swingset2.java

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	currentDemo = demo;

	// Ensure panel's UI is current before making visible
	JComponent currentDemoPanel = demo.getDemoPanel();
	SwingUtilities.updateComponentTreeUI(currentDemoPanel);

	demoPanel.removeAll();
	demoPanel.add(currentDemoPanel, BorderLayout.CENTER);

	tabbedPane.setSelectedIndex(0);
	tabbedPane.setTitleAt(0, demo.getName());
	tabbedPane.setToolTipTextAt(0, demo.getToolTip());
    }


    /**
     * Bring up the SwingSet2 demo by showing the frame (only
     * applicable if coming up as an application, not an applet);
     */
    public void showSwingSet2() {
	if(!isApplet() && getFrame() != null) {
	    // put swingset in a frame and show it
	    JFrame f = getFrame();
	    f.setTitle(getString("Frame.title"));
	    f.getContentPane().add(this, BorderLayout.CENTER);
	    f.pack();

	    Rectangle screenRect = f.getGraphicsConfiguration().getBounds();
            Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets(
                    f.getGraphicsConfiguration());

            // Make sure we don't place the demo off the screen.
            int centerWidth = screenRect.width < f.getSize().width ?
                    screenRect.x :
                    screenRect.x + screenRect.width/2 - f.getSize().width/2;
            int centerHeight = screenRect.height < f.getSize().height ?
                    screenRect.y :
                    screenRect.y + screenRect.height/2 - f.getSize().height/2;

            centerHeight = centerHeight < screenInsets.top ?
                    screenInsets.top : centerHeight;

            f.setLocation(centerWidth, centerHeight);
	    f.show();
            numSSs++;
            swingSets.add(this);
	} 
    }

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

    /**
     * Loads a demo from a classname
     */
    void loadDemo(String classname) {
	setStatus(getString("Status.loading") + getString(classname + ".name"));
	DemoModule demo = null;
	try {
	    Class demoClass = Class.forName(classname);
	    Constructor demoConstructor = demoClass.getConstructor(new Class[]{SwingSet2.class});
	    demo = (DemoModule) demoConstructor.newInstance(new Object[]{this});
	    addDemo(demo);
	} catch (Exception e) {
	    System.out.println("Error occurred loading demo: " + classname);
	}
    }
    
    /**
     * A utility function that layers on top of the LookAndFeel's
     * isSupportedLookAndFeel() method. Returns true if the LookAndFeel
     * is supported. Returns false if the LookAndFeel is not supported
     * and/or if there is any kind of error checking if the LookAndFeel
     * is supported.
     *
     * The L&F menu will use this method to detemine whether the various
     * L&F options should be active or inactive.
     *
     */
     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;
         }
     }


    /**
     * Determines if this is an applet or application
     */
    public boolean isApplet() {
	return (applet != null);
    }

    /**
     * Returns the applet instance
     */
    public SwingSet2Applet getApplet() {
	return applet;
    }


    /**
     * Returns the frame instance
     */
    public JFrame getFrame() {
	return frame;
    }

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

    /**
     * Returns the toolbar
     */
    public ToggleButtonToolBar getToolBar() {
	return toolbar;
    }

    /**
     * Returns the toolbar button group
     */
    public ButtonGroup getToolBarGroup() {
	return toolbarGroup;
    }

    /**
     * Returns the content pane wether we're in an applet
     * or application
     */
    public Container getContentPane() {
	if(contentPane == null) {
	    if(getFrame() != null) {
		contentPane = getFrame().getContentPane();
	    } else if (getApplet() != null) {
		contentPane = getApplet().getContentPane();
	    }
	}
	return contentPane;
    }

    /**
     * Create a frame for SwingSet2 to reside in if brought up
     * as an application.
     */
    public static JFrame createFrame(GraphicsConfiguration gc) {
	JFrame frame = new JFrame(gc);
        if (numSSs == 0) {
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        } else {
	    WindowListener l = new WindowAdapter() {
	        public void windowClosing(WindowEvent e) {
                    numSSs--;
                    swingSets.remove(this);
	        }
	    };
	    frame.addWindowListener(l);
        }
	return frame;
    }


    /**
     * Set the status 
     */
    public void setStatus(String s) {
	// do the following on the gui thread
	SwingUtilities.invokeLater(new SwingSetRunnable(this, s) {
	    public void run() {
		swingset.statusField.setText((String) obj);
	    }
	});
    }


    /**
     * 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;
    }

    void setDragEnabled(boolean dragEnabled) {
        if (dragEnabled == this.dragEnabled) {
            return;
        }

        this.dragEnabled = dragEnabled;

        for (DemoModule dm : demosList) {
            dm.updateDragEnabled(dragEnabled);
        }

        demoSrcPane.setDragEnabled(dragEnabled);
    }
    
    boolean isDragEnabled() {
        return dragEnabled;
    }

    /**
     * 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;
            /* The recommended way of synchronizing state between multiple
             * controls that represent the same command is to use Actions.
             * The code below is a workaround and will be replaced in future
             * version of SwingSet2 demo.
             */
            String lafName = null;
            if(laf == mac) lafName = getString("LafMenu.mac_label");
            if(laf == metal) lafName = getString("LafMenu.java_label");
            if(laf == motif) lafName = getString("LafMenu.motif_label");
            if(laf == windows) lafName = getString("LafMenu.windows_label");
            if(laf == gtk) lafName = getString("LafMenu.gtk_label");
	    themesMenu.setEnabled(laf == metal);
	    updateLookAndFeel();
            for(int i=0;i<lafMenu.getItemCount();i++) {
                JMenuItem item = lafMenu.getItem(i);
                if(item.getText() == lafName) {
                    item.setSelected(true);
                } else {
                    item.setSelected(false);
                }
            }
	}
    }

    private void updateThisSwingSet() {
        if (isApplet()) {
            SwingUtilities.updateComponentTreeUI(getApplet());
        } else {
            JFrame frame = getFrame();
            if (frame == null) {
                SwingUtilities.updateComponentTreeUI(this);
            } else {
                SwingUtilities.updateComponentTreeUI(frame);
            }
        }

        SwingUtilities.updateComponentTreeUI(popupMenu);
        if (aboutBox != null) {
            SwingUtilities.updateComponentTreeUI(aboutBox);
        }
    }

    /**
     * Sets the current L&F on each demo module
     */
    public void updateLookAndFeel() {
	try {
	    UIManager.setLookAndFeel(currentLookAndFeel);
            if (isApplet()) {
                updateThisSwingSet();
            } else {
                for (SwingSet2 ss : swingSets) {
                    ss.updateThisSwingSet();
                }
            }
	} catch (Exception ex) {
	    System.out.println("Failed loading L&F: " + currentLookAndFeel);
	    System.out.println(ex);
	}
    }

    /**
     * Loads and puts the source code text into JEditorPane in the "Source Code" tab
     */
    public void setSourceCode(DemoModule demo) {
	// do the following on the gui thread
	SwingUtilities.invokeLater(new SwingSetRunnable(this, demo) {
	    public void run() {
		swingset.demoSrcPane.setText(((DemoModule)obj).getSourceCode());
		swingset.demoSrcPane.setCaretPosition(0);

	    }
	});
    }

    // *******************************************************
    // **************   ToggleButtonToolbar  *****************
    // *******************************************************
    static Insets zeroInsets = new Insets(1,1,1,1);
    protected class ToggleButtonToolBar extends JToolBar {
	public ToggleButtonToolBar() {
	    super();
	}

	JToggleButton addToggleButton(Action a) {
	    JToggleButton tb = new JToggleButton(
		(String)a.getValue(Action.NAME),
		(Icon)a.getValue(Action.SMALL_ICON)
	    );
	    tb.setMargin(zeroInsets);
	    tb.setText(null);
	    tb.setEnabled(a.isEnabled());
	    tb.setToolTipText((String)a.getValue(Action.SHORT_DESCRIPTION));