ComboBoxAutomationPeer.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 / ComboBoxAutomationPeer.cs / 1 / ComboBoxAutomationPeer.cs
                        
                        
                            using System; 
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Security; 
using System.Text;
using System.Windows; 
using System.Windows.Automation.Provider; 
using System.Windows.Controls;
using System.Windows.Controls.Primitives; 
using System.Windows.Interop;
using System.Windows.Media;

using MS.Internal; 
using MS.Win32;
 
namespace System.Windows.Automation.Peers 
{
 
    ///
    public class ComboBoxAutomationPeer: SelectorAutomationPeer, IValueProvider, IExpandCollapseProvider
    {
        /// 
        public ComboBoxAutomationPeer(ComboBox owner): base(owner)
        {} 
 
        ///
        override protected ItemAutomationPeer CreateItemAutomationPeer(object item) 
        {
            // Use the same peer as ListBox
            return new ListBoxItemAutomationPeer(item, this);
        } 

        /// 
        override protected AutomationControlType GetAutomationControlTypeCore() 
        {
            return AutomationControlType.ComboBox; 
        }

        ///
        override protected string GetClassNameCore() 
        {
            return "ComboBox"; 
        } 

        /// 
        override public object GetPattern(PatternInterface pattern)
        {
            object iface = null;
 
            if (pattern == PatternInterface.Value)
            { 
                ComboBox owner = (ComboBox)Owner; 
                if (owner.IsEditable) iface = this;
            } 
            else if(pattern == PatternInterface.ExpandCollapse)
            {
                iface = this;
            } 
            else
            { 
                iface = base.GetPattern(pattern); 
            }
 
            return iface;
        }

        /// 
        protected override List GetChildrenCore()
        { 
            List children = base.GetChildrenCore(); 

            //  include text box part into children collection 
            ComboBox owner = (ComboBox)Owner;
            TextBox textBox = owner.EditableTextBoxSite;
            if (textBox != null)
            { 
                AutomationPeer peer = UIElementAutomationPeer.CreatePeerForElement(textBox);
                if (peer != null) 
                { 
                    if (children == null)
                        children = new List(); 

                    children.Insert(0, peer);
                }
            } 

            return children; 
        } 

        #region Value 

        /// 
        /// Request to set the value that this UI element is representing
        ///  
        /// Value to set the UI to, as an object
        /// true if the UI element was successfully set to the specified value 
        //[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647 
        void IValueProvider.SetValue(string val)
        { 
            if (val == null)
                throw new ArgumentNullException("val");

            ComboBox owner = (ComboBox)Owner; 

            if (!owner.IsEnabled) 
                throw new ElementNotEnabledException(); 

            owner.Text = val; 
        }

        ///Value of a value control, as a a string.
        string IValueProvider.Value 
        {
            get 
            { 
                return ((ComboBox)(((ComboBoxAutomationPeer)this).Owner)).Text;
            } 
        }


        ///Indicates that the value can only be read, not modified. 
        ///returns True if the control is read-only
        bool IValueProvider.IsReadOnly 
        { 
            get
            { 
                ComboBox owner = (ComboBox)Owner;
                return !owner.IsEnabled || owner.IsReadOnly;
            }
        } 

        #endregion Value 
 
        #region ExpandCollapse
        ///  
        /// Blocking method that returns after the element has been expanded.
        /// 
        /// true if the node was successfully expanded
        void IExpandCollapseProvider.Expand() 
        {
            if(!IsEnabled()) 
                throw new ElementNotEnabledException(); 

            ComboBox owner = (ComboBox)((ComboBoxAutomationPeer)this).Owner; 
            owner.IsDropDownOpen = true;
        }

 
        /// 
        /// Blocking method that returns after the element has been collapsed. 
        ///  
        /// true if the node was successfully collapsed
        void IExpandCollapseProvider.Collapse() 
        {
            if(!IsEnabled())
                throw new ElementNotEnabledException();
 
            ComboBox owner = (ComboBox)((ComboBoxAutomationPeer)this).Owner;
            owner.IsDropDownOpen = false; 
        } 

 
        ///indicates an element's current Collapsed or Expanded state
        ExpandCollapseState IExpandCollapseProvider.ExpandCollapseState
        {
            get 
            {
                ComboBox owner = (ComboBox)((ComboBoxAutomationPeer)this).Owner; 
                return owner.IsDropDownOpen ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed; 
            }
        } 

        //
        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]
        internal void RaiseExpandCollapseAutomationEvent(bool oldValue, bool newValue) 
        {
            RaisePropertyChangedEvent( 
                ExpandCollapsePatternIdentifiers.ExpandCollapseStateProperty, 
                oldValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed,
                newValue ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed); 
        }


        #endregion ExpandCollapse 

 
    } 
}
 



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

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