Java examples for Swing:JTextArea
Create Highlighter for text area
/*/*from w ww.j a v a2s . co m*/ * TextFieldDemo.java requires one additional file: * content.txt */ import java.awt.Color; import java.awt.event.ActionEvent; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import javax.swing.*; import javax.swing.text.*; import javax.swing.event.*; import javax.swing.GroupLayout.*; public class TextFieldDemo extends JFrame implements DocumentListener { private JTextField entry; private JLabel jLabel1; private JScrollPane jScrollPane1; private JLabel status; private JTextArea textArea; final static Color HILIT_COLOR = Color.LIGHT_GRAY; final static Color ERROR_COLOR = Color.PINK; final static String CANCEL_ACTION = "cancel-search"; final Color entryBg; final Highlighter hilit; final Highlighter.HighlightPainter painter; public TextFieldDemo() { initComponents(); InputStream in = getClass().getResourceAsStream("content.txt"); try { textArea.read(new InputStreamReader(in), null); } catch (IOException e) { e.printStackTrace(); } hilit = new DefaultHighlighter(); painter = new DefaultHighlighter.DefaultHighlightPainter( HILIT_COLOR); textArea.setHighlighter(hilit); entryBg = entry.getBackground(); entry.getDocument().addDocumentListener(this); InputMap im = entry.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW); ActionMap am = entry.getActionMap(); im.put(KeyStroke.getKeyStroke("ESCAPE"), CANCEL_ACTION); am.put(CANCEL_ACTION, new CancelAction()); } /** This method is called from within the constructor to * initialize the form. */ private void initComponents() { entry = new JTextField(); textArea = new JTextArea(); status = new JLabel(); jLabel1 = new JLabel(); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setTitle("TextFieldDemo"); textArea.setColumns(20); textArea.setLineWrap(true); textArea.setRows(5); textArea.setWrapStyleWord(true); textArea.setEditable(false); jScrollPane1 = new JScrollPane(textArea); jLabel1.setText("Enter text to search:"); GroupLayout layout = new GroupLayout(getContentPane()); getContentPane().setLayout(layout); //Create a parallel group for the horizontal axis ParallelGroup hGroup = layout .createParallelGroup(GroupLayout.Alignment.LEADING); //Create a sequential and a parallel groups SequentialGroup h1 = layout.createSequentialGroup(); ParallelGroup h2 = layout .createParallelGroup(GroupLayout.Alignment.TRAILING); //Add a container gap to the sequential group h1 h1.addContainerGap(); //Add a scroll pane and a label to the parallel group h2 h2.addComponent(jScrollPane1, GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 450, Short.MAX_VALUE); h2.addComponent(status, GroupLayout.Alignment.LEADING, GroupLayout.DEFAULT_SIZE, 450, Short.MAX_VALUE); //Create a sequential group h3 SequentialGroup h3 = layout.createSequentialGroup(); h3.addComponent(jLabel1); h3.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED); h3.addComponent(entry, GroupLayout.DEFAULT_SIZE, 321, Short.MAX_VALUE); //Add the group h3 to the group h2 h2.addGroup(h3); //Add the group h2 to the group h1 h1.addGroup(h2); h1.addContainerGap(); //Add the group h1 to the hGroup hGroup.addGroup(GroupLayout.Alignment.TRAILING, h1); //Create the horizontal group layout.setHorizontalGroup(hGroup); //Create a parallel group for the vertical axis ParallelGroup vGroup = layout .createParallelGroup(GroupLayout.Alignment.LEADING); //Create a sequential group v1 SequentialGroup v1 = layout.createSequentialGroup(); //Add a container gap to the sequential group v1 v1.addContainerGap(); //Create a parallel group v2 ParallelGroup v2 = layout .createParallelGroup(GroupLayout.Alignment.BASELINE); v2.addComponent(jLabel1); v2.addComponent(entry, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE); //Add the group v2 tp the group v1 v1.addGroup(v2); v1.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED); v1.addComponent(jScrollPane1, GroupLayout.DEFAULT_SIZE, 233, Short.MAX_VALUE); v1.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED); v1.addComponent(status); v1.addContainerGap(); //Add the group v1 to the group vGroup vGroup.addGroup(v1); //Create the vertical group layout.setVerticalGroup(vGroup); pack(); } public void search() { hilit.removeAllHighlights(); String s = entry.getText(); if (s.length() <= 0) { message("Nothing to search"); return; } String content = textArea.getText(); int index = content.indexOf(s, 0); if (index >= 0) { // match found try { int end = index + s.length(); hilit.addHighlight(index, end, painter); textArea.setCaretPosition(end); entry.setBackground(entryBg); message("'" + s + "' found. Press ESC to end search"); } catch (BadLocationException e) { e.printStackTrace(); } } else { entry.setBackground(ERROR_COLOR); message("'" + s + "' not found. Press ESC to start a new search"); } } void message(String msg) { status.setText(msg); } // DocumentListener methods public void insertUpdate(DocumentEvent ev) { search(); } public void removeUpdate(DocumentEvent ev) { search(); } public void changedUpdate(DocumentEvent ev) { } class CancelAction extends AbstractAction { public void actionPerformed(ActionEvent ev) { hilit.removeAllHighlights(); entry.setText(""); entry.setBackground(entryBg); } } public static void main(String args[]) { //Schedule a job for the event dispatch thread: //creating and showing this application's GUI. SwingUtilities.invokeLater(new Runnable() { public void run() { //Turn off metal's use of bold fonts UIManager.put("swing.boldMetal", Boolean.FALSE); new TextFieldDemo().setVisible(true); } }); } } /* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Oracle or the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */