Source Code : Create two ScrolledComposites that scroll in tandem

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Create two ScrolledComposites that scroll in tandem

/*
 * Create two ScrolledComposites that scroll in tandem.
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ScrollBar;
import org.eclipse.swt.widgets.Shell;

public class Snippet167 {

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    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 = new SelectionAdapter() {
      public void widgetSelected(SelectionEvent 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 = new SelectionAdapter() {
      public void widgetSelected(SelectionEvent 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();
  }
}

           
       

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