swingset2.java

实现了对GUM类型的图像的放大缩小漫游的功能

    public JMenuItem createThemesMenuItem(JMenu menu, String label, String mnemonic,
			       String accessibleDescription, DefaultMetalTheme theme) {
        JRadioButtonMenuItem mi = (JRadioButtonMenuItem) menu.add(new JRadioButtonMenuItem(getString(label)));
	themesMenuGroup.add(mi);
	mi.setMnemonic(getMnemonic(mnemonic));
	mi.getAccessibleContext().setAccessibleDescription(getString(accessibleDescription));
	mi.addActionListener(new ChangeThemeAction(this, theme));

	return mi;
    }

    /**
     * Creates a JRadioButtonMenuItem for the Look and Feel menu
     */
    public JMenuItem createLafMenuItem(JMenu menu, String label, String mnemonic,
			       String accessibleDescription, String laf) {
        JMenuItem mi = (JRadioButtonMenuItem) menu.add(new JRadioButtonMenuItem(getString(label)));
	lafMenuGroup.add(mi);
	mi.setMnemonic(getMnemonic(mnemonic));
	mi.getAccessibleContext().setAccessibleDescription(getString(accessibleDescription));
	mi.addActionListener(new ChangeLookAndFeelAction(this, laf));

	mi.setEnabled(isAvailableLookAndFeel(laf));

	return mi;
    }

   
    

    // *******************************************************
    // ****************** Utility Methods ********************
    // *******************************************************

     protected boolean isAvailableLookAndFeel(String laf) {
         try { 
             Class lnfClass = Class.forName(laf);
             LookAndFeel newLAF = (LookAndFeel)(lnfClass.newInstance());
             return newLAF.isSupportedLookAndFeel();
         } catch(Exception e) { // If ANYTHING weird happens, return false
             return false;
         }
     }


   
    public GumViewer getFrame() {
	return frame;
    }

    /**
     * Returns the menubar
     */
    public JMenuBar getMenuBar() {
	return menuBar;
    }



    /**
     * This method returns a string from the demo's resource bundle.
     */
    public String getString(String key) {
	String value = null;
	try {
	    value = getResourceBundle().getString(key);
	} catch (MissingResourceException e) {
	    System.out.println("java.util.MissingResourceException: Couldn't find value for: " + key);
	}
	if(value == null) {
	    value = "Could not find resource: " + key + "  ";
	}
	return value;
    }

    /**
     * Returns the resource bundle associated with this demo. Used
     * to get accessable and internationalized strings.
     */
    public ResourceBundle getResourceBundle() {
	if(bundle == null) {
	    bundle = ResourceBundle.getBundle("resources.swingset");
	}
	return bundle;
    }

    /**
     * Returns a mnemonic from the resource bundle. Typically used as
     * keyboard shortcuts in menu items.
     */
    public char getMnemonic(String key) {
	return (getString(key)).charAt(0);
    }

    /**
     * Creates an icon from an image contained in the "images" directory.
     */
    public ImageIcon createImageIcon(String filename, String description) {
	String path = "/resources/images/" + filename;
	return new ImageIcon(getClass().getResource(path)); 
    }

    /**
     * If DEBUG is defined, prints debug information out to std ouput.
     */
    public void debug(String s) {
	if(DEBUG) {
	    System.out.println((debugCounter++) + ": " + s);
	}
    }

    /**
     * Stores the current L&F, and calls updateLookAndFeel, below
     */
    public void setLookAndFeel(String laf) {
	if(currentLookAndFeel != laf) {
	    currentLookAndFeel = laf;
	    themesMenu.setEnabled(laf == metal);
	    updateLookAndFeel();
	}
    }

    /**
     * Sets the current L&F on each demo module
     */
    public void updateLookAndFeel() {
	try {
	    UIManager.setLookAndFeel(currentLookAndFeel);
	    SwingUtilities.updateComponentTreeUI(this);
	} catch (Exception ex) {
	    System.out.println("Failed loading L&F: " + currentLookAndFeel);
	    System.out.println(ex);
	}

	
	
    }

    
    // *******************************************************
    // ********************   Actions  ***********************
    // *******************************************************
    
   


    class OkAction extends AbstractAction {
	JDialog aboutBox;

        protected OkAction(JDialog aboutBox) {
            super("OkAction");
	    this.aboutBox = aboutBox;
        }

        public void actionPerformed(ActionEvent e) {
	    aboutBox.setVisible(false);
	}
    }


    class ChangeLookAndFeelAction extends AbstractAction {
	SwingSet2 swingset;
	String laf;
        protected ChangeLookAndFeelAction(SwingSet2 swingset, String laf) {
            super("ChangeTheme");
	    this.swingset = swingset;
	    this.laf = laf;
        }

        public void actionPerformed(ActionEvent e) {
	    swingset.setLookAndFeel(laf);
		if(swingset.getFrame().isDragged)
			swingset.getFrame().col_default=swingset.getFrame().btn_selected.getBackground();
		else
			swingset.getFrame().col_default=swingset.getFrame().btn_drag.getBackground();
	}
    }
  class ChangeThemeAction extends AbstractAction {
	SwingSet2 swingset;
	DefaultMetalTheme theme;
        protected ChangeThemeAction(SwingSet2 swingset, DefaultMetalTheme theme) {
            super("ChangeTheme");
	    this.swingset = swingset;
	    this.theme = theme;
		
        }

        public void actionPerformed(ActionEvent e) {
	    MetalLookAndFeel.setCurrentTheme(theme);
	    swingset.updateLookAndFeel();
				if(swingset.getFrame().isDragged)
			swingset.getFrame().col_default=swingset.getFrame().btn_selected.getBackground();
		else
			swingset.getFrame().col_default=swingset.getFrame().btn_drag.getBackground();
		
	}
    }

    class ExitAction extends AbstractAction {
	SwingSet2 swingset;
        protected ExitAction(SwingSet2 swingset) {
            super("ExitAction");
	    this.swingset = swingset;
        }

        public void actionPerformed(ActionEvent e) {
	    System.exit(0);
        }
    }

    class AboutAction extends AbstractAction {
	SwingSet2 swingset;
        protected AboutAction(SwingSet2 swingset) {
            super("AboutAction");
	    this.swingset = swingset;
        }
        public void actionPerformed(ActionEvent e) {
			swingset.showAbout();
    }}

	class FileOpenAction extends AbstractAction {
	SwingSet2 swingset;
        protected FileOpenAction(SwingSet2 swingset) {
            super("FileOpenAction");
	    this.swingset = swingset;
        }
	
		
        public void actionPerformed(ActionEvent e) {
			swingset.getFrame().openFile();
    }}
	
	
	
	class AboutPanel extends JPanel {
	ImageIcon aboutimage = null;
	SwingSet2 swingset = null;

	public AboutPanel(SwingSet2 swingset) {
	    this.swingset = swingset;
	    aboutimage = swingset.createImageIcon("About.jpg", "AboutBox.accessible_description");
	    setOpaque(false);
	}

	public void paint(Graphics g) {
	    aboutimage.paintIcon(this, g, 0, 0);
	    super.paint(g);
	}

	public Dimension getPreferredSize() {
	    return new Dimension(aboutimage.getIconWidth(),
				 aboutimage.getIconHeight());
	}
    }
	
	
	
	
	
	
}