chateditor.java

Eclipse Rich Client Platform Designing Coding and Packaging Java Applications的源代码

/*******************************************************************************
 * Copyright (c) 2004, 2005 Jean-Michel Lemieux, Jeff McAffer 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
 * 
 * Hyperbola is an RCP application developed for the book 
 *     Eclipse Rich Client Platform - 
 *         Designing, Coding, and Packaging Java Applications 
 *
 * Contributors:
 *     Jean-Michel Lemieux and Jeff McAffer - initial implementation
 *******************************************************************************/
package org.eclipsercp.hyperbola;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.part.EditorPart;

/**
 * An editor that presents a chat with a specified participant.
 */
public class ChatEditor extends EditorPart {

	public static String ID = "org.eclipsercp.hyperbola.editors.chat";

	private Text transcript;

	private Text entry;

	public ChatEditor() {
	}

	public void doSave(IProgressMonitor monitor) {
		// Save not supported
	}

	public void doSaveAs() {
		// Save As not supported
	}

	public void init(IEditorSite site, IEditorInput input)
			throws PartInitException {
		setSite(site);
		setInput(input);
		setPartName(getUser());
	}

	public boolean isDirty() {
		return false;
	}

	public boolean isSaveAsAllowed() {
		// Save As not supported
		return false;
	}

	public void createPartControl(Composite parent) {
		Composite top = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginWidth = 0;
		layout.marginHeight = 0;
		top.setLayout(layout);

		transcript = new Text(top, SWT.BORDER | SWT.MULTI | SWT.WRAP);
		transcript.setLayoutData(new GridData(GridData.FILL, GridData.FILL,
				true, true));
		transcript.setEditable(false);
		transcript.setBackground(transcript.getDisplay().getSystemColor(
				SWT.COLOR_INFO_BACKGROUND));
		transcript.setForeground(transcript.getDisplay().getSystemColor(
				SWT.COLOR_INFO_FOREGROUND));

		entry = new Text(top, SWT.BORDER | SWT.WRAP);
		GridData gridData = new GridData(GridData.FILL, GridData.FILL, true,
				false);
		gridData.heightHint = entry.getLineHeight() * 2;
		entry.setLayoutData(gridData);
		entry.addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent event) {
				if (event.character == SWT.CR) {
					sendMessage();
					event.doit = false;
				}
			}
		});
	}

	public void setFocus() {
		if (entry != null && !entry.isDisposed()) {
			entry.setFocus();
		}
	}

	private String getUser() {
		return ((ChatEditorInput) getEditorInput()).getName();
	}

	private String renderMessage(String from, String body) {
		if (from == null)
			return body;
		int j = from.indexOf('@');
		if (j > 0)
			from = from.substring(0, j);
		return "<" + from + ">  " + body;
	}

	private void scrollToEnd() {
		int n = transcript.getCharCount();
		transcript.setSelection(n, n);
		transcript.showSelection();
	}

	/**
	 * Sends the text in the entry field to the contact(s). The sent text will
	 * appear in the transcript area.
	 */
	private void sendMessage() {
		String body = entry.getText();
		if (body.length() == 0)
			return;
		transcript.append(renderMessage(getUser(), body));
		transcript.append("\n");
		scrollToEnd();
		entry.setText("");
	}

	public void dispose() {
	}
}