pvbemu/src/desktop/app/Window.java

package app;

// Java imports
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.*;

// Project imports
import util.*;

// Main application window
class Window extends JFrame {

    // Instance fields
    private App     app;     // Containing application
    private int     number;  // Window number within application
    private boolean only;    // This is the only application window
    private File    romFile; // Currently loaded ROM file

    // UI components
    private File   pwd;   // Most recent working directory
    private JPanel video; // Video output



    ///////////////////////////////////////////////////////////////////////////
    //                               Constants                               //
    ///////////////////////////////////////////////////////////////////////////

    // Application icon
    private static final BufferedImage APPICON;

    // Static initializer
    static {
        APPICON = Util.imageRead("images/app_icon.png");
    }



    ///////////////////////////////////////////////////////////////////////////
    //                             Constructors                              //
    ///////////////////////////////////////////////////////////////////////////

    // Default constructor
    Window(App app) {
        super();

        // Configure instance fields
        this.app = app;

        // Configure video pane
        video = new JPanel() {
            public void paintComponent(Graphics g) {
                super.paintComponent(g);
                onPaintVideo((Graphics2D) g, getWidth(), getHeight());
            }
        };
        video.setPreferredSize(new Dimension(384, 224));

        // Configure window
        addWindowListener(Util.onClose(e->onClose()));
        setContentPane(video);
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
        setIconImage(APPICON);
        setJMenuBar(initMenus());
        app.getLocalizer().add(this, "app.title.default");

        // Display window
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }



    ///////////////////////////////////////////////////////////////////////////
    //                           Menu Constructors                           //
    ///////////////////////////////////////////////////////////////////////////

    // Produce the window's menu bar
    private JMenuBar initMenus() {
        var bar = new JMenuBar();
        var loc = app.getLocalizer();
        bar.setBorder(null);
        bar.add(initMenuFile(loc));
        return bar;
    }

    // Initialize the File menu
    private JMenu initMenuFile(Localizer loc) {
        var mnuFile = new JMenu();
        loc.add(mnuFile, "app.file.(menu)");

        var mnuFileLoadRom = new JMenuItem();
        loc.add(mnuFileLoadRom, "app.file.load_rom");
        mnuFileLoadRom.addActionListener(e->onLoadROM());
        mnuFile.add(mnuFileLoadRom);

        mnuFile.addSeparator();

        var mnuFileNewWindow = new JMenuItem();
        loc.add(mnuFileNewWindow, "app.file.new_window");
        mnuFileNewWindow.addActionListener(e->onNewWindow());
        mnuFile.add(mnuFileNewWindow);

        var mnuFileExit = new JMenuItem();
        loc.add(mnuFileExit, "app.file.exit");
        mnuFileExit.addActionListener(e->onClose());
        mnuFile.add(mnuFileExit);

        return mnuFile;
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Package Methods                            //
    ///////////////////////////////////////////////////////////////////////////

    // A window has been added to or removed from the program state
    void windowsChanged(int number, boolean only) {
        this.number = number;
        this.only   = only;
        app.getLocalizer().put(this, "ctrl.number", "" + number);
        updateTitle();
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Event Handlers                             //
    ///////////////////////////////////////////////////////////////////////////

    // Window close, File -> Exit
    private void onClose() {
        app.removeWindow(this);
        dispose();
    }

    // File -> Load ROM
    private void onLoadROM() {
        var loc = app.getLocalizer();

        // Prompt the user to select a file
        var dlgFile = new JFileChooser(pwd);
        dlgFile.addChoosableFileFilter(new FileNameExtensionFilter(
            "Virtual Boy ROMs (*.vb)", "vb"));
        dlgFile.addChoosableFileFilter(new FileNameExtensionFilter(
            "ISX modules (*.isx)", "isx"));
        dlgFile.setAcceptAllFileFilterUsed(true);
        dlgFile.setDialogTitle(loc.get("dialog.load_rom"));
        int option = dlgFile.showDialog(this, loc.get("dialog.load"));

        // The user did not select a file
        var file = dlgFile.getSelectedFile();
        if (option != JFileChooser.APPROVE_OPTION || file == null)
            return;

        // Update the current directory
        pwd = file.getParentFile();

        // Attempt to load the ROM file
        var data = Util.fileRead(file);
        if (data == null) {
            JOptionPane.showMessageDialog(this,
                loc.get("dialog.load_rom_error"),
                loc.get("dialog.load_rom"),
                JOptionPane.ERROR_MESSAGE
            );
            return;
        }

        // Update the emulation state
        romFile = file;
        loc.put(this, "ctrl.filename", file.getName());
        updateTitle();
    }

    // File -> New window
    private void onNewWindow() {
        app.addWindow();
    }

    // Video paint
    private void onPaintVideo(Graphics2D g, int width, int height) {
        int scale = Math.max(1, Math.min(width / 384, height / 224));

        g.translate(
            Math.max(0, (width  - scale * 384) / 2),
            Math.max(0, (height - scale * 224) / 2)
        );
        g.scale(scale, scale);

        g.setColor(Color.black);
        g.fillRect(0, 0, 384, 224);
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Private Methods                            //
    ///////////////////////////////////////////////////////////////////////////

    // Update the window title
    private void updateTitle() {
        app.getLocalizer().add(this,
            only ? romFile != null ?
                "app.title.rom" :
                "app.title.default"
            : romFile != null ?
                "app.title.mixed" :
                "app.title.number"
        );
    }

}