GridPattern.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / UIAutomationClient / System / Windows / Automation / GridPattern.cs / 1 / GridPattern.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Client-side wrapper for Grid Pattern 
//
// History: 
//  06/23/2003 : [....] Ported to WCP
//
//---------------------------------------------------------------------------
 
using System;
using System.Windows.Automation.Provider; 
using MS.Internal.Automation; 

namespace System.Windows.Automation 
{
    ///
#if (INTERNAL_COMPILE)
    internal class GridPattern: BasePattern 
#else
    public class GridPattern: BasePattern 
#endif 
    {
        //----------------------------------------------------- 
        //
        //  Constructors
        //
        //----------------------------------------------------- 

        #region Constructors 
 
        internal GridPattern(AutomationElement el, SafePatternHandle hPattern, bool cached)
            : base(el, hPattern) 
        {
            _hPattern = hPattern;
            _cached = cached;
        } 

        #endregion Constructors 
 

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

        #region Public Constants and Readonly Fields 
 
        /// Grid pattern
        public static readonly AutomationPattern Pattern = GridPatternIdentifiers.Pattern; 

        /// RowCount
        public static readonly AutomationProperty RowCountProperty = GridPatternIdentifiers.RowCountProperty;
 
        /// ColumnCount
        public static readonly AutomationProperty ColumnCountProperty = GridPatternIdentifiers.ColumnCountProperty; 
 
        #endregion Public Constants and Readonly Fields
 

        //------------------------------------------------------
        //
        //  Public Methods 
        //
        //------------------------------------------------------ 
 
        #region Public Methods
        ///  
        /// Obtain the AutomationElement at an zero based absolute position in the grid.
        /// Where 0,0 is top left
        /// 
        /// Row of item to get 
        /// Column of item to get
        /// 
        ///  
        /// This API does not work inside the secure execution environment.
        ///  
        /// 
        public AutomationElement GetItem(int row, int column)
        {
            SafeNodeHandle hNode = UiaCoreApi.GridPattern_GetItem(_hPattern, row, column); 
            return AutomationElement.Wrap(hNode);
        } 
 
        #endregion Public Methods
 

        //-----------------------------------------------------
        //
        //  Public Properties 
        //
        //------------------------------------------------------ 
 
        #region Public Properties
        ///  
        /// This member allows access to previously requested
        /// cached properties for this element. The returned object
        /// has accessors for each property defined for this pattern.
        ///  
        /// 
        /// Cached property values must have been previously requested 
        /// using a CacheRequest. If you try to access a cached 
        /// property that was not previously requested, an InvalidOperation
        /// Exception will be thrown. 
        ///
        /// To get the value of a property at the current point in time,
        /// access the property via the Current accessor instead of
        /// Cached. 
        /// 
        public GridPatternInformation Cached 
        { 
            get
            { 
                Misc.ValidateCached(_cached);
                return new GridPatternInformation(_el, true);
            }
        } 

        ///  
        /// This member allows access to current property values 
        /// for this element. The returned object has accessors for
        /// each property defined for this pattern. 
        /// 
        /// 
        /// This pattern must be from an AutomationElement with a
        /// Full reference in order to get current values. If the 
        /// AutomationElement was obtained using AutomationElementMode.None,
        /// then it contains only cached data, and attempting to get 
        /// the current value of any property will throw an InvalidOperationException. 
        ///
        /// To get the cached value of a property that was previously 
        /// specified using a CacheRequest, access the property via the
        /// Cached accessor instead of Current.
        /// 
        public GridPatternInformation Current 
        {
            get 
            { 
                Misc.ValidateCurrent(_hPattern);
                return new GridPatternInformation(_el, false); 
            }
        }

        #endregion Public Properties 

 
        //----------------------------------------------------- 
        //
        //  Internal Methods 
        //
        //-----------------------------------------------------

        #region Internal Methods 

        internal static object Wrap(AutomationElement el, SafePatternHandle hPattern, bool cached) 
        { 
            return new GridPattern( el, hPattern, cached );
        } 

        #endregion Internal Methods

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

        #region Private Fields

        internal SafePatternHandle _hPattern; 
        internal bool _cached; // internal, since protected makes this publically visible
 
        #endregion Private Fields 

 
        //-----------------------------------------------------
        //
        //  Nested Classes
        // 
        //------------------------------------------------------
 
        #region Nested Classes 

        ///  
        /// This class provides access to either Cached or Current
        /// properties on a pattern via the pattern's .Cached or
        /// .Current accessors.
        ///  
        public struct GridPatternInformation
        { 
            //------------------------------------------------------ 
            //
            //  Constructors 
            //
            //-----------------------------------------------------

            #region Constructors 

            internal GridPatternInformation(AutomationElement el, bool useCache) 
            { 
                _el = el;
                _useCache = useCache; 
            }

            #endregion Constructors
 

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

            #region Public Properties
 
            /// 
            /// number of rows in the grid 
            ///  
            ///
            ///  
            /// This API does not work inside the secure execution environment.
            /// 
            /// 
            public int RowCount 
            {
                get 
                { 
                    return (int)_el.GetPatternPropertyValue(RowCountProperty, _useCache);
                } 
            }

            /// 
            /// number of columns in the grid 
            /// 
            /// 
            ///  
            /// This API does not work inside the secure execution environment.
            ///  
            /// 
            public int ColumnCount
            {
                get 
                {
                    return (int)_el.GetPatternPropertyValue(ColumnCountProperty, _useCache); 
                } 
            }
 
            #endregion Public Properties

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

            #region Private Fields 

            private AutomationElement _el; // AutomationElement that contains the cache or live reference
            private bool _useCache; // true to use cache, false to use live reference to get current values
 
            #endregion Private Fields
        } 
        #endregion Nested Classes 
    }
} 

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