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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