drawapplication.java

开源（Open Source）项目JHotDraw的文档和源程序

/*
 * @(#)DrawApplication.java 5.2
 *
 */

package CH.ifa.draw.application;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import CH.ifa.draw.framework.*;
import CH.ifa.draw.standard.*;
import CH.ifa.draw.figures.*;
import CH.ifa.draw.util.*;

/**
 * DrawApplication defines a standard presentation for
 * standalone drawing editors. The presentation is
 * customized in subclasses.
 * The application is started as follows:
 * <pre>
 * public static void main(String[] args) {
 *     MayDrawApp window = new MyDrawApp();
 *     window.open();
 * }
 * </pre>
 */

public  class DrawApplication
        extends JFrame
        implements DrawingEditor, PaletteListener {

    private Drawing              fDrawing;
    private Tool                 fTool;
    private Iconkit              fIconkit;

    private JTextField           fStatusLine;
    private StandardDrawingView  fView;
    private ToolButton           fDefaultToolButton;
    private ToolButton           fSelectedToolButton;

    private String               fApplicationName;
    private String               fDrawingFilename;
    private StorageFormatManager fStorageFormatManager;
    static String                fgUntitled = "untitled";

    // the image resource path
    private static final String fgDrawPath = "/CH/ifa/draw/";
    public static final String IMAGES = fgDrawPath + "images/";

    /**
     * The index of the file menu in the menu bar.
     */
    public static final int    FILE_MENU = 0;
    /**
     * The index of the edit menu in the menu bar.
     */
    public static final int    EDIT_MENU = 1;
    /**
     * The index of the alignment menu in the menu bar.
     */
    public static final int    ALIGNMENT_MENU = 2;
    /**
     * The index of the attributes menu in the menu bar.
     */
    public static final int    ATTRIBUTES_MENU = 3;


    /**
     * Constructs a drawing window with a default title.
     */
    public DrawApplication() {
        super("JHotDraw");
    }

    /**
     * Constructs a drawing window with the given title.
     */
    public DrawApplication(String title) {
        super(title);
        setApplicationName(title);
    }

    /**
     * Factory method which can be overriden by subclasses to
     * create an instance of their type.
     *
     * @return	newly created application
     */
	protected DrawApplication createApplication() {
		return new DrawApplication();
	}
	
    /**
     * Open a new view for this application containing a
     * view of the drawing of the currently activated window.
     */
    public void newView() {
		DrawApplication window = createApplication();
		window.open();
		window.setDrawing(drawing());
		window.setDrawingTitle(getDrawingTitle() + " (View)");
    }

    /**
     * Open a new window for this application containing
     * an new (empty) drawing.
     */
    public void newWindow() {
		DrawApplication window = createApplication();
		window.open();
    }
    
    /**
     * Opens the window and initializes its contents.
     * Clients usually only call but don't override it.
     */
    public void open() {
        fIconkit = new Iconkit(this);
		getContentPane().setLayout(new BorderLayout());
		// Panel in which a JToolBar can be placed using a BoxLayout
        JPanel fullPanel = new JPanel();
        fullPanel.setLayout(new BoxLayout(fullPanel, BoxLayout.X_AXIS));
        fView = createDrawingView();
        JComponent contents = createContents((StandardDrawingView)view());
        contents.setAlignmentX(LEFT_ALIGNMENT);

        JToolBar tools = createToolPalette();
        createTools(tools);

        JPanel activePanel = new JPanel();
        activePanel.setAlignmentX(LEFT_ALIGNMENT);
	    activePanel.setAlignmentY(TOP_ALIGNMENT);
        activePanel.setLayout(new BorderLayout());
        activePanel.add(tools, BorderLayout.NORTH);
        activePanel.add(contents, BorderLayout.CENTER);

        fullPanel.add(activePanel);

        fStatusLine = createStatusLine();
        getContentPane().add(fullPanel, BorderLayout.CENTER);
        getContentPane().add(fStatusLine, BorderLayout.SOUTH);

		JMenuBar mb = new JMenuBar();
		createMenus(mb);
		setJMenuBar(mb);
		
        initDrawing();
        
        Dimension d = defaultSize();
        if (d.width > mb.getPreferredSize().width) {
    		setSize(d.width, d.height);
		}
		else {
            setSize(mb.getPreferredSize().width, d.height);
		}
        addListeners();
        setVisible(true);
        fStorageFormatManager = createStorageFormatManager();
    }

    /**
     * Registers the listeners for this window
     */
	protected void addListeners() {
	    addWindowListener(
            new WindowAdapter() {
                public void windowClosing(WindowEvent event) {
                    exit();
                }
            }
        );
    }

    protected void initDrawing() {
        setDrawing(createDrawing());
        setDrawingTitle(fgUntitled);
        view().setDrawing(drawing());
        toolDone();
    }

    /**
     * Creates the standard menus. Clients override this
     * method to add additional menus.
     */
    protected void createMenus(JMenuBar mb) {
		mb.add(createFileMenu());
		mb.add(createEditMenu());
		mb.add(createAlignmentMenu());
		mb.add(createAttributesMenu());
		mb.add(createDebugMenu());
    }

    /**
     * Creates the file menu. Clients override this
     * method to add additional menu items.
     */
    protected JMenu createFileMenu() {
		JMenu menu = new JMenu("File");
		JMenuItem mi = new JMenuItem("New", new MenuShortcut('n').getKey());
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            promptNew();
		        }
		    }
		);
		menu.add(mi);

		mi = new JMenuItem("Open...", new MenuShortcut('o').getKey());
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            promptOpen();
		        }
		    }
		);
		menu.add(mi);

		mi = new JMenuItem("Save As...", new MenuShortcut('s').getKey());
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            promptSaveAs();
		        }
		    }
		);
		menu.add(mi);

		menu.addSeparator();
		mi = new JMenuItem("Print...", new MenuShortcut('p').getKey());
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            print();
		        }
		    }
		);
		menu.add(mi);
		menu.addSeparator();
		mi = new JMenuItem("Exit");
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            exit();
		        }
		    }
		);
		menu.add(mi);
		return menu;
	}

    /**
     * Creates the edit menu. Clients override this
     * method to add additional menu items.
     */
    protected JMenu createEditMenu() {
		CommandMenu menu = new CommandMenu("Edit");
		menu.add(new CutCommand("Cut", view()), new MenuShortcut('x'));
		menu.add(new CopyCommand("Copy", view()), new MenuShortcut('c'));
		menu.add(new PasteCommand("Paste", view()), new MenuShortcut('v'));
		menu.addSeparator();
		menu.add(new DuplicateCommand("Duplicate", view()), new MenuShortcut('d'));
		menu.add(new DeleteCommand("Delete", view()));
		menu.addSeparator();
		menu.add(new GroupCommand("Group", view()));
		menu.add(new UngroupCommand("Ungroup", view()));
		menu.addSeparator();
		menu.add(new SendToBackCommand("Send to Back", view()));
		menu.add(new BringToFrontCommand("Bring to Front", view()));
		return menu;
	}

    /**
     * Creates the alignment menu. Clients override this
     * method to add additional menu items.
     */
    protected JMenu createAlignmentMenu() {
		CommandMenu menu = new CommandMenu("Align");
		menu.add(new ToggleGridCommand("Toggle Snap to Grid", view(), new Point(4,4)));
		menu.addSeparator();
		menu.add(new AlignCommand("Lefts", view(), AlignCommand.LEFTS));
		menu.add(new AlignCommand("Centers", view(), AlignCommand.CENTERS));
		menu.add(new AlignCommand("Rights", view(), AlignCommand.RIGHTS));
		menu.addSeparator();
		menu.add(new AlignCommand("Tops", view(), AlignCommand.TOPS));
		menu.add(new AlignCommand("Middles", view(), AlignCommand.MIDDLES));
		menu.add(new AlignCommand("Bottoms", view(), AlignCommand.BOTTOMS));
		return menu;
	}

    /**
     * Creates the debug menu. Clients override this
     * method to add additional menu items.
     */
    protected JMenu createDebugMenu() {
		JMenu menu = new JMenu("Debug");

		JMenuItem mi = new JMenuItem("Simple Update");
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            view().setDisplayUpdate(new SimpleUpdateStrategy());
		        }
		    }
		);
		menu.add(mi);

		mi = new JMenuItem("Buffered Update");
		mi.addActionListener(
		    new ActionListener() {
		        public void actionPerformed(ActionEvent event) {
		            view().setDisplayUpdate(new BufferedUpdateStrategy());
		        }
		    }
		);
		menu.add(mi);
		return menu;
	}

    /**
     * Creates the attributes menu and its submenus. Clients override this
     * method to add additional menu items.
     */
    protected JMenu createAttributesMenu() {
        JMenu menu = new JMenu("Attributes");
        menu.add(createColorMenu("Fill Color", "FillColor"));
        menu.add(createColorMenu("Pen Color", "FrameColor"));
        menu.add(createArrowMenu());
		menu.addSeparator();
        menu.add(createFontMenu());
        menu.add(createFontSizeMenu());
        menu.add(createFontStyleMenu());
        menu.add(createColorMenu("Text Color", "TextColor"));
        return menu;
    }

    /**
     * Creates the color menu.
     */
    protected JMenu createColorMenu(String title, String attribute) {
        CommandMenu menu = new CommandMenu(title);
        for (int i=0; i<ColorMap.size(); i++)
            menu.add(
                new ChangeAttributeCommand(
                    ColorMap.name(i),
                    attribute,
                    ColorMap.color(i),
                    view()
                )
            );
        return menu;
    }

    /**
     * Creates the arrows menu.
     */
    protected JMenu createArrowMenu() {
        CommandMenu menu = new CommandMenu("Arrow");
        menu.add(new ChangeAttributeCommand("none",     "ArrowMode", new Integer(PolyLineFigure.ARROW_TIP_NONE),  view()));
        menu.add(new ChangeAttributeCommand("at Start", "ArrowMode", new Integer(PolyLineFigure.ARROW_TIP_START), view()));
        menu.add(new ChangeAttributeCommand("at End",   "ArrowMode", new Integer(PolyLineFigure.ARROW_TIP_END),   view()));
        menu.add(new ChangeAttributeCommand("at Both",  "ArrowMode", new Integer(PolyLineFigure.ARROW_TIP_BOTH),  view()));
        return menu;
    }

    /**
     * Creates the fonts menus. It installs all available fonts
     * supported by the toolkit implementation.
     */
    protected JMenu createFontMenu() {
        CommandMenu menu = new CommandMenu("Font");
        String fonts[] = Toolkit.getDefaultToolkit().getFontList();
        for (int i = 0; i < fonts.length; i++)
            menu.add(new ChangeAttributeCommand(fonts[i], "FontName", fonts[i],  view()));
        return menu;
    }

    /**
     * Creates the font style menu with entries (Plain, Italic, Bold).
     */
    protected JMenu createFontStyleMenu() {
        CommandMenu menu = new CommandMenu("Font Style");
        menu.add(new ChangeAttributeCommand("Plain", "FontStyle", new Integer(Font.PLAIN), view()));
        menu.add(new ChangeAttributeCommand("Italic","FontStyle", new Integer(Font.ITALIC),view()));
        menu.add(new ChangeAttributeCommand("Bold",  "FontStyle", new Integer(Font.BOLD),  view()));
        return menu;
    }

    /**
     * Creates the font size menu.
     */
    protected JMenu createFontSizeMenu() {
        CommandMenu menu = new CommandMenu("Font Size");
        int sizes[] = { 9, 10, 12, 14, 18, 24, 36, 48, 72 };
        for (int i = 0; i < sizes.length; i++) {
            menu.add(
                new ChangeAttributeCommand(
                    Integer.toString(sizes[i]),
                    "FontSize",
                    new Integer(sizes[i]),  view())
                );
        }
        return menu;
    }

	/**
	 * Create a menu which allows the user to select a different look and feel at runtime.
	 */
    public JMenu createLookAndFeelMenu() {
        JMenu menu = new JMenu("Look'n'Feel");

        UIManager.LookAndFeelInfo[] lafs = UIManager.getInstalledLookAndFeels();
        JMenuItem mi = null;

		for (int i = 0; i < lafs.length; i++) {
            mi = new JMenuItem(lafs[i].getName());
            final String lnfClassName = lafs[i].getClassName();