HtmlElement.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / WinForms / Managed / System / WinForms / HtmlElement.cs / 1 / HtmlElement.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.ComponentModel; 
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis; 
using System.Drawing;
using System.Drawing.Printing;
using System.IO;
using System.Net; 
using System.Runtime.InteropServices;
using System.Security; 
using System.Security.Permissions; 

namespace System.Windows.Forms 
{
    /// 
    /// 
    ///    [To be supplied.] 
    /// 
    [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")] 
    public sealed class HtmlElement 
    {
        internal static readonly object EventClick = new object(); 
        internal static readonly object EventDoubleClick = new object();
        internal static readonly object EventDrag = new object();
        internal static readonly object EventDragEnd = new object();
        internal static readonly object EventDragLeave = new object(); 
        internal static readonly object EventDragOver = new object();
        internal static readonly object EventFocusing = new object(); 
        internal static readonly object EventGotFocus = new object(); 
        internal static readonly object EventLosingFocus = new object();
        internal static readonly object EventLostFocus = new object(); 
        internal static readonly object EventKeyDown = new object();
        internal static readonly object EventKeyPress = new object();
        internal static readonly object EventKeyUp = new object();
        internal static readonly object EventMouseDown = new object(); 
        internal static readonly object EventMouseEnter = new object();
        internal static readonly object EventMouseLeave = new object(); 
        internal static readonly object EventMouseMove = new object(); 
        internal static readonly object EventMouseOver = new object();
        internal static readonly object EventMouseUp = new object(); 

        private UnsafeNativeMethods.IHTMLElement htmlElement;
        private HtmlShimManager shimManager;
 
        [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
        internal HtmlElement(HtmlShimManager shimManager, UnsafeNativeMethods.IHTMLElement element) 
        { 
            this.htmlElement = element;
            Debug.Assert(this.NativeHtmlElement != null, "The element object should implement IHTMLElement"); 

            this.shimManager = shimManager;

        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public HtmlElementCollection All
        {
            get
            { 
                UnsafeNativeMethods.IHTMLElementCollection iHTMLElementCollection = this.NativeHtmlElement.GetAll() as UnsafeNativeMethods.IHTMLElementCollection;
                return iHTMLElementCollection != null ? new HtmlElementCollection(shimManager, iHTMLElementCollection) : new HtmlElementCollection(shimManager); 
            } 
        }
 
        /// 
        /// 
        ///    [To be supplied.]
        ///  
        public HtmlElementCollection Children
        { 
            get 
            {
                UnsafeNativeMethods.IHTMLElementCollection iHTMLElementCollection = this.NativeHtmlElement.GetChildren() as UnsafeNativeMethods.IHTMLElementCollection; 
                return iHTMLElementCollection != null ? new HtmlElementCollection(shimManager, iHTMLElementCollection) : new HtmlElementCollection(shimManager);
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public bool CanHaveChildren 
        {
            get
            {
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).CanHaveChildren(); 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public Rectangle ClientRectangle
        { 
            get
            { 
                UnsafeNativeMethods.IHTMLElement2 htmlElement2 = (UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement; 
                return new Rectangle(htmlElement2.ClientLeft(), htmlElement2.ClientTop(),
                    htmlElement2.ClientWidth(), htmlElement2.ClientHeight()); 
            }
        }

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public HtmlDocument Document 
        {
            get
            {
                UnsafeNativeMethods.IHTMLDocument iHTMLDocument = this.NativeHtmlElement.GetDocument() as UnsafeNativeMethods.IHTMLDocument; 
                return iHTMLDocument != null ? new HtmlDocument(shimManager, iHTMLDocument) : null;
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public bool Enabled 
        {
            get 
            { 
                return !(((UnsafeNativeMethods.IHTMLElement3)this.NativeHtmlElement).GetDisabled());
            } 
            set
            {
                ((UnsafeNativeMethods.IHTMLElement3)this.NativeHtmlElement).SetDisabled(!value);
            } 
        }
 
        private HtmlElementShim ElementShim 
        {
            get 
            {
                if (ShimManager != null)
                {
                    HtmlElementShim shim = ShimManager.GetElementShim(this); 
                    if (shim == null)
                    { 
                        shimManager.AddElementShim(this); 
                        shim = ShimManager.GetElementShim(this);
                    } 
                    return shim;
                }
                return null;
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public HtmlElement FirstChild
        {
            get 
            {
                UnsafeNativeMethods.IHTMLElement iHtmlElement = null; 
                UnsafeNativeMethods.IHTMLDOMNode iHtmlDomNode = this.NativeHtmlElement as UnsafeNativeMethods.IHTMLDOMNode; 

                if( iHtmlDomNode != null ) 
                {
                    iHtmlElement = iHtmlDomNode.FirstChild() as UnsafeNativeMethods.IHTMLElement;
                }
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null; 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string Id
        { 
            [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")]
            get 
            { 
                return this.NativeHtmlElement.GetId();
            } 
            set
            {
                this.NativeHtmlElement.SetId(value);
            } 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string InnerHtml
        { 
            get
            { 
                return this.NativeHtmlElement.GetInnerHTML(); 
            }
            set 
            {
                try
                {
                    this.NativeHtmlElement.SetInnerHTML(value); 
                }
                catch (COMException ex) 
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258))
                    { 
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported));
                    }
                    throw;
                } 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string InnerText
        { 
            get
            { 
                return this.NativeHtmlElement.GetInnerText(); 
            }
            set 
            {
                try
                {
                    this.NativeHtmlElement.SetInnerText(value); 
                }
                catch (COMException ex) 
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258))
                    { 
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported));
                    }
                    throw;
                } 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string Name
        { 
            get
            { 
                return this.GetAttribute("Name"); 
            }
            set 
            {
                this.SetAttribute("Name", value);
            }
        } 

 
        private UnsafeNativeMethods.IHTMLElement NativeHtmlElement 
        {
            get 
            {
                return this.htmlElement;
            }
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public HtmlElement NextSibling
        {
            get
            { 
                UnsafeNativeMethods.IHTMLElement iHtmlElement = null;
                UnsafeNativeMethods.IHTMLDOMNode iHtmlDomNode = this.NativeHtmlElement as UnsafeNativeMethods.IHTMLDOMNode; 
 
                if( iHtmlDomNode != null )
                { 
                    iHtmlElement = iHtmlDomNode.NextSibling() as UnsafeNativeMethods.IHTMLElement;
                }
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null;
            } 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public Rectangle OffsetRectangle
        { 
            get
            { 
                return new Rectangle(this.NativeHtmlElement.GetOffsetLeft(), this.NativeHtmlElement.GetOffsetTop(), 
                    this.NativeHtmlElement.GetOffsetWidth(), this.NativeHtmlElement.GetOffsetHeight());
            } 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public HtmlElement OffsetParent 
        {
            get 
            {
                UnsafeNativeMethods.IHTMLElement iHtmlElement = this.NativeHtmlElement.GetOffsetParent();
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null;
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public string OuterHtml
        {
            get 
            {
                return this.NativeHtmlElement.GetOuterHTML(); 
            } 
            set
            { 
                try
                {
                    this.NativeHtmlElement.SetOuterHTML(value);
                } 
                catch (COMException ex)
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258)) 
                    {
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported)); 
                    }
                    throw;
                }
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public string OuterText
        {
            get 
            {
                return this.NativeHtmlElement.GetOuterText(); 
            } 
            set
            { 
                try
                {
                    this.NativeHtmlElement.SetOuterText(value);
                } 
                catch (COMException ex)
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258)) 
                    {
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported)); 
                    }
                    throw;
                }
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public HtmlElement Parent
        {
            get 
            {
                UnsafeNativeMethods.IHTMLElement iHtmlElement = this.NativeHtmlElement.GetParentElement(); 
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null; 
            }
        } 



        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public Rectangle ScrollRectangle
        { 
            get
            {
                UnsafeNativeMethods.IHTMLElement2 htmlElement2 = (UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement;
                return new Rectangle(htmlElement2.GetScrollLeft(), htmlElement2.GetScrollTop(), 
                    htmlElement2.GetScrollWidth(), htmlElement2.GetScrollHeight());
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public int ScrollLeft 
        {
            get 
            { 
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetScrollLeft();
            } 
            set
            {
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).SetScrollLeft(value);
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public int ScrollTop
        {
            get 
            {
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetScrollTop(); 
            } 
            set
            { 
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).SetScrollTop(value);
            }
        }
 
        private HtmlShimManager ShimManager
        { 
            get 
            {
                return shimManager; 
            }
        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public string Style
        { 
            get
            {
                return this.NativeHtmlElement.GetStyle().GetCssText();
            } 
            set
            { 
                this.NativeHtmlElement.GetStyle().SetCssText(value); 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public string TagName 
        { 
            get
            { 
                return this.NativeHtmlElement.GetTagName();
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public short TabIndex 
        {
            get
            {
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetTabIndex(); 
            }
            set 
            { 
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).SetTabIndex(value);
            } 
        }


        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public object DomElement
        { 
            get
            {
                return this.NativeHtmlElement;
            } 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public HtmlElement AppendChild(HtmlElement newElement)
        { 
            return this.InsertAdjacentElement(HtmlElementInsertionOrientation.BeforeEnd, newElement);
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void AttachEventHandler(string eventName, EventHandler eventHandler)
        { 
            ElementShim.AttachEventHandler(eventName, eventHandler);
        } 
 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public void DetachEventHandler(string eventName, EventHandler eventHandler) 
        {
            ElementShim.DetachEventHandler(eventName, eventHandler); 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public void Focus() 
        {
            try 
            { 
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).Focus();
            } 
            catch (COMException ex)
            {
                if (ex.ErrorCode == unchecked((int)0x800a083e))
                { 
                    throw new NotSupportedException(SR.GetString(SR.HtmlElementMethodNotSupported));
                } 
                throw; 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] 
        public string GetAttribute(string attributeName) 
        {
            object oAttributeValue = this.NativeHtmlElement.GetAttribute(attributeName, 0); 
            return oAttributeValue == null ? "" : oAttributeValue.ToString();
        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public HtmlElementCollection GetElementsByTagName(string tagName)
        { 
            UnsafeNativeMethods.IHTMLElementCollection iHTMLElementCollection = ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetElementsByTagName(tagName);
            return iHTMLElementCollection != null ? new HtmlElementCollection(shimManager, iHTMLElementCollection) : new HtmlElementCollection(shimManager);
        }
        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public HtmlElement InsertAdjacentElement(HtmlElementInsertionOrientation orient, HtmlElement newElement)
        { 
            UnsafeNativeMethods.IHTMLElement iHtmlElement = ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).InsertAdjacentElement(orient.ToString(),
                (UnsafeNativeMethods.IHTMLElement)newElement.DomElement);
            return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null;
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public object InvokeMember(string methodName)
        {
            return InvokeMember(methodName, null);
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public object InvokeMember(string methodName, params object[] parameter)
        {
            object retVal = null;
            NativeMethods.tagDISPPARAMS dp = new NativeMethods.tagDISPPARAMS(); 
            dp.rgvarg = IntPtr.Zero;
            try 
            { 
                UnsafeNativeMethods.IDispatch scriptObject = this.NativeHtmlElement as UnsafeNativeMethods.IDispatch;
                if (scriptObject != null) 
                {
                    Guid g = Guid.Empty;
                    string[] names = new string[] { methodName };
                    int[] dispids = new int[] { NativeMethods.ActiveX.DISPID_UNKNOWN }; 
                    int hr = scriptObject.GetIDsOfNames(ref g, names, 1,
                                                   SafeNativeMethods.GetThreadLCID(), dispids); 
                    if (NativeMethods.Succeeded(hr) && (dispids[0] != NativeMethods.ActiveX.DISPID_UNKNOWN)) 
                    {
                        // Reverse the arg order below so that parms are read properly thru IDispatch. (bug 187662) 
                        if (parameter != null)
                        {
                            // Reverse the parm order so that they read naturally after IDispatch. (bug 187662)
                            Array.Reverse(parameter); 
                        }
                        dp.rgvarg = (parameter == null) ? IntPtr.Zero : HtmlDocument.ArrayToVARIANTVector(parameter); 
                        dp.cArgs = (parameter == null) ? 0 : parameter.Length; 
                        dp.rgdispidNamedArgs = IntPtr.Zero;
                        dp.cNamedArgs = 0; 

                        object[] retVals = new object[1];

                        hr = scriptObject.Invoke(dispids[0], ref g, SafeNativeMethods.GetThreadLCID(), 
                                NativeMethods.DISPATCH_METHOD, dp,
                                retVals, new NativeMethods.tagEXCEPINFO(), null); 
                        if (hr == NativeMethods.S_OK) 
                        {
                            retVal = retVals[0]; 
                        }
                    }
                }
            } 
            catch (Exception ex)
            { 
                if (ClientUtils.IsSecurityOrCriticalException(ex)) 
                {
                    throw; 
                }
            }
            finally
            { 
                if (dp.rgvarg != IntPtr.Zero)
                { 
                    HtmlDocument.FreeVARIANTVector(dp.rgvarg, parameter.Length); 
                }
            } 
            return retVal;
        }

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public void RemoveFocus() 
        {
            ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).Blur();
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        // PM review done 
        [SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate")]
        public void RaiseEvent(string eventName)
        {
            ((UnsafeNativeMethods.IHTMLElement3)this.NativeHtmlElement).FireEvent(eventName, null); 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void ScrollIntoView(bool alignWithTop)
        { 
            this.NativeHtmlElement.ScrollIntoView((object)alignWithTop);
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void SetAttribute(string attributeName, string value)
        { 
            try
            { 
                this.NativeHtmlElement.SetAttribute(attributeName, (object)value, 0); 
            }
            catch (COMException comException) 
            {
                if (comException.ErrorCode == unchecked((int)0x80020009))
                {
                    throw new NotSupportedException(SR.GetString(SR.HtmlElementAttributeNotSupported)); 
                }
                throw; 
            } 
        }
 

        //
        // Events:
        // 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler Click 
        {
            add
            {
                ElementShim.AddHandler(EventClick, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventClick, value);
            } 

        }

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler DoubleClick 
        {
            add
            {
                ElementShim.AddHandler(EventDoubleClick, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventDoubleClick, value);
            } 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler Drag 
        {
            add 
            {
                ElementShim.AddHandler(EventDrag, value);
            }
            remove 
            {
                ElementShim.RemoveHandler(EventDrag, value); 
            } 
        }
 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler DragEnd 
        { 
            add
            { 
                ElementShim.AddHandler(EventDragEnd, value);
            }
            remove
            { 
                ElementShim.RemoveHandler(EventDragEnd, value);
            } 
        } 

 
        /// 
        /// 
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler DragLeave
        { 
            add 
            {
                ElementShim.AddHandler(EventDragLeave, value); 
            }
            remove
            {
                ElementShim.RemoveHandler(EventDragLeave, value); 
            }
 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public event HtmlElementEventHandler DragOver 
        {
            add 
            { 
                ElementShim.AddHandler(EventDragOver, value);
            } 
            remove
            {
                ElementShim.RemoveHandler(EventDragOver, value);
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler Focusing
        {
            add 
            {
                ElementShim.AddHandler(EventFocusing, value); 
            } 
            remove
            { 
                ElementShim.RemoveHandler(EventFocusing, value);
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler GotFocus 
        {
            add
            {
                ElementShim.AddHandler(EventGotFocus, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventGotFocus, value);
            } 

        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public event HtmlElementEventHandler LosingFocus
        { 
            add
            {
                ElementShim.AddHandler(EventLosingFocus, value);
            } 
            remove
            { 
                ElementShim.RemoveHandler(EventLosingFocus, value); 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler LostFocus 
        { 
            add
            { 
                ElementShim.AddHandler(EventLostFocus, value);
            }
            remove
            { 
                ElementShim.RemoveHandler(EventLostFocus, value);
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public event HtmlElementEventHandler KeyDown 
        {
            add 
            { 
                ElementShim.AddHandler(EventKeyDown, value);
            } 
            remove
            {
                ElementShim.RemoveHandler(EventKeyDown, value);
            } 
        }
        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler KeyPress
        {
            add
            { 
                ElementShim.AddHandler(EventKeyPress, value);
            } 
            remove 
            {
                ElementShim.RemoveHandler(EventKeyPress, value); 
            }

        }
        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public event HtmlElementEventHandler KeyUp
        { 
            add
            {
                ElementShim.AddHandler(EventKeyUp, value);
            } 
            remove
            { 
                ElementShim.RemoveHandler(EventKeyUp, value); 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler MouseMove 
        { 
            add
            { 
                ElementShim.AddHandler(EventMouseMove, value);
            }
            remove
            { 
                ElementShim.RemoveHandler(EventMouseMove, value);
            } 
        } 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public event HtmlElementEventHandler MouseDown
        { 
            add
            { 
                ElementShim.AddHandler(EventMouseDown, value); 
            }
            remove 
            {
                ElementShim.RemoveHandler(EventMouseDown, value);
            }
        } 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler MouseOver 
        {
            add
            {
                ElementShim.AddHandler(EventMouseOver, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventMouseOver, value);
            } 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler MouseUp 
        {
            add 
            {
                ElementShim.AddHandler(EventMouseUp, value);
            }
            remove 
            {
                ElementShim.RemoveHandler(EventMouseUp, value); 
            } 
        }
 
        /// 
        /// 
        ///    Fires when the mouse enters the element
        ///  
        public event HtmlElementEventHandler MouseEnter
        { 
            add 
            {
                ElementShim.AddHandler(EventMouseEnter, value); 
            }
            remove
            {
                ElementShim.RemoveHandler(EventMouseEnter, value); 
            }
        } 
 
        /// 
        ///  
        ///    Fires when the mouse leaves the element
        /// 
        public event HtmlElementEventHandler MouseLeave
        { 
            add
            { 
                ElementShim.AddHandler(EventMouseLeave, value); 
            }
            remove 
            {
                ElementShim.RemoveHandler(EventMouseLeave, value);
            }
        } 

        // 
        // Private classes: 
        //
        [ClassInterface(ClassInterfaceType.None)] 
        private class HTMLElementEvents2 : StandardOleMarshalObject, /*Enforce calling back on the same thread*/
                                           UnsafeNativeMethods.DHTMLElementEvents2,
                                           UnsafeNativeMethods.DHTMLAnchorEvents2,
                                           UnsafeNativeMethods.DHTMLAreaEvents2, 
                                           UnsafeNativeMethods.DHTMLButtonElementEvents2,
                                           UnsafeNativeMethods.DHTMLControlElementEvents2, 
                                           UnsafeNativeMethods.DHTMLFormElementEvents2, 
                                           UnsafeNativeMethods.DHTMLFrameSiteEvents2,
                                           UnsafeNativeMethods.DHTMLImgEvents2, 
                                           UnsafeNativeMethods.DHTMLInputFileElementEvents2,
                                           UnsafeNativeMethods.DHTMLInputImageEvents2,
                                           UnsafeNativeMethods.DHTMLInputTextElementEvents2,
                                           UnsafeNativeMethods.DHTMLLabelEvents2, 
                                           UnsafeNativeMethods.DHTMLLinkElementEvents2,
                                           UnsafeNativeMethods.DHTMLMapEvents2, 
                                           UnsafeNativeMethods.DHTMLMarqueeElementEvents2, 
                                           UnsafeNativeMethods.DHTMLOptionButtonElementEvents2,
                                           UnsafeNativeMethods.DHTMLSelectElementEvents2, 
                                           UnsafeNativeMethods.DHTMLStyleElementEvents2,
                                           UnsafeNativeMethods.DHTMLTableEvents2,
                                           UnsafeNativeMethods.DHTMLTextContainerEvents2,
                                           UnsafeNativeMethods.DHTMLScriptEvents2 
        {
 
            private HtmlElement parent; 

            public HTMLElementEvents2(HtmlElement htmlElement) 
            {
                this.parent = htmlElement;
            }
            private void FireEvent(object key, EventArgs e) 
            {
                if (this.parent != null) 
                { 
                    parent.ElementShim.FireEvent(key, e);
                } 
            }


            public bool onclick(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventClick, e); 
                return e.ReturnValue;
            } 

            public bool ondblclick(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDoubleClick, e);
                return e.ReturnValue; 
            } 

            public bool onkeypress(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventKeyPress, e);
                return e.ReturnValue; 
            }
 
            public void onkeydown(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventKeyDown, e);
            }

            public void onkeyup(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventKeyUp, e); 
            }
 
            public void onmouseover(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventMouseOver, e); 
            }
 
            public void onmousemove(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseMove, e);
            }

            public void onmousedown(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseDown, e); 
            }
 
            public void onmouseup(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventMouseUp, e); 
            }
 
            public void onmouseenter(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseEnter, e);
            }

            public void onmouseleave(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseLeave, e); 
            }
 
            public bool onerrorupdate(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }
 
            public void onfocus(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventGotFocus, e);
            }

            public bool ondrag(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDrag, e); 
                return e.ReturnValue;
            } 

            public void ondragend(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDragEnd, e);
            } 
 
            public void ondragleave(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventDragLeave, e);
            }
 
            public bool ondragover(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDragOver, e);
                return e.ReturnValue; 
            }

            public void onfocusin(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventFocusing, e); 
            } 

            public void onfocusout(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventLosingFocus, e);
            } 

            public void onblur(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventLostFocus, e); 
            }

            public void onresizeend(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onresizestart(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 

            public bool onhelp(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 
 
            public void onmouseout(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onselectstart(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }
 
            public void onfilterchange(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public bool ondragstart(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool onbeforeupdate(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public void onafterupdate(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onrowexit(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 

            public void onrowenter(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void ondatasetchanged(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void ondataavailable(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void ondatasetcomplete(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onlosecapture(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void onpropertychange(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onscroll(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onresize(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public bool ondragenter(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool ondrop(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public bool onbeforecut(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public bool oncut(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool onbeforecopy(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public bool oncopy(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public bool onbeforepaste(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool onpaste(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public bool oncontextmenu(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public void onrowsdelete(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onrowsinserted(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void oncellchange(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onreadystatechange(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void onlayoutcomplete(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onpage(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void onactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void ondeactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onbeforedeactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            }

            public bool onbeforeactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue; 
            }
 
            public void onmove(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public bool oncontrolselect(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public bool onmovestart(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public void onmoveend(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public bool onmousewheel(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            }
 
            public bool onchange(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 

            public void onselect(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void onload(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onerror(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void onabort(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onsubmit(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }
 
            public bool onreset(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            }

            public void onchange_void(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onbounce(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void onfinish(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onstart(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
        }

 
        ///
        /// HtmlElementShim - this is the glue between the DOM eventing mechanisms 
        ///                    and our CLR callbacks. 
        ///
        ///     HTMLElementEvents2: we create an IConnectionPoint (via ConnectionPointCookie) between us and MSHTML and it calls back 
        ///                        on our an instance of HTMLElementEvents2.  The HTMLElementEvents2 class then fires the event.
        ///
        ///
        internal class HtmlElementShim : HtmlShim 
        {
 
            private static Type[] dispInterfaceTypes = {typeof(UnsafeNativeMethods.DHTMLElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLAnchorEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLAreaEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLButtonElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLControlElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLFormElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLFrameSiteEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLImgEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLInputFileElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLInputImageEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLInputTextElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLLabelEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLLinkElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLMapEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLMarqueeElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLOptionButtonElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLSelectElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLStyleElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLTableEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLTextContainerEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLScriptEvents2)}; 

            private AxHost.ConnectionPointCookie cookie;   // To hook up events from the native HtmlElement
            private HtmlElement htmlElement;
            private UnsafeNativeMethods.IHTMLWindow2 associatedWindow = null; 

            public HtmlElementShim(HtmlElement element) 
            { 
                this.htmlElement = element;
 
                // snap our associated window so we know when to disconnect.
                if (this.htmlElement != null)
                {
                    HtmlDocument doc = this.htmlElement.Document; 
                    if (doc != null)
                    { 
                        HtmlWindow window = doc.Window; 
                        if (window != null)
                        { 
                            associatedWindow = window.NativeHtmlWindow;
                        }
                    }
                } 
            }
 
            public UnsafeNativeMethods.IHTMLElement NativeHtmlElement 
            {
                get { return htmlElement.NativeHtmlElement; } 
            }

            internal HtmlElement Element
            { 
                get { return htmlElement; }
            } 
 
            public override UnsafeNativeMethods.IHTMLWindow2 AssociatedWindow
            { 
                get { return associatedWindow; }
            }

            /// Support IHTMLElement2.AttachEventHandler 
            public override void AttachEventHandler(string eventName, System.EventHandler eventHandler)
            { 
 
                // IE likes to call back on an IDispatch of DISPID=0 when it has an event,
                // the HtmlToClrEventProxy helps us fake out the CLR so that we can call back on 
                // our EventHandler properly.

                HtmlToClrEventProxy proxy = AddEventProxy(eventName, eventHandler);
                bool success = ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).AttachEvent(eventName, proxy); 
                Debug.Assert(success, "failed to add event");
            } 
 
            public override void ConnectToEvents()
            { 
                if (cookie == null || !cookie.Connected)
                {
                    for (int i = 0; i < dispInterfaceTypes.Length && this.cookie == null; i++)
                    { 
                        this.cookie = new AxHost.ConnectionPointCookie(this.NativeHtmlElement,
                                                                                  new HTMLElementEvents2(htmlElement), 
                                                                                  dispInterfaceTypes[i], 
                                                                                  /*throwException*/ false);
                        if (!cookie.Connected) 
                        {
                            cookie = null;
                        }
                    } 
                }
            } 
 
            /// Support IHTMLElement2.DetachHandler
            public override void DetachEventHandler(string eventName, System.EventHandler eventHandler) 
            {
                HtmlToClrEventProxy proxy = RemoveEventProxy(eventHandler);
                if (proxy != null)
                { 
                    ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).DetachEvent(eventName, proxy);
                } 
            } 

 
            public override void DisconnectFromEvents()
            {
                if (this.cookie != null)
                { 
                    this.cookie.Disconnect();
                    this.cookie = null; 
                } 

            } 
            protected override void Dispose(bool disposing)
            {
                base.Dispose(disposing);
                if (htmlElement != null) 
                {
                    Marshal.FinalReleaseComObject(htmlElement.NativeHtmlElement); 
                } 
                htmlElement = null;
            } 

            protected override object GetEventSender()
            {
                return htmlElement; 
            }
 
        } 

            #region operators 
        /// 
        [SuppressMessage("Microsoft.Design", "CA1046:DoNotOverrideOperatorEqualsOnReferenceTypes")]
        public static bool operator ==(HtmlElement left, HtmlElement right)
        { 
            //Not equal if only one's null.
            if (object.ReferenceEquals(left, null) != object.ReferenceEquals(right, null)) 
            { 
                return false;
            } 

            //Equal if both are null.
            if (object.ReferenceEquals(left, null))
            { 
                return true;
            } 
 
            //Neither are null.  Get the IUnknowns and compare them.
            IntPtr leftPtr = IntPtr.Zero; 
            IntPtr rightPtr = IntPtr.Zero;
            try
            {
                leftPtr = Marshal.GetIUnknownForObject(left.NativeHtmlElement); 
                rightPtr = Marshal.GetIUnknownForObject(right.NativeHtmlElement);
                return leftPtr == rightPtr; 
            } 
            finally
            { 
                if (leftPtr != IntPtr.Zero)
                {
                    Marshal.Release(leftPtr);
                } 
                if (rightPtr != IntPtr.Zero)
                { 
                    Marshal.Release(rightPtr); 
                }
            } 
        }

        /// 
        public static bool operator !=(HtmlElement left, HtmlElement right) 
        {
            return !(left == right); 
        } 

        ///  
        public override int GetHashCode()
        {
            return htmlElement == null ? 0 : htmlElement.GetHashCode();
        } 

        ///  
        public override bool Equals(object obj) 
        {
            //If obj isn't an HtmlElement, we want Equals to return false.  this will 
            //never be null, so now it will return false as expected (not throw).
            return this == (obj as HtmlElement);
        }
            #endregion 

 
 
    }
 
    /// 
    /// 
    ///    [To be supplied.]
    ///  
    public enum HtmlElementInsertionOrientation
    { 
        ///  
        BeforeBegin,
        ///  
        AfterBegin,
        /// 
        BeforeEnd,
        ///  
        AfterEnd
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.ComponentModel; 
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis; 
using System.Drawing;
using System.Drawing.Printing;
using System.IO;
using System.Net; 
using System.Runtime.InteropServices;
using System.Security; 
using System.Security.Permissions; 

namespace System.Windows.Forms 
{
    /// 
    /// 
    ///    [To be supplied.] 
    /// 
    [PermissionSetAttribute(SecurityAction.LinkDemand, Name = "FullTrust")] 
    public sealed class HtmlElement 
    {
        internal static readonly object EventClick = new object(); 
        internal static readonly object EventDoubleClick = new object();
        internal static readonly object EventDrag = new object();
        internal static readonly object EventDragEnd = new object();
        internal static readonly object EventDragLeave = new object(); 
        internal static readonly object EventDragOver = new object();
        internal static readonly object EventFocusing = new object(); 
        internal static readonly object EventGotFocus = new object(); 
        internal static readonly object EventLosingFocus = new object();
        internal static readonly object EventLostFocus = new object(); 
        internal static readonly object EventKeyDown = new object();
        internal static readonly object EventKeyPress = new object();
        internal static readonly object EventKeyUp = new object();
        internal static readonly object EventMouseDown = new object(); 
        internal static readonly object EventMouseEnter = new object();
        internal static readonly object EventMouseLeave = new object(); 
        internal static readonly object EventMouseMove = new object(); 
        internal static readonly object EventMouseOver = new object();
        internal static readonly object EventMouseUp = new object(); 

        private UnsafeNativeMethods.IHTMLElement htmlElement;
        private HtmlShimManager shimManager;
 
        [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
        internal HtmlElement(HtmlShimManager shimManager, UnsafeNativeMethods.IHTMLElement element) 
        { 
            this.htmlElement = element;
            Debug.Assert(this.NativeHtmlElement != null, "The element object should implement IHTMLElement"); 

            this.shimManager = shimManager;

        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public HtmlElementCollection All
        {
            get
            { 
                UnsafeNativeMethods.IHTMLElementCollection iHTMLElementCollection = this.NativeHtmlElement.GetAll() as UnsafeNativeMethods.IHTMLElementCollection;
                return iHTMLElementCollection != null ? new HtmlElementCollection(shimManager, iHTMLElementCollection) : new HtmlElementCollection(shimManager); 
            } 
        }
 
        /// 
        /// 
        ///    [To be supplied.]
        ///  
        public HtmlElementCollection Children
        { 
            get 
            {
                UnsafeNativeMethods.IHTMLElementCollection iHTMLElementCollection = this.NativeHtmlElement.GetChildren() as UnsafeNativeMethods.IHTMLElementCollection; 
                return iHTMLElementCollection != null ? new HtmlElementCollection(shimManager, iHTMLElementCollection) : new HtmlElementCollection(shimManager);
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public bool CanHaveChildren 
        {
            get
            {
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).CanHaveChildren(); 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public Rectangle ClientRectangle
        { 
            get
            { 
                UnsafeNativeMethods.IHTMLElement2 htmlElement2 = (UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement; 
                return new Rectangle(htmlElement2.ClientLeft(), htmlElement2.ClientTop(),
                    htmlElement2.ClientWidth(), htmlElement2.ClientHeight()); 
            }
        }

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public HtmlDocument Document 
        {
            get
            {
                UnsafeNativeMethods.IHTMLDocument iHTMLDocument = this.NativeHtmlElement.GetDocument() as UnsafeNativeMethods.IHTMLDocument; 
                return iHTMLDocument != null ? new HtmlDocument(shimManager, iHTMLDocument) : null;
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public bool Enabled 
        {
            get 
            { 
                return !(((UnsafeNativeMethods.IHTMLElement3)this.NativeHtmlElement).GetDisabled());
            } 
            set
            {
                ((UnsafeNativeMethods.IHTMLElement3)this.NativeHtmlElement).SetDisabled(!value);
            } 
        }
 
        private HtmlElementShim ElementShim 
        {
            get 
            {
                if (ShimManager != null)
                {
                    HtmlElementShim shim = ShimManager.GetElementShim(this); 
                    if (shim == null)
                    { 
                        shimManager.AddElementShim(this); 
                        shim = ShimManager.GetElementShim(this);
                    } 
                    return shim;
                }
                return null;
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public HtmlElement FirstChild
        {
            get 
            {
                UnsafeNativeMethods.IHTMLElement iHtmlElement = null; 
                UnsafeNativeMethods.IHTMLDOMNode iHtmlDomNode = this.NativeHtmlElement as UnsafeNativeMethods.IHTMLDOMNode; 

                if( iHtmlDomNode != null ) 
                {
                    iHtmlElement = iHtmlDomNode.FirstChild() as UnsafeNativeMethods.IHTMLElement;
                }
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null; 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string Id
        { 
            [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")]
            get 
            { 
                return this.NativeHtmlElement.GetId();
            } 
            set
            {
                this.NativeHtmlElement.SetId(value);
            } 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string InnerHtml
        { 
            get
            { 
                return this.NativeHtmlElement.GetInnerHTML(); 
            }
            set 
            {
                try
                {
                    this.NativeHtmlElement.SetInnerHTML(value); 
                }
                catch (COMException ex) 
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258))
                    { 
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported));
                    }
                    throw;
                } 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string InnerText
        { 
            get
            { 
                return this.NativeHtmlElement.GetInnerText(); 
            }
            set 
            {
                try
                {
                    this.NativeHtmlElement.SetInnerText(value); 
                }
                catch (COMException ex) 
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258))
                    { 
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported));
                    }
                    throw;
                } 
            }
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public string Name
        { 
            get
            { 
                return this.GetAttribute("Name"); 
            }
            set 
            {
                this.SetAttribute("Name", value);
            }
        } 

 
        private UnsafeNativeMethods.IHTMLElement NativeHtmlElement 
        {
            get 
            {
                return this.htmlElement;
            }
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public HtmlElement NextSibling
        {
            get
            { 
                UnsafeNativeMethods.IHTMLElement iHtmlElement = null;
                UnsafeNativeMethods.IHTMLDOMNode iHtmlDomNode = this.NativeHtmlElement as UnsafeNativeMethods.IHTMLDOMNode; 
 
                if( iHtmlDomNode != null )
                { 
                    iHtmlElement = iHtmlDomNode.NextSibling() as UnsafeNativeMethods.IHTMLElement;
                }
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null;
            } 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public Rectangle OffsetRectangle
        { 
            get
            { 
                return new Rectangle(this.NativeHtmlElement.GetOffsetLeft(), this.NativeHtmlElement.GetOffsetTop(), 
                    this.NativeHtmlElement.GetOffsetWidth(), this.NativeHtmlElement.GetOffsetHeight());
            } 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public HtmlElement OffsetParent 
        {
            get 
            {
                UnsafeNativeMethods.IHTMLElement iHtmlElement = this.NativeHtmlElement.GetOffsetParent();
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null;
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public string OuterHtml
        {
            get 
            {
                return this.NativeHtmlElement.GetOuterHTML(); 
            } 
            set
            { 
                try
                {
                    this.NativeHtmlElement.SetOuterHTML(value);
                } 
                catch (COMException ex)
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258)) 
                    {
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported)); 
                    }
                    throw;
                }
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public string OuterText
        {
            get 
            {
                return this.NativeHtmlElement.GetOuterText(); 
            } 
            set
            { 
                try
                {
                    this.NativeHtmlElement.SetOuterText(value);
                } 
                catch (COMException ex)
                { 
                    if (ex.ErrorCode == unchecked((int)0x800a0258)) 
                    {
                        throw new NotSupportedException(SR.GetString(SR.HtmlElementPropertyNotSupported)); 
                    }
                    throw;
                }
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public HtmlElement Parent
        {
            get 
            {
                UnsafeNativeMethods.IHTMLElement iHtmlElement = this.NativeHtmlElement.GetParentElement(); 
                return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null; 
            }
        } 



        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public Rectangle ScrollRectangle
        { 
            get
            {
                UnsafeNativeMethods.IHTMLElement2 htmlElement2 = (UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement;
                return new Rectangle(htmlElement2.GetScrollLeft(), htmlElement2.GetScrollTop(), 
                    htmlElement2.GetScrollWidth(), htmlElement2.GetScrollHeight());
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public int ScrollLeft 
        {
            get 
            { 
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetScrollLeft();
            } 
            set
            {
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).SetScrollLeft(value);
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public int ScrollTop
        {
            get 
            {
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetScrollTop(); 
            } 
            set
            { 
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).SetScrollTop(value);
            }
        }
 
        private HtmlShimManager ShimManager
        { 
            get 
            {
                return shimManager; 
            }
        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public string Style
        { 
            get
            {
                return this.NativeHtmlElement.GetStyle().GetCssText();
            } 
            set
            { 
                this.NativeHtmlElement.GetStyle().SetCssText(value); 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public string TagName 
        { 
            get
            { 
                return this.NativeHtmlElement.GetTagName();
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public short TabIndex 
        {
            get
            {
                return ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetTabIndex(); 
            }
            set 
            { 
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).SetTabIndex(value);
            } 
        }


        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public object DomElement
        { 
            get
            {
                return this.NativeHtmlElement;
            } 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public HtmlElement AppendChild(HtmlElement newElement)
        { 
            return this.InsertAdjacentElement(HtmlElementInsertionOrientation.BeforeEnd, newElement);
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void AttachEventHandler(string eventName, EventHandler eventHandler)
        { 
            ElementShim.AttachEventHandler(eventName, eventHandler);
        } 
 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public void DetachEventHandler(string eventName, EventHandler eventHandler) 
        {
            ElementShim.DetachEventHandler(eventName, eventHandler); 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public void Focus() 
        {
            try 
            { 
                ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).Focus();
            } 
            catch (COMException ex)
            {
                if (ex.ErrorCode == unchecked((int)0x800a083e))
                { 
                    throw new NotSupportedException(SR.GetString(SR.HtmlElementMethodNotSupported));
                } 
                throw; 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        [SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")] 
        public string GetAttribute(string attributeName) 
        {
            object oAttributeValue = this.NativeHtmlElement.GetAttribute(attributeName, 0); 
            return oAttributeValue == null ? "" : oAttributeValue.ToString();
        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public HtmlElementCollection GetElementsByTagName(string tagName)
        { 
            UnsafeNativeMethods.IHTMLElementCollection iHTMLElementCollection = ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).GetElementsByTagName(tagName);
            return iHTMLElementCollection != null ? new HtmlElementCollection(shimManager, iHTMLElementCollection) : new HtmlElementCollection(shimManager);
        }
        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public HtmlElement InsertAdjacentElement(HtmlElementInsertionOrientation orient, HtmlElement newElement)
        { 
            UnsafeNativeMethods.IHTMLElement iHtmlElement = ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).InsertAdjacentElement(orient.ToString(),
                (UnsafeNativeMethods.IHTMLElement)newElement.DomElement);
            return iHtmlElement != null ? new HtmlElement(shimManager, iHtmlElement) : null;
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public object InvokeMember(string methodName)
        {
            return InvokeMember(methodName, null);
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public object InvokeMember(string methodName, params object[] parameter)
        {
            object retVal = null;
            NativeMethods.tagDISPPARAMS dp = new NativeMethods.tagDISPPARAMS(); 
            dp.rgvarg = IntPtr.Zero;
            try 
            { 
                UnsafeNativeMethods.IDispatch scriptObject = this.NativeHtmlElement as UnsafeNativeMethods.IDispatch;
                if (scriptObject != null) 
                {
                    Guid g = Guid.Empty;
                    string[] names = new string[] { methodName };
                    int[] dispids = new int[] { NativeMethods.ActiveX.DISPID_UNKNOWN }; 
                    int hr = scriptObject.GetIDsOfNames(ref g, names, 1,
                                                   SafeNativeMethods.GetThreadLCID(), dispids); 
                    if (NativeMethods.Succeeded(hr) && (dispids[0] != NativeMethods.ActiveX.DISPID_UNKNOWN)) 
                    {
                        // Reverse the arg order below so that parms are read properly thru IDispatch. (bug 187662) 
                        if (parameter != null)
                        {
                            // Reverse the parm order so that they read naturally after IDispatch. (bug 187662)
                            Array.Reverse(parameter); 
                        }
                        dp.rgvarg = (parameter == null) ? IntPtr.Zero : HtmlDocument.ArrayToVARIANTVector(parameter); 
                        dp.cArgs = (parameter == null) ? 0 : parameter.Length; 
                        dp.rgdispidNamedArgs = IntPtr.Zero;
                        dp.cNamedArgs = 0; 

                        object[] retVals = new object[1];

                        hr = scriptObject.Invoke(dispids[0], ref g, SafeNativeMethods.GetThreadLCID(), 
                                NativeMethods.DISPATCH_METHOD, dp,
                                retVals, new NativeMethods.tagEXCEPINFO(), null); 
                        if (hr == NativeMethods.S_OK) 
                        {
                            retVal = retVals[0]; 
                        }
                    }
                }
            } 
            catch (Exception ex)
            { 
                if (ClientUtils.IsSecurityOrCriticalException(ex)) 
                {
                    throw; 
                }
            }
            finally
            { 
                if (dp.rgvarg != IntPtr.Zero)
                { 
                    HtmlDocument.FreeVARIANTVector(dp.rgvarg, parameter.Length); 
                }
            } 
            return retVal;
        }

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public void RemoveFocus() 
        {
            ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).Blur();
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        // PM review done 
        [SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate")]
        public void RaiseEvent(string eventName)
        {
            ((UnsafeNativeMethods.IHTMLElement3)this.NativeHtmlElement).FireEvent(eventName, null); 
        }
 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void ScrollIntoView(bool alignWithTop)
        { 
            this.NativeHtmlElement.ScrollIntoView((object)alignWithTop);
        } 
 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public void SetAttribute(string attributeName, string value)
        { 
            try
            { 
                this.NativeHtmlElement.SetAttribute(attributeName, (object)value, 0); 
            }
            catch (COMException comException) 
            {
                if (comException.ErrorCode == unchecked((int)0x80020009))
                {
                    throw new NotSupportedException(SR.GetString(SR.HtmlElementAttributeNotSupported)); 
                }
                throw; 
            } 
        }
 

        //
        // Events:
        // 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler Click 
        {
            add
            {
                ElementShim.AddHandler(EventClick, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventClick, value);
            } 

        }

 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler DoubleClick 
        {
            add
            {
                ElementShim.AddHandler(EventDoubleClick, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventDoubleClick, value);
            } 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler Drag 
        {
            add 
            {
                ElementShim.AddHandler(EventDrag, value);
            }
            remove 
            {
                ElementShim.RemoveHandler(EventDrag, value); 
            } 
        }
 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler DragEnd 
        { 
            add
            { 
                ElementShim.AddHandler(EventDragEnd, value);
            }
            remove
            { 
                ElementShim.RemoveHandler(EventDragEnd, value);
            } 
        } 

 
        /// 
        /// 
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler DragLeave
        { 
            add 
            {
                ElementShim.AddHandler(EventDragLeave, value); 
            }
            remove
            {
                ElementShim.RemoveHandler(EventDragLeave, value); 
            }
 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public event HtmlElementEventHandler DragOver 
        {
            add 
            { 
                ElementShim.AddHandler(EventDragOver, value);
            } 
            remove
            {
                ElementShim.RemoveHandler(EventDragOver, value);
            } 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler Focusing
        {
            add 
            {
                ElementShim.AddHandler(EventFocusing, value); 
            } 
            remove
            { 
                ElementShim.RemoveHandler(EventFocusing, value);
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler GotFocus 
        {
            add
            {
                ElementShim.AddHandler(EventGotFocus, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventGotFocus, value);
            } 

        }

        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public event HtmlElementEventHandler LosingFocus
        { 
            add
            {
                ElementShim.AddHandler(EventLosingFocus, value);
            } 
            remove
            { 
                ElementShim.RemoveHandler(EventLosingFocus, value); 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler LostFocus 
        { 
            add
            { 
                ElementShim.AddHandler(EventLostFocus, value);
            }
            remove
            { 
                ElementShim.RemoveHandler(EventLostFocus, value);
            } 
        } 

        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public event HtmlElementEventHandler KeyDown 
        {
            add 
            { 
                ElementShim.AddHandler(EventKeyDown, value);
            } 
            remove
            {
                ElementShim.RemoveHandler(EventKeyDown, value);
            } 
        }
        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler KeyPress
        {
            add
            { 
                ElementShim.AddHandler(EventKeyPress, value);
            } 
            remove 
            {
                ElementShim.RemoveHandler(EventKeyPress, value); 
            }

        }
        ///  
        /// 
        ///    [To be supplied.] 
        ///  
        public event HtmlElementEventHandler KeyUp
        { 
            add
            {
                ElementShim.AddHandler(EventKeyUp, value);
            } 
            remove
            { 
                ElementShim.RemoveHandler(EventKeyUp, value); 
            }
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler MouseMove 
        { 
            add
            { 
                ElementShim.AddHandler(EventMouseMove, value);
            }
            remove
            { 
                ElementShim.RemoveHandler(EventMouseMove, value);
            } 
        } 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public event HtmlElementEventHandler MouseDown
        { 
            add
            { 
                ElementShim.AddHandler(EventMouseDown, value); 
            }
            remove 
            {
                ElementShim.RemoveHandler(EventMouseDown, value);
            }
        } 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public event HtmlElementEventHandler MouseOver 
        {
            add
            {
                ElementShim.AddHandler(EventMouseOver, value); 
            }
            remove 
            { 
                ElementShim.RemoveHandler(EventMouseOver, value);
            } 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public event HtmlElementEventHandler MouseUp 
        {
            add 
            {
                ElementShim.AddHandler(EventMouseUp, value);
            }
            remove 
            {
                ElementShim.RemoveHandler(EventMouseUp, value); 
            } 
        }
 
        /// 
        /// 
        ///    Fires when the mouse enters the element
        ///  
        public event HtmlElementEventHandler MouseEnter
        { 
            add 
            {
                ElementShim.AddHandler(EventMouseEnter, value); 
            }
            remove
            {
                ElementShim.RemoveHandler(EventMouseEnter, value); 
            }
        } 
 
        /// 
        ///  
        ///    Fires when the mouse leaves the element
        /// 
        public event HtmlElementEventHandler MouseLeave
        { 
            add
            { 
                ElementShim.AddHandler(EventMouseLeave, value); 
            }
            remove 
            {
                ElementShim.RemoveHandler(EventMouseLeave, value);
            }
        } 

        // 
        // Private classes: 
        //
        [ClassInterface(ClassInterfaceType.None)] 
        private class HTMLElementEvents2 : StandardOleMarshalObject, /*Enforce calling back on the same thread*/
                                           UnsafeNativeMethods.DHTMLElementEvents2,
                                           UnsafeNativeMethods.DHTMLAnchorEvents2,
                                           UnsafeNativeMethods.DHTMLAreaEvents2, 
                                           UnsafeNativeMethods.DHTMLButtonElementEvents2,
                                           UnsafeNativeMethods.DHTMLControlElementEvents2, 
                                           UnsafeNativeMethods.DHTMLFormElementEvents2, 
                                           UnsafeNativeMethods.DHTMLFrameSiteEvents2,
                                           UnsafeNativeMethods.DHTMLImgEvents2, 
                                           UnsafeNativeMethods.DHTMLInputFileElementEvents2,
                                           UnsafeNativeMethods.DHTMLInputImageEvents2,
                                           UnsafeNativeMethods.DHTMLInputTextElementEvents2,
                                           UnsafeNativeMethods.DHTMLLabelEvents2, 
                                           UnsafeNativeMethods.DHTMLLinkElementEvents2,
                                           UnsafeNativeMethods.DHTMLMapEvents2, 
                                           UnsafeNativeMethods.DHTMLMarqueeElementEvents2, 
                                           UnsafeNativeMethods.DHTMLOptionButtonElementEvents2,
                                           UnsafeNativeMethods.DHTMLSelectElementEvents2, 
                                           UnsafeNativeMethods.DHTMLStyleElementEvents2,
                                           UnsafeNativeMethods.DHTMLTableEvents2,
                                           UnsafeNativeMethods.DHTMLTextContainerEvents2,
                                           UnsafeNativeMethods.DHTMLScriptEvents2 
        {
 
            private HtmlElement parent; 

            public HTMLElementEvents2(HtmlElement htmlElement) 
            {
                this.parent = htmlElement;
            }
            private void FireEvent(object key, EventArgs e) 
            {
                if (this.parent != null) 
                { 
                    parent.ElementShim.FireEvent(key, e);
                } 
            }


            public bool onclick(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventClick, e); 
                return e.ReturnValue;
            } 

            public bool ondblclick(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDoubleClick, e);
                return e.ReturnValue; 
            } 

            public bool onkeypress(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventKeyPress, e);
                return e.ReturnValue; 
            }
 
            public void onkeydown(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventKeyDown, e);
            }

            public void onkeyup(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventKeyUp, e); 
            }
 
            public void onmouseover(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventMouseOver, e); 
            }
 
            public void onmousemove(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseMove, e);
            }

            public void onmousedown(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseDown, e); 
            }
 
            public void onmouseup(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventMouseUp, e); 
            }
 
            public void onmouseenter(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseEnter, e);
            }

            public void onmouseleave(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventMouseLeave, e); 
            }
 
            public bool onerrorupdate(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }
 
            public void onfocus(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventGotFocus, e);
            }

            public bool ondrag(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDrag, e); 
                return e.ReturnValue;
            } 

            public void ondragend(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDragEnd, e);
            } 
 
            public void ondragleave(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventDragLeave, e);
            }
 
            public bool ondragover(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                FireEvent(HtmlElement.EventDragOver, e);
                return e.ReturnValue; 
            }

            public void onfocusin(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventFocusing, e); 
            } 

            public void onfocusout(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventLosingFocus, e);
            } 

            public void onblur(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                FireEvent(HtmlElement.EventLostFocus, e); 
            }

            public void onresizeend(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onresizestart(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 

            public bool onhelp(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 
 
            public void onmouseout(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onselectstart(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }
 
            public void onfilterchange(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public bool ondragstart(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool onbeforeupdate(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public void onafterupdate(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onrowexit(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 

            public void onrowenter(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void ondatasetchanged(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void ondataavailable(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void ondatasetcomplete(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onlosecapture(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void onpropertychange(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onscroll(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onresize(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public bool ondragenter(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool ondrop(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public bool onbeforecut(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public bool oncut(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool onbeforecopy(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public bool oncopy(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public bool onbeforepaste(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public bool onpaste(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }

            public bool oncontextmenu(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public void onrowsdelete(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onrowsinserted(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void oncellchange(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onreadystatechange(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void onlayoutcomplete(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onpage(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void onactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void ondeactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onbeforedeactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            }

            public bool onbeforeactivate(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue; 
            }
 
            public void onmove(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public bool oncontrolselect(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            } 

            public bool onmovestart(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            } 

            public void onmoveend(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public bool onmousewheel(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue;
            }
 
            public bool onchange(UnsafeNativeMethods.IHTMLEventObj evtObj)
            { 
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            } 

            public void onselect(UnsafeNativeMethods.IHTMLEventObj evtObj) { }

            public void onload(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onerror(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void onabort(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public bool onsubmit(UnsafeNativeMethods.IHTMLEventObj evtObj)
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj);
                return e.ReturnValue; 
            }
 
            public bool onreset(UnsafeNativeMethods.IHTMLEventObj evtObj) 
            {
                HtmlElementEventArgs e = new HtmlElementEventArgs(parent.ShimManager, evtObj); 
                return e.ReturnValue;
            }

            public void onchange_void(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 

            public void onbounce(UnsafeNativeMethods.IHTMLEventObj evtObj) { } 
 
            public void onfinish(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
 
            public void onstart(UnsafeNativeMethods.IHTMLEventObj evtObj) { }
        }

 
        ///
        /// HtmlElementShim - this is the glue between the DOM eventing mechanisms 
        ///                    and our CLR callbacks. 
        ///
        ///     HTMLElementEvents2: we create an IConnectionPoint (via ConnectionPointCookie) between us and MSHTML and it calls back 
        ///                        on our an instance of HTMLElementEvents2.  The HTMLElementEvents2 class then fires the event.
        ///
        ///
        internal class HtmlElementShim : HtmlShim 
        {
 
            private static Type[] dispInterfaceTypes = {typeof(UnsafeNativeMethods.DHTMLElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLAnchorEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLAreaEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLButtonElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLControlElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLFormElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLFrameSiteEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLImgEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLInputFileElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLInputImageEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLInputTextElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLLabelEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLLinkElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLMapEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLMarqueeElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLOptionButtonElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLSelectElementEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLStyleElementEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLTableEvents2), 
                                                    typeof(UnsafeNativeMethods.DHTMLTextContainerEvents2),
                                                    typeof(UnsafeNativeMethods.DHTMLScriptEvents2)}; 

            private AxHost.ConnectionPointCookie cookie;   // To hook up events from the native HtmlElement
            private HtmlElement htmlElement;
            private UnsafeNativeMethods.IHTMLWindow2 associatedWindow = null; 

            public HtmlElementShim(HtmlElement element) 
            { 
                this.htmlElement = element;
 
                // snap our associated window so we know when to disconnect.
                if (this.htmlElement != null)
                {
                    HtmlDocument doc = this.htmlElement.Document; 
                    if (doc != null)
                    { 
                        HtmlWindow window = doc.Window; 
                        if (window != null)
                        { 
                            associatedWindow = window.NativeHtmlWindow;
                        }
                    }
                } 
            }
 
            public UnsafeNativeMethods.IHTMLElement NativeHtmlElement 
            {
                get { return htmlElement.NativeHtmlElement; } 
            }

            internal HtmlElement Element
            { 
                get { return htmlElement; }
            } 
 
            public override UnsafeNativeMethods.IHTMLWindow2 AssociatedWindow
            { 
                get { return associatedWindow; }
            }

            /// Support IHTMLElement2.AttachEventHandler 
            public override void AttachEventHandler(string eventName, System.EventHandler eventHandler)
            { 
 
                // IE likes to call back on an IDispatch of DISPID=0 when it has an event,
                // the HtmlToClrEventProxy helps us fake out the CLR so that we can call back on 
                // our EventHandler properly.

                HtmlToClrEventProxy proxy = AddEventProxy(eventName, eventHandler);
                bool success = ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).AttachEvent(eventName, proxy); 
                Debug.Assert(success, "failed to add event");
            } 
 
            public override void ConnectToEvents()
            { 
                if (cookie == null || !cookie.Connected)
                {
                    for (int i = 0; i < dispInterfaceTypes.Length && this.cookie == null; i++)
                    { 
                        this.cookie = new AxHost.ConnectionPointCookie(this.NativeHtmlElement,
                                                                                  new HTMLElementEvents2(htmlElement), 
                                                                                  dispInterfaceTypes[i], 
                                                                                  /*throwException*/ false);
                        if (!cookie.Connected) 
                        {
                            cookie = null;
                        }
                    } 
                }
            } 
 
            /// Support IHTMLElement2.DetachHandler
            public override void DetachEventHandler(string eventName, System.EventHandler eventHandler) 
            {
                HtmlToClrEventProxy proxy = RemoveEventProxy(eventHandler);
                if (proxy != null)
                { 
                    ((UnsafeNativeMethods.IHTMLElement2)this.NativeHtmlElement).DetachEvent(eventName, proxy);
                } 
            } 

 
            public override void DisconnectFromEvents()
            {
                if (this.cookie != null)
                { 
                    this.cookie.Disconnect();
                    this.cookie = null; 
                } 

            } 
            protected override void Dispose(bool disposing)
            {
                base.Dispose(disposing);
                if (htmlElement != null) 
                {
                    Marshal.FinalReleaseComObject(htmlElement.NativeHtmlElement); 
                } 
                htmlElement = null;
            } 

            protected override object GetEventSender()
            {
                return htmlElement; 
            }
 
        } 

            #region operators 
        /// 
        [SuppressMessage("Microsoft.Design", "CA1046:DoNotOverrideOperatorEqualsOnReferenceTypes")]
        public static bool operator ==(HtmlElement left, HtmlElement right)
        { 
            //Not equal if only one's null.
            if (object.ReferenceEquals(left, null) != object.ReferenceEquals(right, null)) 
            { 
                return false;
            } 

            //Equal if both are null.
            if (object.ReferenceEquals(left, null))
            { 
                return true;
            } 
 
            //Neither are null.  Get the IUnknowns and compare them.
            IntPtr leftPtr = IntPtr.Zero; 
            IntPtr rightPtr = IntPtr.Zero;
            try
            {
                leftPtr = Marshal.GetIUnknownForObject(left.NativeHtmlElement); 
                rightPtr = Marshal.GetIUnknownForObject(right.NativeHtmlElement);
                return leftPtr == rightPtr; 
            } 
            finally
            { 
                if (leftPtr != IntPtr.Zero)
                {
                    Marshal.Release(leftPtr);
                } 
                if (rightPtr != IntPtr.Zero)
                { 
                    Marshal.Release(rightPtr); 
                }
            } 
        }

        /// 
        public static bool operator !=(HtmlElement left, HtmlElement right) 
        {
            return !(left == right); 
        } 

        ///  
        public override int GetHashCode()
        {
            return htmlElement == null ? 0 : htmlElement.GetHashCode();
        } 

        ///  
        public override bool Equals(object obj) 
        {
            //If obj isn't an HtmlElement, we want Equals to return false.  this will 
            //never be null, so now it will return false as expected (not throw).
            return this == (obj as HtmlElement);
        }
            #endregion 

 
 
    }
 
    /// 
    /// 
    ///    [To be supplied.]
    ///  
    public enum HtmlElementInsertionOrientation
    { 
        ///  
        BeforeBegin,
        ///  
        AfterBegin,
        /// 
        BeforeEnd,
        ///  
        AfterEnd
    } 
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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