InteropAutomationProvider.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Automation / InteropAutomationProvider.cs / 1305600 / InteropAutomationProvider.cs
                        
                        
                            using System; 
using System.Windows;
using System.Windows.Automation.Peers;
using System.Windows.Automation.Provider;
 
using System.Security;
using System.Security.Permissions; 
 
using MS.Internal.PresentationCore;
 
namespace MS.Internal.Automation
{
    [FriendAccessAllowed] // Built into Core, also used by Framework.
    internal class InteropAutomationProvider: IRawElementProviderFragmentRoot 
    {
        #region Constructors 
 
        internal InteropAutomationProvider(HostedWindowWrapper wrapper, AutomationPeer parent)
        { 
            if (wrapper == null)
            {
                throw new ArgumentNullException("wrapper");
            } 
            if (parent == null)
            { 
                throw new ArgumentNullException("parent"); 
            }
 
            _wrapper = wrapper;
            _parent = parent;
        }
 
        #endregion Constructors
 
        #region IRawElementProviderSimple 

        /// 
        ProviderOptions IRawElementProviderSimple.ProviderOptions
        {
            get { return ProviderOptions.ServerSideProvider | ProviderOptions.OverrideProvider; }
        } 

        /// 
        object IRawElementProviderSimple.GetPatternProvider(int patternId) 
        {
            return null; 
        }

        ///
        object IRawElementProviderSimple.GetPropertyValue(int propertyId) 
        {
            return null; 
        } 

        ///  
        ///     Critical    - Calls critical HostedWindowWrapper.Handle.
        ///     TreatAsSafe - The reason is described in the following comment by BrendanM
        ///         HostProviderFromHandle is a public method the APTCA assembly UIAutomationProvider.dll;
        ///         ...\windows\AccessibleTech\longhorn\Automation\UIAutomationProvider\System\Windows\Automation\Provider\AutomationInteropProvider.cs 
        ///         This calls through to an internal P/Invoke layer...
        ///         ...\windows\AccessibleTech\longhorn\Automation\UIAutomationProvider\MS\Internal\Automation\UiaCoreProviderApi.cs 
        ///         Which P/Invokes to unmanaged UIAutomationCore.dll's UiaHostProviderFromHwnd API, 
        ///         ...\windows\AccessibleTech\longhorn\Automation\UnmanagedCore\UIAutomationCoreAPI.cpp
        ///         Which checks the HWND with IsWindow, and returns  a new MiniHwndProxy instance: 
        ///         ...\windows\AccessibleTech\longhorn\Automation\UnmanagedCore\MiniHwndProxy.cpp
        ///
        ///         MiniHwndProxy does implement the IRawElementProviderSimple interface, but all methods
        ///         return NULL or empty values; it does not expose any values or functionality through this. 
        ///         This object is designed to be an opaque cookie to contain the HWND so that only UIACore
        ///         itself can access it. UIACore accesses the HWND by QI'ing for a private GUID, and then 
        ///         casting the returnd value to MiniHwndProxy, and calling a nonvirtual method to access a 
        ///         _hwnd field. While managed PT code maybe able to do a QI, the only way it could extract
        ///         the _hwnd field would be by using unmanaged code. 
        /// 
        IRawElementProviderSimple IRawElementProviderSimple.HostRawElementProvider
        {
            [SecurityCritical, SecurityTreatAsSafe] 
            get
            { 
                return AutomationInteropProvider.HostProviderFromHandle(_wrapper.Handle); 
            }
        } 

        #endregion IRawElementProviderSimple

        #region IRawElementProviderFragment 

        ///  
        ///     TreatAsSafe - The reason this method can be treated as safe is because it yeilds information 
        ///         about the parent provider which can even otherwise be obtained by using public APIs such
        ///         as UIElement.OnCreateAutomationPeer and AutomationProvider.ProviderFromPeer. 
        /// 
        IRawElementProviderFragment IRawElementProviderFragment.Navigate(NavigateDirection direction)
        {
            if (direction == NavigateDirection.Parent) 
            {
                return (IRawElementProviderFragment)_parent.ProviderFromPeer(_parent); 
            } 

            return null; 
        }

        ///
        int [] IRawElementProviderFragment.GetRuntimeId() 
        {
            return null; 
        } 

        /// 
        Rect IRawElementProviderFragment.BoundingRectangle
        {
            get { return Rect.Empty; }
        } 

        /// 
        IRawElementProviderSimple [] IRawElementProviderFragment.GetEmbeddedFragmentRoots() 
        {
            return null; 
        }

        ///
        void IRawElementProviderFragment.SetFocus() 
        {
            throw new NotSupportedException(); 
        } 

        /// 
        IRawElementProviderFragmentRoot IRawElementProviderFragment.FragmentRoot
        {
            get { return null; }
        } 

        #endregion IRawElementProviderFragment 
 
        #region IRawElementProviderFragmentRoot
 
        ///
        IRawElementProviderFragment IRawElementProviderFragmentRoot.ElementProviderFromPoint( double x, double y )
        {
            return null; 
        }
 
        /// 
        IRawElementProviderFragment IRawElementProviderFragmentRoot.GetFocus()
        { 
            return null;
        }

        #endregion IRawElementProviderFragmentRoot 

        #region Data 
 
        private HostedWindowWrapper         _wrapper;
        private AutomationPeer              _parent; 

        #endregion Data
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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InteropAutomationProvider.cs source code in C# .NET

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