Automation.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / UIAutomation / UIAutomationClient / System / Windows / Automation / Automation.cs / 1 / Automation.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Facade class that groups together the main functionality that clients need to get started. 
//
// History: 
//  06/02/2003 : BrendanM Ported to WCP
//  07/23/2003 : MKarr removed start and includeStart from FindRawElement and FindLogicalElement
//
//--------------------------------------------------------------------------- 

// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas. 
#pragma warning disable 1634, 1691 

using System.Windows.Automation; 
using System.Windows.Automation.Provider;
using System;
using System.Runtime.InteropServices;
using System.Security.Permissions; 
using System.Reflection;
using System.Diagnostics; 
using MS.Internal.Automation; 
using MS.Win32;
 
namespace System.Windows.Automation
{
    /// 
    /// Class containing client Automation methods that are not specific to a particular element 
    /// 
#if (INTERNAL_COMPILE) 
    internal static class Automation 
#else
    public static class Automation 
#endif
    {

        //----------------------------------------------------- 
        //
        //  Public Constants / Readonly Fields 
        // 
        //-----------------------------------------------------
 
        #region Public Constants and Readonly Fields

        /// Condition that describes the Raw view of the UIAutomation tree
        public static readonly Condition RawViewCondition = Condition.TrueCondition; 

        /// Condition that describes the Control view of the UIAutomation tree 
        public static readonly Condition ControlViewCondition = new NotCondition( 
                                            new PropertyCondition( AutomationElement.IsControlElementProperty, false) );
        // 


        /// Condition that describes the Content view of the UIAutomation tree
        public static readonly Condition ContentViewCondition = new NotCondition( new OrCondition( 
                                            new PropertyCondition( AutomationElement.IsControlElementProperty, false),
                                            new PropertyCondition( AutomationElement.IsContentElementProperty, false))); 
 
        #endregion Public Constants and Readonly Fields
 

        //------------------------------------------------------
        //
        //  Public Methods 
        //
        //----------------------------------------------------- 
 

        #region Public Methods 

        #region Element Comparisons
        /// 
        /// Compares two elements, returning true if both refer to the same piece of UI. 
        /// 
        /// element to compare 
        /// element to compare 
        /// true if el1 and el2 refer to the same underlying UI
        /// Both el1 and el1 must be non-null 
        ///
        /// 
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static bool Compare(AutomationElement el1, AutomationElement el2) 
        { 
            return Misc.Compare(el1, el2);
        } 

        /// 
        /// Compares two integer arrays, returning true if they have the same contents
        ///  
        /// integer array to compare
        /// integer array to compare 
        /// true if runtimeId1 and runtimeId2 refer to the same underlying UI 
        /// Both runtimeId1 and runtimeId2 must be non-null. Can be
        /// used to compare RuntimeIds from elements. 
        ///
        /// 
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static bool Compare(int[] runtimeId1, int[] runtimeId2) 
        { 
            return Misc.Compare(runtimeId1, runtimeId2);
        } 
        #endregion Element Comparisons

        #region Misc: Find, Property Names
        ///  
        /// Get string describing specified property idenfier
        ///  
        /// property to get string for 
        /// Sting containing human-readable name of specified property
        public static string PropertyName( AutomationProperty property ) 
        {
            Misc.ValidateArgumentNonNull(property, "property");
            // Suppress PRESHARP Parameter to this public method must be validated; element is checked above.
#pragma warning suppress 56506 
            string full = property.ProgrammaticName.Split('.')[1]; // remove portion before the ".", leaving just "NameProperty" or similar
            return full.Substring(0, full.Length - 8); // Slice away "Property" suffix 
        } 

        ///  
        /// Get string describing specified pattern idenfier
        /// 
        /// pattern to get string for
        /// Sting containing human-readable name of specified pattern 
        public static string PatternName( AutomationPattern pattern )
        { 
            Misc.ValidateArgumentNonNull(pattern, "pattern"); 
            // Suppress PRESHARP Parameter to this public method must be validated; element is checked above.
#pragma warning suppress 56506 
            string full = pattern.ProgrammaticName;
            return full.Substring(0, full.Length - 26); // Slice away "InvokePatternIdentifiers.Pattern" to get just "Invoke"
        }
        #endregion Misc: Find, Property Names 

        #region Events 
        ///  
        /// Called by a client to add a listener for pattern or custom events.
        ///  
        /// A control pattern or custom event identifier.
        /// Element on which to listen for control pattern or custom events.
        /// Specifies whether to listen to property changes events on the specified element, and/or its ancestors and children.
        /// Delegate to call when the specified event occurs. 
        ///
        ///  
        /// This API does not work inside the secure execution environment. 
        /// 
        ///  
        public static void AddAutomationEventHandler(
            AutomationEvent eventId,
            AutomationElement element,
            TreeScope scope, 
            AutomationEventHandler eventHandler
            ) 
        { 
            Misc.ValidateArgumentNonNull(element, "element" );
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" ); 
            Misc.ValidateArgument( eventId != AutomationElement.AutomationFocusChangedEvent, SRID.EventIdMustNotBeAutomationFocusChanged );
            Misc.ValidateArgument( eventId != AutomationElement.StructureChangedEvent,SRID.EventIdMustNotBeStructureChanged );
            Misc.ValidateArgument( eventId != AutomationElement.AutomationPropertyChangedEvent, SRID.EventIdMustNotBeAutomationPropertyChanged );
 
            if (eventId == WindowPattern.WindowClosedEvent)
            { 
                // Once a window closes and the hwnd is destroyed we won't be able to determine where it was in the 
                // Automation tree; therefore only support WindowClosed events for all windows (eg. src==root and scope
                // is descendants) or a specific WindowPattern element (src==root of a Window and scope is the element). 
                // Also handle odd combinations (eg. src==specific element and scope is subtree|ancestors).

                bool paramsValidated = false;
 
                if ( Misc.Compare( element, AutomationElement.RootElement ) )
                { 
                    // For root element need to have Descendants scope set (Note: Subtree includes Descendants) 
                    if ( ( scope & TreeScope.Descendants ) == TreeScope.Descendants )
                    { 
                        paramsValidated = true;
                    }
                }
                else 
                {
                    // otherwise non-root elements must have the entire tree (Anscestors, Element and Descendants)... 
                    if ( ( scope & ( TreeScope.Ancestors | TreeScope.Element | TreeScope.Descendants ) ) == ( TreeScope.Ancestors | TreeScope.Element | TreeScope.Descendants ) ) 
                    {
                        paramsValidated = true; 
                    }
                    else if ( ( scope & TreeScope.Element ) == TreeScope.Element )
                    {
                        // ...OR Element where the element implements WindowPattern 
                        // PRESHARP will flag this as warning 56506/6506:Parameter 'element' to this public method must be validated: A null-dereference can occur here.
                        // False positive, element is checked, see above 
#pragma warning suppress 6506 
                        object val = element.GetCurrentPropertyValue(AutomationElement.NativeWindowHandleProperty);
                        if ( val != null && val is int && (int)val != 0 ) 
                        {
                            if ( HwndProxyElementProvider.IsWindowPatternWindow( NativeMethods.HWND.Cast( new IntPtr( (int)val ) ) ) )
                            {
                                paramsValidated = true; 
                            }
                        } 
                    } 
                }
 
                if ( !paramsValidated )
                {
                    throw new ArgumentException( SR.Get( SRID.ParamsNotApplicableToWindowClosedEvent ) );
                } 
            }
 
            // Add a client-side Handler for for this event request 
            EventListener l = new EventListener(eventId, scope, null, CacheRequest.CurrentUiaCacheRequest);
            ClientEventManager.AddListener(element, eventHandler, l); 
        }


        ///  
        /// Called by a client to remove a listener for pattern or custom events.
        ///  
        /// a UIAccess or custom event identifier. 
        /// Element to remove listener for
        /// The handler object that was passed to AddEventListener 
        ///
        /// 
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static void RemoveAutomationEventHandler( 
            AutomationEvent eventId, 
            AutomationElement element,
            AutomationEventHandler eventHandler 
            )
        {
            Misc.ValidateArgumentNonNull(element, "element" );
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" ); 
            Misc.ValidateArgument( eventId != AutomationElement.AutomationFocusChangedEvent, SRID.EventIdMustNotBeAutomationFocusChanged );
            Misc.ValidateArgument( eventId != AutomationElement.StructureChangedEvent, SRID.EventIdMustNotBeStructureChanged ); 
            Misc.ValidateArgument( eventId != AutomationElement.AutomationPropertyChangedEvent, SRID.EventIdMustNotBeAutomationPropertyChanged ); 

            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read ); 

            // Remove the client-side listener for for this event
            ClientEventManager.RemoveListener( eventId, element, eventHandler );
        } 

        ///  
        /// Called by a client to add a listener for property changed events. 
        /// 
        /// Element on which to listen for property changed events. 
        /// Specifies whether to listen to property changes events on the specified element, and/or its ancestors and children.
        /// Callback object to call when a specified property change occurs.
        /// Params array of properties to listen for changes in.
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        ///  
        /// 
        public static void AddAutomationPropertyChangedEventHandler( 
            AutomationElement element,            // reference element for listening to the event
            TreeScope scope,                   // scope to listen to
            AutomationPropertyChangedEventHandler eventHandler,    // callback object
            params AutomationProperty [] properties           // listen for changes to these properties 
            )
        { 
            Misc.ValidateArgumentNonNull(element, "element" ); 
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" );
            Misc.ValidateArgumentNonNull(properties, "properties" ); 
            if (properties.Length == 0)
            {
                throw new ArgumentException( SR.Get(SRID.AtLeastOnePropertyMustBeSpecified) );
            } 

            // Check that no properties are interpreted properties 
            // 

            foreach (AutomationProperty property in properties) 
            {
                Misc.ValidateArgumentNonNull(property, "properties" );
            }
 
            // Add a client-side listener for for this event request
            EventListener l = new EventListener(AutomationElement.AutomationPropertyChangedEvent, scope, properties, CacheRequest.CurrentUiaCacheRequest); 
            ClientEventManager.AddListener(element, eventHandler, l); 
        }
 
        /// 
        /// Called by a client to remove a listener for property changed events.
        /// 
        /// Element to remove listener for 
        /// The handler object that was passed to AutomationPropertyChangedEventHandler
        /// 
        ///  
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static void RemoveAutomationPropertyChangedEventHandler(
            AutomationElement element,            // reference element being listened to
            AutomationPropertyChangedEventHandler eventHandler     // callback object (used as cookie here) 
            )
        { 
            Misc.ValidateArgumentNonNull(element, "element" ); 
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" );
 
            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read );

            // Remove the client-side listener for for this event
            ClientEventManager.RemoveListener(AutomationElement.AutomationPropertyChangedEvent, element, eventHandler); 
        }
 
        ///  
        /// Called by a client to add a listener for structure change events.
        ///  
        /// Element on which to listen for structure change events.
        /// Specifies whether to listen to property changes events on the specified element, and/or its ancestors and children.
        /// Delegate to call when a structure change event occurs.
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        ///  
        /// 
        public static void AddStructureChangedEventHandler(AutomationElement element, TreeScope scope, StructureChangedEventHandler eventHandler) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler");
 
            // Add a client-side listener for for this event request
            EventListener l = new EventListener(AutomationElement.StructureChangedEvent, scope, null, CacheRequest.CurrentUiaCacheRequest); 
 
            ClientEventManager.AddListener(element, eventHandler, l);
        } 

        /// 
        /// Called by a client to remove a listener for structure change events.
        ///  
        /// Element to remove listener for
        /// The handler object that was passed to AddStructureChangedListener 
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        /// 
        /// 
        public static void RemoveStructureChangedEventHandler(AutomationElement element, StructureChangedEventHandler eventHandler)
        { 
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler"); 
            //CASRemoval:AutomationPermission.Demand(AutomationPermissionFlag.Read); 

            // Remove the client-side listener for for this event 
            ClientEventManager.RemoveListener(AutomationElement.StructureChangedEvent, element, eventHandler);
        }

        ///  
        /// Called by a client to add a listener for focus changed events.
        ///  
        /// Delegate to call when a focus change event occurs. 
        ///
        ///  
        /// This API does not work inside the secure execution environment.
        /// 
        /// 
        public static void AddAutomationFocusChangedEventHandler( 
            AutomationFocusChangedEventHandler eventHandler
            ) 
        { 
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" );
 
            // Add a client-side listener for for this event request
            EventListener l = new EventListener(AutomationElement.AutomationFocusChangedEvent,
                                                TreeScope.Subtree | TreeScope.Ancestors,
                                                null, 
                                                CacheRequest.CurrentUiaCacheRequest);
            ClientEventManager.AddFocusListener(eventHandler, l); 
        } 

        ///  
        /// Called by a client to remove a listener for focus changed events.
        /// 
        /// The handler object that was passed to AddAutomationFocusChangedListener
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        ///  
        /// 
        public static void RemoveAutomationFocusChangedEventHandler( 
            AutomationFocusChangedEventHandler eventHandler
            )
        {
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" ); 

            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read ); 
 
            // Remove the client-side listener for for this event
            ClientEventManager.RemoveFocusListener(eventHandler); 
        }

        /// 
        /// Called by a client to remove all listeners that the client has added. 
        /// 
        /// 
        ///  
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static void RemoveAllEventHandlers()
        {
            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read ); 

            // Remove the client-side listener for for this event 
            ClientEventManager.RemoveAllListeners(); 
        }
        #endregion Events 

        #endregion Public Methods
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Facade class that groups together the main functionality that clients need to get started. 
//
// History: 
//  06/02/2003 : BrendanM Ported to WCP
//  07/23/2003 : MKarr removed start and includeStart from FindRawElement and FindLogicalElement
//
//--------------------------------------------------------------------------- 

// PRESHARP: In order to avoid generating warnings about unkown message numbers and unknown pragmas. 
#pragma warning disable 1634, 1691 

using System.Windows.Automation; 
using System.Windows.Automation.Provider;
using System;
using System.Runtime.InteropServices;
using System.Security.Permissions; 
using System.Reflection;
using System.Diagnostics; 
using MS.Internal.Automation; 
using MS.Win32;
 
namespace System.Windows.Automation
{
    /// 
    /// Class containing client Automation methods that are not specific to a particular element 
    /// 
#if (INTERNAL_COMPILE) 
    internal static class Automation 
#else
    public static class Automation 
#endif
    {

        //----------------------------------------------------- 
        //
        //  Public Constants / Readonly Fields 
        // 
        //-----------------------------------------------------
 
        #region Public Constants and Readonly Fields

        /// Condition that describes the Raw view of the UIAutomation tree
        public static readonly Condition RawViewCondition = Condition.TrueCondition; 

        /// Condition that describes the Control view of the UIAutomation tree 
        public static readonly Condition ControlViewCondition = new NotCondition( 
                                            new PropertyCondition( AutomationElement.IsControlElementProperty, false) );
        // 


        /// Condition that describes the Content view of the UIAutomation tree
        public static readonly Condition ContentViewCondition = new NotCondition( new OrCondition( 
                                            new PropertyCondition( AutomationElement.IsControlElementProperty, false),
                                            new PropertyCondition( AutomationElement.IsContentElementProperty, false))); 
 
        #endregion Public Constants and Readonly Fields
 

        //------------------------------------------------------
        //
        //  Public Methods 
        //
        //----------------------------------------------------- 
 

        #region Public Methods 

        #region Element Comparisons
        /// 
        /// Compares two elements, returning true if both refer to the same piece of UI. 
        /// 
        /// element to compare 
        /// element to compare 
        /// true if el1 and el2 refer to the same underlying UI
        /// Both el1 and el1 must be non-null 
        ///
        /// 
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static bool Compare(AutomationElement el1, AutomationElement el2) 
        { 
            return Misc.Compare(el1, el2);
        } 

        /// 
        /// Compares two integer arrays, returning true if they have the same contents
        ///  
        /// integer array to compare
        /// integer array to compare 
        /// true if runtimeId1 and runtimeId2 refer to the same underlying UI 
        /// Both runtimeId1 and runtimeId2 must be non-null. Can be
        /// used to compare RuntimeIds from elements. 
        ///
        /// 
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static bool Compare(int[] runtimeId1, int[] runtimeId2) 
        { 
            return Misc.Compare(runtimeId1, runtimeId2);
        } 
        #endregion Element Comparisons

        #region Misc: Find, Property Names
        ///  
        /// Get string describing specified property idenfier
        ///  
        /// property to get string for 
        /// Sting containing human-readable name of specified property
        public static string PropertyName( AutomationProperty property ) 
        {
            Misc.ValidateArgumentNonNull(property, "property");
            // Suppress PRESHARP Parameter to this public method must be validated; element is checked above.
#pragma warning suppress 56506 
            string full = property.ProgrammaticName.Split('.')[1]; // remove portion before the ".", leaving just "NameProperty" or similar
            return full.Substring(0, full.Length - 8); // Slice away "Property" suffix 
        } 

        ///  
        /// Get string describing specified pattern idenfier
        /// 
        /// pattern to get string for
        /// Sting containing human-readable name of specified pattern 
        public static string PatternName( AutomationPattern pattern )
        { 
            Misc.ValidateArgumentNonNull(pattern, "pattern"); 
            // Suppress PRESHARP Parameter to this public method must be validated; element is checked above.
#pragma warning suppress 56506 
            string full = pattern.ProgrammaticName;
            return full.Substring(0, full.Length - 26); // Slice away "InvokePatternIdentifiers.Pattern" to get just "Invoke"
        }
        #endregion Misc: Find, Property Names 

        #region Events 
        ///  
        /// Called by a client to add a listener for pattern or custom events.
        ///  
        /// A control pattern or custom event identifier.
        /// Element on which to listen for control pattern or custom events.
        /// Specifies whether to listen to property changes events on the specified element, and/or its ancestors and children.
        /// Delegate to call when the specified event occurs. 
        ///
        ///  
        /// This API does not work inside the secure execution environment. 
        /// 
        ///  
        public static void AddAutomationEventHandler(
            AutomationEvent eventId,
            AutomationElement element,
            TreeScope scope, 
            AutomationEventHandler eventHandler
            ) 
        { 
            Misc.ValidateArgumentNonNull(element, "element" );
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" ); 
            Misc.ValidateArgument( eventId != AutomationElement.AutomationFocusChangedEvent, SRID.EventIdMustNotBeAutomationFocusChanged );
            Misc.ValidateArgument( eventId != AutomationElement.StructureChangedEvent,SRID.EventIdMustNotBeStructureChanged );
            Misc.ValidateArgument( eventId != AutomationElement.AutomationPropertyChangedEvent, SRID.EventIdMustNotBeAutomationPropertyChanged );
 
            if (eventId == WindowPattern.WindowClosedEvent)
            { 
                // Once a window closes and the hwnd is destroyed we won't be able to determine where it was in the 
                // Automation tree; therefore only support WindowClosed events for all windows (eg. src==root and scope
                // is descendants) or a specific WindowPattern element (src==root of a Window and scope is the element). 
                // Also handle odd combinations (eg. src==specific element and scope is subtree|ancestors).

                bool paramsValidated = false;
 
                if ( Misc.Compare( element, AutomationElement.RootElement ) )
                { 
                    // For root element need to have Descendants scope set (Note: Subtree includes Descendants) 
                    if ( ( scope & TreeScope.Descendants ) == TreeScope.Descendants )
                    { 
                        paramsValidated = true;
                    }
                }
                else 
                {
                    // otherwise non-root elements must have the entire tree (Anscestors, Element and Descendants)... 
                    if ( ( scope & ( TreeScope.Ancestors | TreeScope.Element | TreeScope.Descendants ) ) == ( TreeScope.Ancestors | TreeScope.Element | TreeScope.Descendants ) ) 
                    {
                        paramsValidated = true; 
                    }
                    else if ( ( scope & TreeScope.Element ) == TreeScope.Element )
                    {
                        // ...OR Element where the element implements WindowPattern 
                        // PRESHARP will flag this as warning 56506/6506:Parameter 'element' to this public method must be validated: A null-dereference can occur here.
                        // False positive, element is checked, see above 
#pragma warning suppress 6506 
                        object val = element.GetCurrentPropertyValue(AutomationElement.NativeWindowHandleProperty);
                        if ( val != null && val is int && (int)val != 0 ) 
                        {
                            if ( HwndProxyElementProvider.IsWindowPatternWindow( NativeMethods.HWND.Cast( new IntPtr( (int)val ) ) ) )
                            {
                                paramsValidated = true; 
                            }
                        } 
                    } 
                }
 
                if ( !paramsValidated )
                {
                    throw new ArgumentException( SR.Get( SRID.ParamsNotApplicableToWindowClosedEvent ) );
                } 
            }
 
            // Add a client-side Handler for for this event request 
            EventListener l = new EventListener(eventId, scope, null, CacheRequest.CurrentUiaCacheRequest);
            ClientEventManager.AddListener(element, eventHandler, l); 
        }


        ///  
        /// Called by a client to remove a listener for pattern or custom events.
        ///  
        /// a UIAccess or custom event identifier. 
        /// Element to remove listener for
        /// The handler object that was passed to AddEventListener 
        ///
        /// 
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static void RemoveAutomationEventHandler( 
            AutomationEvent eventId, 
            AutomationElement element,
            AutomationEventHandler eventHandler 
            )
        {
            Misc.ValidateArgumentNonNull(element, "element" );
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" ); 
            Misc.ValidateArgument( eventId != AutomationElement.AutomationFocusChangedEvent, SRID.EventIdMustNotBeAutomationFocusChanged );
            Misc.ValidateArgument( eventId != AutomationElement.StructureChangedEvent, SRID.EventIdMustNotBeStructureChanged ); 
            Misc.ValidateArgument( eventId != AutomationElement.AutomationPropertyChangedEvent, SRID.EventIdMustNotBeAutomationPropertyChanged ); 

            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read ); 

            // Remove the client-side listener for for this event
            ClientEventManager.RemoveListener( eventId, element, eventHandler );
        } 

        ///  
        /// Called by a client to add a listener for property changed events. 
        /// 
        /// Element on which to listen for property changed events. 
        /// Specifies whether to listen to property changes events on the specified element, and/or its ancestors and children.
        /// Callback object to call when a specified property change occurs.
        /// Params array of properties to listen for changes in.
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        ///  
        /// 
        public static void AddAutomationPropertyChangedEventHandler( 
            AutomationElement element,            // reference element for listening to the event
            TreeScope scope,                   // scope to listen to
            AutomationPropertyChangedEventHandler eventHandler,    // callback object
            params AutomationProperty [] properties           // listen for changes to these properties 
            )
        { 
            Misc.ValidateArgumentNonNull(element, "element" ); 
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" );
            Misc.ValidateArgumentNonNull(properties, "properties" ); 
            if (properties.Length == 0)
            {
                throw new ArgumentException( SR.Get(SRID.AtLeastOnePropertyMustBeSpecified) );
            } 

            // Check that no properties are interpreted properties 
            // 

            foreach (AutomationProperty property in properties) 
            {
                Misc.ValidateArgumentNonNull(property, "properties" );
            }
 
            // Add a client-side listener for for this event request
            EventListener l = new EventListener(AutomationElement.AutomationPropertyChangedEvent, scope, properties, CacheRequest.CurrentUiaCacheRequest); 
            ClientEventManager.AddListener(element, eventHandler, l); 
        }
 
        /// 
        /// Called by a client to remove a listener for property changed events.
        /// 
        /// Element to remove listener for 
        /// The handler object that was passed to AutomationPropertyChangedEventHandler
        /// 
        ///  
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static void RemoveAutomationPropertyChangedEventHandler(
            AutomationElement element,            // reference element being listened to
            AutomationPropertyChangedEventHandler eventHandler     // callback object (used as cookie here) 
            )
        { 
            Misc.ValidateArgumentNonNull(element, "element" ); 
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" );
 
            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read );

            // Remove the client-side listener for for this event
            ClientEventManager.RemoveListener(AutomationElement.AutomationPropertyChangedEvent, element, eventHandler); 
        }
 
        ///  
        /// Called by a client to add a listener for structure change events.
        ///  
        /// Element on which to listen for structure change events.
        /// Specifies whether to listen to property changes events on the specified element, and/or its ancestors and children.
        /// Delegate to call when a structure change event occurs.
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        ///  
        /// 
        public static void AddStructureChangedEventHandler(AutomationElement element, TreeScope scope, StructureChangedEventHandler eventHandler) 
        {
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler");
 
            // Add a client-side listener for for this event request
            EventListener l = new EventListener(AutomationElement.StructureChangedEvent, scope, null, CacheRequest.CurrentUiaCacheRequest); 
 
            ClientEventManager.AddListener(element, eventHandler, l);
        } 

        /// 
        /// Called by a client to remove a listener for structure change events.
        ///  
        /// Element to remove listener for
        /// The handler object that was passed to AddStructureChangedListener 
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        /// 
        /// 
        public static void RemoveStructureChangedEventHandler(AutomationElement element, StructureChangedEventHandler eventHandler)
        { 
            Misc.ValidateArgumentNonNull(element, "element");
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler"); 
            //CASRemoval:AutomationPermission.Demand(AutomationPermissionFlag.Read); 

            // Remove the client-side listener for for this event 
            ClientEventManager.RemoveListener(AutomationElement.StructureChangedEvent, element, eventHandler);
        }

        ///  
        /// Called by a client to add a listener for focus changed events.
        ///  
        /// Delegate to call when a focus change event occurs. 
        ///
        ///  
        /// This API does not work inside the secure execution environment.
        /// 
        /// 
        public static void AddAutomationFocusChangedEventHandler( 
            AutomationFocusChangedEventHandler eventHandler
            ) 
        { 
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" );
 
            // Add a client-side listener for for this event request
            EventListener l = new EventListener(AutomationElement.AutomationFocusChangedEvent,
                                                TreeScope.Subtree | TreeScope.Ancestors,
                                                null, 
                                                CacheRequest.CurrentUiaCacheRequest);
            ClientEventManager.AddFocusListener(eventHandler, l); 
        } 

        ///  
        /// Called by a client to remove a listener for focus changed events.
        /// 
        /// The handler object that was passed to AddAutomationFocusChangedListener
        /// 
        /// 
        /// This API does not work inside the secure execution environment. 
        ///  
        /// 
        public static void RemoveAutomationFocusChangedEventHandler( 
            AutomationFocusChangedEventHandler eventHandler
            )
        {
            Misc.ValidateArgumentNonNull(eventHandler, "eventHandler" ); 

            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read ); 
 
            // Remove the client-side listener for for this event
            ClientEventManager.RemoveFocusListener(eventHandler); 
        }

        /// 
        /// Called by a client to remove all listeners that the client has added. 
        /// 
        /// 
        ///  
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public static void RemoveAllEventHandlers()
        {
            //CASRemoval:AutomationPermission.Demand( AutomationPermissionFlag.Read ); 

            // Remove the client-side listener for for this event 
            ClientEventManager.RemoveAllListeners(); 
        }
        #endregion Events 

        #endregion Public Methods
    }
} 

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

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