Java tutorial
/* * 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. */ package components; /* * TextSamplerDemo.java requires the following files: * TextSamplerDemoHelp.html (which references images/dukeWaveRed.gif) * images/Pig.gif * images/sound.gif */ import javax.swing.*; import javax.swing.text.*; import java.awt.*; //for layout managers and more import java.awt.event.*; //for action events import java.net.URL; import java.io.IOException; public class TextSamplerDemo extends JPanel implements ActionListener { private String newline = "\n"; protected static final String textFieldString = "JTextField"; protected static final String passwordFieldString = "JPasswordField"; protected static final String ftfString = "JFormattedTextField"; protected static final String buttonString = "JButton"; protected JLabel actionLabel; public TextSamplerDemo() { setLayout(new BorderLayout()); //Create a regular text field. JTextField textField = new JTextField(10); textField.setActionCommand(textFieldString); textField.addActionListener(this); //Create a password field. JPasswordField passwordField = new JPasswordField(10); passwordField.setActionCommand(passwordFieldString); passwordField.addActionListener(this); //Create a formatted text field. JFormattedTextField ftf = new JFormattedTextField(java.util.Calendar.getInstance().getTime()); ftf.setActionCommand(textFieldString); ftf.addActionListener(this); //Create some labels for the fields. JLabel textFieldLabel = new JLabel(textFieldString + ": "); textFieldLabel.setLabelFor(textField); JLabel passwordFieldLabel = new JLabel(passwordFieldString + ": "); passwordFieldLabel.setLabelFor(passwordField); JLabel ftfLabel = new JLabel(ftfString + ": "); ftfLabel.setLabelFor(ftf); //Create a label to put messages during an action event. actionLabel = new JLabel("Type text in a field and press Enter."); actionLabel.setBorder(BorderFactory.createEmptyBorder(10, 0, 0, 0)); //Lay out the text controls and the labels. JPanel textControlsPane = new JPanel(); GridBagLayout gridbag = new GridBagLayout(); GridBagConstraints c = new GridBagConstraints(); textControlsPane.setLayout(gridbag); JLabel[] labels = { textFieldLabel, passwordFieldLabel, ftfLabel }; JTextField[] textFields = { textField, passwordField, ftf }; addLabelTextRows(labels, textFields, gridbag, textControlsPane); c.gridwidth = GridBagConstraints.REMAINDER; //last c.anchor = GridBagConstraints.WEST; c.weightx = 1.0; textControlsPane.add(actionLabel, c); textControlsPane.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("Text Fields"), BorderFactory.createEmptyBorder(5, 5, 5, 5))); //Create a text area. JTextArea textArea = new JTextArea("This is an editable JTextArea. " + "A text area is a \"plain\" text component, " + "which means that although it can display text " + "in any font, all of the text is in the same font."); textArea.setFont(new Font("Serif", Font.ITALIC, 16)); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); JScrollPane areaScrollPane = new JScrollPane(textArea); areaScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); areaScrollPane.setPreferredSize(new Dimension(250, 250)); areaScrollPane.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("Plain Text"), BorderFactory.createEmptyBorder(5, 5, 5, 5)), areaScrollPane.getBorder())); //Create an editor pane. JEditorPane editorPane = createEditorPane(); JScrollPane editorScrollPane = new JScrollPane(editorPane); editorScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); editorScrollPane.setPreferredSize(new Dimension(250, 145)); editorScrollPane.setMinimumSize(new Dimension(10, 10)); //Create a text pane. JTextPane textPane = createTextPane(); JScrollPane paneScrollPane = new JScrollPane(textPane); paneScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); paneScrollPane.setPreferredSize(new Dimension(250, 155)); paneScrollPane.setMinimumSize(new Dimension(10, 10)); //Put the editor pane and the text pane in a split pane. JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, editorScrollPane, paneScrollPane); splitPane.setOneTouchExpandable(true); splitPane.setResizeWeight(0.5); JPanel rightPane = new JPanel(new GridLayout(1, 0)); rightPane.add(splitPane); rightPane.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("Styled Text"), BorderFactory.createEmptyBorder(5, 5, 5, 5))); //Put everything together. JPanel leftPane = new JPanel(new BorderLayout()); leftPane.add(textControlsPane, BorderLayout.PAGE_START); leftPane.add(areaScrollPane, BorderLayout.CENTER); add(leftPane, BorderLayout.LINE_START); add(rightPane, BorderLayout.LINE_END); } private void addLabelTextRows(JLabel[] labels, JTextField[] textFields, GridBagLayout gridbag, Container container) { GridBagConstraints c = new GridBagConstraints(); c.anchor = GridBagConstraints.EAST; int numLabels = labels.length; for (int i = 0; i < numLabels; i++) { c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last c.fill = GridBagConstraints.NONE; //reset to default c.weightx = 0.0; //reset to default container.add(labels[i], c); c.gridwidth = GridBagConstraints.REMAINDER; //end row c.fill = GridBagConstraints.HORIZONTAL; c.weightx = 1.0; container.add(textFields[i], c); } } public void actionPerformed(ActionEvent e) { String prefix = "You typed \""; if (textFieldString.equals(e.getActionCommand())) { JTextField source = (JTextField) e.getSource(); actionLabel.setText(prefix + source.getText() + "\""); } else if (passwordFieldString.equals(e.getActionCommand())) { JPasswordField source = (JPasswordField) e.getSource(); actionLabel.setText(prefix + new String(source.getPassword()) + "\""); } else if (buttonString.equals(e.getActionCommand())) { Toolkit.getDefaultToolkit().beep(); } } private JEditorPane createEditorPane() { JEditorPane editorPane = new JEditorPane(); editorPane.setEditable(false); java.net.URL helpURL = TextSamplerDemo.class.getResource("TextSamplerDemoHelp.html"); if (helpURL != null) { try { editorPane.setPage(helpURL); } catch (IOException e) { System.err.println("Attempted to read a bad URL: " + helpURL); } } else { System.err.println("Couldn't find file: TextSampleDemoHelp.html"); } return editorPane; } private JTextPane createTextPane() { String[] initString = { "This is an editable JTextPane, ", //regular "another ", //italic "styled ", //bold "text ", //small "component, ", //large "which supports embedded components..." + newline, //regular " " + newline, //button "...and embedded icons..." + newline, //regular " ", //icon newline + "JTextPane is a subclass of JEditorPane that " + "uses a StyledEditorKit and StyledDocument, and provides " + "cover methods for interacting with those objects." }; String[] initStyles = { "regular", "italic", "bold", "small", "large", "regular", "button", "regular", "icon", "regular" }; JTextPane textPane = new JTextPane(); StyledDocument doc = textPane.getStyledDocument(); addStylesToDocument(doc); try { for (int i = 0; i < initString.length; i++) { doc.insertString(doc.getLength(), initString[i], doc.getStyle(initStyles[i])); } } catch (BadLocationException ble) { System.err.println("Couldn't insert initial text into text pane."); } return textPane; } protected void addStylesToDocument(StyledDocument doc) { //Initialize some styles. Style def = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE); Style regular = doc.addStyle("regular", def); StyleConstants.setFontFamily(def, "SansSerif"); Style s = doc.addStyle("italic", regular); StyleConstants.setItalic(s, true); s = doc.addStyle("bold", regular); StyleConstants.setBold(s, true); s = doc.addStyle("small", regular); StyleConstants.setFontSize(s, 10); s = doc.addStyle("large", regular); StyleConstants.setFontSize(s, 16); s = doc.addStyle("icon", regular); StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER); ImageIcon pigIcon = createImageIcon("images/Pig.gif", "a cute pig"); if (pigIcon != null) { StyleConstants.setIcon(s, pigIcon); } s = doc.addStyle("button", regular); StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER); ImageIcon soundIcon = createImageIcon("images/sound.gif", "sound icon"); JButton button = new JButton(); if (soundIcon != null) { button.setIcon(soundIcon); } else { button.setText("BEEP"); } button.setCursor(Cursor.getDefaultCursor()); button.setMargin(new Insets(0, 0, 0, 0)); button.setActionCommand(buttonString); button.addActionListener(this); StyleConstants.setComponent(s, button); } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path, String description) { java.net.URL imgURL = TextSamplerDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL, description); } else { System.err.println("Couldn't find file: " + path); return null; } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event dispatch thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("TextSamplerDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add content to the window. frame.add(new TextSamplerDemo()); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event dispatching 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); createAndShowGUI(); } }); } }