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package example;
import com.artifex.mupdf.fitz.*;
import java.io.File;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Button;
import java.awt.Panel;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.WindowListener;
import java.awt.event.WindowEvent;
import java.awt.event.ActionEvent;
import java.awt.GraphicsEnvironment;
import java.awt.GraphicsDevice;
import java.awt.Toolkit;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import javax.swing.JOptionPane;
import java.lang.reflect.Field;
public class Viewer extends Frame implements WindowListener, ActionListener
{
protected Document doc;
protected Panel toolbar;
protected PageCanvas pageCanvas;
protected Label pageLabel;
protected Button firstButton, prevButton, nextButton, lastButton, zoomInButton, zoomOutButton;
protected int pageCount;
protected int pageNumber;
private float retinaScale;
public Viewer(Document doc_) {
super("MuPDF");
retinaScale = getRetinaScale();
this.doc = doc_;
pageCount = doc.countPages();
pageNumber = 0;
setSize(1200, 900);
setTitle("MuPDF: " + doc.getMetaData(Document.META_INFO_TITLE));
toolbar = new Panel();
toolbar.setLayout(new FlowLayout(FlowLayout.LEFT));
firstButton = new Button("|<");
firstButton.addActionListener(this);
prevButton = new Button("<");
prevButton.addActionListener(this);
nextButton = new Button(">");
nextButton.addActionListener(this);
lastButton = new Button(">|");
lastButton.addActionListener(this);
zoomInButton = new Button("+");
zoomInButton.addActionListener(this);
zoomOutButton = new Button("-");
zoomOutButton.addActionListener(this);
pageLabel = new Label();
toolbar.add(firstButton);
toolbar.add(prevButton);
toolbar.add(nextButton);
toolbar.add(lastButton);
toolbar.add(zoomInButton);
toolbar.add(zoomOutButton);
toolbar.add(pageLabel);
add(toolbar, BorderLayout.NORTH);
addWindowListener(this);
stuff();
}
public void stuff() {
pageLabel.setText("Page " + (pageNumber + 1) + " / " + pageCount);
if (pageCanvas != null)
remove(pageCanvas);
pageCanvas = new PageCanvas(doc.loadPage(pageNumber), retinaScale);
add(pageCanvas, BorderLayout.CENTER);
validate();
}
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
int oldPageNumber = pageNumber;
if (source == firstButton)
pageNumber = 0;
if (source == lastButton)
pageNumber = pageCount - 1;
if (source == prevButton) {
pageNumber = pageNumber - 1;
if (pageNumber < 0)
pageNumber = 0;
}
if (source == nextButton) {
pageNumber = pageNumber + 1;
if (pageNumber >= pageCount)
pageNumber = pageCount - 1;
}
if (source == zoomInButton) {
pageCanvas.zoomIn();
}
if (source == zoomOutButton) {
pageCanvas.zoomOut();
}
if (pageNumber != oldPageNumber)
stuff();
}
public void windowClosing(WindowEvent event) {
System.exit(0);
}
public void windowActivated(WindowEvent event) { }
public void windowDeactivated(WindowEvent event) { }
public void windowIconified(WindowEvent event) { }
public void windowDeiconified(WindowEvent event) { }
public void windowOpened(WindowEvent event) { }
public void windowClosed(WindowEvent event) { }
public static void main(String[] args)
{
JFileChooser fileChooser = new JFileChooser();
fileChooser.setDialogTitle("Choose a file to open");
fileChooser.setFileFilter(new FileFilter()
{
public String getDescription()
{
return "Supported files (*.pdf, *,xps, *.jpg, *.jpeg, *.png, *.epub, *.cbz, *.cbr)";
}
public boolean accept(File f)
{
if (f.isDirectory())
return true;
String filename = f.getName().toLowerCase();
if (filename.endsWith(".pdf"))
return true;
if (filename.endsWith(".xps"))
return true;
if (filename.endsWith(".jpg"))
return true;
if (filename.endsWith(".jpeg"))
return true;
if (filename.endsWith(".png"))
return true;
if (filename.endsWith(".epub"))
return true;
if (filename.endsWith(".cbz"))
return true;
if (filename.endsWith(".cbr"))
return true;
return false;
}
});
while (true)
{
try
{
// get a file to open
int result = fileChooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION)
{
// user selects a file
File selectedFile = fileChooser.getSelectedFile();
if (selectedFile != null)
{
Document doc = new Document(selectedFile.getAbsolutePath());
if (doc != null)
{
Viewer app = new Viewer(doc);
if (app != null)
{
app.setVisible(true);
return;
}
else
{
infoBox("Cannot create Viewer for "+selectedFile.getAbsolutePath(),"Error");
}
}
else
{
infoBox("Cannot open "+selectedFile.getAbsolutePath(),"Error");
}
}
else
{
infoBox("Selected file not found.","Error");
}
}
else
{
infoBox("File selection cancelled.","Error");
return;
}
}
catch (Exception e)
{
infoBox("Exception: "+e.getMessage(),"Error");
}
}
}
private static void infoBox(String infoMessage, String titleBar)
{
JOptionPane.showMessageDialog(null, infoMessage, "InfoBox: " + titleBar, JOptionPane.INFORMATION_MESSAGE);
}
public float getRetinaScale()
{
// first try Oracle's VM (we should also test for 1.7.0_40 or higher)
final String vendor = System.getProperty("java.vm.vendor");
boolean isOracle = vendor != null && vendor.toLowerCase().contains("Oracle".toLowerCase());
if (isOracle)
{
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
final GraphicsDevice device = env.getDefaultScreenDevice();
try {
Field field = device.getClass().getDeclaredField("scale");
if (field != null) {
field.setAccessible(true);
Object scale = field.get(device);
if (scale instanceof Integer && ((Integer)scale).intValue() == 2) {
return 2.0f;
}
}
}
catch (Exception ignore) {
}
return 1.0f;
}
// try Apple VM
final Float scaleFactor = (Float)Toolkit.getDefaultToolkit().getDesktopProperty("apple.awt.contentScaleFactor");
if (scaleFactor != null && scaleFactor.intValue() == 2) {
return 2.0f;
}
return 1.0f;
}
}
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