AttachedPropertyBrowsableForChildrenAttribute.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / AttachedPropertyBrowsableForChildrenAttribute.cs / 1 / AttachedPropertyBrowsableForChildrenAttribute.cs
                        

                        
                            namespace System.Windows
{
    using System;
 
    /// 
    ///     This attribute declares that a property is visible when the 
    ///     property owner is a parent of another element.  For example, 
    ///     Canvas.Left is only useful on elements parented within the
    ///     canvas.  The class supports two types of tree walks:  a shallow 
    ///     walk, the default which requires that the immediate parent be the
    ///     owner type of the property, and a deep walk, declared by setting
    ///     IncludeDescendants to true and requires that the owner type be
    ///     somewhere in the parenting hierarchy. 
    /// 
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)] 
    public sealed class AttachedPropertyBrowsableForChildrenAttribute : AttachedPropertyBrowsableAttribute 
    {
        //------------------------------------------------------ 
        //
        //  Constructors
        //
        //----------------------------------------------------- 

 
        ///  
        ///     Creates a new AttachedPropertyBrowsableForChildrenAttribute.
        ///  
        public AttachedPropertyBrowsableForChildrenAttribute()
        {
        }
 

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


        ///  
        ///     Gets or sets if the property should be browsable for just the
        ///     immediate children (false) or all children (true). 
        ///  
        public bool IncludeDescendants
        { 
            get
            {
                return _includeDescendants;
            } 
            set
            { 
                _includeDescendants = value; 
            }
        } 


        //------------------------------------------------------
        // 
        //  Public Methods
        // 
        //----------------------------------------------------- 

        ///  
        ///     Overrides Object.Equals to implement correct equality semantics for this
        ///     attribute.
        /// 
        public override bool Equals(object obj) 
        {
            AttachedPropertyBrowsableForChildrenAttribute other = obj as AttachedPropertyBrowsableForChildrenAttribute; 
            if (other == null) return false; 
            return _includeDescendants == other._includeDescendants;
        } 

        /// 
        ///     Overrides Object.GetHashCode to implement correct hashing semantics.
        ///  
        public override int GetHashCode()
        { 
            return _includeDescendants.GetHashCode(); 
        }
 

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

        ///  
        ///     Returns true if the object provided is the immediate logical
        ///     child (if IncludeDescendants is false) or any logical child
        ///     (if IncludeDescendants is true).
        ///  
        internal override bool IsBrowsable(DependencyObject d, DependencyProperty dp)
        { 
            if (d == null) throw new ArgumentNullException("d"); 
            if (dp == null) throw new ArgumentNullException("dp");
 
            DependencyObject walk = d;
            Type ownerType = dp.OwnerType;

            do 
            {
                walk = FrameworkElement.GetFrameworkParent(walk); 
 
                if (walk != null && ownerType.IsInstanceOfType(walk))
                { 
                    return true;
                }
            }
            while (_includeDescendants && walk != null); 

            return false; 
        } 

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

        private bool _includeDescendants; 
    } 
}
 

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

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