| /******************************************************************************* |
| * Copyright (c) 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.dialogs; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.custom.CLabel; |
| import org.eclipse.swt.graphics.Color; |
| import org.eclipse.swt.graphics.Image; |
| import org.eclipse.swt.layout.GridData; |
| import org.eclipse.swt.layout.GridLayout; |
| import org.eclipse.swt.widgets.Composite; |
| import org.eclipse.swt.widgets.Display; |
| import org.eclipse.swt.widgets.Label; |
| import org.eclipse.swt.widgets.Text; |
| import org.eclipse.jface.resource.JFaceColors; |
| import org.eclipse.jface.resource.JFaceResources; |
| /** |
| * The DialogMessageArea is a resusable component for adding an accessible |
| * message area to a dialog. |
| * |
| * When the message is normal a CLabel is used but an errors replaces the |
| * message area with a non editable text that can take focus for use by screen |
| * readers. |
| * |
| * @since 3.0 |
| */ |
| public class DialogMessageArea extends Object { |
| private Text messageText; |
| private Label messageImageLabel; |
| private Composite messageComposite; |
| private String lastMessageText; |
| private int lastMessageType; |
| private CLabel titleLabel; |
| /** |
| * Create a new instance of the receiver. |
| */ |
| public DialogMessageArea() { |
| //No initial behaviour |
| } |
| /** |
| * Create the contents for the receiver. |
| * |
| * @param parent |
| * the Composite that the children will be created in |
| */ |
| public void createContents(Composite parent) { |
| Display display = parent.getDisplay(); |
| Color background = JFaceColors.getBannerBackground(display); |
| Color foreground = JFaceColors.getBannerForeground(display); |
| // Message label |
| titleLabel = new CLabel(parent, SWT.NONE); |
| JFaceColors.setColors(titleLabel, foreground, background); |
| titleLabel.setFont(JFaceResources.getBannerFont()); |
| messageComposite = new Composite(parent, SWT.NONE); |
| GridLayout messageLayout = new GridLayout(); |
| messageLayout.numColumns = 2; |
| messageLayout.marginWidth = 0; |
| messageLayout.marginHeight = 0; |
| messageLayout.makeColumnsEqualWidth = false; |
| messageComposite.setLayout(messageLayout); |
| messageImageLabel = new Label(messageComposite, SWT.NONE); |
| messageImageLabel.setImage(JFaceResources |
| .getImage(Dialog.DLG_IMG_MESSAGE_INFO)); |
| messageImageLabel.setLayoutData(new GridData( |
| GridData.VERTICAL_ALIGN_CENTER)); |
| messageImageLabel.setBackground(parent.getDisplay().getSystemColor( |
| SWT.COLOR_YELLOW)); |
| messageText = new Text(messageComposite, SWT.NONE); |
| messageText.setEditable(false); |
| messageText.setBackground(parent.getDisplay().getSystemColor( |
| SWT.COLOR_RED)); |
| GridData textData = new GridData(GridData.GRAB_HORIZONTAL |
| | GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_CENTER); |
| messageText.setLayoutData(textData); |
| setMessageColors(JFaceColors.getBannerBackground(messageComposite |
| .getDisplay())); |
| } |
| /** |
| * Set the layoutData for the title area. In most cases this will be a copy |
| * of the layoutData used in setMessageLayoutData. |
| * |
| * @param layoutData |
| * the layoutData for the title |
| * @see #setMessageLayoutData(Object) |
| */ |
| public void setTitleLayoutData(Object layoutData) { |
| titleLabel.setLayoutData(layoutData); |
| } |
| /** |
| * Set the layoutData for the messageArea. In most cases this will be a copy |
| * of the layoutData used in setTitleLayoutData. |
| * |
| * @param layoutData |
| * the layoutData for the message area composite. |
| * @see #setTitleLayoutData(Object) |
| */ |
| public void setMessageLayoutData(Object layoutData) { |
| messageComposite.setLayoutData(layoutData); |
| } |
| /** |
| * Show the title. |
| * |
| * @param titleMessage |
| * String for the titke |
| * @param titleImage |
| * Image or <code>null</code> |
| */ |
| public void showTitle(String titleMessage, Image titleImage) { |
| titleLabel.setImage(titleImage); |
| titleLabel.setText(titleMessage); |
| restoreTitle(); |
| return; |
| } |
| /** |
| * Enable the title and disable the message text and image. |
| */ |
| public void restoreTitle() { |
| titleLabel.setVisible(true); |
| messageComposite.setVisible(false); |
| lastMessageText = null; |
| lastMessageType = IMessageProvider.NONE; |
| } |
| /** |
| * Show the new message in the message text and update the image. Base the |
| * background color on whether or not there are errors. |
| * |
| * @param newMessage |
| * The new value for the message |
| * @param newType |
| * One of the IMessageProvider constants. If newType is |
| * IMessageProvider.NONE show the title. |
| * @see IMessageProvider |
| */ |
| public void updateText(String newMessage, int newType) { |
| Image newImage = null; |
| boolean showingError = false; |
| switch (newType) { |
| case IMessageProvider.NONE : |
| if (newMessage == null) |
| restoreTitle(); |
| else |
| showTitle(newMessage, null); |
| return; |
| case IMessageProvider.INFORMATION : |
| newImage = JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_INFO); |
| break; |
| case IMessageProvider.WARNING : |
| newImage = JFaceResources |
| .getImage(Dialog.DLG_IMG_MESSAGE_WARNING); |
| break; |
| case IMessageProvider.ERROR : |
| newImage = JFaceResources |
| .getImage(Dialog.DLG_IMG_MESSAGE_ERROR); |
| showingError = true; |
| break; |
| } |
| messageComposite.setVisible(true); |
| titleLabel.setVisible(false); |
| // Any more updates required |
| if (newMessage.equals(messageText.getText()) |
| && newImage == messageImageLabel.getImage()) |
| return; |
| messageImageLabel.setImage(newImage); |
| messageText.setText(newMessage); |
| if (showingError) |
| setMessageColors(JFaceColors.getErrorBackground(messageComposite |
| .getDisplay())); |
| else { |
| lastMessageText = newMessage; |
| setMessageColors(JFaceColors.getBannerBackground(messageComposite |
| .getDisplay())); |
| } |
| } |
| /** |
| * Set the colors of the message area. |
| * |
| * @param color |
| * The color to be use in the message area. |
| */ |
| private void setMessageColors(Color color) { |
| messageText.setBackground(color); |
| messageComposite.setBackground(color); |
| messageImageLabel.setBackground(color); |
| } |
| /** |
| * Clear the error message. Restore the previously displayed message if |
| * there is one, if not restore the title label. |
| * |
| */ |
| public void clearErrorMessage() { |
| if (lastMessageText == null) |
| restoreTitle(); |
| else |
| updateText(lastMessageText, lastMessageType); |
| } |
| } |