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();
            }
        });
    }
}