, SWT.PUSH);
        button2.setText("Button 2");
        button2.setSize(300, 400);
        sc2.setContent(button2);

        final ScrollBar vBar1 = sc1.getVerticalBar();
        final ScrollBar vBar2 = sc2.getVerticalBar();
        final ScrollBar hBar1 = sc1.getHorizontalBar();
        final ScrollBar hBar2 = sc2.getHorizontalBar();
        SelectionListener listener1 = widgetSelectedAdapter(e -> {
            int x = hBar1.getSelection() * (hBar2.getMaximum() - hBar2.getThumb())
                    / Math.max(1, hBar1.getMaximum() - hBar1.getThumb());
            int y = vBar1.getSelection() * (vBar2.getMaximum() - vBar2.getThumb())
                    / Math.max(1, vBar1.getMaximum() - vBar1.getThumb());
            sc2.setOrigin(x, y);
        });
        SelectionListener listener2 = widgetSelectedAdapter(e -> {
            int x = hBar2.getSelection() * (hBar1.getMaximum() - hBar1.getThumb())
                    / Math.max(1, hBar2.getMaximum() - hBar2.getThumb());
            int y = vBar2.getSelection() * (vBar1.getMaximum() - vBar1.getThumb())
                    / Math.max(1, vBar2.getMaximum() - vBar2.getThumb());
            sc1.setOrigin(x, y);
        });
        vBar1.addSelectionListener(listener1);
        hBar1.addSelectionListener(listener1);
        vBar2.addSelectionListener(listener2);
        hBar2.addSelectionListener(listener2);

        shell.setSize(400, 300);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}