MSHTMLHost.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WebForms / System / Web / UI / Design / Util / MSHTMLHost.cs / 1 / MSHTMLHost.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

// MSHTMLHost.cs 
// 
// 12/17/98: Created: [....]
// 

namespace System.Web.UI.Design.Util {

    using Microsoft.Win32; 
    using System;
    using System.ComponentModel; 
    using System.Design; 
    using System.Diagnostics;
    using System.Runtime.InteropServices; 
    using System.Runtime.Serialization.Formatters;
    using System.Windows.Forms;

    using IComDataObject = System.Runtime.InteropServices.ComTypes.IDataObject; 

    ///  
    ///  
    ///    Control that hosts a Trident DocObject.
    ///  
    /// 
    //

 
    [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
    internal sealed class MSHTMLHost : Control { 
        private TridentSite tridentSite; 

        public MSHTMLHost() : base() { 
        }

        public NativeMethods.IHTMLDocument2 GetDocument() {
            Debug.Assert(tridentSite != null, 
                         "Cannot call getDocument before calling createTrident");
 
            return tridentSite.GetDocument(); 
        }
 
        protected override CreateParams CreateParams {
             get {
                CreateParams cp = base.CreateParams;
 
                cp.ExStyle |= NativeMethods.WS_EX_STATICEDGE;
                return cp; 
            } 
        }
 
        public bool CreateTrident() {
            Debug.Assert(Handle != IntPtr.Zero,
                         "MSHTMLHost must first be created before createTrident is called");
 
            try {
                tridentSite = new TridentSite(this); 
            } 
            catch (Exception e) {
                Debug.WriteLine("Exception caught in MSHTMLHost::CreateTrident\n\t" + e.ToString()); 
                return false;
            }
            return true;
        } 

        public void ActivateTrident() { 
            Debug.Assert(tridentSite != null, 
                         "cannot call activateTrident before calling createTrident");
 
            tridentSite.Activate();
        }
    }
 

    ///  
    ///  
    ///    Implements the client site for Trident DocObject
    ///  
    [ClassInterface(ClassInterfaceType.None)]
    internal class TridentSite : NativeMethods.IOleClientSite, NativeMethods.IOleDocumentSite, NativeMethods.IOleInPlaceSite, NativeMethods.IOleInPlaceFrame, NativeMethods.IDocHostUIHandler {

        protected Control parentControl; 
        protected NativeMethods.IOleDocumentView tridentView;
        protected NativeMethods.IOleObject tridentOleObject; 
        protected NativeMethods.IHTMLDocument2 tridentDocument; 

        protected EventHandler resizeHandler; 

        public TridentSite(Control parent) {
            Debug.Assert((parent != null) && (parent.Handle != IntPtr.Zero),
                         "Invalid control passed in as parent of Trident window"); 

            parentControl = parent; 
            resizeHandler = new EventHandler(this.OnParentResize); 
            parentControl.Resize += resizeHandler;
 
            CreateDocument();
        }

        public NativeMethods.IHTMLDocument2 GetDocument() { 
            return tridentDocument;
        } 
 
        public void Activate() {
            ActivateDocument(); 
        }

        protected virtual void OnParentResize(object src, EventArgs e) {
            if (tridentView != null) { 
                NativeMethods.COMRECT r = new NativeMethods.COMRECT();
 
                NativeMethods.GetClientRect(parentControl.Handle, r); 
                tridentView.SetRect(r);
            } 
        }


        /////////////////////////////////////////////////////////////////////////// 
        // IOleClientSite Implementation
 
        public virtual void SaveObject() { 
        }
 
        public virtual object GetMoniker(int dwAssign, int dwWhichMoniker) {
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL);
        }
 
        public virtual int GetContainer(out NativeMethods.IOleContainer ppContainer) {
            ppContainer = null; 
            return NativeMethods.E_NOINTERFACE; 
        }
 
        public virtual void ShowObject() {
        }

        public virtual void OnShowWindow(int fShow) { 
        }
 
        public virtual void RequestNewObjectLayout() { 
        }
 

        ///////////////////////////////////////////////////////////////////////////
        // IOleDocumentSite Implementation
 
        public virtual int ActivateMe(NativeMethods.IOleDocumentView pViewToActivate) {
            Debug.Assert(pViewToActivate != null, 
                         "Expected the view to be non-null"); 
            if (pViewToActivate == null)
                return NativeMethods.E_INVALIDARG; 

            NativeMethods.COMRECT r = new NativeMethods.COMRECT();

            NativeMethods.GetClientRect(parentControl.Handle, r); 

            tridentView = pViewToActivate; 
            tridentView.SetInPlaceSite((NativeMethods.IOleInPlaceSite)this); 
            tridentView.UIActivate(1);
            tridentView.SetRect(r); 
            tridentView.Show(1);

            return NativeMethods.S_OK;
        } 

 
        /////////////////////////////////////////////////////////////////////////// 
        // IOleInPlaceSite Implementation
 
        public virtual IntPtr GetWindow() {
            return parentControl.Handle;
        }
 
        public virtual void ContextSensitiveHelp(int fEnterMode) {
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL); 
        } 

        public virtual int CanInPlaceActivate() { 
            return NativeMethods.S_OK;
        }

        public virtual void OnInPlaceActivate() { 
        }
 
        public virtual void OnUIActivate() { 
        }
 
        public virtual void GetWindowContext(out NativeMethods.IOleInPlaceFrame ppFrame, out NativeMethods.IOleInPlaceUIWindow ppDoc, NativeMethods.COMRECT lprcPosRect, NativeMethods.COMRECT lprcClipRect, NativeMethods.tagOIFI lpFrameInfo) {

            ppFrame = (NativeMethods.IOleInPlaceFrame)this;
            ppDoc = null; 

            NativeMethods.GetClientRect(parentControl.Handle, lprcPosRect); 
            NativeMethods.GetClientRect(parentControl.Handle, lprcClipRect); 

            lpFrameInfo.cb = System.Runtime.InteropServices.Marshal.SizeOf(typeof(NativeMethods.tagOIFI)); 
            lpFrameInfo.fMDIApp = 0;
            lpFrameInfo.hwndFrame = parentControl.Handle;
            lpFrameInfo.hAccel = IntPtr.Zero;
            lpFrameInfo.cAccelEntries = 0; 
        }
 
        public virtual int Scroll(NativeMethods.tagSIZE scrollExtant) { 
            return(NativeMethods.E_NOTIMPL);
        } 

        public virtual void OnUIDeactivate(int fUndoable) {
            // NOTE, [....], 7/99: Don't return E_NOTIMPL. Somehow doing nothing and returning S_OK
            //    fixes trident hosting in Win2000. 
        }
 
        public virtual void OnInPlaceDeactivate() { 
        }
 
        public virtual void DiscardUndoState() {
            throw new COMException("Not implemented", NativeMethods.E_NOTIMPL);
        }
 
        public virtual void DeactivateAndUndo() {
        } 
 
        public virtual int OnPosRectChange(NativeMethods.COMRECT lprcPosRect) {
            return NativeMethods.S_OK; 
        }


        /////////////////////////////////////////////////////////////////////////// 
        // IOleInPlaceFrame Implementation
 
        public virtual void GetBorder(NativeMethods.COMRECT lprectBorder) { 
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL);
        } 

        public virtual void RequestBorderSpace(NativeMethods.COMRECT pborderwidths) {
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL);
        } 

        public virtual void SetBorderSpace(NativeMethods.COMRECT pborderwidths) { 
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL); 
        }
 
        public virtual void SetActiveObject(NativeMethods.IOleInPlaceActiveObject pActiveObject, string pszObjName) {
            // NOTE, [....], 7/99: Don't return E_NOTIMPL. Somehow doing nothing and returning S_OK
            //    fixes trident hosting in Win2000.
            // throw new COMException(String.Empty, NativeMethods.E_NOTIMPL); 
        }
 
        public virtual void InsertMenus(IntPtr hmenuShared, object lpMenuWidths) { 
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL);
        } 

        public virtual void SetMenu(IntPtr hmenuShared, IntPtr holemenu, IntPtr hwndActiveObject) {
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL);
        } 

        public virtual void RemoveMenus(IntPtr hmenuShared) { 
            throw new COMException(String.Empty, NativeMethods.E_NOTIMPL); 
        }
 
        public virtual void SetStatusText(string pszStatusText) {
        }

        public virtual void EnableModeless(int fEnable) { 
        }
 
        public virtual int TranslateAccelerator(ref NativeMethods.MSG lpmsg, short wID) { 
            return NativeMethods.S_FALSE;
        } 


        ///////////////////////////////////////////////////////////////////////////
        // IDocHostUIHandler Implementation 

        public virtual int ShowContextMenu(int dwID, NativeMethods.POINT pt, object pcmdtReserved, object pdispReserved) { 
            return NativeMethods.S_OK; 
        }
 
        public virtual int GetHostInfo(NativeMethods.DOCHOSTUIINFO info) {
            info.dwDoubleClick = NativeMethods.DOCHOSTUIDBLCLICK.DEFAULT;
            info.dwFlags = NativeMethods.DOCHOSTUIFLAG.FLAT_SCROLLBAR |
                           NativeMethods.DOCHOSTUIFLAG.NO3DBORDER | 
                           NativeMethods.DOCHOSTUIFLAG.DIALOG |
                           NativeMethods.DOCHOSTUIFLAG.DISABLE_SCRIPT_INACTIVE; 
 
            return NativeMethods.S_OK;
        } 

        public virtual int EnableModeless(bool fEnable) {
            return NativeMethods.S_OK;
        } 

        public virtual int ShowUI(int dwID, NativeMethods.IOleInPlaceActiveObject activeObject, NativeMethods.IOleCommandTarget commandTarget, NativeMethods.IOleInPlaceFrame frame, NativeMethods.IOleInPlaceUIWindow doc) { 
            return NativeMethods.S_OK; 
        }
 
        public virtual int HideUI() {
            return NativeMethods.S_OK;
        }
 
        public virtual int UpdateUI() {
            return NativeMethods.S_OK; 
        } 

        public virtual int OnDocWindowActivate(bool fActivate) { 
            return NativeMethods.E_NOTIMPL;
        }

        public virtual int OnFrameWindowActivate(bool fActivate) { 
            return NativeMethods.E_NOTIMPL;
        } 
 
        public virtual int ResizeBorder(NativeMethods.COMRECT rect, NativeMethods.IOleInPlaceUIWindow doc, bool fFrameWindow) {
            return NativeMethods.E_NOTIMPL; 
        }

        public virtual int GetOptionKeyPath(string[] pbstrKey, int dw) {
            pbstrKey[0] = null; 
            return NativeMethods.S_OK;
        } 
 
        public virtual int GetDropTarget(NativeMethods.IOleDropTarget pDropTarget, out NativeMethods.IOleDropTarget ppDropTarget) {
            ppDropTarget = null; 
            return NativeMethods.S_FALSE;
        }

        public virtual int GetExternal(out object ppDispatch) { 
            ppDispatch = null;
            return NativeMethods.S_OK; 
        } 

        public virtual int TranslateAccelerator(ref NativeMethods.MSG msg, ref Guid group, int nCmdID) { 
            return NativeMethods.S_OK;
        }

        public virtual int TranslateUrl(int dwTranslate, string strUrlIn, out string pstrUrlOut) { 
            pstrUrlOut = null;
            return NativeMethods.E_NOTIMPL; 
        } 

        public virtual int FilterDataObject(IComDataObject pDO, out IComDataObject ppDORet) { 
            ppDORet = null;
            return NativeMethods.S_OK;
        }
 

        /////////////////////////////////////////////////////////////////////////// 
        // Implementation 

        ///  
        /// 
        ///     Creates a new instance of mshtml and initializes it as a new document
        ///     using its IPersistStreamInit.
        ///  
        protected void CreateDocument() {
 
            try { 
                // Create an instance of Trident
                tridentDocument = (NativeMethods.IHTMLDocument2)new NativeMethods.HTMLDocument(); 
                tridentOleObject = (NativeMethods.IOleObject)tridentDocument;

                // Initialize its client site
                tridentOleObject.SetClientSite((NativeMethods.IOleClientSite)this); 

                // Initialize it 
                NativeMethods.IPersistStreamInit psi = (NativeMethods.IPersistStreamInit)tridentDocument; 
                psi.InitNew();
            } 
            catch (Exception e) {
                Debug.Fail(e.ToString());
                throw e;
            } 
        }
 
        ///  
        /// 
        ///     Activates the mshtml instance 
        /// 
        protected void ActivateDocument() {
            Debug.Assert(tridentOleObject != null,
                         "How'd we get here when trident is null!"); 

            try { 
                NativeMethods.COMRECT r = new NativeMethods.COMRECT(); 

                NativeMethods.GetClientRect(parentControl.Handle, r); 
                tridentOleObject.DoVerb(NativeMethods.OLEIVERB_UIACTIVATE, IntPtr.Zero, (NativeMethods.IOleClientSite)this, 0, parentControl.Handle, r);
            }
            catch (Exception e) {
                Debug.Fail(e.ToString()); 
            }
        } 
    } 
}
 

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