| /******************************************************************************* |
| * Copyright (c) 2006, 2009 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 |
| * Stefan Mucke - fix for Bug 156456 |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.forms.widgets; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| |
| import org.eclipse.core.runtime.FileLocator; |
| import org.eclipse.core.runtime.Path; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.jface.resource.ImageDescriptor; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.events.DisposeEvent; |
| import org.eclipse.swt.events.DisposeListener; |
| 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.graphics.Point; |
| import org.eclipse.swt.graphics.Rectangle; |
| import org.eclipse.swt.widgets.Canvas; |
| import org.eclipse.swt.widgets.Composite; |
| import org.eclipse.swt.widgets.Display; |
| import org.osgi.framework.Bundle; |
| |
| public final class BusyIndicator extends Canvas { |
| |
| private static final int MARGIN = 0; |
| private static final int IMAGE_COUNT = 8; |
| private static final int MILLISECONDS_OF_DELAY = 180; |
| private Image[] imageCache; |
| private Image image; |
| |
| private Display dpy; |
| private Runnable timer; |
| private boolean busy; |
| private int imageIndex; |
| |
| /** |
| * BusyWidget constructor comment. |
| * |
| * @param parent |
| * org.eclipse.swt.widgets.Composite |
| * @param style |
| * int |
| */ |
| public BusyIndicator(Composite parent, int style) { |
| super(parent, style | SWT.DOUBLE_BUFFERED); |
| |
| dpy = getDisplay(); |
| timer = new Runnable() { |
| public void run () { |
| if (isDisposed()) return; |
| redraw(); |
| if (!BusyIndicator.this.busy) return; |
| update(); |
| if (isDisposed()) return; |
| imageIndex = (imageIndex + 1) % IMAGE_COUNT; |
| dpy.timerExec(MILLISECONDS_OF_DELAY, this); |
| } |
| }; |
| |
| addPaintListener(new PaintListener() { |
| public void paintControl(PaintEvent event) { |
| onPaint(event); |
| } |
| }); |
| |
| addDisposeListener(new DisposeListener() { |
| public void widgetDisposed(DisposeEvent e) { |
| clearImages(); |
| } |
| }); |
| } |
| |
| public Point computeSize(int wHint, int hHint, boolean changed) { |
| // checkWidget(); |
| Point size = new Point(0, 0); |
| if (image != null) { |
| Rectangle ibounds = image.getBounds(); |
| size.x = ibounds.width; |
| size.y = ibounds.height; |
| } |
| if (isBusy()) { |
| Rectangle bounds = getImage(0).getBounds(); |
| size.x = Math.max(size.x, bounds.width); |
| size.y = Math.max(size.y, bounds.height); |
| } |
| size.x += MARGIN + MARGIN; |
| size.y += MARGIN + MARGIN; |
| return size; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.swt.widgets.Control#forceFocus() |
| */ |
| public boolean forceFocus() { |
| return false; |
| } |
| |
| /** |
| * Return the image or <code>null</code>. |
| */ |
| public Image getImage() { |
| return image; |
| } |
| |
| /** |
| * Returns true if it is currently busy. |
| * |
| * @return boolean |
| */ |
| public boolean isBusy() { |
| return busy; |
| } |
| |
| /* |
| * Process the paint event |
| */ |
| void onPaint(PaintEvent event) { |
| Rectangle rect = getClientArea(); |
| if (rect.width == 0 || rect.height == 0) |
| return; |
| |
| Image activeImage; |
| if (isBusy()) { |
| activeImage = getImage(imageIndex); |
| } else { |
| clearImages(); |
| activeImage = image; |
| } |
| |
| if (activeImage != null) { |
| GC gc = event.gc; |
| Rectangle ibounds = activeImage.getBounds(); |
| gc.drawImage(activeImage, rect.width / 2 - ibounds.width / 2, |
| rect.height / 2 - ibounds.height / 2); |
| } |
| } |
| |
| /** |
| * Sets the indicators busy count up (true) or down (false) one. |
| * |
| * @param busy |
| * boolean |
| */ |
| public synchronized void setBusy(boolean busy) { |
| if (this.busy == busy) return; |
| this.busy = busy; |
| imageIndex = 0; |
| dpy.asyncExec(timer); |
| } |
| |
| /** |
| * Set the image. The value <code>null</code> clears it. |
| */ |
| public void setImage(Image image) { |
| if (image != this.image && !isDisposed()) { |
| this.image = image; |
| redraw(); |
| } |
| } |
| |
| private ImageDescriptor createImageDescriptor(String relativePath) { |
| Bundle bundle = Platform.getBundle("org.eclipse.ui.forms"); //$NON-NLS-1$ |
| URL url = FileLocator.find(bundle, new Path(relativePath),null); |
| if (url == null) return null; |
| try { |
| url = FileLocator.resolve(url); |
| return ImageDescriptor.createFromURL(url); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| private Image getImage(int index) { |
| if (imageCache == null) { |
| imageCache = new Image[IMAGE_COUNT]; |
| } |
| if (imageCache[index] == null){ |
| ImageDescriptor descriptor = createImageDescriptor("$nl$/icons/progress/ani/" + (index + 1) + ".png"); //$NON-NLS-1$ //$NON-NLS-2$ |
| imageCache[index] = descriptor.createImage(); |
| } |
| return imageCache[index]; |
| } |
| |
| private void clearImages() { |
| if (imageCache != null) { |
| for (int index = 0; index < IMAGE_COUNT; index++) { |
| if (imageCache[index] != null && !imageCache[index].isDisposed()) { |
| imageCache[index].dispose(); |
| imageCache[index] = null; |
| } |
| } |
| } |
| } |
| |
| } |