DataGridColumnHeaderItemAutomationPeer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Automation / Peers / DataGridColumnHeaderItemAutomationPeer.cs / 1305600 / DataGridColumnHeaderItemAutomationPeer.cs
                        
                        
                            using System; 
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Automation; 
using System.Windows.Automation.Provider;
using System.Windows.Controls; 
using System.Windows.Controls.Primitives; 
using System.Windows.Data;
 
namespace System.Windows.Automation.Peers
{
    /// 
    /// Automation Peer for DataGridHeader 
    /// 
    public class DataGridColumnHeaderItemAutomationPeer : ItemAutomationPeer, 
        IInvokeProvider, IScrollItemProvider, ITransformProvider, IVirtualizedItemProvider 
    {
        public DataGridColumnHeaderItemAutomationPeer(object item, DataGridColumn column, DataGridColumnHeadersPresenterAutomationPeer peer) 
            :base(item, peer)
        {
            _column = column;
        } 

        #region AutomationPeer Overrides 
 
        /// 
        /// Gets the control type for the element that is associated with the UI Automation peer. 
        /// 
        /// The control type.
        protected override AutomationControlType GetAutomationControlTypeCore()
        { 
            return AutomationControlType.HeaderItem;
        } 
 
        /// 
        /// Called by GetClassName that gets a human readable name that, in addition to AutomationControlType, 
        /// differentiates the control represented by this AutomationPeer.
        /// 
        /// The string that contains the name.
        protected override string GetClassNameCore() 
        {
            AutomationPeer wrapperPeer = GetWrapperPeer(); 
            if (wrapperPeer != null) 
            {
                return wrapperPeer.GetClassName(); 
            }
            else
            {
                ThrowElementNotAvailableException(); 
            }
            return String.Empty; 
        } 

        ///  
        /// Gets the control pattern that is associated with the specified System.Windows.Automation.Peers.PatternInterface.
        /// 
        /// A value from the System.Windows.Automation.Peers.PatternInterface enumeration.
        /// The object that supports the specified pattern, or null if unsupported. 
        public override object GetPattern(PatternInterface patternInterface)
        { 
            switch (patternInterface) 
            {
                case PatternInterface.Invoke: 
                    {
                        if (Column != null && Column.CanUserSort)
                        {
                            return this; 
                        }
 
                        break; 
                    }
 
                case PatternInterface.ScrollItem:
                    {
                        if (Column != null)
                        { 
                            return this;
                        } 
                        break; 
                    }
 
                case PatternInterface.Transform:
                    {
                        if (Column != null && Column.CanUserResize)
                        { 
                            return this;
                        } 
 
                        break;
                    } 
                case PatternInterface.VirtualizedItem:
                    {
                        if (Column != null)
                        { 
                            return this;
                        } 
 
                        break;
                    } 
            }

            return null;
        } 

        ///  
        /// Gets a value that specifies whether the element is a content element. 
        /// 
        /// true if the element is a content element; otherwise false 
        protected override bool IsContentElementCore()
        {
            return false;
        } 
        #endregion
 
        #region IInvokeProvider 
        void IInvokeProvider.Invoke()
        { 
            UIElementAutomationPeer wrapperPeer = GetWrapperPeer() as UIElementAutomationPeer;
            if (wrapperPeer != null)
            {
                ((DataGridColumnHeader)wrapperPeer.Owner).Invoke(); 
            }
            else 
                ThrowElementNotAvailableException(); 
        }
        #endregion 

        #region IScrollItemProvider

        void IScrollItemProvider.ScrollIntoView() 
        {
            if (Column != null && this.OwningDataGrid != null) 
            { 
                this.OwningDataGrid.ScrollIntoView(null, Column);
            } 
        }

        #endregion
 
        #region ITransformProvider
 
        bool ITransformProvider.CanMove 
        {
            get 
            {
                return false;
            }
        } 

        bool ITransformProvider.CanResize 
        { 
            get
            { 
                if (this.Column != null)
                    return Column.CanUserResize;
                return false;
            } 
        }
 
        bool ITransformProvider.CanRotate 
        {
            get 
            {
                return false;
            }
        } 

        void ITransformProvider.Move(double x, double y) 
        { 
            throw new InvalidOperationException(SR.Get(SRID.DataGridColumnHeaderItemAutomationPeer_Unsupported));
        } 

        void ITransformProvider.Resize(double width, double height)
        {
            if (this.OwningDataGrid != null && Column.CanUserResize) 
            {
                Column.Width = new DataGridLength(width); 
            } 
            else
            { 
                throw new InvalidOperationException(SR.Get(SRID.DataGridColumnHeaderItemAutomationPeer_Unresizable));
            }
        }
 
        void ITransformProvider.Rotate(double degrees)
        { 
            throw new InvalidOperationException(SR.Get(SRID.DataGridColumnHeaderItemAutomationPeer_Unsupported)); 
        }
 
        #endregion

        #region IVirtualizedItemProvider
        void IVirtualizedItemProvider.Realize() 
        {
            if (this.OwningDataGrid != null) 
                OwningDataGrid.ScrollIntoView(null,Column); 
        }
 
        #endregion

        #region Properties
 
        internal override bool AncestorsInvalid
        { 
            get { return base.AncestorsInvalid; } 
            set
            { 
                base.AncestorsInvalid = value;
                if (value)
                    return;
                AutomationPeer wrapperPeer = OwningColumnHeaderPeer; 
                if (wrapperPeer != null)
                { 
                    wrapperPeer.AncestorsInvalid = false; 
                }
            } 
        }

        internal DataGridColumnHeader OwningHeader
        { 
            get
            { 
                return GetWrapper() as DataGridColumnHeader; 
            }
        } 

        internal DataGrid OwningDataGrid
        {
            get 
            {
                return Column.DataGridOwner; 
            } 
        }
 
        internal DataGridColumn Column
        {
            get { return _column; }
        } 

        internal DataGridColumnHeaderAutomationPeer OwningColumnHeaderPeer 
        { 
            get
            { 
                return GetWrapperPeer() as DataGridColumnHeaderAutomationPeer;
            }
        }
 
        #endregion
 
        #region Private Variables 
        DataGridColumn _column;
        #endregion 
    }
}

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

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