ProxyFragment.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / Win32Providers / MS / Internal / AutomationProxies / ProxyFragment.cs / 1 / ProxyFragment.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Base class for all the Win32 and office Controls. 
//
//              The ProxyFragment class is the base class for NODES in the 
//              element tree that are not hwnd based in the case of Win32 controls (e.g. ListViewItem)
//
//              The UIAutomation internal provider does not allow for a node to
//              iterate through its children. 
//              The ProxyFragment class removes this limitation.
// 
//              Class ProxyFragment: 
//                  ProxySimple - methods
//                  ElementProviderFromPoint 
//                  GetFocus
//
//
//              NOTE: ProxyFragment is responsible for hit-testing on its children, since UIAutomation 
//                    will not call ElementProviderFromPoint on the Fragment!
// 
//              Here are the easy steps for drilling down: 
//                     UIAutomation will call ProxyHwnd.ElementProviderFromPoint automatically,
//                     you (implementer) should do a hit test on ProxyHwnd's immediate children only. 
//                     If hit-test succeeds and element that you got is ProxyFragment
//                     call ProxyFragment.DrillDownIntoFragment(fragment, x, y)
//                     Each ProxyFragment should implement ElementProviderFromPoint; this method will be used by
//                     DrillDownIntoFragment to drill into the hierarchy of any depth. 
//                     Note: You can implement all the drilling down "locally" in your ProxyHwnd.ElementProviderFromPoint,
//                           but it is strongly suggested to do it as described above, so we'll have a generic solution that always works 
// 
//
// History: 
//  07/01/2003 : a-jeanp Created
//  08/21/2003: alexsn ElementProviderFromPoint corrections
//
//--------------------------------------------------------------------------- 
using System;
using System.Windows.Automation; 
using System.Windows.Automation.Provider; 
using System.ComponentModel;
using System.Collections; 
using System.Runtime.InteropServices;

namespace MS.Internal.AutomationProxies
{ 
    // Base Class for all the Windows Control that supports navigation.
    // Implements the default behaviors 
    class ProxyFragment : ProxySimple, IRawElementProviderFragmentRoot 
    {
        // ----------------------------------------------------- 
        //
        // Constructors
        //
        // ----------------------------------------------------- 

        #region Constructors 
 
        internal ProxyFragment (IntPtr hwnd, ProxyFragment parent, int item) : base (hwnd, parent, item)
        {} 

        #endregion

        // ------------------------------------------------------ 
        //
        // Patterns Implementation 
        // 
        // -----------------------------------------------------
 
        #region ProxyFragment Methods

        // ------------------------------------------------------
        // 
        // Default implementation for ProxyFragment members
        // 
        // ------------------------------------------------------ 

        // Next Silbing: assumes none, must be overloaded by a subclass if any 
        // The method is called on the parent with a reference to the child.
        // This makes the implementation a lot more clean than the UIAutomation call
        internal virtual ProxySimple GetNextSibling (ProxySimple child)
        { 
            return null;
        } 
 
        // Prev Silbing: assumes none, must be overloaded by a subclass if any
        // The method is called on the parent with a reference to the child. 
        // This makes the implementation a lot more clean than the UIAutomation call
        internal virtual ProxySimple GetPreviousSibling (ProxySimple child)
        {
            return null; 
        }
 
        // GetFirstChild: assumes none, must be overloaded by a subclass if any 
        internal virtual ProxySimple GetFirstChild ()
        { 
            return null;
        }

        // GetLastChild: assumes none, must be overloaded by a subclass if any 
        internal virtual ProxySimple GetLastChild ()
        { 
            return null; 
        }
 
        // Returns a Proxy element corresponding to the specified screen coordinates.
        // In the derived class implement this method to do fragment specific drill down (if needed)
        // Fragment should drill down only among its immediate children.
        internal virtual ProxySimple ElementProviderFromPoint (int x, int y) 
        {
            return this; 
        } 

        // Returns an item corresponding to the focused element (if there is one), or null otherwise. 
        internal virtual ProxySimple GetFocus ()
        {
            return this is ProxyHwnd ? this : null;
        } 

        #endregion 
 

        #region IRawElementProviderFragmentRoot Interface 
        // NOTE: This method should only be called (by Proxy or/and UIAutomation) on Proxies of type
        //       ProxyHwnd. Anything else indicates a problem
        IRawElementProviderFragment IRawElementProviderFragmentRoot.ElementProviderFromPoint (double x, double y)
        { 
            System.Diagnostics.Debug.Assert(this is ProxyHwnd,  "Invalid method called ElementProviderFromPoint");
 
            // Do the proper rounding. 
            return ElementProviderFromPoint ((int) (x + 0.5), (int) (y + 0.5));
        } 

        IRawElementProviderFragment IRawElementProviderFragmentRoot.GetFocus ()
        {
            return GetFocus (); 
        }
 
        #endregion 

        #region IRawElementProviderFragment Interface 

        // Request to return the element in the specified direction
        IRawElementProviderFragment IRawElementProviderFragment.Navigate(NavigateDirection direction)
        { 
            switch (direction)
            { 
                case NavigateDirection.NextSibling : 
                    {
                        // NOTE: Do not use GetParent(), call _parent explicitly 
                        return _fSubTree ? _parent.GetNextSibling (this) : null;
                    }

                case NavigateDirection.PreviousSibling : 
                    {
                        // NOTE: Do not use GetParent(), call _parent explicitly 
                        return _fSubTree ? _parent.GetPreviousSibling (this) : null; 
                    }
 
                case NavigateDirection.FirstChild :
                    {
                        return GetFirstChild ();
                    } 

                case NavigateDirection.LastChild : 
                    { 
                        return GetLastChild ();
                    } 

                case NavigateDirection.Parent :
                    {
                        return GetParent (); 
                    }
 
                default : 
                    {
                        return null; 
                    }
            }
        }
 
        #endregion
 
        //----------------------------------------------------- 
        //
        //  Internal Methods 
        //
        //------------------------------------------------------

        #region Internal Methods 

        // Recursively Raise an Event for all the sub elements 
        override internal void RecursiveRaiseEvents (object idProp, AutomationPropertyChangedEventArgs e) 
        {
            AutomationInteropProvider.RaiseAutomationPropertyChangedEvent (this, e); 
            for (ProxySimple el = GetFirstChild (); el != null; el = this.GetNextSibling (el))
            {
                el.RecursiveRaiseEvents (idProp, e);
            } 
        }
 
        #endregion 

        //----------------------------------------------------- 
        //
        //  Protected Methods
        //
        //----------------------------------------------------- 

        #region Protected Methods 
 
        // This method will return the leaf element that lives in ProxyFragment at Point(x,y)
        static internal ProxySimple DrillDownFragment(ProxyFragment fragment, int x, int y) 
        {
            System.Diagnostics.Debug.Assert(fragment != null, "DrillDownFragment: starting point is null");

            // drill down 
            ProxySimple fromPoint = fragment.ElementProviderFromPoint(x, y);
 
            System.Diagnostics.Debug.Assert(fromPoint != null, @"DrillDownFragment: calling ElementProviderFromPoint on Fragment should not return null"); 

            // Check if we got back a new fragment 
            // do this check before trying to cast to ProxyFragment
            if (fragment == fromPoint || Misc.Compare(fragment, fromPoint))
            {
                // Point was on the fragment 
                // but not on any element that lives inside of the fragment
                return fragment; 
            } 

            fragment = fromPoint as ProxyFragment; 
            if (fragment == null)
            {
                // we got back a simple element
                return fromPoint; 
            }
 
            // Got a new fragment, continue drilling 
            return DrillDownFragment(fragment, x, y);
        } 

        #endregion

    } 
}

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