Example usage for javax.swing JTextArea JTextArea

Introduction

In this page you can find the example usage for javax.swing JTextArea JTextArea.

Prototype

public JTextArea() 

Source Link

Document

Constructs a new TextArea.

Usage

From source file:JTextAreaBackgroundSample.java

public static void main(String args[]) {
    JFrame frame = new JFrame("Background Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    final ImageIcon imageIcon = new ImageIcon("yourFile.gif");
    JTextArea textArea = new JTextArea() {
        Image image = imageIcon.getImage();

        Image grayImage = GrayFilter.createDisabledImage(image);
        {//ww  w  . j  av  a  2  s . c  o m
            setOpaque(false);
        }

        public void paint(Graphics g) {
            g.drawImage(grayImage, 0, 0, this);
            super.paint(g);
        }
    };
    JScrollPane scrollPane = new JScrollPane(textArea);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(250, 250);
    frame.setVisible(true);
}

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From source file:Main.java

public static void main(String args[]) {
    JFrame frame = new JFrame("Background Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    final ImageIcon imageIcon = new ImageIcon("draft.gif");
    JTextArea textArea = new JTextArea() {
        Image image = imageIcon.getImage();

        Image grayImage = GrayFilter.createDisabledImage(image);
        {//w ww  .  j  a  v  a 2  s.c om
            setOpaque(false);
        }

        public void paint(Graphics g) {
            g.drawImage(grayImage, 0, 0, this);
            super.paint(g);
        }
    };
    JScrollPane scrollPane = new JScrollPane(textArea);
    Container content = frame.getContentPane();
    content.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(250, 250);
    frame.setVisible(true);
}

---

From source file:Main.java

public static void main(String args[]) {
    JFrame frame = new JFrame("Use TextAction");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    final JTextArea leftArea = new JTextArea();
    final JTextArea rightArea = new JTextArea();

    JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, new JScrollPane(leftArea),
            new JScrollPane(rightArea));
    splitPane.setDividerLocation(.5);/*w w w  .  jav  a 2s  .c  om*/

    JMenuBar menuBar = new JMenuBar();
    frame.setJMenuBar(menuBar);
    JMenu menu = new JMenu("Options");
    menuBar.add(menu);
    JMenuItem menuItem;

    Action readAction = leftArea.getActionMap().get(DefaultEditorKit.readOnlyAction);
    menuItem = menu.add(readAction);
    menuItem.setText("Make read-only");
    Action writeAction = leftArea.getActionMap().get(DefaultEditorKit.writableAction);
    menuItem = menu.add(writeAction);
    menuItem.setText("Make writable");
    menu.addSeparator();

    Action cutAction = leftArea.getActionMap().get(DefaultEditorKit.cutAction);
    menuItem = menu.add(cutAction);
    menuItem.setText("Cut");
    Action copyAction = leftArea.getActionMap().get(DefaultEditorKit.copyAction);
    menuItem = menu.add(copyAction);
    menuItem.setText("Copy");
    Action pasteAction = leftArea.getActionMap().get(DefaultEditorKit.pasteAction);
    menuItem = menu.add(pasteAction);
    menuItem.setText("Paste");

    frame.add(splitPane, BorderLayout.CENTER);
    frame.setSize(400, 250);
    frame.setVisible(true);

}

---

From source file:Main.java

public static void main(String[] argv) {

    JTextComponent textcomp = new JTextArea();
    final UndoManager undo = new UndoManager();
    Document doc = textcomp.getDocument();

    doc.addUndoableEditListener(new UndoableEditListener() {
        public void undoableEditHappened(UndoableEditEvent evt) {
            undo.addEdit(evt.getEdit());
        }/* w w w.jav a 2s.com*/
    });

    textcomp.getActionMap().put("Undo", new AbstractAction("Undo") {
        public void actionPerformed(ActionEvent evt) {
            try {
                if (undo.canUndo()) {
                    undo.undo();
                }
            } catch (CannotUndoException e) {
            }
        }
    });

    textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(new JScrollPane(textcomp));
    frame.setSize(380, 320);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}

---

From source file:Main.java

public static void main(String[] argv) throws Exception {
    JTextComponent textcomp = new JTextArea();
    final UndoManager undo = new UndoManager();
    Document doc = textcomp.getDocument();

    doc.addUndoableEditListener(new UndoableEditListener() {
        public void undoableEditHappened(UndoableEditEvent evt) {
            undo.addEdit(evt.getEdit());
        }//from   ww  w  .  j av a2  s.c o m
    });
    textcomp.getActionMap().put("Undo", new AbstractAction("Undo") {
        public void actionPerformed(ActionEvent evt) {
            try {
                if (undo.canUndo()) {
                    undo.undo();
                }
            } catch (CannotUndoException e) {
            }
        }
    });
    textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Z"), "Undo");
    textcomp.getActionMap().put("Redo", new AbstractAction("Redo") {
        public void actionPerformed(ActionEvent evt) {
            try {
                if (undo.canRedo()) {
                    undo.redo();
                }
            } catch (CannotRedoException e) {
            }
        }
    });
    textcomp.getInputMap().put(KeyStroke.getKeyStroke("control Y"), "Redo");
}

---

From source file:ElementSample.java

public static void main(String args[]) {
    JFrame frame = new JFrame("Element Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    final JTextArea textArea = new JTextArea();
    JScrollPane scrollPane = new JScrollPane(textArea);

    JButton button = new JButton("Show Elements");
    ActionListener actionListener = new ActionListener() {
        public void actionPerformed(ActionEvent actionEvent) {
            Document document = textArea.getDocument();
            ElementIterator iterator = new ElementIterator(document);
            Element element = iterator.first();
            while (element != null) {
                System.out.println(element.getStartOffset());
                element = iterator.next();
            }//from  www . j  a v  a2s .  c om
        }
    };
    button.addActionListener(actionListener);

    frame.add(scrollPane, BorderLayout.CENTER);
    frame.add(button, BorderLayout.SOUTH);

    frame.setSize(250, 250);
    frame.setVisible(true);
}

---

From source file:MainClass.java

public static void main(final String args[]) {
    JFrame frame = new JFrame("Element Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    final JTextArea textArea = new JTextArea();
    JScrollPane scrollPane = new JScrollPane(textArea);

    JButton button = new JButton("Show Elements");
    ActionListener actionListener = new ActionListener() {
        public void actionPerformed(ActionEvent actionEvent) {
            Document document = textArea.getDocument();
            ElementIterator iterator = new ElementIterator(document);
            Element element = iterator.first();
            while (element != null) {
                System.out.println(element.getStartOffset());
                element = iterator.next();
            }/*  w  ww . ja  v a 2 s  .  co  m*/
        }
    };
    button.addActionListener(actionListener);

    frame.add(scrollPane, BorderLayout.CENTER);
    frame.add(button, BorderLayout.SOUTH);

    frame.setSize(250, 250);
    frame.setVisible(true);

}

---

From source file:ElementSample.java

public static void main(String args[]) {
    JFrame frame = new JFrame("Element Example");
    Container content = frame.getContentPane();

    final JTextArea textArea = new JTextArea();
    JScrollPane scrollPane = new JScrollPane(textArea);

    JButton button = new JButton("Show Elements");
    ActionListener actionListener = new ActionListener() {
        public void actionPerformed(ActionEvent actionEvent) {
            Document document = textArea.getDocument();
            ElementIterator iterator = new ElementIterator(document);
            Element element = iterator.first();
            while (element != null) {
                System.out.println(element.getStartOffset());
                element = iterator.next();
            }/*from   ww  w . ja v  a  2 s  .c  om*/
        }
    };
    button.addActionListener(actionListener);

    content.add(scrollPane, BorderLayout.CENTER);
    content.add(button, BorderLayout.SOUTH);

    frame.setSize(250, 250);
    frame.setVisible(true);
}

---

From source file:CaretSample.java

public static void main(String args[]) {
    JFrame frame = new JFrame("Caret Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = frame.getContentPane();
    JTextArea textArea = new JTextArea();
    JScrollPane scrollPane = new JScrollPane(textArea);
    content.add(scrollPane, BorderLayout.CENTER);

    final JTextField dot = new JTextField();
    dot.setEditable(false);/*from w w w.j  av a 2s .c o m*/
    JPanel dotPanel = new JPanel(new BorderLayout());
    dotPanel.add(new JLabel("Dot: "), BorderLayout.WEST);
    dotPanel.add(dot, BorderLayout.CENTER);
    content.add(dotPanel, BorderLayout.NORTH);

    final JTextField mark = new JTextField();
    mark.setEditable(false);
    JPanel markPanel = new JPanel(new BorderLayout());
    markPanel.add(new JLabel("Mark: "), BorderLayout.WEST);
    markPanel.add(mark, BorderLayout.CENTER);
    content.add(markPanel, BorderLayout.SOUTH);

    CaretListener listener = new CaretListener() {
        public void caretUpdate(CaretEvent caretEvent) {
            dot.setText("" + caretEvent.getDot());
            mark.setText("" + caretEvent.getMark());
        }
    };

    textArea.addCaretListener(listener);

    frame.setSize(250, 150);
    frame.setVisible(true);
}

---

From source file:Main.java

public static void main(String[] args) {
    JPanel topPanel = new JPanel();
    topPanel.setPreferredSize(new Dimension(200, 200));
    topPanel.setBackground(Color.WHITE);

    JTextArea chatArea = new JTextArea();
    JScrollPane scrollPane = new JScrollPane(chatArea);

    JPanel mainPanel = new JPanel(new BorderLayout(5, 5));
    mainPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
    mainPanel.add(topPanel, BorderLayout.CENTER);
    mainPanel.add(scrollPane, BorderLayout.SOUTH);

    chatArea.getDocument().addDocumentListener(new DocumentListener() {

        @Override//from w  w  w  .j  a  v a  2s .  co m
        public void insertUpdate(DocumentEvent e) {
            updateLineCount();
        }

        @Override
        public void removeUpdate(DocumentEvent e) {
            updateLineCount();
        }

        @Override
        public void changedUpdate(DocumentEvent e) {
            updateLineCount();
        }

        private void updateLineCount() {
            int lineCount = chatArea.getLineCount();
            if (lineCount <= 4) {
                chatArea.setRows(lineCount);
                mainPanel.revalidate();
            }
        }
    });

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(mainPanel);
    f.pack();
    f.setVisible(true);
}

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