Java tutorial
/******************************************************************************* * Copyright (c) 2003, 2005 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 *******************************************************************************/ package org.eclipse.wst.common.frameworks.internal.ui; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.PrintStream; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.SWTError; import org.eclipse.swt.SWTException; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; 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.Shell; import org.eclipse.swt.widgets.Text; /** * Added a Details button to the MessageDialog to show the exception stack trace. * * Borrowed from an eclipse InternalErrorDialog */ public class ErrorDialog extends MessageDialog { protected static final String[] LABELS_OK = { IDialogConstants.OK_LABEL }; protected static final String[] LABELS_OK_CANCEL = { IDialogConstants.OK_LABEL, IDialogConstants.CANCEL_LABEL }; protected static final String[] LABELS_OK_DETAILS = { IDialogConstants.OK_LABEL, IDialogConstants.SHOW_DETAILS_LABEL }; protected static final String[] LABELS_OK_CANCEL_DETAILS = { IDialogConstants.OK_LABEL, IDialogConstants.CANCEL_LABEL, IDialogConstants.SHOW_DETAILS_LABEL }; private Throwable detail; private int detailButtonID = -1; private Text text; private String message2; //Workaround. SWT does not seem to set the default button if //there is not control with focus. Bug: 14668 private int defaultButtonIndex = 0; /** * Size of the text in lines. */ private static final int TEXT_LINE_COUNT = 15; public ErrorDialog(Shell parentShell, String dialogTitle, Image dialogTitleImage, String dialogMessage, Throwable detail, int dialogImageType, String[] dialogButtonLabels, int defaultIndex) { super(parentShell, dialogTitle, dialogTitleImage, dialogMessage, dialogImageType, dialogButtonLabels, defaultIndex); defaultButtonIndex = defaultIndex; this.detail = detail; message2 = dialogMessage; } //Workaround. SWT does not seem to set rigth the default button if //there is not control with focus. Bug: 14668 @Override public int open() { create(); Button b = getButton(defaultButtonIndex); b.setFocus(); b.getShell().setDefaultButton(b); return super.open(); } /** * Set the detail button; */ public void setDetailButton(int index) { detailButtonID = index; } /* * (non-Javadoc) Method declared on Dialog. */ @Override protected void buttonPressed(int buttonId) { if (buttonId == detailButtonID) { toggleDetailsArea(); } else { setReturnCode(buttonId); close(); } } /** * Toggles the unfolding of the details area. This is triggered by the user pressing the details * button. */ private void toggleDetailsArea() { Point windowSize = getShell().getSize(); Point oldSize = getContents().computeSize(SWT.DEFAULT, SWT.DEFAULT); if (text != null) { text.dispose(); text = null; getButton(detailButtonID).setText(IDialogConstants.SHOW_DETAILS_LABEL); } else { createDropDownText((Composite) getContents()); getButton(detailButtonID).setText(IDialogConstants.HIDE_DETAILS_LABEL); } Point newSize = getContents().computeSize(SWT.DEFAULT, SWT.DEFAULT); getShell().setSize(new Point(windowSize.x, windowSize.y + (newSize.y - oldSize.y))); } /** * Create this dialog's drop-down list component. * * @param parent * the parent composite * @return the drop-down list component */ protected void createDropDownText(Composite parent) { // create the list text = new Text(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); // print the stacktrace in the text field try { ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintStream ps = new PrintStream(baos); detail.printStackTrace(ps); if ((detail instanceof SWTError) && (((SWTError) detail).throwable != null)) { ps.println("\n*** Stack trace of contained exception ***"); //$NON-NLS-1$ ((SWTError) detail).throwable.printStackTrace(ps); } else if ((detail instanceof SWTException) && (((SWTException) detail).throwable != null)) { ps.println("\n*** Stack trace of contained exception ***"); //$NON-NLS-1$ ((SWTException) detail).throwable.printStackTrace(ps); } ps.flush(); baos.flush(); text.setText(baos.toString()); } catch (IOException e) { } GridData data = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL | GridData.GRAB_VERTICAL); data.heightHint = text.getLineHeight() * TEXT_LINE_COUNT; text.setLayoutData(data); } public static boolean openError(Shell parent, String title, String message, Throwable detail, int defaultIndex, boolean showCancel) { String[] labels; if (detail == null) labels = showCancel ? LABELS_OK_CANCEL : LABELS_OK; else labels = showCancel ? LABELS_OK_CANCEL_DETAILS : LABELS_OK_DETAILS; ErrorDialog dialog = new ErrorDialog(parent, title, null, // accept // the // default // window // icon message, detail, ERROR, labels, defaultIndex); if (detail != null) dialog.setDetailButton(labels.length - 1); return dialog.open() == 0; } @Override protected Control createDialogArea(Composite parent) { // create a composite with standard margins and spacing Composite composite = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.marginHeight = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN); layout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN); layout.verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); layout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING); composite.setLayout(layout); composite.setLayoutData(new GridData(GridData.FILL_BOTH)); composite.setFont(parent.getFont()); ((GridLayout) composite.getLayout()).numColumns = 2; // create image Image image = composite.getDisplay().getSystemImage(SWT.ICON_ERROR); if (image != null) { Label label = new Label(composite, 0); image.setBackground(label.getBackground()); label.setImage(image); label.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_CENTER | GridData.VERTICAL_ALIGN_BEGINNING)); } // create message if (message2 != null) { Label label = new Label(composite, SWT.WRAP); label.setText(message2); GridData data = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH); label.setLayoutData(data); label.setFont(parent.getFont()); } return composite; } }