DataGridViewTopRowAccessibleObject.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridViewTopRowAccessibleObject.cs / 1305376 / DataGridViewTopRowAccessibleObject.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System.Security.Permissions; 
using System.Drawing; 
using System.Diagnostics;
 
namespace System.Windows.Forms
{
    public partial class DataGridView
    { 
        /// 
        [ 
            System.Runtime.InteropServices.ComVisible(true) 
        ]
        protected class DataGridViewTopRowAccessibleObject : AccessibleObject 
        {
            DataGridView owner;

            ///  
            public DataGridViewTopRowAccessibleObject() : base()
            { 
            } 

            ///  
            public DataGridViewTopRowAccessibleObject(DataGridView owner) : base()
            {
                this.owner = owner;
            } 

            ///  
            public override Rectangle Bounds 
            {
                get 
                {
                    if (this.owner == null)
                    {
                        throw new InvalidOperationException(SR.GetString(SR.DataGridViewTopRowAccessibleObject_OwnerNotSet)); 
                    }
                    if (this.owner.ColumnHeadersVisible) 
                    { 
                        Rectangle rect = Rectangle.Union(this.owner.layout.ColumnHeaders, this.owner.layout.TopLeftHeader);
                        return this.owner.RectangleToScreen(rect); 
                    }
                    else
                    {
                        return Rectangle.Empty; 
                    }
                } 
            } 

            ///  
            public override string Name
            {
                get
                { 
                    return SR.GetString(SR.DataGridView_AccTopRow);
                } 
            } 

            ///  
            public DataGridView Owner
            {
                get
                { 
                    return this.owner;
                } 
                set 
                {
                    if (this.owner != null) 
                    {
                        throw new InvalidOperationException(SR.GetString(SR.DataGridViewTopRowAccessibleObject_OwnerAlreadySet));
                    }
                    this.owner = value; 
                }
            } 
 
            /// 
            public override AccessibleObject Parent 
            {
                [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
                get
                { 
                    if (this.owner == null)
                    { 
                        throw new InvalidOperationException(SR.GetString(SR.DataGridViewTopRowAccessibleObject_OwnerNotSet)); 
                    }
                    return this.owner.AccessibilityObject; 
                }
            }

            ///  
            public override AccessibleRole Role
            { 
                get 
                {
                    return AccessibleRole.Row; 
                }
            }

            ///  
            public override string Value
            { 
                [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] 
                get
                { 
                    return this.Name;
                }
            }
 
            /// 
            public override AccessibleObject GetChild(int index) 
            { 
                if (this.owner == null)
                { 
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewTopRowAccessibleObject_OwnerNotSet));
                }

                if (index < 0) 
                {
                    throw new ArgumentOutOfRangeException("index"); 
                } 

                if (index == 0 && this.owner.RowHeadersVisible) 
                {
                    return this.owner.TopLeftHeaderCell.AccessibilityObject;
                }
 
                if (this.owner.RowHeadersVisible)
                { 
                    // decrement the index because the first child is the top left header cell 
                    index --;
                } 

                Debug.Assert(index >= 0);

                if (index < this.owner.Columns.GetColumnCount(DataGridViewElementStates.Visible)) 
                {
                    int actualColumnIndex = this.owner.Columns.ActualDisplayIndexToColumnIndex(index, DataGridViewElementStates.Visible); 
                    return this.owner.Columns[actualColumnIndex].HeaderCell.AccessibilityObject; 
                }
                else 
                {
                    return null;
                }
            } 

            ///  
            public override int GetChildCount() 
            {
                if (this.owner == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewTopRowAccessibleObject_OwnerNotSet));
                }
                int result = this.owner.Columns.GetColumnCount(DataGridViewElementStates.Visible); 
                if (this.owner.RowHeadersVisible)
                { 
                    // + 1 is the top left header cell accessibility object 
                    result ++;
                } 

                return result;
            }
 
            /// 
            [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] 
            public override AccessibleObject Navigate(AccessibleNavigation navigationDirection) 
            {
                if (this.owner == null) 
                {
                    throw new InvalidOperationException(SR.GetString(SR.DataGridViewTopRowAccessibleObject_OwnerNotSet));
                }
                switch (navigationDirection) 
                {
                    case AccessibleNavigation.Down: 
                    case AccessibleNavigation.Next: 
                        if (this.owner.AccessibilityObject.GetChildCount() > 1)
                        { 
                            return this.owner.AccessibilityObject.GetChild(1);
                        }
                        else
                        { 
                            return null;
                        } 
                    case AccessibleNavigation.FirstChild: 
                        return this.GetChild(0);
                    case AccessibleNavigation.LastChild: 
                        return this.GetChild(this.GetChildCount() - 1);
                    default:
                        return null;
                } 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DataGridViewTopRowAccessibleObject.cs source code in C# .NET

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