ActiveXContainer.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / Controls / ActiveXContainer.cs / 1 / ActiveXContainer.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
//
// Description: Implements ActiveXContainer interfaces to host 
//              ActiveX controls 
//
//              Source copied from AxContainer.cs 
//
// History
//  04/17/05    [....]      Created
// 
//-----------------------------------------------------------------------------
 
using System; 
using System.Collections;
using System.Diagnostics; 
using Microsoft.Win32;

using System.Windows.Interop;
using MS.Win32; 
using System.Security ;
 
namespace MS.Internal.Controls 
{
    #region class ActiveXContainer 

    //This implements the basic container interfaces. Other siting related interfaces are
    //implemented on the ActiveXSite object e.g. IOleClientSite, IOleInPlaceSite, IOleControlSite etc.
 
    internal class ActiveXContainer : UnsafeNativeMethods.IOleContainer, UnsafeNativeMethods.IOleInPlaceFrame
    { 
        #region Constructor 

        /// 
        ///     Critical - accesses critical _host member.
        ///
        [ SecurityCritical ]
        internal ActiveXContainer(ActiveXHost host) 
        {
            this._host = host; 
 
            Invariant.Assert(_host != null);
        } 

        #endregion Constructor

        //----------------------------------------------------- 
        //
        //  Internal Methods 
        // 
        //-----------------------------------------------------
 
        #region Internal Methods

        #region IOleContainer
 
        //
        // IOleContainer methods: 
        // 
        int UnsafeNativeMethods.IOleContainer.ParseDisplayName(Object pbc, string pszDisplayName, int[] pchEaten, Object[] ppmkOut)
        { 
            if (ppmkOut != null)
                ppmkOut[0] = null;

            return NativeMethods.E_NOTIMPL; 
        }
 
        /// 
        ///     Critical - calls _host.ActiveXInstance
        /// 
        [SecurityCritical]
        int UnsafeNativeMethods.IOleContainer.EnumObjects(int grfFlags, out UnsafeNativeMethods.IEnumUnknown ppenum)
        {
            ppenum = null; 

            Debug.Assert(_host != null, "gotta have the avalon activex host"); 
 
            object ax = _host.ActiveXInstance;
 
            //We support only one control, return that here
            //How does one add multiple controls to a container?
            if (ax != null
                && 
                ( ((grfFlags & NativeMethods.OLECONTF_EMBEDDINGS) != 0)
                  || 
                  ((grfFlags & NativeMethods.OLECONTF_ONLYIFRUNNING) != 0 && 
                    _host.ActiveXState == ActiveXHelper.ActiveXState.Running )) )
            { 
                Object[] temp = new Object[1];
                temp[0]= ax;
                ppenum = new EnumUnknown(temp);
                return NativeMethods.S_OK; 
            }
 
            ppenum = new EnumUnknown(null); 
            return NativeMethods.S_OK;
        } 

        int UnsafeNativeMethods.IOleContainer.LockContainer(bool fLock)
        {
            return NativeMethods.E_NOTIMPL; 
        }
 
        #endregion IOleContainer 

        #region IOleInPlaceFrame 

        //
        // IOleInPlaceFrame methods:
        // 

        /// 
        ///     Critical - accesses critical _host member. 
        ///
        [SecurityCritical] 
        IntPtr UnsafeNativeMethods.IOleInPlaceFrame.GetWindow()
        {
            return _host.ParentHandle.Handle;
        } 

        int UnsafeNativeMethods.IOleInPlaceFrame.ContextSensitiveHelp(int fEnterMode) 
        { 
            return NativeMethods.S_OK;
        } 

        int UnsafeNativeMethods.IOleInPlaceFrame.GetBorder(NativeMethods.COMRECT lprectBorder)
        {
            return NativeMethods.E_NOTIMPL; 
        }
 
        int UnsafeNativeMethods.IOleInPlaceFrame.RequestBorderSpace(NativeMethods.COMRECT pborderwidths) 
        {
            return NativeMethods.E_NOTIMPL; 
        }

        int UnsafeNativeMethods.IOleInPlaceFrame.SetBorderSpace(NativeMethods.COMRECT pborderwidths)
        { 
            return NativeMethods.E_NOTIMPL;
        } 
 
        int UnsafeNativeMethods.IOleInPlaceFrame.SetActiveObject(UnsafeNativeMethods.IOleInPlaceActiveObject pActiveObject, string pszObjName)
        { 
            //Winforms has code to remove selection handler around the active object
            //and add it around the new one
            //
            //Since we don't have anything like that in Avalon, we do nothing 
            //
            //For future reference, added skeletal code on how to get to the internal hosting 
            //objects incase they are needed here. 

 
            /*
            ActiveXHost host = null;

            if (pActiveObject is UnsafeNativeMethods.IOleObject) 
            {
                UnsafeNativeMethods.IOleObject oleObject = (UnsafeNativeMethods.IOleObject)pActiveObject; 
                UnsafeNativeMethods.IOleClientSite clientSite = null; 

                try 
                {
                    clientSite = oleObject.GetClientSite();
                    if ((clientSite as ActiveXSite) != null)
                    { 
                        ctl = ((ActiveXSite)(clientSite)).GetActiveXHost();
                    } 
                } 
                catch (COMException t)
                { 
                    Debug.Fail(t.ToString());
                }
            }
            */ 

            return NativeMethods.S_OK; 
        } 

        int UnsafeNativeMethods.IOleInPlaceFrame.InsertMenus(IntPtr hmenuShared, NativeMethods.tagOleMenuGroupWidths lpMenuWidths) 
        {
            return NativeMethods.S_OK;
        }
 
        int UnsafeNativeMethods.IOleInPlaceFrame.SetMenu(IntPtr hmenuShared, IntPtr holemenu, IntPtr hwndActiveObject)
        { 
            return NativeMethods.E_NOTIMPL; 
        }
 
        int UnsafeNativeMethods.IOleInPlaceFrame.RemoveMenus(IntPtr hmenuShared)
        {
            return NativeMethods.E_NOTIMPL;
        } 

        int UnsafeNativeMethods.IOleInPlaceFrame.SetStatusText(string pszStatusText) 
        { 
            return NativeMethods.E_NOTIMPL;
        } 

        int UnsafeNativeMethods.IOleInPlaceFrame.EnableModeless(bool fEnable)
        {
            return NativeMethods.E_NOTIMPL; 
        }
 
        int UnsafeNativeMethods.IOleInPlaceFrame.TranslateAccelerator(ref MSG lpmsg, short wID) 
        {
            return NativeMethods.S_FALSE; 
        }

        #endregion IOleInPlaceFrame
 
        ///
        ///     Critical - calls ActiveXHost. 
        ///     TreatAsSafe - transitioning to UIActive is ok. 
        ///
        [ SecurityCritical, SecurityTreatAsSafe ] 
        internal void OnUIActivate(ActiveXHost site)
        {
            // The ShDocVw control repeatedly calls OnUIActivate() with the same
            // site. This causes the assert below to fire. 
            //
            if (_siteUIActive == site) 
                return; 

            if (_siteUIActive != null ) 
            {
                //Winforms WebOC also uses ActiveXHost instead of ActiveXSite.
                //Ideally it should have been the site but since its a 1-1 relationship
                //for hosting the webOC, it will work 
                ActiveXHost tempSite = _siteUIActive;
                tempSite.ActiveXInPlaceObject.UIDeactivate(); 
            } 
            Debug.Assert(_siteUIActive == null, "Object did not call OnUIDeactivate");
            _siteUIActive = site; 

            //
        }
 
        ///
        ///     Critical - calls ActiveXHost. 
        ///     TreatAsSafe - transitioning away from UI-Active is ok. 
        ///
        [SecurityCritical, SecurityTreatAsSafe ] 
        internal void OnUIDeactivate(ActiveXHost site)
        {
#if DEBUG
            if (_siteUIActive != null) { 
                //
                Debug.Assert(this.ActiveXHost == site, "deactivating when not active..."); 
            } 
#endif // DEBUG
 
            //


            _siteUIActive = null; 
        }
 
        /// 
        ///     Critical - accesses critical data.
        ///     TreatAsSafe - Transitioning away from in-place is ok. 
        ///                   Clearing the active site is ok.
        ///
        [ SecurityCritical, SecurityTreatAsSafe ]
        internal void OnInPlaceDeactivate(ActiveXHost site) 
        {
            // 
            if (this.ActiveXHost == site) 
            {
            } 
        }

        #endregion Internal Methods
 
        //------------------------------------------------------
        // 
        //  Internal Properties 
        //
        //----------------------------------------------------- 
        #region Internal Properties

        ///
        ///     Critical - accesses critical _host member. 
        ///
        internal ActiveXHost ActiveXHost 
        { 
            [ SecurityCritical ]
            get { return _host; } 
        }

        #endregion Internal Properties
 
        //------------------------------------------------------
        // 
        //  Private Fields 
        //
        //------------------------------------------------------ 
        #region Private Fields

        ///
        ///     Critical - data - ptr. to control. 
        ///
        [ SecurityCritical ] 
        private ActiveXHost _host; 

 
        ///
        ///     Critical - data - ptr. to control.
        ///
        [ SecurityCritical ] 
        private ActiveXHost _siteUIActive;
 
        #endregion Private Fields 
    }
 
    #endregion class ActiveXContainer
}

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