DocumentAutomationPeer.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Automation / Peers / DocumentAutomationPeer.cs / 2 / DocumentAutomationPeer.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: DocumentAutomationPeer.cs 
//
// Description: AutomationPeer associated with flow and fixed documents. 
// 
//---------------------------------------------------------------------------
 
using System.Collections.Generic;           // List
using System.Security;                      // SecurityCritical
using System.Windows.Documents;             // ITextContainer
using System.Windows.Interop;               // HwndSource 
using System.Windows.Media;                 // Visual
using MS.Internal;                          // PointUtil 
using MS.Internal.Automation;               // TextAdaptor 
using MS.Internal.Documents;                // TextContainerHelper
 
namespace System.Windows.Automation.Peers
{
    /// 
    /// AutomationPeer associated with flow and fixed documents. 
    /// 
    public class DocumentAutomationPeer : ContentTextAutomationPeer 
    { 
        /// 
        /// Constructor. 
        /// 
        /// Owner of the AutomationPeer.
        public DocumentAutomationPeer(FrameworkContentElement owner)
            : base(owner) 
        { }
 
        ///  
        /// Notify the peer that it has been disconnected.
        ///  
        internal void OnDisconnected()
        {
            if (_textPattern != null)
            { 
                _textPattern.Dispose();
                _textPattern = null; 
            } 
        }
 
        /// 
        /// 
        /// 
        ///  
        /// Since DocumentAutomationPeer gives access to its content through
        /// TextPattern, this method always returns null. 
        ///  
        protected override List GetChildrenCore()
        { 
            if (_childrenStart != null && _childrenEnd != null)
            {
                ITextContainer textContainer = ((IServiceProvider)Owner).GetService(typeof(ITextContainer)) as ITextContainer;
                return TextContainerHelper.GetAutomationPeersFromRange(_childrenStart, _childrenEnd, textContainer.Start); 
            }
            return null; 
        } 

        ///  
        /// 
        /// 
        public override object GetPattern(PatternInterface patternInterface)
        { 
            object returnValue = null;
 
            if (patternInterface == PatternInterface.Text) 
            {
                if (_textPattern == null) 
                {
                    if (Owner is IServiceProvider)
                    {
                        ITextContainer textContainer = ((IServiceProvider)Owner).GetService(typeof(ITextContainer)) as ITextContainer; 
                        if (textContainer != null)
                        { 
                            _textPattern = new TextAdaptor(this, textContainer); 
                        }
                    } 
                }
                returnValue = _textPattern;
            }
 
            return returnValue;
        } 
 
        /// 
        ///  
        /// 
        protected override AutomationControlType GetAutomationControlTypeCore()
        {
            return AutomationControlType.Document; 
        }
 
        ///  
        /// 
        ///  
        /// 
        protected override string GetClassNameCore()
        {
            return "Document"; 
        }
 
        ///  
        /// 
        ///  
        protected override bool IsControlElementCore()
        {
            return true;
        } 

        ///  
        ///  
        /// 
        ///  
        ///     Critical    - Calls PresentationSource.CriticalFromVisual to get the source for this visual
        ///     TreatAsSafe - The returned PresenationSource object is not exposed and is only used for converting
        ///                   co-ordinates to screen space.
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        protected override Rect GetBoundingRectangleCore() 
        { 
            UIElement uiScope;
            Rect boundingRect = CalculateBoundingRect(false, out uiScope); 
            if (boundingRect != Rect.Empty && uiScope != null)
            {
                HwndSource hwndSource = PresentationSource.CriticalFromVisual(uiScope) as HwndSource;
                if (hwndSource != null) 
                {
                    boundingRect = PointUtil.ElementToRoot(boundingRect, uiScope, hwndSource); 
                    boundingRect = PointUtil.RootToClient(boundingRect, hwndSource); 
                    boundingRect = PointUtil.ClientToScreen(boundingRect, hwndSource);
                } 
            }
            return boundingRect;
        }
 
        /// 
        ///  
        ///  
        /// 
        ///     Critical    - Calls PresentationSource.CriticalFromVisual to get the source for this visual 
        ///     TreatAsSafe - The returned PresenationSource object is not exposed and is only used for converting
        ///                   co-ordinates to screen space.
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        protected override Point GetClickablePointCore()
        { 
            Point point = new Point(); 
            UIElement uiScope;
            Rect boundingRect = CalculateBoundingRect(true, out uiScope); 
            if (boundingRect != Rect.Empty && uiScope != null)
            {
                HwndSource hwndSource = PresentationSource.CriticalFromVisual(uiScope) as HwndSource;
                if (hwndSource != null) 
                {
                    boundingRect = PointUtil.ElementToRoot(boundingRect, uiScope, hwndSource); 
                    boundingRect = PointUtil.RootToClient(boundingRect, hwndSource); 
                    boundingRect = PointUtil.ClientToScreen(boundingRect, hwndSource);
                    point = new Point(boundingRect.Left + boundingRect.Width * 0.1, boundingRect.Top + boundingRect.Height * 0.1); 
                }
            }
            return point;
        } 

        ///  
        ///  
        /// 
        protected override bool IsOffscreenCore() 
        {
            UIElement uiScope;
            Rect boundingRect = CalculateBoundingRect(true, out uiScope);
            return (boundingRect == Rect.Empty || uiScope == null); 
        }
 
        ///  
        /// Gets collection of AutomationPeers for given text range.
        ///  
        internal override List GetAutomationPeersFromRange(ITextPointer start, ITextPointer end)
        {
            _childrenStart = start.CreatePointer();
            _childrenEnd = end.CreatePointer(); 
            ResetChildrenCache();
            return GetChildren(); 
        } 

        ///  
        /// Calculate visible rectangle.
        /// 
        private Rect CalculateBoundingRect(bool clipToVisible, out UIElement uiScope)
        { 
            uiScope = null;
            Rect boundingRect = Rect.Empty; 
            if (Owner is IServiceProvider) 
            {
                ITextContainer textContainer = ((IServiceProvider)Owner).GetService(typeof(ITextContainer)) as ITextContainer; 
                ITextView textView = (textContainer != null) ? textContainer.TextView : null;
                if (textView != null)
                {
                    // Make sure TextView is updated 
                    if (!textView.IsValid)
                    { 
                        if (!textView.Validate()) 
                        {
                            textView = null; 
                        }
                        if (textView != null && !textView.IsValid)
                        {
                            textView = null; 
                        }
                    } 
                    // Get bounding rect from TextView. 
                    if (textView != null)
                    { 
                        boundingRect = new Rect(textView.RenderScope.RenderSize);
                        uiScope = textView.RenderScope;

                        // Compute visible portion of the rectangle. 
                        if (clipToVisible)
                        { 
                            Visual visual = textView.RenderScope; 
                            while (visual != null && boundingRect != Rect.Empty)
                            { 
                                if (VisualTreeHelper.GetClip(visual) != null)
                                {
                                    GeneralTransform transform = textView.RenderScope.TransformToAncestor(visual).Inverse;
                                    // Safer version of transform to descendent (doing the inverse ourself), 
                                    // we want the rect inside of our space. (Which is always rectangular and much nicer to work with)
                                    if (transform != null) 
                                    { 
                                        Rect clipBounds = VisualTreeHelper.GetClip(visual).Bounds;
                                        clipBounds = transform.TransformBounds(clipBounds); 
                                        boundingRect.Intersect(clipBounds);
                                    }
                                    else
                                    { 
                                        // No visibility if non-invertable transform exists.
                                        boundingRect = Rect.Empty; 
                                    } 
                                }
                                visual = VisualTreeHelper.GetParent(visual) as Visual; 
                            }
                        }
                    }
                } 
            }
            return boundingRect; 
        } 

        private ITextPointer _childrenStart; 
        private ITextPointer _childrenEnd;
        private TextAdaptor _textPattern;
    }
} 

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

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