pdfviewer.java

Java生成PDF Java生成PDF Java生成PDF

// $Id: PDFViewer.java,v 1.89 2007/05/21 15:02:19 mike Exp $

package org.faceless.pdf2.viewer;

import org.faceless.pdf2.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.filechooser.FileFilter;

/**
 * The <code>PDFViewer</code> class is a simple Swing PDF viewer application.
 * It demonstrates the {@link PDFScrollPane} class, and can be run directly
 * from the JAR (via the {@link PDFTool} class) like so.
 * <pre>
 * java -jar bfopdf.jar <i>filename</i>
 * </pre>
 * The <i>filename</i> argument is optional, but if supplied will load the
 * specified PDF.
 *
 * <p><i>
 * This code is copyright the Big Faceless Organization. You're welcome to
 * use, modify and distribute it in any form in your own projects, provided
 * those projects continue to make use of the Big Faceless PDF library.
 * </i></p>
 *
 * @since 2.5
 */
public class PDFViewer extends JPanel
{
    private static final int INITWIDTH = 400;
    private static final int INITHEIGHT = 200;
    private static final String[] percentage = {"12.5%", "25%", "50%", "75%", "100%", "125%", "150%",
                                           "200%", "400%", "800%", "1600%", "2400%", "3200%", "6400%"};

    static final ImageIcon BFO16 = new ImageIcon(PDFViewer.class.getResource("resources/BFO16.png"));

    // Components
    private JDesktopPane desktop;
    private JComboBox cboZoom;
    private JButton filePrintButton;
    private JMenuItem mCascade;
    private JMenuItem mTiff;
    private JPanel toolbarPanel;

    // Other bits
    private final JFrame parent;
    private int frameCounter = 0;
    private PDFDocumentFrame activeFrame;
    private JFileChooser chooser;

    /**
     * Creates new PDFViewer
     */
    PDFViewer(JFrame frame) {
        parent = frame;
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) { }

        setPreferredSize(new Dimension(500, 500));

        JPanel toolbarPanel = new javax.swing.JPanel();
        toolbarPanel.setBorder(BorderFactory.createEtchedBorder());
        JToolBar fileToolbar = new javax.swing.JToolBar();
        fileToolbar.setLayout(new FlowLayout(FlowLayout.LEFT, 3, 0));
        fileToolbar.setBorder(BorderFactory.createEmptyBorder());

        JButton fileOpenButton = new javax.swing.JButton("Open");
        fileOpenButton.setToolTipText("Open File...");
        filePrintButton = new javax.swing.JButton("Print");
        filePrintButton.setToolTipText("Print...");
        filePrintButton.setEnabled(false);

        JMenuBar mbPdf = new JMenuBar();
        JMenu mFile = new JMenu();
        JMenu mWindow = new JMenu();
        mCascade = new JMenuItem();
        mCascade.setEnabled(false);
        JMenu mTools = new JMenu();
        mTiff = new JMenuItem();
        mTiff.setEnabled(false);

        setLayout(new BorderLayout());
        toolbarPanel.setLayout(new java.awt.FlowLayout(java.awt.FlowLayout.LEFT, 0, 0));

        fileOpenButton.setPreferredSize(new Dimension(62, 32));
        fileOpenButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                loadPDF(null);
            }
        });
        fileToolbar.add(fileOpenButton);

        filePrintButton.setPreferredSize(new Dimension(62, 32));
        filePrintButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                activeFrame.print();
            }
        });
        fileToolbar.add(filePrintButton);

        cboZoom = new javax.swing.JComboBox(percentage);
        if (System.getProperty("os.name").toLowerCase().startsWith("mac os x")) {
            cboZoom.setFont(cboZoom.getFont().deriveFont(Font.PLAIN, 10));
        }
        cboZoom.setEnabled(false);
        cboZoom.setSelectedIndex(4);
        cboZoom.setPreferredSize(new Dimension(68, 32));
        cboZoom.setEditable(true);
        cboZoom.setToolTipText("Zoom Tool");
        cboZoom.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                final JComboBox cb = (JComboBox) evt.getSource();
                if (cb.getSelectedItem()!=null) {
                    activeFrame.setPercent((String)cb.getSelectedItem());
                }
            }
        });

        fileToolbar.add(cboZoom);
        toolbarPanel.add(fileToolbar);
        add(toolbarPanel, BorderLayout.NORTH);

        // add desktop pane
        desktop = new JDesktopPane();
        desktop.setBackground(Color.gray);
        add(desktop,BorderLayout.CENTER);

        mbPdf.setDoubleBuffered(true);
        mFile.setText("File");
        JMenuItem mFileOpen = new JMenuItem();
        mFileOpen.setText("Open");
        mFileOpen.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                loadPDF(null);
            }
        });
        mFile.add(mFileOpen);
        JMenuItem mFileQuit = new JMenuItem();
        mFileQuit.setText("Quit");
        mFileQuit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                System.exit(0);
            }
        });
        mFile.add(mFileQuit);
        mbPdf.add(mFile);

        mTools.setText("Tools");
        mTiff.setText("PDF -> TIFF");
        mTiff.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                PDFViewport vp = activeFrame.getViewPort();
                TiffDialog tiff = new TiffDialog(parent, vp, true);
            }
        });
        mTools.add(mTiff);
        mbPdf.add(mTools);

        mWindow.setText("Window");
        mCascade.setText("Cascade");
        mCascade.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                cascadeFrames();
            }
        });
        mWindow.add(mCascade);

        JMenuItem mAbout = new JMenuItem();
        mAbout.setText("About");
        mAbout.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JOptionPane.showInternalMessageDialog(desktop, "Big Faceless PDF Library Viewer\nVersion "+PDF.VERSION+"\n\njava -jar bfopdf.jar --help for more options", "About", JOptionPane.INFORMATION_MESSAGE);
            }
        });
        mWindow.add(mAbout);
        mbPdf.add(mWindow);

        parent.setJMenuBar(mbPdf);
        setVisible(true);

        new Thread() {
            public void run() {
                chooser = new JFileChooser((File)null);
                chooser.setFileFilter(new FileFilter() {
                    public boolean accept(File f) {
                        return f.isDirectory() || f.getName().toLowerCase().endsWith(".pdf");
                    }
                    public String getDescription() {
                        return "PDF files (*.pdf)";
                    }
                });
            }
        }.start();
    }

    /**
     * Load a PDF into the viewer from a file.
     * @param file the PDF file to load, or <code>null</code> to select it with a chooser
     * @since 2.7.1
     */
    public void loadPDF(File file) {
        loadPDF(file, null);
    }

    /**
     * Load a PDF into the viewer from a file. If a password is specified it will be used
     * to open the file (if it's null or incorrect, the user will be prompted).
     * @param file the PDF file to load, or <code>null</code> to select it with a chooser
     * @param password the password to use to open the file - may be <code>null</code>.
     * @since 2.7.1
     */
    public void loadPDF(File file, final String password) {
        if (file == null) {
            int returnVal = chooser.showOpenDialog(parent);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                repaint();
                file = chooser.getSelectedFile();
            }
        }

        if (file!=null) {
            final File ffile = file;
            javax.swing.SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    try {
                        PDFReader reader = null;
                        try {
                            reader = new PDFReader(ffile, password);
                        } catch (PasswordException pwd) {
                            PasswordDialog login = new PasswordDialog(parent,ffile);
                            repaint();
                            if (login.isValidPassword()) {
                                reader = login.getReader();
                            }
                        }
                        if (reader!=null) {
                            addDocumentFrame(new PDF(reader), ffile.getName());
                        }
                    } catch (Exception e) {
                        activeFrameChanged();
                        ErrorInfo.displayThrowable(e, "Open Document Error", parent);
                    }
                }
            });
        }
    }

    /**
     * Load a pre-loaded PDF into the viewer.
     * @param pdf the PDF to load
     * @param name the name of the PDF, to display in the title bar.
     * @since 2.7.1
     */
    public void loadPDF(final PDF pdf, final String name) {
        if (pdf!=null) {
            javax.swing.SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    addDocumentFrame(pdf, name==null ? pdf.getInfo("Title") : name);
                }
            });
        }
    }

    private void addDocumentFrame(PDF pdf, String name) {
        PDFDocumentFrame frame = new PDFDocumentFrame();
        frame.setFrameIcon(BFO16);
        frame.setBounds(frameCounter*30, frameCounter*20, INITWIDTH, INITHEIGHT);
        frameCounter = (frameCounter+1) % 10;
        frame.addInternalFrameListener(frame. new FrameListener());
        try {
            // minimise other frames
            JInternalFrame[] fs = desktop.getAllFrames();
            for (int i=0;i<fs.length;i++) fs[i].setMaximum(false);
            // add new frame
            desktop.add(frame);
            frame.show();
            frame.setMaximum(true);
        } catch (java.beans.PropertyVetoException e) { }
        frame.setTitle(name);
        frame.setDocument(pdf);
    }

    private void activeFrameChanged() {
        activeFrame = (PDFDocumentFrame)desktop.getSelectedFrame();
        mCascade.setEnabled(activeFrame != null);
        mTiff.setEnabled(activeFrame != null);
        if(activeFrame != null) {
            cboZoom.setSelectedItem(activeFrame.getPercent());
        }
        cboZoom.setEnabled(activeFrame != null);
        filePrintButton.setEnabled(activeFrame != null);
    }

    private void cascadeFrames() {
        try {
            JInternalFrame[] frames = desktop.getAllFrames();
            JInternalFrame selectedFrame = desktop.getSelectedFrame();
            int x = 0;
            int y = 0;
            for (int k=frames.length-1; k>=0; k--) {
                frames[k].setMaximum(false);
                frames[k].setIcon(false);
                frames[k].setBounds(x, y, INITWIDTH, INITHEIGHT);