Java tutorial
/******************************************************************************* * Copyright (c) 2009 Tasktop Technologies, Polarion Software 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: * Tasktop Technologies - initial API and implementation *******************************************************************************/ package org.eclipse.team.svn.ui.discovery.wizards; import java.net.URL; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.resource.ColorRegistry; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.window.ToolTip; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Link; import org.eclipse.team.svn.core.discovery.model.AbstractDiscoverySource; import org.eclipse.team.svn.core.discovery.model.Overview; import org.eclipse.team.svn.ui.SVNUIMessages; import org.eclipse.team.svn.ui.discovery.GradientToolTip; import org.eclipse.team.svn.ui.discovery.WorkbenchUtil; import org.eclipse.ui.browser.IWorkbenchBrowserSupport; /** * @author David Green * @author Igor Burilo */ class OverviewToolTip extends GradientToolTip { private static final String COLOR_BLACK = "black"; //$NON-NLS-1$ private final Overview overview; private final AbstractDiscoverySource source; private Color colorBlack; public OverviewToolTip(Control control, AbstractDiscoverySource source, Overview overview) { super(control, ToolTip.RECREATE, true); if (source == null) { throw new IllegalArgumentException(); } if (overview == null) { throw new IllegalArgumentException(); } this.source = source; this.overview = overview; setHideOnMouseDown(false); // required for links to work } @Override protected Composite createToolTipArea(Event event, final Composite parent) { if (colorBlack == null) { ColorRegistry colorRegistry = JFaceResources.getColorRegistry(); if (!colorRegistry.hasValueFor(COLOR_BLACK)) { colorRegistry.put(COLOR_BLACK, new RGB(0, 0, 0)); } colorBlack = colorRegistry.get(COLOR_BLACK); } GridLayoutFactory.fillDefaults().applyTo(parent); Composite container = new Composite(parent, SWT.NULL); container.setBackground(null); Image image = null; if (overview.getScreenshot() != null) { image = computeImage(source, overview.getScreenshot()); if (image != null) { final Image fimage = image; container.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent e) { fimage.dispose(); } }); } } final boolean hasLearnMoreLink = overview.getUrl() != null && overview.getUrl().length() > 0; final int borderWidth = 1; final int fixedImageHeight = 240; final int fixedImageWidth = 320; final int heightHint = fixedImageHeight + (borderWidth * 2); final int widthHint = fixedImageWidth; final int containerWidthHintWithImage = 650; final int containerWidthHintWithoutImage = 500; GridDataFactory.fillDefaults().grab(true, true) .hint(image == null ? containerWidthHintWithoutImage : containerWidthHintWithImage, SWT.DEFAULT) .applyTo(container); GridLayoutFactory.fillDefaults().numColumns(2).margins(5, 5).spacing(3, 0).applyTo(container); String summary = overview.getSummary(); Composite summaryContainer = new Composite(container, SWT.NULL); summaryContainer.setBackground(null); GridLayoutFactory.fillDefaults().applyTo(summaryContainer); GridDataFactory gridDataFactory = GridDataFactory.fillDefaults().grab(true, true) .span(image == null ? 2 : 1, 1); if (image != null) { gridDataFactory.hint(widthHint, heightHint); } gridDataFactory.applyTo(summaryContainer); Label summaryLabel = new Label(summaryContainer, SWT.WRAP); summaryLabel.setText(summary); summaryLabel.setBackground(null); GridDataFactory.fillDefaults().grab(true, true).align(SWT.BEGINNING, SWT.BEGINNING).applyTo(summaryLabel); if (image != null) { final Composite imageContainer = new Composite(container, SWT.BORDER); GridLayoutFactory.fillDefaults().applyTo(imageContainer); GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.BEGINNING) .hint(widthHint + (borderWidth * 2), heightHint).applyTo(imageContainer); Label imageLabel = new Label(imageContainer, SWT.NULL); GridDataFactory.fillDefaults().hint(widthHint, fixedImageHeight).indent(borderWidth, borderWidth) .applyTo(imageLabel); imageLabel.setImage(image); imageLabel.setBackground(null); imageLabel.setSize(widthHint, fixedImageHeight); // creates a border imageContainer.setBackground(colorBlack); } if (hasLearnMoreLink) { Link link = new Link(summaryContainer, SWT.NULL); GridDataFactory.fillDefaults().grab(false, false).align(SWT.BEGINNING, SWT.CENTER).applyTo(link); link.setText(SVNUIMessages.ConnectorDescriptorToolTip_detailsLink); link.setBackground(null); link.setToolTipText(SVNUIMessages.format(SVNUIMessages.ConnectorDescriptorToolTip_detailsLink_tooltip, overview.getUrl())); link.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { WorkbenchUtil.openUrl(overview.getUrl(), IWorkbenchBrowserSupport.AS_EXTERNAL); } public void widgetDefaultSelected(SelectionEvent e) { widgetSelected(e); } }); } if (image == null) { // prevent overviews with no image from providing unlimited text. Point optimalSize = summaryContainer.computeSize(SWT.DEFAULT, SWT.DEFAULT, true); if (optimalSize.y > (heightHint + 10)) { ((GridData) summaryContainer.getLayoutData()).heightHint = heightHint; container.layout(true); } } // hack: cause the tooltip to gain focus so that we can capture the escape key // this must be done async since the tooltip is not yet visible. Display.getCurrent().asyncExec(new Runnable() { public void run() { if (!parent.isDisposed()) { parent.setFocus(); } } }); return container; } private Image computeImage(AbstractDiscoverySource discoverySource, String imagePath) { URL resource = discoverySource.getResource(imagePath); if (resource != null) { ImageDescriptor descriptor = ImageDescriptor.createFromURL(resource); Image image = descriptor.createImage(); return image; } return null; } }