conversationarea.java

网站即时通讯系统

/*
 Copyright (C) 2003 Adam Olsen

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 1, or (at your option)
 any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package com.valhalla.jbother;

import java.awt.Color;
import java.awt.Font;
import java.awt.Point;
import java.awt.event.*;
import java.io.File;
import java.io.OutputStreamWriter;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.Vector;
import java.util.regex.Pattern;

import javax.swing.JEditorPane;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.StyleSheet;

import com.valhalla.gui.Standard;
import com.valhalla.settings.Settings;

/**
 * Represents an appending JEditorPane. Text appended to this pane will cause
 * it's scrollbar to scroll to the bottom. Also handles hyperlink events
 *
 * @author Adam Olsen
 * @version 1.1
 */
public class ConversationArea extends JEditorPane implements HyperlinkListener {
    private ResourceBundle resources = ResourceBundle.getBundle(
            "JBotherBundle", Locale.getDefault());

    private JScrollPane scroll;

    private HTMLEditorKit kit = (HTMLEditorKit) getEditorKit();

    private HTMLDocument doc = (HTMLDocument) getDocument();

    private javax.swing.Timer timer;

    private Vector lines = new Vector();

    private StyleSheet myStyleSheet = new StyleSheet();

    protected PrintWriter logOut;

    private OutputStreamWriter fw;

    private boolean next = false;

    /**
     * Default constructor - sets up the JEditorPane
     *
     * @param bufferTime
     *            the buffer delay in milliseconds
     */
    public ConversationArea() {
        super("text/html; enctype='UTF-8'", "");

        timer = new javax.swing.Timer(50, new ShowHandler());
        String fontString = Settings.getInstance().getProperty(
                "messageWindowFont");
        Font windowFont;
        if (fontString == null)
            windowFont = new Font("Sans", Font.PLAIN, 12);
        else
            windowFont = Font.decode(fontString);

        loadStyleSheet(windowFont);

        kit.setStyleSheet(myStyleSheet);
        doc = new HTMLDocument(myStyleSheet);
        setDocument(doc);
        setEditable(false);

        addHyperlinkListener(this);
        setBackground(Color.WHITE);


    }




    /**
     * Sets the log file
     *
     * @param logFile
     *            the file to use for logging
     * @param encoding
     *            the encoding of the log file
     *            (if null, empty, or invalid, the platform default encoding will
     *            be used)
     */
    public void setLogFile(File logFile, String encoding) {
        try {
            fw = null;
            try {
                fw = new OutputStreamWriter(
                    new FileOutputStream(logFile, true), encoding);
            } catch (UnsupportedEncodingException ex) {
            } catch (NullPointerException ex) {
            }
            if (fw == null) {
                fw = new OutputStreamWriter(
                    new FileOutputStream(logFile, true));
            }
            logOut = new PrintWriter(fw, true);
        } catch (Exception ex) {
            fw = null;
        }
    }

    /**
     * Closes the log file
     */
    public void closeLog() {
        if (fw == null)
            return;
        try {
            fw.close();
        } catch (Exception e) {
        }
    }

    /**
     * Loads a new font for the JEditorPane
     *
     * @param windowFont
     *            the font to load
     */
    public void loadStyleSheet(Font windowFont) {
        String ruleString = "font-size: " + windowFont.getSize()
                + "; font-family: " + windowFont.getName() + "; ";
        if (windowFont.isItalic())
            ruleString += "font-style: italic; ";
        else
            ruleString += "font-style: normal; ";

        if (windowFont.isBold())
            ruleString += "font-weight: bold; ";
        else
            ruleString += "font-weight: normal; ";

        myStyleSheet.addRule("body { " + ruleString + " }");
        myStyleSheet
                .addRule("body a { color: #5B62BC; text-decoration: underline }");
    }

    /**
     * Sets this window's scrollbar
     *
     * @param scroll
     *            the scrollbar
     */
    public void setScroll(JScrollPane scroll) {
        this.scroll = scroll;
    }

    /**
     * Appends text to the ConversationArea Scrolls down if the scrollbar is
     * already at the bottom, or does nothing if the person has scrolled up any
     *
     * @param html
     *            the text to append
     */
    public void append(String html) {
        int index = html.indexOf("\n");
        while (index > -1) {
            String newHtml = html.substring(0, index);
            html = html.substring(index + 1);
            append(newHtml);
            index = html.indexOf("\n");
        }

        if (html.equals("")) {
            html = " ";
        }

        html = html.replaceAll("^/", "/");

        lines.add(html);
        if (!timer.isRunning())
            timer.start();
    }

    /**
     * Actually appends the buffered data to the JEditorPane
     *
     * @author Adam Olsen
     * @version 2.0
     */
    class ShowHandler implements ActionListener {
        public synchronized void actionPerformed(ActionEvent ae) {
            if (lines.size() > 0) {
                String line = (String) lines.firstElement();

                JScrollBar bar = scroll.getVerticalScrollBar();

                boolean end = bar.getValue()
                        - (bar.getMaximum() - bar.getModel().getExtent()) >= -16;
                Point p = scroll.getViewport().getViewPosition();

                boolean scrFlag = bar.isVisible();
                p.y += 50; // just so it's not the first line (might scroll a
                           // bit)
                int pos = viewToModel(p);

                if (pos < 0)
                    pos = 0;

                try {
                    if (logOut != null) {
                        logOut.println(line + "<br>");
                    }

                    // replace emoticon symbols
                    String emoLine = Emoticons.getInstance().replaceIcons(line);
                    kit.insertHTML(doc, doc.getLength(), emoLine, 0, 0, null);

                    if (!end && scrFlag)
                        setCaretPosition(pos);
                    else
                        setCaretPosition(doc.getLength());
                    scroll.repaint();
                } catch (Exception e) {
                    com.valhalla.Logger.debug("ShowHandler.class Exception: "
                            + e.toString());
                }

                lines.remove(line);
            }

            if (lines.size() == 0)
                timer.stop();

            repaint();
        }
    }

    /**
     * Appends text without buffering
     *
     * @param line
     *            the text to append
     */
    public void plainAppend(String line) {
        try {
            // replace emoticon symbols
            line = Emoticons.getInstance().replaceIcons(line);
            kit.insertHTML(doc, doc.getLength(), line, 0, 0, null);
        } catch (Exception ex) {
        }
    }

    /**
     * Moves the cursor to the end of the editorpane
     */
    public void moveToEnd() {
        try {
            setCaretPosition(doc.getLength());
        } catch (Exception e) {
        }
    }

    /**
     * Is called when someone clicks on a hyperlink in the window
     */
    public void hyperlinkUpdate(HyperlinkEvent e) {
        if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
            try {
                String app = Settings.getInstance().getProperty(
                        "browserApplication");
                if (Pattern.matches("^mailto\\:.*", e.getURL().toString()))
                    app = Settings.getInstance()
                            .getProperty("emailApplication");

                if (app != null && !app.equals("")) {
                    /* tail */
                    String command = app
                            .replaceAll("%s", e.getURL().toString());
                    command = command.replaceAll("\\%l", e.getURL().toString()); // for
                                                                                 // backwards
                                                                                 // compatability

                    Runtime.getRuntime().exec(command);
                    /* tail */
                } else
                    Standard.warningMessage(this, resources
                            .getString("hyperlink"), resources
                            .getString("noApplication"));
            } catch (java.io.IOException ex) {
                Standard.warningMessage(this, resources.getString("hyperlink"),
                        resources.getString("errorExecutingApplication"));
            }
        }
    }

}