EventManager.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / EventManager.cs / 2 / EventManager.cs
                        
                        
                            using System; 
using System.Diagnostics;
using MS.Internal.PresentationCore;
using MS.Utility;
using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;
 
namespace System.Windows 
{
 
    /// 
    ///     Allows management of RoutedEvents
    /// 
    ///  
    public static class EventManager
    { 
        #region External API 

        ///  
        ///     Registers a 
        ///     with the given parameters
        /// 
        ///  
        ///      must be
        ///     unique within the  
        ///     (super class types not considered when talking about 
        ///     uniqueness) and cannot be null 
        ///      must be a 
        ///     type of delegate and cannot be null 
        ///      must be any
        ///     object type and cannot be null 
        ///      
        ///
        ///     NOTE: Caller must be the static constructor of the 
        ///      - 
        ///     enforced by stack walk
        ///  
        /// 
        ///     
        /// 
        ///  
        ///     
        ///  
        ///  
        ///     
        ///  
        /// 
        ///     
        /// 
        ///  
        ///     The new registered 
        ///  
        ///  
        public static RoutedEvent RegisterRoutedEvent(
            string name, 
            RoutingStrategy routingStrategy,
            Type handlerType,
            Type ownerType)
        { 
            if (name == null)
            { 
                throw new ArgumentNullException("name"); 
            }
 
            if (routingStrategy != RoutingStrategy.Tunnel &&
                routingStrategy != RoutingStrategy.Bubble &&
                routingStrategy != RoutingStrategy.Direct)
            { 
                throw new System.ComponentModel.InvalidEnumArgumentException("routingStrategy", (int)routingStrategy, typeof(RoutingStrategy));
            } 
 
            if (handlerType == null)
            { 
                throw new ArgumentNullException("handlerType");
            }

            if (ownerType == null) 
            {
                throw new ArgumentNullException("ownerType"); 
            } 

            if (GlobalEventManager.GetRoutedEventFromName(name, ownerType, false) != null) 
            {
                throw new ArgumentException(SR.Get(SRID.DuplicateEventName, name, ownerType));
            }
 
            return GlobalEventManager.RegisterRoutedEvent(name, routingStrategy, handlerType, ownerType);
        } 
 
        /// 
        ///     See overloaded method for details 
        /// 
        /// 
        ///     handledEventsToo defaults to false
        ///     See overloaded method for details 
        /// 
        ///  
        ///  
        /// 
        ///  
        public static void RegisterClassHandler(
            Type classType,
            RoutedEvent routedEvent,
            Delegate handler) 
        {
            // HandledEventToo defaults to false 
            // Call forwarded 
            RegisterClassHandler(classType, routedEvent, handler, false);
        } 

        /// 
        ///     Add a routed event handler to all instances of a
        ///     particular type inclusive of its sub-class types 
        /// 
        ///  
        ///     The handlers added thus are also known as 
        ///     an class handlers 
        ///      
        ///
        ///     Class handlers are invoked before the
        ///     instance handlers. Also see
        ///       
        ///     Sub-class class handlers are invoked before
        ///     the super-class class handlers  
        ///      
        ///
        ///     Input parameters classType,  
        ///     and handler cannot be null 
        ///     handledEventsToo input parameter when false means
        ///     that listener does not care about already handled events.
        ///     Hence the handler will not be invoked on the target if 
        ///     the RoutedEvent has already been
        ///       
        ///     handledEventsToo input parameter when true means 
        ///     that the listener wants to hear about all events even if
        ///     they have already been handled. Hence the handler will 
        ///     be invoked irrespective of the event being
        ///     
        /// 
        ///  
        ///     Target object type on which the handler will be invoked
        ///     when the RoutedEvent is raised 
        ///  
        /// 
        ///      for which the handler 
        ///     is attached
        /// 
        /// 
        ///     The handler that will be invoked on the target object 
        ///     when the RoutedEvent is raised
        ///  
        ///  
        ///     Flag indicating whether or not the listener wants to
        ///     hear about events that have already been handled 
        /// 
        /// 
        public static void RegisterClassHandler(
            Type classType, 
            RoutedEvent routedEvent,
            Delegate handler, 
            bool handledEventsToo) 
        {
            if (classType == null) 
            {
                throw new ArgumentNullException("classType");
            }
 
            if (routedEvent == null)
            { 
                throw new ArgumentNullException("routedEvent"); 
            }
 
            if (handler == null)
            {
                throw new ArgumentNullException("handler");
            } 

            if (!typeof(UIElement).IsAssignableFrom(classType) && 
                !typeof(ContentElement).IsAssignableFrom(classType) && 
                !typeof(UIElement3D).IsAssignableFrom(classType))
            { 
                throw new ArgumentException(SR.Get(SRID.ClassTypeIllegal));
            }

            if (!routedEvent.IsLegalHandler(handler)) 
            {
                throw new ArgumentException(SR.Get(SRID.HandlerTypeIllegal)); 
            } 

            GlobalEventManager.RegisterClassHandler(classType, routedEvent, handler, handledEventsToo); 
        }

        /// 
        ///     Returns s 
        ///     that have been registered so far
        ///  
        ///  
        ///     Also see
        ///      
        ///     
        ///     
        ///
        ///     NOTE: There may be more 
        ///     s registered later
        ///  
        ///  
        ///     The s
        ///     that have been registered so far 
        /// 
        /// 
        public static RoutedEvent[] GetRoutedEvents()
        { 
            return GlobalEventManager.GetRoutedEvents();
        } 
 
        /// 
        ///     Finds s for the 
        ///     given 
        /// 
        /// 
        ///     More specifically finds 
        ///     s starting
        ///     on the  
        ///     and looking at its super class types  
        ///     
        /// 
        ///     If no matches are found, this method returns null
        /// 
        /// 
        ///      to start 
        ///     search with and follow through to super class types
        ///  
        ///  
        ///     Matching s
        ///  
        /// 
        public static RoutedEvent[] GetRoutedEventsForOwner(Type ownerType)
        {
            if (ownerType == null) 
            {
                throw new ArgumentNullException("ownerType"); 
            } 

            return GlobalEventManager.GetRoutedEventsForOwner(ownerType); 
        }

        /// 
        ///     Finds a  with a 
        ///     matching 
        ///     and  
        ///  
        /// 
        ///     More specifically finds a 
        ///      with a matching
        ///      starting
        ///     on the 
        ///     and looking at its super class types  
        ///     
        /// 
        ///     If no matches are found, this method returns null 
        /// 
        ///  
        ///      to be matched
        /// 
        /// 
        ///      to start 
        ///     search with and follow through to super class types
        ///  
        ///  
        ///     Matching 
        ///  
        [FriendAccessAllowed]
        internal static RoutedEvent GetRoutedEventFromName(string name, Type ownerType)
        {
            if (name == null) 
            {
                throw new ArgumentNullException("name"); 
            } 

            if (ownerType == null) 
            {
                throw new ArgumentNullException("ownerType");
            }
 
            return GlobalEventManager.GetRoutedEventFromName(name, ownerType, true);
        } 
 
        #endregion ExternalAPI
    } 
}


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

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