Java Swing - ComicsViewer

 Java Swing - Comics Viewer

package jlib5.app;

import com.formdev.flatlaf.FlatLightLaf;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.IOException;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import jlib5.java.UnZipApi;
import jlib5.swing.Dock;
import jlib5.swing.Drop;
import jlib5.swing.ImageView;
import jlib5.swing.Swing;
import net.infonode.docking.View;

public final class ComicsViewer {
    boolean useDock = false;
    Dock dock;
    javax.swing.JFrame frame;
    JLabel statusText = new JLabel("Ready");
    String imageTitle = "imageView";
    ImageView imageView;
    UnZipApi images = new UnZipApi();
    int imagesIndex = 0;
    JComboBox pageSelect = Swing.getComboBox(160, this::pageSelectHandler);

    public static void main(String[] args) throws Exception {
        FlatLightLaf.setup();
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new ComicsViewer();
            }
        });
    }

    ComicsViewer() {
        createViews();
        showFrame();
    }
    
    final void createViews() {
        imageView = new ImageView();
        if( useDock ) {
            dock = new Dock();
            View imgview = dock.addToViewMap(imageTitle, null, imageView.getLayout());
            dock.createRootWindow();
            dock.getRootWindow().setWindow(dock.getTab(imgview));
        }
        imageView.getCtrl().setTransferHandler(new Drop(this::fileDropHandler) );
    }
    
    void showFrame() {
        frame = new JFrame("ImageViewer");
        frame.getContentPane().add(createToolBar(), BorderLayout.NORTH);
        if( useDock ) {
            frame.getContentPane().add(dock.getRootWindow(), BorderLayout.CENTER);
        } else {
            frame.getContentPane().add(imageView.getLayout(), BorderLayout.CENTER);
        }
        frame.getContentPane().add(statusText, BorderLayout.SOUTH);
        frame.setJMenuBar(createMenuBar());
        frame.setSize(900, 700);
        frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);  
    }    

   //---------------------------------------------------------------------------
    public void setImage(int index) {
        try {
            if( images != null && index >= 0 && index < images.size() ) {
                imagesIndex = index;
                imageView.setImage(images.unzipEntry(index));
                statusText.setText(" [ " + (index+1) + " / " + images.size() + " ] ");
            }
        } catch (IOException ignore) {
        }
    }
    void gotoPage(int page) { 
        pageSelect.setSelectedIndex(page);
    }
    void firstPage() { gotoPage(0); }
    void lastPage() { if( images != null ) gotoPage(images.size()-1); }
    void prevPage() { gotoPage(imagesIndex-1); }
    void nextPage() { gotoPage(imagesIndex+1); }
    void pageSelectHandler() { setImage(pageSelect.getSelectedIndex()); }
    
    void loadComicsFile(File file) {
        if( file.isFile() ) {
            try {
                images.load(file.getAbsolutePath(), "EUC_KR");
                pageSelect.removeAllItems();
                for( int i = 0; i < images.size(); i++ ) {
                    pageSelect.addItem( "[ " + (i+1) + " ] "+ images.getName(i));
                }                
                firstPage();
            } catch (IOException igonre) {
            }
        }
    }

    boolean fileDropHandler(Object...obj)  {
        java.util.List<File> files = (java.util.List<File>) obj[0];
        loadComicsFile(files.get(0));    
        return true;
    }
    
    void fileOpen() {
        loadComicsFile(fileOpenDialog(frame));
    } 
    
   //---------------------------------------------------------------------------
    public File fileOpenDialog(Frame frame) {
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
        int result = fileChooser.showOpenDialog(frame);
        if (result == JFileChooser.APPROVE_OPTION) {
            return fileChooser.getSelectedFile();
        }
        return null;
    }
    
    JButton getButton(String text, Image image, Runnable handler) {
        JButton button = new JButton();
        if( text    != null ) { button.setText(text); }
        if( image   != null ) { button.setIcon(new ImageIcon(image)); }
        if( handler != null ) { button.addActionListener( (e) -> handler.run() ); }
        return button;
    }  
        
    JToolBar createToolBar() {
        JToolBar toolBar = new JToolBar();
        toolBar.add( getButton("Open",null,this::fileOpen) );
        toolBar.addSeparator();
        toolBar.add( pageSelect );
        toolBar.add( getButton("|<",null, this::firstPage ) );
        toolBar.add( getButton("<",null, this::prevPage ) );
        toolBar.add( getButton(">",null, this::nextPage ) );
        toolBar.add( getButton(">|",null, this::lastPage ) );
        toolBar.addSeparator();
        toolBar.add( getButton("(0)",null,() -> { imageView.updateImage("original"); } ) );
        toolBar.add( getButton("(+)",null,() -> { imageView.updateImage("increase"); } ) );
        toolBar.add( getButton("(-)",null,() -> { imageView.updateImage("decrease"); } ) );
        toolBar.add( getButton("(F)",null,() -> { imageView.updateImage("fit"); } ) );
        toolBar.add( getButton("(W)",null,() -> { imageView.updateImage("width"); } ) );
        toolBar.add( getButton("(H)",null,() -> { imageView.updateImage("height"); } ) );
        return toolBar;
    }    
    
    JMenuBar createMenuBar() {
      JMenuBar menu = new JMenuBar();
      menu.add(createFileMenu());
      return menu;
    }

    JMenu createFileMenu() {
        JMenu menu = new JMenu("File");
        JMenuItem item = new JMenuItem("Exit");
        menu.add(item).addActionListener((ActionEvent e) -> {
            System.exit(0);
        });
        return menu;
    }

}