AttachedPropertyBrowsableWhenAttributePresentAttribute.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 / Base / System / Windows / AttachedPropertyBrowsableWhenAttributePresentAttribute.cs / 1 / AttachedPropertyBrowsableWhenAttributePresentAttribute.cs
                        

                        
                             
namespace System.Windows
{
    using System;
    using System.ComponentModel; 

    ///  
    ///     This attribute declares that an attached property can only be attached 
    ///     to an object that defines the given attribute on its class.
    ///  
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public sealed class AttachedPropertyBrowsableWhenAttributePresentAttribute : AttachedPropertyBrowsableAttribute
    {
        //------------------------------------------------------ 
        //
        //  Constructors 
        // 
        //-----------------------------------------------------
 

        /// 
        ///     Creates a new AttachedPropertyBrowsableWhenAttributePresentAttribute.  Provide
        ///     the type of attribute that, when present on a dependency object, 
        ///     should make the property browsable.
        ///  
        public AttachedPropertyBrowsableWhenAttributePresentAttribute(Type attributeType) 
        {
            if (attributeType == null) throw new ArgumentNullException("attributeType"); 

            _attributeType = attributeType;
        }
 

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


        ///  
        ///     Returns the attribute type passed into the constructor.
        ///  
        public Type AttributeType 
        {
            get 
            {
                return _attributeType;
            }
        } 

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

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

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

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


        ///  
        ///     Returns true if the dependency object class defines an attribute
        ///     of the same type contained in this attribute.  The attribute must 
        ///     differ from the "default" state of the attribute. 
        /// 
        internal override bool IsBrowsable(DependencyObject d, DependencyProperty dp) 
        {
            if (d == null) throw new ArgumentNullException("d");
            if (dp == null) throw new ArgumentNullException("dp");
 
            Attribute a = TypeDescriptor.GetAttributes(d)[_attributeType];
            return (a != null && !a.IsDefaultAttribute()); 
        } 

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

        private Type _attributeType; 
    } 
}
 

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

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