Charles Bell
Posts: 519
Nickname: charles
Registered: Feb, 2002
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Re: String padding
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Posted: Jun 29, 2002 12:26 PM
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In a TextArea or JTextArea there are no methods to make a line of text centered or left or right justified.
So to get a desired affect you have to program it yourself to add lines with extra space or tabs to make it appear as deisred.
You would have to step up to a JTextPane to use styled text that can be easily programmed to align as desired. The following code uses some of the built in editor text actions.
/* DocumentEditor.java
* @author: Charles Bell
* @version: June 29, 2002
*
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
public class DocumentEditor extends JFrame implements ActionListener{
private StyledDocument document;
private JTextPane textPane;
private boolean debug = false;
private File currentFile;
public DocumentEditor(){
super("DocumentEditor");
document = new DefaultStyledDocument();
init();
}
public DocumentEditor(StyledDocument document){
super("DocumentEditor");
this.document = document;
init();
}
public static void main(String[] args){
DocumentEditor editor = new DocumentEditor();
}
public void init(){
addWindowListener(new FrameListener());
Action cutAction = new DefaultEditorKit.CutAction();
Action copyAction = new DefaultEditorKit.CopyAction();
Action pasteAction = new DefaultEditorKit.PasteAction();
Action boldAction = new StyledEditorKit.BoldAction();
Action underlineAction = new StyledEditorKit.UnderlineAction();
Action italicAction = new StyledEditorKit.ItalicAction();
Action insertAction = new StyledEditorKit.InsertContentAction();
Action insertBreakAction = new DefaultEditorKit.InsertBreakAction();
Action tabAction = new DefaultEditorKit.InsertTabAction();
Action leftAlignmentAction = new StyledEditorKit.AlignmentAction("Left",StyleConstants.ALIGN_LEFT);
Action centerAlignmentAction = new StyledEditorKit.AlignmentAction("Center",StyleConstants.ALIGN_CENTER);
Action rightAlignmentAction = new StyledEditorKit.AlignmentAction("Right",StyleConstants.ALIGN_RIGHT);
JMenuBar menuBar = new JMenuBar();
getContentPane().add(menuBar, BorderLayout.NORTH);
JMenu fileMenu = new JMenu("File");
JMenu editMenu = new JMenu("Edit");
JMenu formatMenu = new JMenu("Fomat");
JMenu helpMenu = new JMenu("Help");
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(formatMenu);
menuBar.add(helpMenu);
JMenuItem newItem = new JMenuItem("New");
JMenuItem openItem = new JMenuItem("Open");
JMenuItem saveItem = new JMenuItem("Save");
JMenuItem saveAsItem = new JMenuItem("Save As");
JMenuItem exitItem = new JMenuItem("Exit");
newItem.addActionListener(this);
openItem.addActionListener(this);
saveItem.addActionListener(this);
saveAsItem.addActionListener(this);
exitItem.addActionListener(this);
fileMenu.add(newItem);
fileMenu.add(openItem);
fileMenu.add(saveItem);
fileMenu.add(saveAsItem);
fileMenu.add(exitItem);
JMenuItem cutItem = new JMenuItem(cutAction);
JMenuItem copyItem = new JMenuItem(copyAction);
JMenuItem pasteItem = new JMenuItem(pasteAction);
JMenuItem clearItem = new JMenuItem("Clear");
JMenuItem selectAllItem = new JMenuItem("Select All");
cutItem.setText("Cut");
copyItem.setText("Copy");
pasteItem.setText("Paste");
cutItem.setIcon(new ImageIcon("cut.gif"));
copyItem.setIcon(new ImageIcon("copy.gif"));
pasteItem.setIcon(new ImageIcon("paste.gif"));
clearItem.addActionListener(this);
selectAllItem.addActionListener(this);
editMenu.add(cutItem);
editMenu.add(copyItem);
editMenu.add(pasteItem);
editMenu.add(clearItem);
editMenu.add(selectAllItem);
JMenu fontTypeMenu = new JMenu("Font Type");
formatMenu.add(fontTypeMenu);
String[] fontTypes = {"SansSerif", "Serif", "Monospaced", "Dialog", "DialogInput"};
for (int i = 0; i < fontTypes.length;i++){
if (debug) System.out.println(fontTypes[i]);
JMenuItem nextTypeItem = new JMenuItem(fontTypes[i]);
nextTypeItem.setAction(new StyledEditorKit.FontFamilyAction(fontTypes[i], fontTypes[i]));
fontTypeMenu.add(nextTypeItem);
}
JMenu fontSizeMenu = new JMenu("Font Size");
formatMenu.add(fontSizeMenu);
int[] fontSizes = {6, 8,10,12,14, 16, 20,24, 32,36,48,72};
for (int i = 0; i < fontSizes.length;i++){
if (debug) System.out.println(fontSizes[i]);
JMenuItem nextSizeItem = new JMenuItem(String.valueOf(fontSizes[i]));
nextSizeItem.setAction(new StyledEditorKit.FontSizeAction(String.valueOf(fontSizes[i]), fontSizes[i]));
fontSizeMenu.add(nextSizeItem);
}
JMenuItem leftMenuItem = new JMenuItem(leftAlignmentAction);
JMenuItem centerMenuItem = new JMenuItem(centerAlignmentAction);
JMenuItem rightMenuItem = new JMenuItem(rightAlignmentAction);
formatMenu.add(leftMenuItem);
formatMenu.add(centerMenuItem);
formatMenu.add(rightMenuItem);
JMenuItem helpItem = new JMenuItem("Help");
helpItem.addActionListener(this);
helpMenu.add(helpItem);
JMenuItem shortcutsItem = new JMenuItem("Keyboard Shortcuts");
shortcutsItem.addActionListener(this);
helpMenu.add(shortcutsItem);
JPanel editorControlPanel = new JPanel();
editorControlPanel.setLayout(new FlowLayout());
/* JButtons */
JButton cutButton = new JButton(cutAction);
JButton copyButton = new JButton(copyAction);
JButton pasteButton = new JButton(pasteAction);
JButton boldButton = new JButton(boldAction);
JButton underlineButton = new JButton(underlineAction);
JButton italicButton = new JButton(italicAction);
//JButton insertButton = new JButton(insertAction);
//JButton insertBreakButton = new JButton(insertBreakAction);
//JButton tabButton = new JButton(tabAction);
cutButton.setText("Cut");
copyButton.setText("Copy");
pasteButton.setText("Paste");
boldButton.setText("Bold");
underlineButton.setText("Underline");
italicButton.setText("Italic");
//insertButton.setText("Insert");
//insertBreakButton.setText("Insert Break");
//tabButton.setText("Tab");
cutButton.setIcon(new ImageIcon("cut.gif"));
copyButton.setIcon(new ImageIcon("copy.gif"));
pasteButton.setIcon(new ImageIcon("paste.gif"));
boldButton.setIcon(new ImageIcon("bold.gif"));
underlineButton.setIcon(new ImageIcon("underline.gif"));
italicButton.setIcon(new ImageIcon("italic.gif"));
editorControlPanel.add(cutButton);
editorControlPanel.add(copyButton);
editorControlPanel.add(pasteButton);
editorControlPanel.add(boldButton);
editorControlPanel.add(underlineButton);
editorControlPanel.add(italicButton);
//editorControlPanel.add(insertButton);
//editorControlPanel.add(insertBreakButton);
//editorControlPanel.add(tabButton);
textPane = new JTextPane(document);
JScrollPane scrollPane = new JScrollPane(textPane);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension scrollPaneSize = new Dimension(5*screenSize.width/8,5*screenSize.height/8);
scrollPane.setPreferredSize(scrollPaneSize);
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(editorControlPanel, BorderLayout.NORTH);
panel.add(scrollPane, BorderLayout.SOUTH);
getContentPane().add(panel, BorderLayout.CENTER);
pack();
setLocationRelativeTo(null);
show();
}
public void actionPerformed(ActionEvent ae){
String actionCommand = ae.getActionCommand();
if (debug){
int modifier = ae.getModifiers();
long when = ae.getWhen();
String parameter = ae.paramString();
System.out.println("actionCommand: " + actionCommand);
System.out.println("modifier: " + modifier);
System.out.println("when: " + when);
System.out.println("parameter: " + parameter);
}
if (actionCommand.compareTo("New") == 0){
startNewDocument();
} else if (actionCommand.compareTo("Open") == 0){
openDocument();
} else if (actionCommand.compareTo("Save") == 0){
saveDocument();
} else if (actionCommand.compareTo("Save As") == 0){
saveDocumentAs();
} else if (actionCommand.compareTo("Exit") == 0){
exit();
} else if (actionCommand.compareTo("Clear") == 0){
clear();
} else if (actionCommand.compareTo("Select All") == 0){
selectAll();
} else if (actionCommand.compareTo("Help") == 0){
help();
} else if (actionCommand.compareTo("Keyboard Shortcuts") == 0){
showShortcuts();
}
}
public void startNewDocument(){
document = new DefaultStyledDocument();
textPane.setDocument(document);
}
public void openDocument(){
try{
File current = new File(".");
JFileChooser chooser = new JFileChooser(current);
chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
int approval = chooser.showSaveDialog(this);
if (approval == JFileChooser.APPROVE_OPTION){
currentFile = chooser.getSelectedFile();
FileInputStream fin = new FileInputStream(currentFile);
ObjectInputStream istrm = new ObjectInputStream(fin);
Document doc = (Document) istrm.readObject();
textPane.setDocument(doc);
setTitle(currentFile.getName());
}
}catch(ClassNotFoundException cnfe){
System.err.println("ClassNotFoundException: " + cnfe.getMessage());
}catch(FileNotFoundException fnfe){
System.err.println("FileNotFoundException: " + fnfe.getMessage());
}catch(IOException ioe){
System.err.println("IOException: " + ioe.getMessage());
}
}
public void saveDocument(){
if (currentFile != null){
try{
FileOutputStream fos = new FileOutputStream(currentFile);
ObjectOutput oos = new ObjectOutputStream(fos);
oos.writeObject(textPane.getDocument());
oos.flush();
fos.close();
}catch(FileNotFoundException fnfe){
System.err.println("FileNotFoundException: " + fnfe.getMessage());
}catch(IOException ioe){
System.err.println("IOException: " + ioe.getMessage());
}
}else{
saveDocumentAs();
}
}
public void saveDocumentAs(){
try{
File current = new File(".");
JFileChooser chooser = new JFileChooser(current);
chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
int approval = chooser.showSaveDialog(this);
if (approval == JFileChooser.APPROVE_OPTION){
currentFile = chooser.getSelectedFile();
setTitle(currentFile.getName());
FileOutputStream fos = new FileOutputStream(currentFile);
ObjectOutput oos = new ObjectOutputStream(fos);
oos.writeObject(textPane.getDocument());
oos.flush();
fos.close();
}
}catch(FileNotFoundException fnfe){
System.err.println("FileNotFoundException: " + fnfe.getMessage());
}catch(IOException ioe){
System.err.println("IOException: " + ioe.getMessage());
}
}
public void exit(){
if (JOptionPane.showConfirmDialog(this,
"Are you sure you want to exit?") == JOptionPane.YES_OPTION) System.exit(0);
}
public void clear(){
startNewDocument();
}
public void selectAll(){
textPane.selectAll();
}
public void help(){
JOptionPane.showMessageDialog(this,"DocumentEditor.java\n" +
"Author: Charles Bell\n" +
"Version: June 29, 2002");
}
public void showShortcuts(){
String shortcuts = "Navigate in | Tab\n" +
"Navigate out | Ctrl+Tab\n" +
"Navigate out backwards | Shift+Ctrl+Tab\n" +
"Move up/down a line | Up/Down Arrown\n" +
"Move left/right a component or char | Left/Right Arrow\n" +
"Move up/down one vertical block | PgUp/PgDn\n" +
"Move to start/end of line | Home/End\n" +
"Move to previous/next word | Ctrl+Left/Right Arrow\n" +
"Move to start/end of data | Ctrl+Home/End\n" +
"Move left/right one block | Ctrl+PgUp/PgDn\n" +
"Select All | Ctrl+A\n" +
"Extend selection up one line | Shift+Up Arrow\n" +
"Extend selection down one line | Shift+Down Arrow\n" +
"Extend selection to beginning of line | Shift+Home\n" +
"Extend selection to end of line | Shift+End\n" +
"Extend selection to beginning of data | Ctrl+Shift+Home\n" +
"Extend selection to end of data | Ctrl+Shift+End\n" +
"Extend selection left | Shift+Right Arrow\n" +
"Extend selection right | Shift+Right Arrow\n" +
"Extend selection up one vertical block | Shift+PgUp\n" +
"Extend selection down one vertical block | Shift+PgDn\n" +
"Extend selection left one block | Ctrl+Shift+PgUp\n" +
"Extend selection right one block | Ctrl+Shift+PgDn\n" +
"Extend selection left one word | Ctrl+Shift+Left Arrow\n" +
"Extend selection right one word | Ctrl+Shift+Right Arrow\n";
JOptionPane.showMessageDialog(this,shortcuts);
}
class FrameListener extends WindowAdapter{
public void windowClosing(WindowEvent we){
exit();
}
}
}
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