Java tutorial
/* ****************************************************************************** * Copyright (c) 2006-2012 XMind Ltd. and others. * * This file is a part of XMind 3. XMind releases 3 and * above are dual-licensed under the Eclipse Public License (EPL), * which is available at http://www.eclipse.org/legal/epl-v10.html * and the GNU Lesser General Public License (LGPL), * which is available at http://www.gnu.org/licenses/lgpl.html * See http://www.xmind.net/license.html for details. * * Contributors: * XMind Ltd. - initial API and implementation *******************************************************************************/ package org.xmind.ui.internal.browser; import java.io.PrintWriter; import java.io.StringWriter; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.BusyIndicator; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Link; import org.eclipse.swt.widgets.Text; import org.xmind.ui.browser.IBrowserViewerContainer; public class BrowserErrorText { private String url; private FallbackScrolledComposite scomp; private Label title; private Label exTitle; private Label text; private Label sep; protected Link link; private BrowserViewer viewer; private Button button; private Text exception; private boolean expanded; private Throwable ex; class ReflowScrolledComposite extends FallbackScrolledComposite { public ReflowScrolledComposite(Composite parent, int style) { super(parent, style); } @Override public void reflow(boolean flushCache) { updateWidth(this); super.reflow(flushCache); } } public BrowserErrorText(Composite parent, BrowserViewer viewer, Throwable ex) { this.viewer = viewer; this.ex = ex; Color bg = parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND); scomp = new ReflowScrolledComposite(parent, SWT.V_SCROLL | SWT.H_SCROLL); Composite client = new Composite(scomp, SWT.NULL); fillContent(client, bg); scomp.setContent(client); scomp.setBackground(bg); } private void fillContent(Composite parent, Color bg) { GridLayout layout = new GridLayout(); layout.verticalSpacing = 10; parent.setLayout(layout); title = new Label(parent, SWT.WRAP); title.setText(BrowserMessages.BrowserText_EmbeddedBrowserUnavailableInfo); title.setFont(JFaceResources.getHeaderFont()); title.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); title.setBackground(bg); link = new Link(parent, SWT.WRAP); link.setText(""); //$NON-NLS-1$ link.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); link.setToolTipText("<a href=\"open\">" + BrowserMessages.BrowserText_OpenFileLinkToolTip + "</a>"); //$NON-NLS-1$ //$NON-NLS-2$ link.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { BusyIndicator.showWhile(link.getDisplay(), new Runnable() { public void run() { doOpenExternal(); } }); } }); link.setBackground(bg); sep = new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL); sep.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); exTitle = new Label(parent, SWT.NULL); exTitle.setBackground(bg); exTitle.setFont(JFaceResources.getBannerFont()); exTitle.setText(BrowserMessages.BrowserText_ProblemDetailsTitle); exTitle.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); text = new Label(parent, SWT.WRAP); text.setText(BrowserMessages.BrowserText_ProblemDetails); text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); text.setBackground(bg); button = new Button(parent, SWT.PUSH); updateButtonText(); button.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { toggleException(); } }); exception = new Text(parent, SWT.MULTI); loadExceptionText(); GridData gd = new GridData(GridData.FILL_BOTH); gd.exclude = true; exception.setLayoutData(gd); } private void loadExceptionText() { StringWriter swriter = new StringWriter(); PrintWriter writer = new PrintWriter(swriter); writer.println(ex.getMessage()); ex.printStackTrace(writer); writer.close(); exception.setText(swriter.toString()); } protected void toggleException() { expanded = !expanded; updateButtonText(); GridData gd = (GridData) exception.getLayoutData(); gd.exclude = !expanded; exception.setVisible(expanded); refresh(); } private void updateButtonText() { if (expanded) button.setText(BrowserMessages.BrowserText_Details + "<<"); //$NON-NLS-1$ else button.setText(BrowserMessages.BrowserText_Details + ">>"); //$NON-NLS-1$ } protected void updateWidth(Composite parent) { Rectangle area = parent.getClientArea(); updateWidth(title, area.width); updateWidth(text, area.width); updateWidth(sep, area.width); updateWidth(link, area.width); updateWidth(exTitle, area.width); updateWidth(exception, area.width); } private void updateWidth(Control c, int width) { GridData gd = (GridData) c.getLayoutData(); if (gd != null) gd.widthHint = width - 10; } protected void doOpenExternal() { IBrowserViewerContainer container = viewer.getContainer(); if (container != null) container.openInExternalBrowser(url); } public Control getControl() { return scomp; } public boolean setUrl(String url) { this.url = url; return true; } public void setFocus() { link.setFocus(); } public String getUrl() { return url; } public void refresh() { scomp.reflow(true); } }