TextPattern.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / UIAutomation / UIAutomationClient / System / Windows / Automation / TextPattern.cs / 1305600 / TextPattern.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Client-side wrapper for Text pattern 
//
// History: 
//  08/01/2003 : Micw Ported to WCP
//  02/09/2004 : a-davidj rewrote for Text Pattern redesign.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Diagnostics; 
using System.Security.Permissions;
using System.Windows.Automation.Provider; 
using System.Windows.Automation.Text;
using MS.Internal.Automation;

namespace System.Windows.Automation 
{
    ///  
    /// Purpose: 
    ///     The TextPattern object is what you get back when you ask an element for text pattern.
    /// Example usages: 
    ///     It is the Interface that represents text like an edit control. This pretty
    ///     much means any UI elements that contain text.
    /// 
#if (INTERNAL_COMPILE) 
    internal class TextPattern: BasePattern
#else 
    public class TextPattern: BasePattern 
#endif
    { 

        #region Constructors

        internal TextPattern(AutomationElement el, SafePatternHandle hPattern) 
            : base(el, hPattern)
        { 
            Debug.Assert(el != null); 
            Debug.Assert(!hPattern.IsInvalid);
 
            _hPattern = hPattern;
            _element = el;
        }
        #endregion Constructors 

        //----------------------------------------------------- 
        // 
        //  Public Constants / Readonly Fields
        // 
        //-----------------------------------------------------

        #region Public Constants and Readonly Fields
 
        /// 
        /// Indicates that a text attribute varies over a range. 
        ///  
        public static readonly object MixedAttributeValue = TextPatternIdentifiers.MixedAttributeValue;
 
        #region TextAttribute

        // IMPORTANT: if you add or remove AutomationTextAttributes be sure to make the corresponding changes in
        // AutomationComInteropProvider.cs' AutomationConstants struct and AutomationComInteropProvider.InitializeConstants. 

        /// Type of animation applied from AnimationStyle enum.  
        public static readonly AutomationTextAttribute AnimationStyleAttribute = TextPatternIdentifiers.AnimationStyleAttribute; 
        /// Background color as a 32-bit Win32 COLORREF.
        public static readonly AutomationTextAttribute BackgroundColorAttribute = TextPatternIdentifiers.BackgroundColorAttribute; 
        /// Bullet style from BulletStyle enum. 
        public static readonly AutomationTextAttribute BulletStyleAttribute = TextPatternIdentifiers.BulletStyleAttribute;
        /// Cap style from CapStyle enum.
        public static readonly AutomationTextAttribute CapStyleAttribute = TextPatternIdentifiers.CapStyleAttribute; 
        /// CultureInfo of the character down to sub-language level, e.g. Swiss French instead of French. See the CultureInfo in
        /// .NET Framework for more detail on the language code format. Clients should note that there may be many cases where the 
        /// Language of the character defaults to application UI language because many servers do not support language tag and, 
        /// even when supported, authors may not use it.
        public static readonly AutomationTextAttribute CultureAttribute = TextPatternIdentifiers.CultureAttribute; 
        /// Non-localized string that represents font face in TrueType. Providers can supply their own.
        /// Examples include �Arial Black� and �Arial Narrow�. 
        public static readonly AutomationTextAttribute FontNameAttribute = TextPatternIdentifiers.FontNameAttribute;
        /// Point size of the character as a double. 
        public static readonly AutomationTextAttribute FontSizeAttribute = TextPatternIdentifiers.FontSizeAttribute;
        /// Thickness of font as an int. This is modeled after the lfWeight field in GDI LOGFONT. For consistency, the following values 
        /// have been adopted from LOGFONT:0=DontCare, 100=Thin, 200=ExtraLight or UltraLight, 300=Light, 400=Normal or Regular, 
        /// 500=Medium, 600=SemiBold or DemiBold, 700=Bold, 800=ExtraBold or UltraBold, and 900=Heavy or Black.
        public static readonly AutomationTextAttribute FontWeightAttribute = TextPatternIdentifiers.FontWeightAttribute; 
        /// Color of the text as a 32-bit Win32 COLORREF.
        public static readonly AutomationTextAttribute ForegroundColorAttribute = TextPatternIdentifiers.ForegroundColorAttribute;
        /// Horizontal alignment from HorizontalTextAlignment enum. 
        public static readonly AutomationTextAttribute HorizontalTextAlignmentAttribute = TextPatternIdentifiers.HorizontalTextAlignmentAttribute; 
        /// First-line indentation in points as a double.
        public static readonly AutomationTextAttribute IndentationFirstLineAttribute = TextPatternIdentifiers.IndentationFirstLineAttribute; 
        /// Leading indentation in points as a double. 
        public static readonly AutomationTextAttribute IndentationLeadingAttribute = TextPatternIdentifiers.IndentationLeadingAttribute;
        /// Trailing indentation in points as a double. 
        public static readonly AutomationTextAttribute IndentationTrailingAttribute = TextPatternIdentifiers.IndentationTrailingAttribute;
        /// Is the text hidden?  Boolean.
        public static readonly AutomationTextAttribute IsHiddenAttribute = TextPatternIdentifiers.IsHiddenAttribute;
        /// Is the character italicized?  Boolean. 
        public static readonly AutomationTextAttribute IsItalicAttribute = TextPatternIdentifiers.IsItalicAttribute;
        /// Is the character read-only? If a document/file is read-only, but you can still edit it and save it as another file, 
        /// the text inside is considered not read-only.  Boolean. 
        public static readonly AutomationTextAttribute IsReadOnlyAttribute = TextPatternIdentifiers.IsReadOnlyAttribute;
        /// Is the character a sub-script? Boolean. 
        public static readonly AutomationTextAttribute IsSubscriptAttribute = TextPatternIdentifiers.IsSubscriptAttribute;
        /// Is the character a super-script?  Boolean.
        public static readonly AutomationTextAttribute IsSuperscriptAttribute = TextPatternIdentifiers.IsSuperscriptAttribute;
        /// Bottom margin in points as a double. 
        public static readonly AutomationTextAttribute MarginBottomAttribute = TextPatternIdentifiers.MarginBottomAttribute;
        /// Leading margin in points as a double. 
        public static readonly AutomationTextAttribute MarginLeadingAttribute = TextPatternIdentifiers.MarginLeadingAttribute; 
        /// Top margin in points as a double.
        public static readonly AutomationTextAttribute MarginTopAttribute = TextPatternIdentifiers.MarginTopAttribute; 
        /// Trailing margin in points as a double.
        public static readonly AutomationTextAttribute MarginTrailingAttribute = TextPatternIdentifiers.MarginTrailingAttribute;
        /// Outline style from OutlineStyles enum.
        public static readonly AutomationTextAttribute OutlineStylesAttribute = TextPatternIdentifiers.OutlineStylesAttribute; 
        /// Color of the overline as a Win32 COLORREF. This attribute may not be available if the color is
        /// always the same as the foreground color. 
        public static readonly AutomationTextAttribute OverlineColorAttribute = TextPatternIdentifiers.OverlineColorAttribute; 
        /// Overline style from TextDecorationLineStyle enum.
        public static readonly AutomationTextAttribute OverlineStyleAttribute = TextPatternIdentifiers.OverlineStyleAttribute; 
        /// Color of the strikethrough as a Win32 COLORREF. This attribute may not be available if the color is
        /// always the same as the foreground color.
        public static readonly AutomationTextAttribute StrikethroughColorAttribute = TextPatternIdentifiers.StrikethroughColorAttribute;
        /// Strikethrough style from TextDecorationLineStyle enum. 
        public static readonly AutomationTextAttribute StrikethroughStyleAttribute = TextPatternIdentifiers.StrikethroughStyleAttribute;
        /// The set of tabs in points relative to the leading margin. Array of double. 
        public static readonly AutomationTextAttribute TabsAttribute = TextPatternIdentifiers.TabsAttribute; 
        /// Text flow direction from FlowDirection flags enum.
        public static readonly AutomationTextAttribute TextFlowDirectionsAttribute = TextPatternIdentifiers.TextFlowDirectionsAttribute; 
        /// Color of the underline as a Win32 COLORREF. This attribute may not be available if the color is
        /// always the same as the foreground color.
        public static readonly AutomationTextAttribute UnderlineColorAttribute = TextPatternIdentifiers.UnderlineColorAttribute;
        /// Underline style from TextDecorationLineStyle enum. 
        public static readonly AutomationTextAttribute UnderlineStyleAttribute = TextPatternIdentifiers.UnderlineStyleAttribute;
 
        #endregion TextAttribute 

        #region Patterns & Events 

        /// Text pattern

        public static readonly AutomationPattern Pattern = TextPatternIdentifiers.Pattern; 

        ///  
        /// Event ID: TextSelectionChangedEvent 
        /// When:  Sent to the event handler when the selection changes.
        ///  

        public static readonly AutomationEvent TextSelectionChangedEvent =
            TextPatternIdentifiers.TextSelectionChangedEvent;
 
        /// 
        /// Event ID: TextChangedEvent 
        /// When:  Sent to the event handler when text changes. 
        /// 
 
        public static readonly AutomationEvent TextChangedEvent =
            TextPatternIdentifiers.TextChangedEvent;

        #endregion Patterns & Events 

        #endregion Public Constants and Readonly Fields 
 
        //------------------------------------------------------
        // 
        //  Public Methods
        //
        //-----------------------------------------------------
 
        #region Public Methods
 
        ///  
        /// Retrieves the current selection.
        ///  
        /// The range of text that is selected, or possibly null if there is
        /// no selection.
        public TextPatternRange [] GetSelection()
        { 
            SafeTextRangeHandle [] hTextRanges = UiaCoreApi.TextPattern_GetSelection(_hPattern);
            return TextPatternRange.Wrap(hTextRanges, this); 
        } 

        ///  
        /// Retrieves the visible range within the container
        /// 
        /// The range of text that is visible within the container.  Note that the
        /// text of the range could be obscured by an overlapping window.  Also, portions 
        /// of the range at the beginning, in the middle, or at the end may not be visible
        /// because they are scrolled off to the side. 
        public TextPatternRange [] GetVisibleRanges() 
        {
            SafeTextRangeHandle [] hTextRanges = UiaCoreApi.TextPattern_GetVisibleRanges(_hPattern); 
            return TextPatternRange.Wrap(hTextRanges, this);
        }

        ///  
        /// Retrieves the range of a child object.
        ///  
        /// The child element.  If the element is not 
        /// a child of the text container then an InvalidOperation exception is
        /// thrown. 
        /// A range that spans the child element.
        public TextPatternRange RangeFromChild(AutomationElement childElement)
        {
            if (childElement == null) 
            {
                throw new ArgumentNullException("childElement"); 
            } 
            SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_RangeFromChild(_hPattern, childElement.RawNode);
            return TextPatternRange.Wrap(hTextRange, this); 
        }
        /// 
        /// Finds the range nearest to a screen coordinate.
        /// If the coordinate is within the bounding rectangle of a character then the 
        /// range will contain that character.  Otherwise, it will be a degenerate
        /// range near the point, chosen in an implementation-dependent manner. 
        /// An InvalidOperation exception is thrown if the point is outside of the 
        /// client area of the text container.
        ///  
        /// The location in screen coordinates.
        /// A degenerate range nearest the specified location.
        public TextPatternRange RangeFromPoint(Point screenLocation)
        { 
            //If we are not within the client area throw an exception
            Rect rect = (Rect)_element.GetCurrentPropertyValue(AutomationElement.BoundingRectangleProperty); 
            if (screenLocation.X < rect.Left || screenLocation.X >= rect.Right || screenLocation.Y < rect.Top || screenLocation.Y >= rect.Bottom) 
            {
                throw new ArgumentException(SR.Get(SRID.ScreenCoordinatesOutsideBoundingRect)); 
            }

            SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_RangeFromPoint(_hPattern, screenLocation);
            return TextPatternRange.Wrap(hTextRange, this); 
        }
 
        #endregion Public Methods 

        //------------------------------------------------------ 
        //
        //  Public Properties
        //
        //------------------------------------------------------ 

        #region Public Properties 
 
        /// 
        /// A text range that encloses the main text of the document.  Some auxillary text such as 
        /// headers, footnotes, or annotations may not be included.
        /// 
        public TextPatternRange DocumentRange
        { 
            get
            { 
                SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_get_DocumentRange(_hPattern); 
                return TextPatternRange.Wrap(hTextRange, this);
            } 
        }

        /// 
        /// True if the text container supports text selection. If it does then 
        /// you may use the GetSelection and TextPatternRange.Select methods.
        ///  
        public SupportedTextSelection SupportedTextSelection 
        {
            get 
            {
                return UiaCoreApi.TextPattern_get_SupportedTextSelection(_hPattern);
            }
        } 

        #endregion Public Properties 
 
        //-----------------------------------------------------
        // 
        //  Internal Methods
        //
        //------------------------------------------------------
 
        #region Internal Methods
        static internal object Wrap(AutomationElement el, SafePatternHandle hPattern, bool cached) 
        { 
            if (hPattern.IsInvalid)
            { 
                throw new InvalidOperationException(SR.Get(SRID.CantPrefetchTextPattern));
            }

            return new TextPattern(el, hPattern); 
        }
 
        // compare two text patterns and return true if they are from the same logical element. 
        static internal bool Compare(TextPattern t1, TextPattern t2)
        { 
            return Misc.Compare(t1._element, t2._element);
        }

        #endregion Internal Methods 

        //----------------------------------------------------- 
        // 
        //  Private Fields
        // 
        //-----------------------------------------------------

        #region Private Fields
 
        private SafePatternHandle _hPattern;
        private AutomationElement _element; 
 
        #endregion Private Fields
    } 
}



// 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: Client-side wrapper for Text pattern 
//
// History: 
//  08/01/2003 : Micw Ported to WCP
//  02/09/2004 : a-davidj rewrote for Text Pattern redesign.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Diagnostics; 
using System.Security.Permissions;
using System.Windows.Automation.Provider; 
using System.Windows.Automation.Text;
using MS.Internal.Automation;

namespace System.Windows.Automation 
{
    ///  
    /// Purpose: 
    ///     The TextPattern object is what you get back when you ask an element for text pattern.
    /// Example usages: 
    ///     It is the Interface that represents text like an edit control. This pretty
    ///     much means any UI elements that contain text.
    /// 
#if (INTERNAL_COMPILE) 
    internal class TextPattern: BasePattern
#else 
    public class TextPattern: BasePattern 
#endif
    { 

        #region Constructors

        internal TextPattern(AutomationElement el, SafePatternHandle hPattern) 
            : base(el, hPattern)
        { 
            Debug.Assert(el != null); 
            Debug.Assert(!hPattern.IsInvalid);
 
            _hPattern = hPattern;
            _element = el;
        }
        #endregion Constructors 

        //----------------------------------------------------- 
        // 
        //  Public Constants / Readonly Fields
        // 
        //-----------------------------------------------------

        #region Public Constants and Readonly Fields
 
        /// 
        /// Indicates that a text attribute varies over a range. 
        ///  
        public static readonly object MixedAttributeValue = TextPatternIdentifiers.MixedAttributeValue;
 
        #region TextAttribute

        // IMPORTANT: if you add or remove AutomationTextAttributes be sure to make the corresponding changes in
        // AutomationComInteropProvider.cs' AutomationConstants struct and AutomationComInteropProvider.InitializeConstants. 

        /// Type of animation applied from AnimationStyle enum.  
        public static readonly AutomationTextAttribute AnimationStyleAttribute = TextPatternIdentifiers.AnimationStyleAttribute; 
        /// Background color as a 32-bit Win32 COLORREF.
        public static readonly AutomationTextAttribute BackgroundColorAttribute = TextPatternIdentifiers.BackgroundColorAttribute; 
        /// Bullet style from BulletStyle enum. 
        public static readonly AutomationTextAttribute BulletStyleAttribute = TextPatternIdentifiers.BulletStyleAttribute;
        /// Cap style from CapStyle enum.
        public static readonly AutomationTextAttribute CapStyleAttribute = TextPatternIdentifiers.CapStyleAttribute; 
        /// CultureInfo of the character down to sub-language level, e.g. Swiss French instead of French. See the CultureInfo in
        /// .NET Framework for more detail on the language code format. Clients should note that there may be many cases where the 
        /// Language of the character defaults to application UI language because many servers do not support language tag and, 
        /// even when supported, authors may not use it.
        public static readonly AutomationTextAttribute CultureAttribute = TextPatternIdentifiers.CultureAttribute; 
        /// Non-localized string that represents font face in TrueType. Providers can supply their own.
        /// Examples include �Arial Black� and �Arial Narrow�. 
        public static readonly AutomationTextAttribute FontNameAttribute = TextPatternIdentifiers.FontNameAttribute;
        /// Point size of the character as a double. 
        public static readonly AutomationTextAttribute FontSizeAttribute = TextPatternIdentifiers.FontSizeAttribute;
        /// Thickness of font as an int. This is modeled after the lfWeight field in GDI LOGFONT. For consistency, the following values 
        /// have been adopted from LOGFONT:0=DontCare, 100=Thin, 200=ExtraLight or UltraLight, 300=Light, 400=Normal or Regular, 
        /// 500=Medium, 600=SemiBold or DemiBold, 700=Bold, 800=ExtraBold or UltraBold, and 900=Heavy or Black.
        public static readonly AutomationTextAttribute FontWeightAttribute = TextPatternIdentifiers.FontWeightAttribute; 
        /// Color of the text as a 32-bit Win32 COLORREF.
        public static readonly AutomationTextAttribute ForegroundColorAttribute = TextPatternIdentifiers.ForegroundColorAttribute;
        /// Horizontal alignment from HorizontalTextAlignment enum. 
        public static readonly AutomationTextAttribute HorizontalTextAlignmentAttribute = TextPatternIdentifiers.HorizontalTextAlignmentAttribute; 
        /// First-line indentation in points as a double.
        public static readonly AutomationTextAttribute IndentationFirstLineAttribute = TextPatternIdentifiers.IndentationFirstLineAttribute; 
        /// Leading indentation in points as a double. 
        public static readonly AutomationTextAttribute IndentationLeadingAttribute = TextPatternIdentifiers.IndentationLeadingAttribute;
        /// Trailing indentation in points as a double. 
        public static readonly AutomationTextAttribute IndentationTrailingAttribute = TextPatternIdentifiers.IndentationTrailingAttribute;
        /// Is the text hidden?  Boolean.
        public static readonly AutomationTextAttribute IsHiddenAttribute = TextPatternIdentifiers.IsHiddenAttribute;
        /// Is the character italicized?  Boolean. 
        public static readonly AutomationTextAttribute IsItalicAttribute = TextPatternIdentifiers.IsItalicAttribute;
        /// Is the character read-only? If a document/file is read-only, but you can still edit it and save it as another file, 
        /// the text inside is considered not read-only.  Boolean. 
        public static readonly AutomationTextAttribute IsReadOnlyAttribute = TextPatternIdentifiers.IsReadOnlyAttribute;
        /// Is the character a sub-script? Boolean. 
        public static readonly AutomationTextAttribute IsSubscriptAttribute = TextPatternIdentifiers.IsSubscriptAttribute;
        /// Is the character a super-script?  Boolean.
        public static readonly AutomationTextAttribute IsSuperscriptAttribute = TextPatternIdentifiers.IsSuperscriptAttribute;
        /// Bottom margin in points as a double. 
        public static readonly AutomationTextAttribute MarginBottomAttribute = TextPatternIdentifiers.MarginBottomAttribute;
        /// Leading margin in points as a double. 
        public static readonly AutomationTextAttribute MarginLeadingAttribute = TextPatternIdentifiers.MarginLeadingAttribute; 
        /// Top margin in points as a double.
        public static readonly AutomationTextAttribute MarginTopAttribute = TextPatternIdentifiers.MarginTopAttribute; 
        /// Trailing margin in points as a double.
        public static readonly AutomationTextAttribute MarginTrailingAttribute = TextPatternIdentifiers.MarginTrailingAttribute;
        /// Outline style from OutlineStyles enum.
        public static readonly AutomationTextAttribute OutlineStylesAttribute = TextPatternIdentifiers.OutlineStylesAttribute; 
        /// Color of the overline as a Win32 COLORREF. This attribute may not be available if the color is
        /// always the same as the foreground color. 
        public static readonly AutomationTextAttribute OverlineColorAttribute = TextPatternIdentifiers.OverlineColorAttribute; 
        /// Overline style from TextDecorationLineStyle enum.
        public static readonly AutomationTextAttribute OverlineStyleAttribute = TextPatternIdentifiers.OverlineStyleAttribute; 
        /// Color of the strikethrough as a Win32 COLORREF. This attribute may not be available if the color is
        /// always the same as the foreground color.
        public static readonly AutomationTextAttribute StrikethroughColorAttribute = TextPatternIdentifiers.StrikethroughColorAttribute;
        /// Strikethrough style from TextDecorationLineStyle enum. 
        public static readonly AutomationTextAttribute StrikethroughStyleAttribute = TextPatternIdentifiers.StrikethroughStyleAttribute;
        /// The set of tabs in points relative to the leading margin. Array of double. 
        public static readonly AutomationTextAttribute TabsAttribute = TextPatternIdentifiers.TabsAttribute; 
        /// Text flow direction from FlowDirection flags enum.
        public static readonly AutomationTextAttribute TextFlowDirectionsAttribute = TextPatternIdentifiers.TextFlowDirectionsAttribute; 
        /// Color of the underline as a Win32 COLORREF. This attribute may not be available if the color is
        /// always the same as the foreground color.
        public static readonly AutomationTextAttribute UnderlineColorAttribute = TextPatternIdentifiers.UnderlineColorAttribute;
        /// Underline style from TextDecorationLineStyle enum. 
        public static readonly AutomationTextAttribute UnderlineStyleAttribute = TextPatternIdentifiers.UnderlineStyleAttribute;
 
        #endregion TextAttribute 

        #region Patterns & Events 

        /// Text pattern

        public static readonly AutomationPattern Pattern = TextPatternIdentifiers.Pattern; 

        ///  
        /// Event ID: TextSelectionChangedEvent 
        /// When:  Sent to the event handler when the selection changes.
        ///  

        public static readonly AutomationEvent TextSelectionChangedEvent =
            TextPatternIdentifiers.TextSelectionChangedEvent;
 
        /// 
        /// Event ID: TextChangedEvent 
        /// When:  Sent to the event handler when text changes. 
        /// 
 
        public static readonly AutomationEvent TextChangedEvent =
            TextPatternIdentifiers.TextChangedEvent;

        #endregion Patterns & Events 

        #endregion Public Constants and Readonly Fields 
 
        //------------------------------------------------------
        // 
        //  Public Methods
        //
        //-----------------------------------------------------
 
        #region Public Methods
 
        ///  
        /// Retrieves the current selection.
        ///  
        /// The range of text that is selected, or possibly null if there is
        /// no selection.
        public TextPatternRange [] GetSelection()
        { 
            SafeTextRangeHandle [] hTextRanges = UiaCoreApi.TextPattern_GetSelection(_hPattern);
            return TextPatternRange.Wrap(hTextRanges, this); 
        } 

        ///  
        /// Retrieves the visible range within the container
        /// 
        /// The range of text that is visible within the container.  Note that the
        /// text of the range could be obscured by an overlapping window.  Also, portions 
        /// of the range at the beginning, in the middle, or at the end may not be visible
        /// because they are scrolled off to the side. 
        public TextPatternRange [] GetVisibleRanges() 
        {
            SafeTextRangeHandle [] hTextRanges = UiaCoreApi.TextPattern_GetVisibleRanges(_hPattern); 
            return TextPatternRange.Wrap(hTextRanges, this);
        }

        ///  
        /// Retrieves the range of a child object.
        ///  
        /// The child element.  If the element is not 
        /// a child of the text container then an InvalidOperation exception is
        /// thrown. 
        /// A range that spans the child element.
        public TextPatternRange RangeFromChild(AutomationElement childElement)
        {
            if (childElement == null) 
            {
                throw new ArgumentNullException("childElement"); 
            } 
            SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_RangeFromChild(_hPattern, childElement.RawNode);
            return TextPatternRange.Wrap(hTextRange, this); 
        }
        /// 
        /// Finds the range nearest to a screen coordinate.
        /// If the coordinate is within the bounding rectangle of a character then the 
        /// range will contain that character.  Otherwise, it will be a degenerate
        /// range near the point, chosen in an implementation-dependent manner. 
        /// An InvalidOperation exception is thrown if the point is outside of the 
        /// client area of the text container.
        ///  
        /// The location in screen coordinates.
        /// A degenerate range nearest the specified location.
        public TextPatternRange RangeFromPoint(Point screenLocation)
        { 
            //If we are not within the client area throw an exception
            Rect rect = (Rect)_element.GetCurrentPropertyValue(AutomationElement.BoundingRectangleProperty); 
            if (screenLocation.X < rect.Left || screenLocation.X >= rect.Right || screenLocation.Y < rect.Top || screenLocation.Y >= rect.Bottom) 
            {
                throw new ArgumentException(SR.Get(SRID.ScreenCoordinatesOutsideBoundingRect)); 
            }

            SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_RangeFromPoint(_hPattern, screenLocation);
            return TextPatternRange.Wrap(hTextRange, this); 
        }
 
        #endregion Public Methods 

        //------------------------------------------------------ 
        //
        //  Public Properties
        //
        //------------------------------------------------------ 

        #region Public Properties 
 
        /// 
        /// A text range that encloses the main text of the document.  Some auxillary text such as 
        /// headers, footnotes, or annotations may not be included.
        /// 
        public TextPatternRange DocumentRange
        { 
            get
            { 
                SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_get_DocumentRange(_hPattern); 
                return TextPatternRange.Wrap(hTextRange, this);
            } 
        }

        /// 
        /// True if the text container supports text selection. If it does then 
        /// you may use the GetSelection and TextPatternRange.Select methods.
        ///  
        public SupportedTextSelection SupportedTextSelection 
        {
            get 
            {
                return UiaCoreApi.TextPattern_get_SupportedTextSelection(_hPattern);
            }
        } 

        #endregion Public Properties 
 
        //-----------------------------------------------------
        // 
        //  Internal Methods
        //
        //------------------------------------------------------
 
        #region Internal Methods
        static internal object Wrap(AutomationElement el, SafePatternHandle hPattern, bool cached) 
        { 
            if (hPattern.IsInvalid)
            { 
                throw new InvalidOperationException(SR.Get(SRID.CantPrefetchTextPattern));
            }

            return new TextPattern(el, hPattern); 
        }
 
        // compare two text patterns and return true if they are from the same logical element. 
        static internal bool Compare(TextPattern t1, TextPattern t2)
        { 
            return Misc.Compare(t1._element, t2._element);
        }

        #endregion Internal Methods 

        //----------------------------------------------------- 
        // 
        //  Private Fields
        // 
        //-----------------------------------------------------

        #region Private Fields
 
        private SafePatternHandle _hPattern;
        private AutomationElement _element; 
 
        #endregion Private Fields
    } 
}



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

                        

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