Java by API/javax.swing.text/Document
Содержание
- 1 Document: addDocumentListener(DocumentListener listener)
- 2 Document: addUndoableEditListener(UndoableEditListener listener)
- 3 Document: dump(PrintStream out)
- 4 Document: getDefaultRootElement()
- 5 Document: getLength()
- 6 Document: getText(int offset, int length)
- 7 Document: insertString(int offset, String str, AttributeSet a)
- 8 Document: remove(int offs, int len)
Document: addDocumentListener(DocumentListener listener)
<source lang="java">
import javax.swing.JButton; import javax.swing.JTextField; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.Document; public class Main {
JButton button = new JButton("foo");
JTextField textfield = new JTextField(10);
Document document;
public Main() {
document = textfield.getDocument();
document.addDocumentListener(new JButtonStateController());
}
class JButtonStateController implements DocumentListener {
JButtonStateController() {
}
public void changedUpdate(DocumentEvent e) {
disableIfEmpty(e);
}
public void insertUpdate(DocumentEvent e) {
disableIfEmpty(e);
}
public void removeUpdate(DocumentEvent e) {
disableIfEmpty(e);
}
public void disableIfEmpty(DocumentEvent e) {
button.setEnabled(e.getDocument().getLength() > 0);
}
}
}
</source>
Document: addUndoableEditListener(UndoableEditListener listener)
<source lang="java">
import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JTextPane; import javax.swing.event.UndoableEditEvent; import javax.swing.event.UndoableEditListener; import javax.swing.undo.UndoableEdit; public class UndoStyleFrame extends JFrame {
protected UndoAct undoAction = new UndoAct();
protected RedoAct redoAction = new RedoAct();
public UndoStyleFrame() {
super();
setTitle("UndoStyleFrame");
JTextPane textPane = new JTextPane();
textPane.getDocument().addUndoableEditListener(undoAction);
textPane.getDocument().addUndoableEditListener(redoAction);
JMenu editMenu = new JMenu("Edit");
editMenu.add(new JMenuItem(undoAction));
editMenu.add(new JMenuItem(redoAction));
JMenuBar menuBar = new JMenuBar();
menuBar.add(editMenu);
setJMenuBar(menuBar);
JPanel buttonPanel = new JPanel();
buttonPanel.add(new JButton(undoAction));
buttonPanel.add(new JButton(redoAction));
getContentPane().add(textPane, "Center");
getContentPane().add(buttonPanel, "South");
}
public class UndoAct extends AbstractAction implements UndoableEditListener {
private UndoableEdit edit;
public UndoAct() {
super("Undo");
setEnabled(false);
}
public void updateEnabled() {
setEnabled(edit.canUndo());
}
public void undoableEditHappened(UndoableEditEvent event) {
edit = event.getEdit();
putValue(NAME, edit.getUndoPresentationName());
updateEnabled();
}
public void actionPerformed(ActionEvent ae) {
edit.undo();
updateEnabled();
redoAction.updateEnabled();
}
}
public class RedoAct extends AbstractAction implements UndoableEditListener {
private UndoableEdit edit;
public RedoAct() {
super("Redo");
setEnabled(false);
}
public void updateEnabled() {
setEnabled(edit.canRedo());
}
public void undoableEditHappened(UndoableEditEvent event) {
edit = event.getEdit();
putValue(NAME, edit.getRedoPresentationName());
updateEnabled();
}
public void actionPerformed(ActionEvent ae) {
edit.redo();
updateEnabled();
undoAction.updateEnabled();
}
}
public static void main(String[] args) {
JFrame frame = new UndoStyleFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
}
}
</source>
Document: dump(PrintStream out)
<source lang="java">
import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.text.AbstractDocument; public class Main {
public static void main(String[] args) {
JFrame f = new JFrame("Text Field Elements");
JTextField tf = new JTextField(32);
tf.setText("That"s one small step for man...");
f.getContentPane().add(tf);
f.pack();
f.setVisible(true);
((AbstractDocument) tf.getDocument()).dump(System.out);
}
}
</source>
Document: getDefaultRootElement()
<source lang="java">
import javax.swing.JTextArea; import javax.swing.text.Element; public class Main {
public static void main(String[] argv) throws Exception {
JTextArea textArea = new JTextArea("word1 word2\nword3\nword4");
Element paragraph = textArea.getDocument().getDefaultRootElement();
int contentCount = paragraph.getElementCount();
for (int i = 0; i < contentCount; i++) {
Element e = paragraph.getElement(i);
int rangeStart = e.getStartOffset();
int rangeEnd = e.getEndOffset();
String line = textArea.getText(rangeStart, rangeEnd - rangeStart);
System.out.println(line);
}
}
}
</source>
Document: getLength()
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.InputVerifier; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JTextField; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.JTextComponent; public class MainClass {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField nameTextField = new JTextField();
frame.add(nameTextField, BorderLayout.NORTH);
frame.add(new JTextField(), BorderLayout.SOUTH);
DocumentListener documentListener = new DocumentListener() {
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
String typeString = null;
if (type.equals(DocumentEvent.EventType.CHANGE)) {
typeString = "Change";
} else if (type.equals(DocumentEvent.EventType.INSERT)) {
typeString = "Insert";
} else if (type.equals(DocumentEvent.EventType.REMOVE)) {
typeString = "Remove";
}
System.out.print("Type : " + typeString + " / ");
Document source = documentEvent.getDocument();
int length = source.getLength();
try {
System.out.println("Contents: " + source.getText(0, length));
} catch (BadLocationException badLocationException) {
System.out.println("Contents: Unknown");
}
}
};
nameTextField.getDocument().addDocumentListener(documentListener);
frame.setSize(250, 100);
frame.setVisible(true);
}
}
</source>
Document: getText(int offset, int length)
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.InputVerifier; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JTextField; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.JTextComponent; public class MainClass {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField nameTextField = new JTextField();
frame.add(nameTextField, BorderLayout.NORTH);
frame.add(new JTextField(), BorderLayout.SOUTH);
DocumentListener documentListener = new DocumentListener() {
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
String typeString = null;
if (type.equals(DocumentEvent.EventType.CHANGE)) {
typeString = "Change";
} else if (type.equals(DocumentEvent.EventType.INSERT)) {
typeString = "Insert";
} else if (type.equals(DocumentEvent.EventType.REMOVE)) {
typeString = "Remove";
}
System.out.print("Type : " + typeString + " / ");
Document source = documentEvent.getDocument();
int length = source.getLength();
try {
System.out.println("Contents: " + source.getText(0, length));
} catch (BadLocationException badLocationException) {
System.out.println("Contents: Unknown");
}
}
};
nameTextField.getDocument().addDocumentListener(documentListener);
frame.setSize(250, 100);
frame.setVisible(true);
}
}
</source>
Document: insertString(int offset, String str, AttributeSet a)
<source lang="java">
import java.awt.BorderLayout; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTextPane; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultStyledDocument; import javax.swing.text.SimpleAttributeSet; import javax.swing.text.Style; import javax.swing.text.StyleConstants; import javax.swing.text.StyleContext; import javax.swing.text.StyledDocument; public class MainClass {
public static void main(String args[]) throws Exception {
JFrame frame = new JFrame("TextPane Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
StyleContext context = new StyleContext();
StyledDocument document = new DefaultStyledDocument(context);
Style style = context.getStyle(StyleContext.DEFAULT_STYLE);
StyleConstants.setAlignment(style, StyleConstants.ALIGN_RIGHT);
StyleConstants.setFontSize(style, 14);
StyleConstants.setSpaceAbove(style, 4);
StyleConstants.setSpaceBelow(style, 4);
SimpleAttributeSet attributes = new SimpleAttributeSet();
StyleConstants.setBold(attributes, true);
StyleConstants.setItalic(attributes, true);
// Third style for icon/component
Style labelStyle = context.getStyle(StyleContext.DEFAULT_STYLE);
Icon icon = new ImageIcon("Computer.gif");
JLabel label = new JLabel(icon);
StyleConstants.setComponent(labelStyle, label);
try {
document.insertString(document.getLength(), "Hello www.jexp.ru", attributes);
document.insertString(document.getLength(), "Ignored", labelStyle);
} catch (BadLocationException badLocationException) {
System.err.println("Oops");
}
JTextPane textPane = new JTextPane(document);
textPane.setEditable(false);
JScrollPane scrollPane = new JScrollPane(textPane);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 150);
frame.setVisible(true);
}
}
</source>
Document: remove(int offs, int len)
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.InputEvent; import java.awt.event.KeyEvent; import java.util.Hashtable; import javax.swing.Action; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.KeyStroke; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultEditorKit; import javax.swing.text.Document; import javax.swing.text.JTextComponent; import javax.swing.text.Keymap; import javax.swing.text.TextAction; import javax.swing.text.Utilities; public class Main {
public static void main(String[] args) {
JTextArea area = new JTextArea(6, 32);
Keymap parent = area.getKeymap();
Keymap newmap = JTextComponent.addKeymap("KeymapExampleMap", parent);
KeyStroke u = KeyStroke.getKeyStroke(KeyEvent.VK_U,
InputEvent.CTRL_MASK);
Action actionU = new UpWord();
newmap.addActionForKeyStroke(u, actionU);
Action actionList[] = area.getActions();
Hashtable lookup = new Hashtable();
for (int j = 0; j < actionList.length; j += 1)
lookup.put(actionList[j].getValue(Action.NAME), actionList[j]);
KeyStroke L = KeyStroke.getKeyStroke(KeyEvent.VK_L,
InputEvent.CTRL_MASK);
Action actionL = (Action) lookup.get(DefaultEditorKit.selectLineAction);
newmap.addActionForKeyStroke(L, actionL);
KeyStroke W = KeyStroke.getKeyStroke(KeyEvent.VK_W,
InputEvent.CTRL_MASK);
Action actionW = (Action) lookup.get(DefaultEditorKit.selectWordAction);
newmap.addActionForKeyStroke(W, actionW);
area.setKeymap(newmap);
JFrame f = new JFrame("KeymapExample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new JScrollPane(area), BorderLayout.CENTER);
area.setText("This is a test.");
f.pack();
f.setVisible(true);
}
} class UpWord extends TextAction {
public UpWord() {
super("uppercase-word-action");
}
public void actionPerformed(ActionEvent e) {
JTextComponent comp = getTextComponent(e);
if (comp == null)
return;
Document doc = comp.getDocument();
int start = comp.getSelectionStart();
int end = comp.getSelectionEnd();
try {
int left = Utilities.getWordStart(comp, start);
int right = Utilities.getWordEnd(comp, end);
String word = doc.getText(left, right - left);
doc.remove(left, right - left);
doc.insertString(left, word.toUpperCase(), null);
comp.setSelectionStart(start);
comp.setSelectionEnd(end);
} catch (BadLocationException ble) {
return;
}
}
}
</source>
