swt中用什么做类似qq聊天框解决思路

import java.awt.BorderLayout;import java.awt.Cursor;import java.awt.Dimension;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.Insets;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.BorderFactory;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextPane;import javax.swing.SwingUtilities;import javax.swing.UIManager;import javax.swing.text.BadLocationException;import javax.swing.text.Style;import javax.swing.text.StyleConstants;import javax.swing.text.StyleContext;import javax.swing.text.StyledDocument;public class Demo extends JPanel implements ActionListener {    private String newline = "\n";    protected JLabel actionLabel;    public Demo() {        setLayout(new BorderLayout());        //Create a label to put messages during an action event.        actionLabel = new JLabel("Type text in a field and press Enter.");        actionLabel.setBorder(BorderFactory.createEmptyBorder(10,0,0,0));        //Lay out the text controls and the labels.        JPanel textControlsPane = new JPanel();        GridBagLayout gridbag = new GridBagLayout();        GridBagConstraints c = new GridBagConstraints();        textControlsPane.setLayout(gridbag);        c.gridwidth = GridBagConstraints.REMAINDER; //last        c.anchor = GridBagConstraints.WEST;        c.weightx = 1.0;        textControlsPane.add(actionLabel, c);        textControlsPane.setBorder(                BorderFactory.createCompoundBorder(                                BorderFactory.createTitledBorder("Text Fields"),                                BorderFactory.createEmptyBorder(5,5,5,5)));        //Create a text pane.        JTextPane textPane = createTextPane();        JScrollPane paneScrollPane = new JScrollPane(textPane);        paneScrollPane.setVerticalScrollBarPolicy(                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);        paneScrollPane.setPreferredSize(new Dimension(250, 155));        paneScrollPane.setMinimumSize(new Dimension(10, 10));        //Put everything together.        add(paneScrollPane, BorderLayout.LINE_END);    }    public void actionPerformed(ActionEvent e) {    }    private JTextPane createTextPane() {        String[] initString =                { "This is an editable JTextPane, ",            //regular                  "another ",                                   //italic                  "styled ",                                    //bold                  "text ",                                      //small                  "component, ",                                //large                  "which supports embedded components..." + newline,//regular                  " " + newline,                                //button                  "...and embedded icons..." + newline,         //regular                  " ",                                          //icon                  newline + "JTextPane is a subclass of JEditorPane that " +                    "uses a StyledEditorKit and StyledDocument, and provides " +                    "cover methods for interacting with those objects."                 };        String[] initStyles =                { "regular", "italic", "bold", "small", "large",                  "regular", "button", "regular", "icon",                  "regular"                };        JTextPane textPane = new JTextPane();        StyledDocument doc = textPane.getStyledDocument();        addStylesToDocument(doc);        try {            for (int i=0; i < initString.length; i++) {                doc.insertString(doc.getLength(), initString[i],                                 doc.getStyle(initStyles[i]));            }        } catch (BadLocationException ble) {            System.err.println("Couldn't insert initial text into text pane.");        }        return textPane;    }    protected void addStylesToDocument(StyledDocument doc) {        //Initialize some styles.        Style def = StyleContext.getDefaultStyleContext().                        getStyle(StyleContext.DEFAULT_STYLE);        Style regular = doc.addStyle("regular", def);        StyleConstants.setFontFamily(def, "SansSerif");        Style s = doc.addStyle("italic", regular);        StyleConstants.setItalic(s, true);        s = doc.addStyle("bold", regular);        StyleConstants.setBold(s, true);        s = doc.addStyle("small", regular);        StyleConstants.setFontSize(s, 10);        s = doc.addStyle("large", regular);        StyleConstants.setFontSize(s, 16);        s = doc.addStyle("icon", regular);        StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER);        ImageIcon pigIcon = createImageIcon("images/Pig.gif",                                            "a cute pig");        if (pigIcon != null) {            StyleConstants.setIcon(s, pigIcon);        }        s = doc.addStyle("button", regular);        StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER);        ImageIcon soundIcon = createImageIcon("images/sound.gif",                                              "sound icon");        JButton button = new JButton();        if (soundIcon != null) {            button.setIcon(soundIcon);        } else {            button.setText("BEEP");        }        button.setCursor(Cursor.getDefaultCursor());        button.setMargin(new Insets(0,0,0,0));        button.addActionListener(this);        StyleConstants.setComponent(s, button);    }    /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path,                                               String description) {        java.net.URL imgURL = Demo.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL, description);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event dispatch thread.     */    private static void createAndShowGUI() {        //Create and set up the window.        JFrame frame = new JFrame("TextSamplerDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Add content to the window.        frame.add(new Demo());        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event dispatching thread:        //creating and showing this application's GUI.        SwingUtilities.invokeLater(new Runnable() {            public void run() {                 //Turn off metal's use of bold fonts        UIManager.put("swing.boldMetal", Boolean.FALSE);        createAndShowGUI();            }        });    }}