| /******************************************************************************* |
| * 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 |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * Composite example snippet: scroll a child control automatically |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| */ |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| 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 (700, 600); |
| final Color red = display.getSystemColor (SWT.COLOR_RED); |
| composite.addPaintListener (new PaintListener() { |
| @Override |
| public void paintControl (PaintEvent e) { |
| e.gc.setBackground (red); |
| e.gc.fillOval (5, 5, 690, 590); |
| } |
| }); |
| final ScrollBar hBar = shell.getHorizontalBar (); |
| hBar.addListener (SWT.Selection, new Listener () { |
| @Override |
| 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 () { |
| @Override |
| public void handleEvent (Event e) { |
| Point location = composite.getLocation (); |
| location.y = -vBar.getSelection (); |
| composite.setLocation (location); |
| } |
| }); |
| shell.addListener (SWT.Resize, new Listener () { |
| @Override |
| 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.setSize(600, 500); |
| shell.open (); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch ()) display.sleep (); |
| } |
| display.dispose (); |
| } |
| |
| } |