gui.zip_Java-GUI

/* * Copyright (c) 2000 David Flanagan. All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2. */ package com.davidflanagan.examples.gui; import java.awt.*; // LayoutManager stuff import javax.swing.*; // Swing components import java.awt.event.*; // AWT event handlers import javax.swing.event.*; // Swing event handlers import java.beans.*; // JavaBeans event handlers import java.awt.print.*; // Printing functionality import java.io.*; // Input/output import java.net.*; // Networking with URLs import java.util.*; // Hashtables and other utilities // Import this class by name. JFileChooser uses it, and its name conflicts // with java.io.FileFilter import javax.swing.filechooser.FileFilter; // Import a class for printing Swing documents. See printing chapter. import com.davidflanagan.examples.print.PrintableDocument; /** * This class implements a simple web browser using the HTML * display capabilities of the JEditorPane component. **/ public class WebBrowser extends JFrame implements HyperlinkListener, PropertyChangeListener { /** * A simple main() method that allows the WebBrowser class to be used * as a stand-alone application. **/ public static void main(String[] args) throws IOException { // End the program when there are no more open browser windows WebBrowser.setExitWhenLastWindowClosed(true); WebBrowser browser = new WebBrowser(); // Create a browser window browser.setSize(800, 600); // Set its size browser.setVisible(true); // Make it visible. // Tell the browser what to display. This method is defined below. browser.displayPage((args.length > 0) ? args[0] : browser.getHome()); } // This class uses GUIResourceBundle to create its menubar and toolbar // This static initializer performs one-time registration of the // required ResourceParser classes. static { GUIResourceBundle.registerResourceParser(new MenuBarParser()); GUIResourceBundle.registerResourceParser(new MenuParser()); GUIResourceBundle.registerResourceParser(new ActionParser()); GUIResourceBundle.registerResourceParser(new CommandParser()); GUIResourceBundle.registerResourceParser(new ToolBarParser()); } // These are the Swing components that the browser uses JEditorPane textPane; // Where the HTML is displayed JLabel messageLine; // Displays one-line messages JTextField urlField; // Displays and edits the current URL JFileChooser fileChooser; // Allows the user to select a local file // These are Actions that are used in the menubar and toolbar. // We obtain explicit references to them from the GUIResourceBundle // so we can enable and disable them. Action backAction, forwardAction; // These fields are used to maintain the browsing history of the window java.util.List history = new ArrayList(); // The history list int currentHistoryPage = -1; // Current location in it public static final int MAX_HISTORY = 50; // Trim list when over this size // These static fields control the behavior of the close() action static int numBrowserWindows = 0; static boolean exitWhenLastWindowClosed = false; // This is where the "home()" method takes us. See also setHome() String home = "http://www.davidflanagan.com"; // A default value /** Create and initialize a new WebBrowser window */ public WebBrowser() { super(); // Chain to JFrame constructor textPane = new JEditorPane(); // Create HTML window textPane.setEditable(false); // Don't allow the user to edit it // Register action listeners. The first is to handle hyperlinks. // The second is to receive property change notifications, which tell // us when a document is done loading. This class implements these // EventListener interfaces, and the methods are defined below textPane.addHyperlinkListener(this); textPane.addPropertyChangeListener(this); // Put the text pane in a JScrollPane in the center of the window this.getContentPane().add(new JScrollPane(textPane), BorderLayout.CENTER); // Now create a message line and place it at the bottom of the window messageLine = new JLabel(" "); this.getContentPane().add(messageLine, BorderLayout.SOUTH); // Read the file WebBrowserResources.properties (and any localized // variants appropriate for the current Locale) to create a // GUIResourceBundle from which we'll get our menubar and toolbar. GUIResourceBundle resources = new GUIResourceBundle(this,"com.davidflanagan.examples.gui." + "WebBrowserResources"); // Read a menubar from the resource bundle and display it JMenuBar menubar = (JMenuBar) resources.getResource("menubar", JMenuBar.class); this.setJMenuBar(menubar); // Read a toolbar from the resource bundle. Don't display it yet. JToolBar toolbar = (JToolBar) resources.getResource("toolbar", JToolBar.class); // Create a text field that the user can enter a URL in. // Set up an action listener to respond to the ENTER key in that field urlField = new JTextField(); urlField.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { displayPage(urlField.getText()); } }); // Add the URL field and a label for it to the end of the toolbar toolbar.add(new JLabel(" URL:")); toolbar.add(urlField); // And add the toolbar to the top of the window this.getContentPane().add(toolbar, BorderLayout.NORTH); // Read cached copies of two Action objects from the resource bundle // These actions are used by the menubar and toolbar, and enabling and // disabling them enables and disables the menu and toolbar items. backAction = (Action)resources.getResource("action.back",Action.class); forwardAction = (Action)resources.getResource("action.forward", Action.class); // Start off with both actions disabled backAction.setEnabled(false); forwardAction.setEnabled(false); // Create a ThemeManager for this frame, // and add a Theme menu to the menubar ThemeManager themes = new ThemeManager(this, resources); menubar.add(themes.getThemeMenu()); // Keep track of how many web browser windows are open WebBrowser.numBrowserWindows++; } /** Set the static property that controls the behavior of close() */ public static void setExitWhenLastWindowClosed(boolean b) { exitWhenLastWindowClosed = b; } /** These are accessor methods for the home property. */ public void setHome(String home) { this.home = home; } public String getHome() { return home; } /** * This internal method attempts to load and display the specified URL. * It is called from various places throughout the class. **/ boolean visit(URL url) { try { String href = url.toString(); // Start animating. Animation is stopped in propertyChanged() startAnimation("Loading " + href + "..."); textPane.setPage(url); // Load and display the URL this.setTitle(href); // Display URL in window titlebar urlField.setText(href); // Display URL in text input field return true; // Return success } catch (IOException ex) { // If page loading fails stopAnimation(); messageLine.setText("Can't load page: " + ex.getMessage()); return false; // Return failure } } /** * Ask the browser to display the specified URL, and put it in the * history li