Question

The WebBrowser control in WPF is inherited from theUIElement, but we cannot register event handlers in UIElement events. Why is it? At WPF WebBrowser Mouse Events not working as expected, it is answered but I still cannot understand.

Anyway, hooking up handlers to the events provided by the document of the WebBrowser can catch most mouse events but cannot use ‘Back’ & ‘Forward’ navigation button events. Since the internet explorer can do this, I think it is possible. Is there any way to solve this issue?

UPDATE:
In this question, 'Back' & 'Forward' navigation buttonsmean XButton1 and XButton2 in 5-button mouse system.

UPDATE2: I fixed this question with the Navid Rahmani’s answer. I’d think someone will need this answer, so I attach main part. If finding any problem or more reasonable solution, please let me know.

    //This code assumes the `WebBrowser` field named _webBrowser is already initiated.
    //For the detail out of this code, please refer to the Navid Rahmani's answer.

    private bool _isMouseOver;
    private HTMLDocumentEvents2_Event _docEvent;    

    public ctor()
    {
        _webBrowser.LoadCompleted += _webBrowser_LoadCompleted;
    }

    private void _webBrowser_LoadCompleted(object sender, NavigationEventArgs e)
    {
        if (_docEvent != null)
        {
            _docEvent.onmouseover -= _docEvent_onmouseover;
            _docEvent.onmouseout -= _docEvent_onmouseout;
        }
        if (_webBrowser.Document != null)
        {
            _docEvent = (HTMLDocumentEvents2_Event)_webBrowser.Document;
            _docEvent.onmouseover += _docEvent_onmouseover;
            _docEvent.onmouseout += _docEvent_onmouseout;
        }
    }

    void _docEvent_onmouseout(IHTMLEventObj pEvtObj)
    {
        _isMouseOver = false;
    }

    void _docEvent_onmouseover(IHTMLEventObj pEvtObj)
    {
        _isMouseOver = true;
    }


    private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (_isMouseOver)
        {
            if (nCode >= 0 && (MouseMessages)wParam == MouseMessages.XBUTTON)
            {
                var hookStruct = (Msllhookstruct)Marshal.PtrToStructure(lParam, typeof(Msllhookstruct));
                if (hookStruct.mouseData == 0x10000)
                {
                    //do something when XButto1 clicked
                }
                else if (hookStruct.mouseData == 0x20000)
                {
                    //do something when XButto2 clicked
                }
            }
        }
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }


    private enum MouseMessages
    {
        //WM_LBUTTONDOWN = 0x00A1,
        //WM_LBUTTONUP = 0x0202,
        //WM_MOUSEMOVE = 0x0200,
        //WM_MOUSEWHEEL = 0x020A,
        //WM_RBUTTONDOWN = 0x0204,
        //WM_RBUTTONUP = 0x0205,
        XBUTTON = 0x020B,
    }

Answer 1

You can use low level hook of mouse and check if the xbutton1 or xbutton2 clicked
look here

for the value of WM_XBUTTONDOWN look http://msdn.microsoft.com/en-us/library/ms646245(VS.85).aspx