Source Code : Scroll a child control automatically

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Scroll a child control automatically

/*
 * Composite example snippet: scroll a child control automatically
 *
 * 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.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.ScrollBar;
import org.eclipse.swt.widgets.Shell;

public class Snippet9 {

  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.H_SCROLL
        | SWT.V_SCROLL);
    final Composite composite = new Composite(shell, SWT.BORDER);
    composite.setSize(200, 400);
    final ScrollBar hBar = shell.getHorizontalBar();
    hBar.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event e) {
        Point location = composite.getLocation();
        location.x = -hBar.getSelection();
        composite.setLocation(location);
      }
    });
    final ScrollBar vBar = shell.getVerticalBar();
    vBar.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event e) {
        Point location = composite.getLocation();
        location.y = -vBar.getSelection();
        composite.setLocation(location);
      }
    });
    shell.addListener(SWT.Resize, new Listener() {
      public void handleEvent(Event e) {
        Point size = composite.getSize();
        Rectangle rect = shell.getClientArea();
        hBar.setMaximum(size.x);
        vBar.setMaximum(size.y);
        hBar.setThumb(Math.min(size.x, rect.width));
        vBar.setThumb(Math.min(size.y, rect.height));
        int hPage = size.x - rect.width;
        int vPage = size.y - rect.height;
        int hSelection = hBar.getSelection();
        int vSelection = vBar.getSelection();
        Point location = composite.getLocation();
        if (hSelection >= hPage) {
          if (hPage <= 0)
            hSelection = 0;
          location.x = -hSelection;
        }
        if (vSelection >= vPage) {
          if (vPage <= 0)
            vSelection = 0;
          location.y = -vSelection;
        }
        composite.setLocation(location);
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }

}


           
       

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