| /******************************************************************************* |
| * Copyright (c) 2011 Laurent CARON |
| * 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: |
| * Laurent CARON (laurent.caron at gmail dot com) - initial API and implementation |
| *******************************************************************************/ |
| package org.mihalis.opal.panels; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.SWTException; |
| import org.eclipse.swt.events.PaintEvent; |
| import org.eclipse.swt.events.PaintListener; |
| import org.eclipse.swt.graphics.GC; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.layout.FillLayout; |
| import org.eclipse.swt.widgets.Canvas; |
| import org.eclipse.swt.widgets.Event; |
| import org.eclipse.swt.widgets.Listener; |
| import org.eclipse.swt.widgets.Shell; |
| import org.mihalis.opal.utils.SWTGraphicUtil; |
| |
| /** |
| * Instances of this class are controls located on the top of a shell. They |
| * display a blurred version of the content of the shell |
| */ |
| public class BlurredPanel { |
| |
| /** The parent. */ |
| private final Shell parent; |
| |
| /** The Constant BLURED_PANEL_KEY. */ |
| private static final String BLURED_PANEL_KEY = "org.mihalis.opal.Panels.DarkPanel"; |
| |
| /** The radius. */ |
| private int radius; |
| |
| /** The panel. */ |
| private Shell panel; |
| |
| /** The canvas. */ |
| private Canvas canvas; |
| |
| /** |
| * Constructs a new instance of this class given its parent. |
| * |
| * @param shell a shell that will be the parent of the new instance (cannot |
| * be null) |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the parent has been |
| * disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the |
| * thread that created the parent</li> |
| * </ul> |
| */ |
| public BlurredPanel(final Shell shell) { |
| if (shell == null) { |
| SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| } |
| |
| if (shell.isDisposed()) { |
| SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| } |
| |
| this.parent = shell; |
| if (shell.getData(BLURED_PANEL_KEY) != null) { |
| throw new IllegalArgumentException("This shell has already an infinite panel attached on it !"); |
| } |
| shell.setData(BLURED_PANEL_KEY, this); |
| this.radius = 2; |
| } |
| |
| /** |
| * Show the blurred panel. |
| */ |
| public void show() { |
| if (this.parent.isDisposed()) { |
| SWT.error(SWT.ERROR_WIDGET_DISPOSED); |
| } |
| |
| this.panel = new Shell(this.parent, SWT.APPLICATION_MODAL | SWT.NO_TRIM); |
| this.panel.setLayout(new FillLayout()); |
| |
| this.panel.addListener(SWT.KeyUp, new Listener() { |
| |
| @Override |
| public void handleEvent(final Event event) { |
| event.doit = false; |
| } |
| }); |
| |
| this.canvas = new Canvas(this.panel, SWT.NO_BACKGROUND | SWT.DOUBLE_BUFFERED); |
| this.canvas.addPaintListener(new PaintListener() { |
| |
| @Override |
| public void paintControl(final PaintEvent e) { |
| paintCanvas(e); |
| } |
| }); |
| |
| this.panel.setBounds(this.panel.getDisplay().map(this.parent, null, this.parent.getClientArea())); |
| this.panel.open(); |
| |
| } |
| |
| /** |
| * Paint the canvas that holds the panel. |
| * |
| * @param e {@link PaintEvent} |
| */ |
| private void paintCanvas(final PaintEvent e) { |
| // Paint the panel |
| e.gc.drawImage(createBlurredImage(), 0, 0); |
| } |
| |
| /** |
| * Creates the blurred image. |
| * |
| * @return the image |
| */ |
| private Image createBlurredImage() { |
| final GC gc = new GC(this.parent); |
| final Image image = new Image(this.parent.getDisplay(), this.parent.getSize().x, this.parent.getSize().y); |
| gc.copyArea(image, 0, 0); |
| gc.dispose(); |
| |
| return new Image(this.parent.getDisplay(), SWTGraphicUtil.blur(image.getImageData(), this.radius)); |
| |
| } |
| |
| /** |
| * Hide the panel. |
| */ |
| public void hide() { |
| if (this.parent.isDisposed()) { |
| SWT.error(SWT.ERROR_WIDGET_DISPOSED); |
| } |
| |
| if (this.panel == null || this.panel.isDisposed()) { |
| return; |
| } |
| |
| this.panel.dispose(); |
| } |
| |
| /** |
| * Gets the radius. |
| * |
| * @return the radius of the blur effect |
| */ |
| public int getRadius() { |
| return this.radius; |
| } |
| |
| /** |
| * Sets the radius. |
| * |
| * @param radius the radius to set |
| */ |
| public void setRadius(final int radius) { |
| this.radius = radius; |
| } |
| |
| } |