| /******************************************************************************* |
| * 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.Rectangle; |
| 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; |
| |
| /** |
| * Instances of this class are controls located on the top of a shell. They |
| * display a dark panel on this shell |
| */ |
| public class DarkPanel { |
| |
| /** The parent. */ |
| private final Shell parent; |
| |
| /** The Constant DARK_PANEL_KEY. */ |
| private static final String DARK_PANEL_KEY = "org.mihalis.opal.BluredPanel.DarkPanel"; |
| |
| /** The alpha. */ |
| private int alpha; |
| |
| /** 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 DarkPanel(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(DARK_PANEL_KEY) != null) { |
| throw new IllegalArgumentException("This shell has already an infinite panel attached on it !"); |
| } |
| shell.setData(DARK_PANEL_KEY, this); |
| this.alpha = 100; |
| } |
| |
| /** |
| * Show the dark 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.setAlpha(this.alpha); |
| |
| 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 |
| final Rectangle clientArea = ((Canvas) e.widget).getClientArea(); |
| final GC gc = e.gc; |
| gc.setBackground(this.panel.getDisplay().getSystemColor(SWT.COLOR_BLACK)); |
| gc.fillRectangle(clientArea); |
| } |
| |
| /** |
| * Hide the dark 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 alpha. |
| * |
| * @return the alpha value |
| */ |
| public int getAlpha() { |
| return this.alpha; |
| } |
| |
| /** |
| * Sets the alpha. |
| * |
| * @param alpha the alpha to set |
| */ |
| public void setAlpha(final int alpha) { |
| this.alpha = alpha; |
| } |
| |
| } |