PC Plus SuperCD (UK) 2000 March/pcp161a.iso/handson/files/java/MyEditor.java

Java Source | 1999-11-28 | 4.3 KB | 170 lines

/*
 * @(#)MyEditor.java    1.0 99/11/27
 *
 * Copyright (c) 1999, David Griffiths. All Rights Reserved.
 *
 * This software is the proprietary information of David Griffiths.
 * This source code may not be published or redistributed without the
 * express permission of the author.
 *
 * THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY
 * OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 *
 */

import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.applet.*;
import com.sun.java.swing.*;
import com.sun.java.swing.text.*;
import com.sun.java.swing.preview.*;
import com.sun.java.swing.text.html.*;
import com.sun.java.swing.event.*;

/**
 * An example showing a toolbar connected to an RTF editor.
 */
public class MyEditor extends JPanel implements ActionListener {
    private JPanel pan1;
    private JEditorPane edRTF;
    private EditorKit ekRTF;
    private JToolBar toolMain;
    private JApplet applet;
    private JButton btnChange;

    public MyEditor(JApplet applet) {
        setLayout(new BorderLayout());

        this.applet = applet;

        edRTF = addEditor(this, "test.rtf");
        Hashtable actions = getActions(edRTF);

        toolMain = new JToolBar();

        // Add buttons to the toolbar
        addToolButton(toolMain, "B", "Bold", "font-bold", actions);
        addToolButton(toolMain, "I", "Italic", "font-italic", actions);
        addToolButton(toolMain, "10", "10 pt", "font-size-10", actions);
        addToolButton(toolMain, "12", "12 pt", "font-size-12", actions);
        addToolButton(toolMain, "14", "14 pt", "font-size-14", actions);
        addToolButton(toolMain, "16", "16 pt", "font-size-16", actions);
        addToolButton(toolMain, "18", "18 pt", "font-size-18", actions);
        addToolButton(toolMain, "<", "Left justify", "left-justify", actions);
        addToolButton(toolMain, ">", "Right justify", "right-justify", actions);

        // Button to change background colour
        btnChange = new JButton("Colour");
        btnChange.addActionListener(this);
        btnChange.setToolTipText("Change background");
        toolMain.add(btnChange);

        add(toolMain, BorderLayout.NORTH);
    }


    /**
     * Create editor
     */
    private JEditorPane addEditor(JPanel panel, String docName) {
        JEditorPane editor = new JEditorPane();

        EditorKit ek = editor.getEditorKitForContentType("application/rtf");

        editor.setEditorKit(ek);

        editor.setEditable(true);

        try {
            ek.read(openDataFile(docName), editor.getDocument(), 0);
        }
        catch(BadLocationException e) {
            System.err.println(
                "Start position in doc doesn't exist: "
                    + e
            );
        }
        catch(IOException e) {
            System.err.println(
                "Can't open file: "
                    + docName
                    + e
            );
        }

        panel.add(new JScrollPane(editor), BorderLayout.CENTER);

        return editor;
    }

    private Hashtable getActions(JEditorPane editor) {
        EditorKit ek = editor.getEditorKit();

        Action actionArray[] = ek.getActions();

        Hashtable actions = new Hashtable();

        for (int i = 0; i < actionArray.length; i++)
            actions.put(
                actionArray[i].getValue(Action.NAME),
                actionArray[i]
            );

        return actions;
    }

    /**
     * Add a button to a toolbar, displaying text str and with action a
     */
    private void addToolButton(JToolBar toolbar, String str,
            String desc, String a, Hashtable actions) {
        JButton btn = new JButton(str);
        btn.setToolTipText(desc);
        btn.addActionListener((Action)actions.get(a));
        toolbar.add(btn);
    }

    /**
     * Method to pick up clicks to the colour change button
     */
    public void actionPerformed(ActionEvent e) {
        edRTF.setBackground(
            JColorChooser.showDialog(
                this,
                "MyEditor's colour chooser",
                Color.white
            )
        );
        edRTF.repaint();
    }

    /**
     * Open the data file.
     *
     * @param    dataFile - the name of the datafile
     * @returns the input stream for the file
     */
    private DataInputStream openDataFile(String dataFile) {
        URL fileURL;
        DataInputStream in = null;

        try {
            fileURL = new URL(applet.getDocumentBase(), dataFile);
            in = new DataInputStream(new BufferedInputStream(fileURL.openStream()));
        }
        catch (IOException e) {
            System.err.println("Cannot open " + dataFile + ": " + e.getMessage());
        }
        return in;
    }
}