Texteditor mit Formatierung

// StyleFrame.java
// A JTextPane with a menu for Style manipulation.

import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.event.*;

public class StyleFrame extends JFrame implements ActionListener {

  protected StyleBox styleBox;
  protected JTextPane textPane;
  protected JMenuBar menuBar;
  protected JMenu applyStyleMenu, modifyStyleMenu;
  protected JMenuItem createItem;

  public StyleFrame() {
    super("StyleFrame");

    styleBox = new StyleBox();
    textPane = new JTextPane();
    getContentPane().add(new JScrollPane(textPane), BorderLayout.CENTER);

    // set up menu
    menuBar = new JMenuBar();
    JMenu styleMenu = new JMenu("Style");
    menuBar.add(styleMenu);
    setJMenuBar(menuBar);

    applyStyleMenu = new JMenu("Set Logical Style");
    applyStyleMenu.setToolTipText(
        "set the Logical Style for the paragraph at caret location");
    styleMenu.add(applyStyleMenu);

    modifyStyleMenu = new JMenu("Modify Style");
    modifyStyleMenu.setToolTipText(
        "redefine a named Style (will affect paragraphs using that style)");
    styleMenu.add(modifyStyleMenu);

    createItem = new JMenuItem("Create New Style");
    createItem.setToolTipText(
        "define a new Style (which can then be applied to paragraphs)");
    createItem.addActionListener(this);
    styleMenu.add(createItem);

    // add the default style to applyStyleMenu and modifyStyleMenu
    createMenuItems(StyleContext.DEFAULT_STYLE);
  }

  protected void createMenuItems(String styleName) {
    // add 'styleName' to applyStyleMenu and modifyStyleMenu
    JMenuItem applyItem = new JMenuItem(styleName);
    applyItem.addActionListener(this);
    applyStyleMenu.add(applyItem);

    JMenuItem modifyItem = new JMenuItem(styleName);
    modifyItem.addActionListener(this);
    modifyStyleMenu.add(modifyItem);
  }

  public void actionPerformed(ActionEvent e) {
    // determine which menuItem was invoked and process it
    JMenuItem source = (JMenuItem)e.getSource();

    if ( applyStyleMenu.isMenuComponent(source) ) {
      // apply an existing style to the paragraph at the caret position
      String styleName = source.getActionCommand();
      Style style = textPane.getStyle(styleName);
      textPane.setLogicalStyle(style);
    }

    if ( source == createItem ) {
      // define a new Style and add it to the menus
      styleBox.clear();
      int response = JOptionPane.showConfirmDialog(this, styleBox,
          "Style Editor", JOptionPane.OK_CANCEL_OPTION,
          JOptionPane.PLAIN_MESSAGE);
      if (response == JOptionPane.OK_OPTION
      		&& styleBox.getStyleName() != null
          && styleBox.getStyleName().length() > 0) {
        String styleName = styleBox.getStyleName();
        Style style = textPane.addStyle(styleName, null);
        styleBox.fillStyle(style);
        createMenuItems(styleName); // add new Style to the menus
      }  
    }

    if ( modifyStyleMenu.isMenuComponent(source) ) {
      // redefine a Style (will automatically redraw paragraphs using Style)
      String styleName = source.getActionCommand();
      Style style = textPane.getStyle(styleName);
      styleBox.loadFromStyle(style);
      int response = JOptionPane.showConfirmDialog(this, styleBox,
          "Style Editor", JOptionPane.OK_CANCEL_OPTION,
          JOptionPane.PLAIN_MESSAGE);
      if (response == JOptionPane.OK_OPTION) styleBox.fillStyle(style);
    }
  }

  public static void main(String[] args) {
    JFrame frame = new StyleFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 300);
    frame.setVisible(true);
  }
} 


// StyleBox.java
// A control panel that can be used to edit a style's paragraph attributes.

import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;

public class StyleBox extends JPanel {

  private static final String[] fonts = {"Monospaced", "Serif", "SansSerif"};
  private static final String[] sizes = {"8", "10", "12", "18", "24", "36"};

  private JTextField nameField;
  private JComboBox fontCombo, sizeCombo;
  private JTextField leftField, rightField, aboveField, belowField;
  private JCheckBox boldCheck, italicCheck;

  public StyleBox() {
    // create the fields and lay them out
    super(new BorderLayout(4, 4));
    JPanel labelPanel = new JPanel(new GridLayout(8, 1, 0, 2));
    JPanel valuePanel = new JPanel(new GridLayout(8, 1, 0, 2));
    add(labelPanel, BorderLayout.WEST);
    add(valuePanel, BorderLayout.CENTER);
    JLabel lab;
    JPanel sidePanel;
    
    lab = new JLabel("Style Name", SwingConstants.RIGHT);
    labelPanel.add(lab);
    nameField = new JTextField();
    lab.setLabelFor(nameField);
    valuePanel.add(nameField);

    lab = new JLabel("Font", SwingConstants.RIGHT);
    labelPanel.add(lab);
    fontCombo = new JComboBox(fonts);
    fontCombo.setEditable(true); // user may enter custom value
    lab.setLabelFor(fontCombo);
    valuePanel.add(fontCombo);

    lab = new JLabel("Size", SwingConstants.RIGHT);
    labelPanel.add(lab);
    sizeCombo = new JComboBox(sizes);
    sizeCombo.setEditable(true); // user may enter custom value
    lab.setLabelFor(sizeCombo);
    sidePanel = new JPanel(new BorderLayout(4, 0));
    sidePanel.add(sizeCombo, BorderLayout.CENTER);
    sidePanel.add(new JLabel("points"), BorderLayout.EAST);
    valuePanel.add(sidePanel);

    lab = new JLabel("Left Indent", SwingConstants.RIGHT);
    labelPanel.add(lab);
    leftField = new JTextField();
    lab.setLabelFor(leftField);
    sidePanel = new JPanel(new BorderLayout(4, 0));
    sidePanel.add(leftField, BorderLayout.CENTER);
    sidePanel.add(new JLabel("points"), BorderLayout.EAST);
    valuePanel.add(sidePanel);

    lab = new JLabel("Right Indent", SwingConstants.RIGHT);
    labelPanel.add(lab);
    rightField = new JTextField();
    lab.setLabelFor(rightField);
    sidePanel = new JPanel(new BorderLayout(4, 0));
    sidePanel.add(rightField, BorderLayout.CENTER);
    sidePanel.add(new JLabel("points"), BorderLayout.EAST);
    valuePanel.add(sidePanel);

    lab = new JLabel("Space Above", SwingConstants.RIGHT);
    labelPanel.add(lab);
    aboveField = new JTextField();
    lab.setLabelFor(aboveField);
    sidePanel = new JPanel(new BorderLayout(4, 0));
    sidePanel.add(aboveField, BorderLayout.CENTER);
    sidePanel.add(new JLabel("points"), BorderLayout.EAST);
    valuePanel.add(sidePanel);

    lab = new JLabel("Space Below", SwingConstants.RIGHT);
    labelPanel.add(lab);
    belowField = new JTextField();
    lab.setLabelFor(belowField);
    sidePanel = new JPanel(new BorderLayout(4, 0));
    sidePanel.add(belowField, BorderLayout.CENTER);
    sidePanel.add(new JLabel("points"), BorderLayout.EAST);
    valuePanel.add(sidePanel);

    boldCheck = new JCheckBox("Bold");
    italicCheck = new JCheckBox("Italic");
    sidePanel = new JPanel(new GridLayout(1, 2));
    sidePanel.add(boldCheck);
    sidePanel.add(italicCheck);
    valuePanel.add(sidePanel);

    clear(); // sets initial values, etc.
  }

  public void clear() {
    // reset all fields (also sets nameField to be editable)
    nameField.setText("");
    nameField.setEditable(true);
    fontCombo.setSelectedIndex(0);
    sizeCombo.setSelectedIndex(2);
    leftField.setText("0.0");
    rightField.setText("0.0");
    aboveField.setText("0.0");
    belowField.setText("0.0");
    boldCheck.setSelected(false);
    italicCheck.setSelected(false);
  }

  public String getStyleName() {
    // return the name of the style
    String name = nameField.getText();
    if (name.length() > 0)
      return name;
    else
      return null;
  }

  public void fillStyle(Style style) {
    // mutate 'style' with the values entered in the fields
    // (no value checking--could throw NumberFormatException)
    String font = (String)fontCombo.getSelectedItem();
    StyleConstants.setFontFamily(style, font);

    String size = (String)sizeCombo.getSelectedItem();
    StyleConstants.setFontSize(style, Integer.parseInt(size));

    String left = leftField.getText();
    StyleConstants.setLeftIndent(style, Float.valueOf(left).floatValue());

    String right = rightField.getText();
    StyleConstants.setRightIndent(style, Float.valueOf(right).floatValue());

    String above = aboveField.getText();
    StyleConstants.setSpaceAbove(style, Float.valueOf(above).floatValue());

    String below = belowField.getText();
    StyleConstants.setSpaceBelow(style, Float.valueOf(below).floatValue());

    boolean bold = boldCheck.isSelected();
    StyleConstants.setBold(style, bold);

    boolean italic = italicCheck.isSelected();
    StyleConstants.setItalic(style, italic);
  }

  // Load the form from an existing Style.
  public void loadFromStyle(Style style) {
    nameField.setText(style.getName());
    nameField.setEditable(false); // don't allow name change

    String fam = StyleConstants.getFontFamily(style);
    fontCombo.setSelectedItem(fam);

    int size = StyleConstants.getFontSize(style);
    sizeCombo.setSelectedItem(Integer.toString(size));

    float left = StyleConstants.getLeftIndent(style);
    leftField.setText(Float.toString(left));

    float right = StyleConstants.getRightIndent(style);
    rightField.setText(Float.toString(right));

    float above = StyleConstants.getSpaceAbove(style);
    aboveField.setText(Float.toString(above));

    float below = StyleConstants.getSpaceBelow(style);
    belowField.setText(Float.toString(below));

    boolean bold = StyleConstants.isBold(style);
    boldCheck.setSelected(bold);

    boolean italic = StyleConstants.isItalic(style);
    italicCheck.setSelected(italic);
  }
}