textbatchprintingdemo.java

java tutorial.sun公司官方出品。java入门书籍。最新版

                URL page = item.getPage();
                if (! page.equals(pageItem.getPage())) {
                    setPage(page);
                }
            }
        }
    }

    /**
     * Load URL into the current page item.  If the cached page item exists for
     * the given URL, use it; otherwise create new page item.
     */
    void setPage(URL url) {
        PageItem item = pageCache.get(url);
        if (item == null) {
            item = createPageItem(url);
            pageCache.put(url, item);
        }
        if (pageItem != null) {
            Container p = pageItem.getParent();
            if (p != null) {
                p.remove(pageItem);
                p.add(item);
            }
        }
        pageItem = item;
        updateSelectedPages();
    }

    /**
     * Synchronize the selection in the print list with the current page item.
     * If the current page item isn't in the print list, clear selection.
     */
    void updateSelectedPages() {
        ListModel pages = selectedPages.getModel();
        int n = pages.getSize();
        if (n > 0) {
            URL page = pageItem.getPage();
            int index = selectedPages.getSelectedIndex();
            if (index >= 0) {
                PageItem selected = (PageItem) pages.getElementAt(index);
                if (page.equals(selected.getPage())) {
                    // Currently displayed page is selected in the print list.
                    return;
                }
            }
            for (int i = 0; i < n; i++) {
                PageItem pi = (PageItem) pages.getElementAt(i);
                if (page.equals(pi.getPage())) {
                    // Currently displayed page is in the print list, select it.
                    selectedPages.setSelectedIndex(i);
                    return;
                }
            }
            // Currently displayed page is not in the print list. 
            selectedPages.clearSelection();
        }
    }


    /* Part 3: Initialization and setup.  */
    
    /**
     * Create and return a page item initialized with the given URL.
     */
    PageItem createPageItem(URL url) {
        PageItem item = new PageItem();
        item.setPreferredSize(new Dimension(800, 600));
        item.setEditable(false);
        item.addHyperlinkListener(this);
        try {
            item.setPage(url);
        } catch (IOException ioe) {
            messageArea.setText("Error loading " + url + ": " + ioe);
        }
        return item;
    }

    /**
     * Create and return a menu item with the specified action, mnemonics and
     * keyboad accelerator.
     */
    JMenuItem createMenuItem(Action action, int mnemonics, KeyStroke accel) {
        JMenuItem item = new JMenuItem(action);
        item.setMnemonic(mnemonics);
        item.setAccelerator(accel);
        return item;
    }

    
    /**
     * Create and display the main application frame.
     */
    void createAndShowGUI() {
        messageArea = new JLabel(defaultMessage);
        
        selectedPages = new JList(new DefaultListModel());
        selectedPages.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        selectedPages.addListSelectionListener(this);
        
        setPage(homePage);
        
        JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
                new JScrollPane(pageItem), new JScrollPane(selectedPages));
        
        JMenu fileMenu = new JMenu("File");
        fileMenu.setMnemonic(KeyEvent.VK_F);

        /** Menu item and keyboard shortcuts for the "add page" command.  */
        fileMenu.add(createMenuItem(
                new AbstractAction("Add Page") {
                    public void actionPerformed(ActionEvent e) {
                        DefaultListModel pages =
                                (DefaultListModel) selectedPages.getModel();
                        pages.addElement(pageItem);
                        selectedPages.setSelectedIndex(pages.getSize() - 1);
                   }
                },
                KeyEvent.VK_A, 
                KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.ALT_MASK)));

        /** Menu item and keyboard shortcuts for the "print selected" command.*/
        fileMenu.add(createMenuItem(
                new AbstractAction("Print Selected") {
                    public void actionPerformed(ActionEvent e) {
                        printSelectedPages();
                    }
                },
                KeyEvent.VK_P, 
                KeyStroke.getKeyStroke(KeyEvent.VK_P, ActionEvent.ALT_MASK)));


        /** Menu item and keyboard shortcuts for the "clear selected" command.*/
        fileMenu.add(createMenuItem(
                new AbstractAction("Clear Selected") {
                    public void actionPerformed(ActionEvent e) {
                        DefaultListModel pages =
                                (DefaultListModel) selectedPages.getModel();
                        pages.removeAllElements();
                    }
                },
                KeyEvent.VK_C, 
                KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.ALT_MASK)));

        fileMenu.addSeparator();

        /** Menu item and keyboard shortcuts for the "home page" command.  */
        fileMenu.add(createMenuItem(
                new AbstractAction("Home Page") {
                    public void actionPerformed(ActionEvent e) {
                        setPage(homePage);
                    }
                },
                KeyEvent.VK_H, 
                KeyStroke.getKeyStroke(KeyEvent.VK_H, ActionEvent.ALT_MASK)));

	/** Menu item and keyboard shortcuts for the "quit" command.  */
        fileMenu.add(createMenuItem(
                new AbstractAction("Quit") {
                    public void actionPerformed(ActionEvent e) {
                        for (Window w : Window.getWindows()) {
                            w.dispose();
                        }
                    }
                },
                KeyEvent.VK_A, 
                KeyStroke.getKeyStroke(KeyEvent.VK_Q, ActionEvent.ALT_MASK)));

        JMenuBar menuBar = new JMenuBar();
        menuBar.add(fileMenu);
        
        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
        contentPane.add(pane);
        contentPane.add(messageArea);

        JFrame frame = new JFrame("Text Batch Printing Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setJMenuBar(menuBar);
        frame.setContentPane(contentPane);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

        if (printService == null) {
            // Actual printing is not possible, issue a warning message.
            JOptionPane.showMessageDialog(frame, "No default print service",
                            "Print Service Alert", JOptionPane.WARNING_MESSAGE);
        }
    }

    public static void main(String[] args) {
        final TextBatchPrintingDemo demo = new TextBatchPrintingDemo();

        demo.homePage = demo.getClass().getResource(defaultPage);
        // Custom home page can be specified on the command line.
        if (args.length > 0) {
            String pageName = args[0];
            try {
                URL url = new URL(pageName);
                demo.homePage = url;
            } catch (MalformedURLException e) {
                System.out.println("Error parsing " + pageName + ": " + e);
                // Home page is unchanged from the default value.
            }
        }


        //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);
                demo.createAndShowGUI();
            }
        });
    }
}