io Programmo 39/IOPROG_39.ISO/SOFT/sdkjava40.exe/data1.cab/fg_Samples/Samples/ActiveX/JBrowser/JBrowser.java

Java Source | 2000-05-04 | 25.9 KB | 939 lines

//////////////////////////////////////////////////////////////////////////
// JBrowser.java
// This is a java application which hosts the WebBrowser control (IE4.0)
// and provides similar UI.
//
// (C) Copyright 1995 - 1999 Microsoft Corporation.  All rights reserved.
//////////////////////////////////////////////////////////////////////////

// AFC
import com.ms.ui.*;
import com.ms.ui.event.*;
import com.ms.fx.*;

// Component peers
import com.ms.awt.peer.ComponentPeerX;

// the IE ActiveX control
//import com.ms.ie.*;
import shdocvw.*;

// for hosting ActiveX Controls
import com.ms.activeX.*;
import com.ms.com.Variant;
import com.ms.com.ComSuccessException;
import com.ms.wfc.ax.IOleInPlaceActiveObject;

// standard Java
import java.awt.*;
import java.awt.event.*;

// Win32 classes
import com.ms.dll.*;
import com.ms.win32.*;


//
//
// JBrowser
//
//
class JBrowser extends Frame implements IUIActionListener, ActiveXControlListener, WebBrowserEventListener
{
    UIBandBox bandBox = new UIBandBox();                                                    // this contains all the bands.
    UIBand mainMenuBand = new UIBand();                                                        // the main menu band
    UIMenuList fileMenuList = new UIMenuList();                                                // the list of items in the file menu
    UIMenuButton fileMenu = new UIMenuButton("File", 0, fileMenuList);                        // the "File" menu
    UIMenuItem openItem = new UIMenuItem("Open");                                            // the open item in the file menu
    UIMenuItem exitItem = new UIMenuItem("Exit");                                            // the exit item in the file menu
    UIMenuList goMenuList = new UIMenuList();                                                // the list of items in the go menu
    UIMenuButton goMenu = new UIMenuButton("Go", 0, goMenuList);                            // the "Go" menu
    UIMenuItem backItem = new UIMenuItem("Back");                                            // the back item in the go menu
    UIMenuItem forwardItem = new UIMenuItem("Forward");                                        // the forward item in the go menu
    UIMenuItem homeItem = new UIMenuItem("Home");                                            // the home item in the go menu
    UIMenuItem searchItem = new UIMenuItem("Search");                                        // the search item in the go menu
    UIMenuList helpMenuList = new UIMenuList();                                                // the list of items in the help menu
    UIMenuButton helpMenu = new UIMenuButton("Help", 0, helpMenuList);                        // the "Help" menu
    UIMenuItem tutorialItem = new UIMenuItem("Web Tutorial");                                // the Web Tutorial item in the help menu
    UIMenuItem aboutItem = new UIMenuItem("About Java Browser");                            // the About ... item in the help menu.
    UIBand buttonsBand = new UIBand();                                                        // the band of buttons
    UIPushButton backButton;                                                                // go back to the last page button
    UIPushButton forwardButton;                                                                // fo forward to the next page button
    UIPushButton stopButton;                                                                // stop current transfer
    UIPushButton refreshButton;                                                                // refresh current page button
    UIPushButton homeButton;                                                                // go to the home page
    UIPushButton searchButton;                                                                // go to the search page
    UIBand addressBand = new UIBand("Address ");                                            // the band of addresses
    EditBox address = new EditBox();                                                        // the edit box for entering the text
    UIBand linksBand = new UIBand("Links");                                                    // the band of links
    UIPushButton bestOfWebButton;                                                            // the "Best of the Web" button
    UIPushButton microsoftJavaButton;                                                        // the microsoft Java page
    UIPushButton microsoftButton;                                                            // the "microsoft" page
    UIDrawText status = new UIDrawText("Status");                                            // to display the status text
    ProgressBar progress = new ProgressBar(300,20,100,0);                                    // to display the progress of the download
    StatusBar statusBar = new StatusBar(302,22);                                            // the status bar which displays progres and the status text
    WebBrowser browser = new WebBrowser();                                                    // the web browser object
    Thread animationThread;                                                                    // The thread which controls the animation of the image
    JAnim animatedImage;                                                                    // the animated image object
    UIPushButton animatedButton;                                                            // The button which has the animated image
    public Font dialogFont;                                                                    // the font to use in dialog boxes

    // message hook support
    HOOKPRC hproc;

    /**
     * The main method which creates a JBrowser object.
     * @param    String[]    The command line parameters
     */
    public static void main(String[] args)
    {
        new JBrowser();
    }

    /**
     * Null constructor for JBrowser object. It creates the following
     * <ol>
     * <li>Main Menu
     *    <ul>
     *    <li>File
     *        <ul>
     *        <li>Open</li>
     *        <li>Exit</li>
     *        </ul>
     *    </li>
     *    <li>Go
     *        <ul>
     *        <li>Back</li>
     *        <li>Forward</li>
     *        <li>Home Page</li>
     *        <li>Search The Web</li>
     *        </ul>
     *    </li>
     *    <li>Help
     *        <ul>
     *        <li>Web Tutorial</li>
     *        <li>About JBrowser</li>
     *        </ul>
     *    </li>
     * </li>
     * <li>An animated button
     * </li>
     * <li>Tool Bar with following icons
     *    <ul>
     *    <li>Back</li>
     *    <li>Forward</li>
     *    <li>Stop</li>
     *    <li>Refresh</li>
     *    <li>Home</li>
     *    <li>Search</li>
     *    </ul>
     * </li>
     * <li>Creates a bar with the following
     *    <ul>
     *    <li>An Address edit box</li>
     *    <li>A links bar with the following
     *        <ul>
     *        <li>Best of the web</li>
     *        <li>Microsoft Java</li>
     *        <li>Microsoft</li>
     *        <li>Yahoo</li>
     *        </ul>
     *    </li>
     *    </ul>
     * </li>
     * <li>Creates a status bar which has the following
     *    <ul>
     *        <li>A text label which prints the status text</li>
     *        <li>A progress bar which shows the progress of the current operation</li>
     *    </ul>
     * </li>
     * </ol>
     *
     */

    public JBrowser()
    {
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add event hooks to the JBrowser
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        addWindowListener(new JBrowserWindow());
        bandBox.addActionListener(this);
        browser.addWebBrowserEventListener(this);
        browser.addActiveXControlListener(this);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the main menu band
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

        // give the band box a new layout manager.
        bandBox.setLayout( new UIBarLayout(0,0) );

        // add the file menu
        fileMenuList.add(openItem);
        fileMenuList.add(exitItem);
        mainMenuBand.add(fileMenu);

        // add the go menu
        goMenuList.add(backItem);
        goMenuList.add(forwardItem);
        goMenuList.add(homeItem);
        goMenuList.add(searchItem);
        mainMenuBand.add(goMenu);

        // the forward and the back item will be enabled by browser events
        backItem.setEnabled(false);
        forwardItem.setEnabled(false);

        // add the help menu
        helpMenuList.add(tutorialItem);
        helpMenuList.add(aboutItem);
        mainMenuBand.add(helpMenu);

        mainMenuBand.setEdge(IFxGraphicsConstants.BDR_RAISED);

        bandBox.add(mainMenuBand);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // create and add an animated image
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        animatedImage = new JAnim( getToolkit().getImage("images/e.gif") , 46, 4 ) ;
        animatedButton = new UIPushButton(animatedImage);
        bandBox.add( animatedButton);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the buttons band
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

        // back button
        backButton = createButton("images/previous.gif", "images/previous_g.gif", "Back", UIItem.ABOVE);
        buttonsBand.add(backButton);

        // forward button
        forwardButton = createButton("images/next.gif", "images/next_g.gif", "Forward", UIItem.ABOVE);
        buttonsBand.add(forwardButton);

        // the forward and back buttons will be enabled by browser events
        backButton.setEnabled(false);
        forwardButton.setEnabled(false);

        // stop button
        stopButton = createButton("images/stop.gif", "images/stop_g.gif", "Stop", UIItem.ABOVE);
        buttonsBand.add(stopButton);

        //stop button will be enabled by a download begin event
        stopButton.setEnabled(false);

        // refresh button
        refreshButton = createButton("images/refresh.gif", "images/refresh_g.gif", "Refresh", UIItem.ABOVE);
        buttonsBand.add(refreshButton);

        // home button
        homeButton = createButton("images/home.gif", "images/home_g.gif", "Home", UIItem.ABOVE);
        buttonsBand.add(homeButton);

        // search button
        searchButton = createButton("images/search.gif", "images/search_g.gif", "Search", UIItem.ABOVE);
        buttonsBand.add(searchButton);

        buttonsBand.setEdge(IFxGraphicsConstants.BDR_RAISED);
        buttonsBand.setStyle(UIBand.BREAK);

        bandBox.add(buttonsBand);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the address band
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

        // a panel for hosting the editbox
        UIPanel addressPanel = new UIPanel();
        addressPanel.setBackground(FxColor.white);
        addressPanel.setEdge(IFxGraphicsConstants.BDR_SUNKEN);
        addressPanel.add(address, "center");
        addressBand.add(addressPanel);

        addressBand.setEdge(IFxGraphicsConstants.BDR_RAISED);
        addressBand.setStyle(UIBand.BREAK);
        bandBox.add(addressBand);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the links band
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        bestOfWebButton = createButton("images/favorite_small.gif", "images/favorite_small_g.gif", "Best of the Web", UIItem.ONLEFT);
        linksBand.add(bestOfWebButton);

        microsoftButton = createButton("images/favorite_small.gif", "images/favorite_small_g.gif", "Microsoft", UIItem.ONLEFT);
        linksBand.add(microsoftButton);

        microsoftJavaButton = createButton("images/favorite_small.gif", "images/favorite_small_g.gif", "Microsoft Java", UIItem.ONLEFT);
        linksBand.add(microsoftJavaButton);

        linksBand.setEdge(IFxGraphicsConstants.BDR_RAISED);
        linksBand.setStyle(UIBand.DRAGBREAK);

        bandBox.add(linksBand);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the band box
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        setLayout(new BorderLayout() );

        setBackground(FxColor.lightGray);

        bandBox.setEdge(IFxGraphicsConstants.BDR_SUNKEN);
        add("North", new AwtUIHost(bandBox) );


        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the ActiveX WebBrowser control
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        add("Center", browser);

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Add the status bar with status text and the progress bar in it.
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

        // this panel will host the status text and the progress bar
        statusBar.setEdge(IFxGraphicsConstants.BDR_RAISED);
        statusBar.setLayout( new UIBorderLayout() );

        // the status text
        statusBar.add(status, "center");

        // the progress bar
        statusBar.add(progress, "east");

        add("South", new AwtUIHost(statusBar) );

        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        // Show the JBrowser
        // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        setBounds(150,100,900,800);
        setTitle("JBrowser");
        setVisible(true);
        dialogFont = new Font("TimesRoman", Font.BOLD, 18) ;
    }


    /**
     * This class creates a push button with the specified hot and normal images and
     * a text to be displayed with the image. The button is hot-tracked
     *
     * @param String    The name of the normal image
     * @param String    The name of the hot image
     * @param String    The text to be displayed with image
     * @param int        The location of the image with respect to the text
     */
    UIPushButton createButton( String normal, String hot, String text, int where)
    {
        Image           gifnormal       = null;         // button in normal state
        Image           gifhot          = null;         // button in hot state
        MediaTracker    tracker;                        // to wait for the images to be loaded
        UIPushButton    button;                         // button to be returned

        // create a media tracker
        tracker = new MediaTracker(this);

        // load the normal image
        if (normal != null)
        {
            // load the normal image
            gifnormal = getToolkit().getImage(normal);

            // track the image neing loaded
            tracker.addImage(gifnormal, 0);
        }

       if (hot != null)
        {
               // load the hot-tracked image
            gifhot = getToolkit().getImage(hot);

            // listen on this image being loaded
            tracker.addImage(gifhot, 0);
        }

        // create the button
        button = new UIPushButton(new UIItem(gifnormal, text, UIItem.HOTTRACK, where), 0);
        //button = new UIPushButton( new UIStateItem(gifnormal, gifHot, text, UIStateItem.CENTERED, where), 0);

        // wait for all the images to be loaded
        try
        {
            tracker.waitForAll();
        }
        catch (InterruptedException e)
        {
        }

        return button;
    }

    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // Perform the browser actions
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    /**
     * This shows a dialog box describing the browser in response to the about
     * item in the help menu
     */
    public void about()
    {
        UIMessageBox aboutMsg = new UIMessageBox(new UIFrame(),"About JBrowser", "This is a web-browser written in Java which uses the ActiveX control IE4.0",
            UIMessageBox.INFORMATION, UIButtonBar.OK    );

        aboutMsg.setFont(dialogFont);
        aboutMsg.doModal();
    }

    /**
     * This navigates the browser object to a specified URL
     *
     * @param    String    The URL to go to.
     */
    public void navigate(String url)
    {
        browser.Navigate(url, null, null, null, null);
    }

    /**
     * This method displays a dialog box which takes a user specified URL
     * as input and navigates to that URL.
     */
    public void open()
    {
        new JBrowserOpen(this);
    }

    /**
     * This closes the browser application
     */
    public void exit()
    {
        // Unhook MsgProc Hook
        Win32.UnhookWindowsHookEx(hproc.hhk);
        hproc = null;

        browser.removeWebBrowserEventListener(this);
        browser.removeActiveXControlListener(this);
        System.exit(0);
    }

    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // Event handlers for the browser
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // Interface IUIActionListener requires the following method
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    /**
     * This procedure receives action events which occurred in the browser like keyclicks
     * on buttons or menuitems. It then calls the appropriate function to handle the event.
     *
     * @param    UIActionEvent    The event which occurred
     */
    public void actionPerformed(UIActionEvent evt)
    {
        Object target = evt.getActionItem();

        // ignore UIBand events
        if( evt.getSource() instanceof UIBand)
            return;

        if(target == address)
        {
            navigate( address.getValueText() );
        }

        else if(target == aboutItem)
        {
            about();
        }

        else if(target == backItem || target == backButton )
        {
            browser.GoBack();
        }

        else if( target == exitItem )
        {
            exit();
        }

        else if( target == forwardItem || target == forwardButton)
        {
            browser.GoForward();
        }

        else if (target == homeItem || target == homeButton)
        {
            browser.GoHome();
        }

        else if( target == microsoftButton)
        {
            navigate("http://www.microsoft.com");
        }

        else if(target == microsoftJavaButton)
        {
            navigate("http://www.microsoft.com/java");
        }

        else if(target == openItem)
        {
            open();
        }

        else if(target == refreshButton)
        {
            browser.Refresh();
        }

        else if(target == searchItem || target == searchButton)
        {
            browser.GoSearch();
        }

        else if(target == stopButton)
        {
            browser.Stop();
        }

        else if(target == tutorialItem)
        {
            navigate("http://www.microsoft.com/magazine/guides/internet/default.asp?");
        }

        else if(target == bestOfWebButton)
        {
            navigate("http://home.microsoft.com/exploring/exploring.asp");
        }

        else if(target == animatedButton)
        {
            navigate("http://www.microsoft.com/ie/default.asp");
        }
    }


    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // Interface ActiveXControlListener requires the following method
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


    /**
     * This procedure receives events from the activeX controls after they have been created
     * The browser control is made to start up from the home page.
     *
     * @param    Object    The control which was created
     */
    public void controlCreated(Object target)
    {
        if(target == browser)
        {
            browser.GoHome();

            // Hook a message filter into the message pump for the web browser
            // control, so that we can intercept messages and call
            // IOleInPlaceActiveObject.TranslateAccelerator as appropriate.
            ComponentPeerX apeer = (ComponentPeerX)browser.getPeer();
            if (apeer != null) {
                int hwnd = apeer.getTopHwnd();

                if (hwnd != 0) {
                    EnumCallback ec = new EnumCallback();
                    User32.EnumChildWindows(hwnd, ec, 0);
                    hwnd = ec.myChildWnd;

                    hproc = new HOOKPRC();
                    hproc.browser_obj = (IOleInPlaceActiveObject)browser.getObject();
                    int threadID = Win32.GetWindowThreadProcessId(hwnd, 0);
                    hproc.hhk = Win32.SetWindowsHookEx(Win32.WH_GETMESSAGE,
                                                       hproc, 0, threadID);
                }
            }

        }
    }

    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // Interface WebBrowserEventListener requires the following methods
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    /**
     * This method is invoked when the text in the status bar has to be changed
     *
     * @param    String    The new text
     */
    public void StatusTextChange(String text)
    {
        status.setValueText(text);
    }

    /**
     * This is invoked when the progress bar's position is to be changed
     *
     * @param    int    The position
     * @param    int    The maximum position
     */
    public void ProgressChange(int pos, int range)
    {
        // UIProgress doesn't like a range of 0 ;-)
        if(range <= 0)
            progress.setRange(100);
        else
            progress.setRange(range);

        // the position is set to -1 when the download has finished
        if(pos < 0)
            progress.setPos(0);
        else
            progress.setPos(pos);
    }

    /**
     * The title of the page being displayed
     *
     * @param    String    The new title
     */
    public void TitleChange(String text)
    {
        setTitle(text);
    }

    /**
     * This method is invoked when the Browser object has finished loading a document
     *
     * @param    Object    The web-browser frame in which this document was loaded
     * @param    Variant    The URL of the loaded document
     */
    public void DocumentComplete(Object pDisp, Variant URL)
    {
        address.setValueText( URL.getString() );
    }

    /**
     * This method is invoked when the enabled state of a command changes
     * for example when the forward command or the back command is no longer
     * enabled
     *
     * @param    int        The identifier of the command that changed
     * @param    boolean    Whether the command is enabled (=>true) or disabled
     */
    public void CommandStateChange(int Command, boolean Enable)
    {
        switch(Command)
        {
        case CommandStateChangeConstants.CSC_NAVIGATEFORWARD:
            forwardButton.setEnabled(Enable);
            forwardItem.setEnabled(Enable);
            break;

        case CommandStateChangeConstants.CSC_NAVIGATEBACK:
            backButton.setEnabled(Enable);
            backItem.setEnabled(Enable);
            break;
        }
    }

    /**
     * This method is called when the browser begins downloading
     */
    public void DownloadBegin()
    {
        // start a new thread for the animated image
        animationThread = new Thread( animatedImage, "Animated Image");
        animationThread.start();

        stopButton.setEnabled(true);
        progress.setVisible(true);
    }

    /**
     * This method is called when the browser ends downloading
     */
    public void DownloadComplete()
    {
        // stop the animated image thread.
        animationThread.stop();
        animatedImage.reset();

        stopButton.setEnabled(false);
        progress.setVisible(false);
    }


    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // The following methods of interface WebBrowserEventListener
    // are not implemented
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    public void PropertyChange(String szProperty)
    {
    }

    public void BeforeNavigate2(Object pDisp, Variant URL, Variant Flags, Variant TargetFrameName, Variant PostData, Variant Headers, boolean[] Cancel)
    {
    }

    public void NewWindow2(Object[] ppDisp, boolean[] Cancel)
    {
    }

    public void NavigateComplete2(Object pDisp, Variant URL)
    {
    }

    public void OnQuit()
    {
    }

    public void OnVisible(boolean Visible)
    {
    }

    public void OnToolBar(boolean ToolBar)
    {
    }

    public void OnMenuBar(boolean MenuBar)
    {
    }

    public void OnStatusBar(boolean StatusBar)
    {
    }

    public void OnFullScreen(boolean FullScreen)
    {
    }

    public void OnTheaterMode(boolean TheaterMode)
    {
    }

    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    // Interface WindowListener requires the following inner class
    // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    /**
     * This adapter class handles window events like when a user clicks on the
     * close window button it closes the browser.
     */
    class JBrowserWindow extends WindowAdapter
    {
        /**
         * Handles the event generated when the window is being closed
         *
         * @param    WindowEvent    The window event generated
         */
        public void windowClosing(WindowEvent event)
        {
            exit();
        }


    }
}

/**
 * The progress bar extends the AFC's UIProgress and specifies a size for the same
 */
class ProgressBar extends UIProgress
{
    private int width;                    // The width of the progress bar
    private int height;                    // The height of the progress bar

    /**
     * This constructor specifies the width and the height of the progress bar.
     *
     * @param    int    width
     * @param    int    height
     * @param    int    range -- The maximum range of the progress bar
     * @param    int    pos   -- The current position of the progress bar
     */
    public ProgressBar(int width, int height, int range, int pos)
    {
        // tell UIProgress what the range and the pos is
        super(range, pos);

        this.width = width;
        this.height = height;
    }

    /**
     * The preferred size of this progress bar
     *
     * @return    Dimension    The preferred dimension
     */
    public Dimension getPreferredSize()
    {
        return new Dimension(width, height);
    }

    /**
     * The minimum size of this progress bar
     *
     * @return    Dimension    The minimum size
     */
    public Dimension getMinimumSize()
    {
        return new Dimension(width, height);
    }
}

/**
 * The status bar is simply a UIPanel with a minimum size. This prevents it
 * from totally disappearing when it has nothing on it.
 */
class StatusBar extends UIPanel
{
    private int width;                    // The width of the status bar
    private int height;                    // The height of the status bar

    /**
     * This constructor specifies the width and the height of the status bar.
     *
     * @param    int    width
     * @param    int    height
     */
    public StatusBar(int width, int height)
    {
        this.width = width;
        this.height = height;
    }

    /**
     * The preferred size of this progress bar
     *
     * @return    Dimension    The preferred dimension
     */
    public Dimension getPreferredSize()
    {
        return new Dimension(width, height);
    }

    /**
     * The minimum size of this progress bar
     *
     * @return    Dimension    The minimum size
     */
    public Dimension getMinimumSize()
    {
        return new Dimension(width, height);
    }
}


/**
 * This is an edit-box for entering the address to navigate to in the
 * browser.
 */
class EditBox extends UIEdit
{

    /**
     * This creates a single line edit box
     */
    public EditBox()
    {
        setSingleLine(true);
        setBackground(FxColor.white);
    }

    /**
     * The preferred size of this edit
     *
     * @return    Dimension    The preferred dimension
     */

    public Dimension getPreferredSize()
    {
        return new Dimension(700, 16);
    }

    /**
     * The minimum size of this edit box
     *
     * @return    Dimension    The minimum size
     */
    public Dimension getMinimumSize()
    {
        return new Dimension(700, 16);
    }
}

/**
 * This is callback class used with User32.EnumChildWindows.
 */
class EnumCallback extends WNDENUMPROC
{

    public int myChildWnd;
    public String myChildWndClass;

    public boolean wndenumproc(int hwnd, int lparam)
    {
        myChildWnd = hwnd;
        return true; // stop enumerating, only interested in first child
    }
}

/**
 * This is callback class which process WndProc Msg filter callbacks.
 * The purpose is to correctly call
 * IOleInPlaceActiveObject::TranslateAccelerator, therefore allowing the
 * user to tab through the controls on the hosted web browser control.
 */
class HOOKPRC extends Callback {

    int hhk;
    IOleInPlaceActiveObject browser_obj;

    int callback(int code, int wParam,  int lParam)
    {
        if (code < 0) {
            return Win32.CallNextHookEx(hhk, code, wParam, lParam);
        }
        MSG msg = (MSG) DllLib.ptrToStruct(MSG.class, lParam);
        try {
            // IOleInPlaceActiveObject::TranslateAccelerator potentially
            // returns S_OK, which in this case, we Null out the current
            // message the message pump is processing.
            // If we receive S_FALSE, a ComSuccessException is thrown,
            // and the message will be processed by the message pump.
            browser_obj.TranslateAccelerator(msg);

            // we got an S_OK, NULL out message so the message pump will not
            // dispatch it
            msg.message = 0;
        }
        catch (ComSuccessException cse) { }
        catch (Exception e) {
            System.out.println("HOOKPRC EXCEPTION: "+e);
        }
        return 0;
    }
}

/**
 * This class contains helper functions and definitions for setting up the
 * HOOKPROC callback.
 */
class Win32
{
    public static final int WH_GETMESSAGE = 3;

    /** @dll.import("USER32",auto) */
    public native static int SetWindowsHookEx (int idHook, HOOKPRC lpfn, int hMod, int dwThreadId);

    /** @dll.import("USER32",auto) */
    public native static int CallNextHookEx (int hhk, int nCode, int wParam, int lParam);

    /** @dll.import("USER32",auto) */
    public native static int UnhookWindowsHookEx (int hhk);

    /** @dll.import("USER32",auto) */
    public native static int GetWindowThreadProcessId (int hWnd, int lpdwProcessId);
}