Simple Editor Demo
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// SimpleEditor.java
//An example showing several DefaultEditorKit features. This class is designed
//to be easily extended for additional functionality.
//
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Hashtable;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.JToolBar;
import javax.swing.text.DefaultEditorKit;
import javax.swing.text.JTextComponent;
public class SimpleEditor extends JFrame {
private Action openAction = new OpenAction();
private Action saveAction = new SaveAction();
private JTextComponent textComp;
private Hashtable actionHash = new Hashtable();
public static void main(String[] args) {
SimpleEditor editor = new SimpleEditor();
editor.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
editor.setVisible(true);
}
// Create an editor.
public SimpleEditor() {
super("Swing Editor");
textComp = createTextComponent();
makeActionsPretty();
Container content = getContentPane();
content.add(textComp, BorderLayout.CENTER);
content.add(createToolBar(), BorderLayout.NORTH);
setJMenuBar(createMenuBar());
setSize(320, 240);
}
// Create the JTextComponent subclass.
protected JTextComponent createTextComponent() {
JTextArea ta = new JTextArea();
ta.setLineWrap(true);
return ta;
}
// Add icons and friendly names to actions we care about.
protected void makeActionsPretty() {
Action a;
a = textComp.getActionMap().get(DefaultEditorKit.cutAction);
a.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
a.putValue(Action.NAME, "Cut");
a = textComp.getActionMap().get(DefaultEditorKit.copyAction);
a.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
a.putValue(Action.NAME, "Copy");
a = textComp.getActionMap().get(DefaultEditorKit.pasteAction);
a.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));
a.putValue(Action.NAME, "Paste");
a = textComp.getActionMap().get(DefaultEditorKit.selectAllAction);
a.putValue(Action.NAME, "Select All");
}
// Create a simple JToolBar with some buttons.
protected JToolBar createToolBar() {
JToolBar bar = new JToolBar();
// Add simple actions for opening & saving.
bar.add(getOpenAction()).setText("");
bar.add(getSaveAction()).setText("");
bar.addSeparator();
// Add cut/copy/paste buttons.
bar.add(textComp.getActionMap().get(DefaultEditorKit.cutAction))
.setText("");
bar.add(textComp.getActionMap().get(DefaultEditorKit.copyAction))
.setText("");
bar.add(textComp.getActionMap().get(DefaultEditorKit.pasteAction))
.setText("");
return bar;
}
// Create a JMenuBar with file & edit menus.
protected JMenuBar createMenuBar() {
JMenuBar menubar = new JMenuBar();
JMenu file = new JMenu("File");
JMenu edit = new JMenu("Edit");
menubar.add(file);
menubar.add(edit);
file.add(getOpenAction());
file.add(getSaveAction());
file.add(new ExitAction());
edit.add(textComp.getActionMap().get(DefaultEditorKit.cutAction));
edit.add(textComp.getActionMap().get(DefaultEditorKit.copyAction));
edit.add(textComp.getActionMap().get(DefaultEditorKit.pasteAction));
edit.add(textComp.getActionMap().get(DefaultEditorKit.selectAllAction));
return menubar;
}
// Subclass can override to use a different open action.
protected Action getOpenAction() {
return openAction;
}
// Subclass can override to use a different save action.
protected Action getSaveAction() {
return saveAction;
}
protected JTextComponent getTextComponent() {
return textComp;
}
// ********** ACTION INNER CLASSES ********** //
// A very simple exit action
public class ExitAction extends AbstractAction {
public ExitAction() {
super("Exit");
}
public void actionPerformed(ActionEvent ev) {
System.exit(0);
}
}
// An action that opens an existing file
class OpenAction extends AbstractAction {
public OpenAction() {
super("Open", new ImageIcon("icons/open.gif"));
}
// Query user for a filename and attempt to open and read the file into
// the
// text component.
public void actionPerformed(ActionEvent ev) {
JFileChooser chooser = new JFileChooser();
if (chooser.showOpenDialog(SimpleEditor.this) != JFileChooser.APPROVE_OPTION)
return;
File file = chooser.getSelectedFile();
if (file == null)
return;
FileReader reader = null;
try {
reader = new FileReader(file);
textComp.read(reader, null);
} catch (IOException ex) {
JOptionPane.showMessageDialog(SimpleEditor.this,
"File Not Found", "ERROR", JOptionPane.ERROR_MESSAGE);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException x) {
}
}
}
}
}
// An action that saves the document to a file
class SaveAction extends AbstractAction {
public SaveAction() {
super("Save", new ImageIcon("icons/save.gif"));
}
// Query user for a filename and attempt to open and write the text
// component's content to the file.
public void actionPerformed(ActionEvent ev) {
JFileChooser chooser = new JFileChooser();
if (chooser.showSaveDialog(SimpleEditor.this) != JFileChooser.APPROVE_OPTION)
return;
File file = chooser.getSelectedFile();
if (file == null)
return;
FileWriter writer = null;
try {
writer = new FileWriter(file);
textComp.write(writer);
} catch (IOException ex) {
JOptionPane.showMessageDialog(SimpleEditor.this,
"File Not Saved", "ERROR", JOptionPane.ERROR_MESSAGE);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException x) {
}
}
}
}
}
}
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