/// <summary>
/// Gets the internal list of class handlers for the specified routed event.
/// </summary>
/// <param name="classType">The type of the class for which to retrieve class handlers.</param>
/// <param name="routedEvent">A <see cref="RoutedEvent"/> which identifies the event for which to retrieve class handlers.</param>
/// <returns>The internal list of handlers for the specified routed event.</returns>
internal static List<RoutedEventHandlerMetadata> GetClassHandlers(Type classType, RoutedEvent routedEvent)
{
Contract.Require(classType, "classType");
Contract.Require(routedEvent, "routedEvent");
var manager = GetClassHandlerManager(routedEvent, classType, false);
if (manager == null)
{
while (true)
{
classType = classType.BaseType;
if (classType == null)
break;
manager = GetClassHandlerManager(routedEvent, classType, false);
if (manager != null)
{
return manager.GetClassHandlers();
}
}
return null;
}
return manager.GetClassHandlers();
}
/// <summary>
/// Initializes a new instance of the <see cref="RoutedEventClassHandlerManager"/> class.
/// </summary>
/// <param name="routedEvent">The routed event with which the registry is associated.</param>
/// <param name="ownerType">The type with which this registry is associated.</param>
public RoutedEventClassHandlerManager(RoutedEvent routedEvent, Type ownerType)
{
Contract.Require(routedEvent, nameof(routedEvent));
Contract.Require(ownerType, nameof(ownerType));
this.routedEvent = routedEvent;
this.ownerType = ownerType;
}
/// <summary>
/// Initializes a new instance of the <see cref="RoutedEventClassHandlerManager"/> class.
/// </summary>
/// <param name="routedEvent">The routed event with which the registry is associated.</param>
/// <param name="ownerType">The type with which this registry is associated.</param>
public RoutedEventClassHandlerManager(RoutedEvent routedEvent, Type ownerType)
{
Contract.Require(routedEvent, "routedEvent");
Contract.Require(ownerType, "type");
this.routedEvent = routedEvent;
this.ownerType = ownerType;
}
/// <summary>
/// Removes a routed event handler from the specified element.
/// </summary>
public static void RemoveHandler(DependencyObject dobj, RoutedEvent routedEvent, Delegate handler)
{
var element = dobj as UIElement;
if (element == null)
throw new ArgumentNullException(PresentationStrings.NotUIElement);
element.RemoveHandler(routedEvent, handler);
}
/// <summary>
/// Unregisters the specified subscriber from receiving routed event notifications for the specified routed event.
/// </summary>
/// <param name="dobj">The dependency object to monitor for changes.</param>
/// <param name="routedEvent">The routed event </param>
/// <param name="subscriber">The subscriber that wishes to stop receiving change notifications for the specified dependency property.</param>
internal static void UnregisterRaisedNotification(DependencyObject dobj, RoutedEvent routedEvent, IRoutedEventRaisedNotificationSubscriber subscriber)
{
Contract.Require(dobj, "dobj");
Contract.Require(routedEvent, "routedEvent");
Contract.Require(subscriber, "subscriber");
routedEvent.raisedNotificationServer.Unsubscribe(dobj, subscriber);
}
/// <summary>
/// Gets the list of registered event handlers for the specified event.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> value which identifies the event from which to retrieve a handler list.</param>
/// <returns>The manager's internal list of handlers for the specified event.</returns>
internal List<RoutedEventHandlerMetadata> GetHandlers(RoutedEvent evt)
{
List<RoutedEventHandlerMetadata> handlers;
lock (routedEventDelegates)
{
routedEventDelegates.TryGetValue(evt.ID, out handlers);
}
return handlers;
}
/// <summary>
/// Registers a new routed event.
/// </summary>
/// <param name="name">The routed event's name.</param>
/// <param name="uvssName">The routed event's name within the UVSS styling system.</param>
/// <param name="routingStrategy">The routed event's routing strategy.</param>
/// <param name="delegateType">The routed event's delegate type.</param>
/// <param name="ownerType">The routed event's owner type.</param>
/// <returns>A <see cref="RoutedEvent"/> instance which represents the registered routed event.</returns>
public static RoutedEvent Register(String name, String uvssName, RoutingStrategy routingStrategy, Type delegateType, Type ownerType)
{
Contract.Require(name, "name");
Contract.Require(delegateType, "delegateType");
Contract.Require(ownerType, "ownerType");
var evt = new RoutedEvent(reid++, name, uvssName, routingStrategy, delegateType, ownerType);
RegisterInternal(evt, ownerType);
return evt;
}
/// <summary>
/// Registers a class handler for a routed event.
/// </summary>
/// <param name="classType">The type of the class that is declaring class handling.</param>
/// <param name="routedEvent">A <see cref="RoutedEvent"/> which identifies the event to handle.</param>
/// <param name="handler">The delegate that represents the class handler to register.</param>
/// <param name="handledEventsToo">A value indicating whether to invoke the handler even if it has already been handled.</param>
public static void RegisterClassHandler(Type classType, RoutedEvent routedEvent, Delegate handler, Boolean handledEventsToo)
{
Contract.Require(classType, "classType");
Contract.Require(routedEvent, "routedEvent");
Contract.Require(handler, "handler");
var manager = GetClassHandlerManager(routedEvent, classType);
manager.AddHandler(handler, handledEventsToo);
Dictionary<Type, RoutedEventClassHandlerManager> otherManagers;
if (managers.TryGetValue(routedEvent, out otherManagers))
{
foreach (var kvp in otherManagers)
{
if (kvp.Key.IsSubclassOf(classType))
{
kvp.Value.AddHandler(classType, handler, handledEventsToo);
}
}
}
}
/// <summary>
/// Creates an invocation delegate for the specified routed event.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> which identifies the routed event for which to create an invocation delegate.</param>
/// <returns>The invocation delegate for the specified routed event.</returns>
public static Delegate CreateInvocationDelegate(RoutedEvent evt)
{
Contract.Require(evt, nameof(evt));
if (!IsValidRoutedEventDelegate(evt.DelegateType))
throw new InvalidOperationException(PresentationStrings.InvalidRoutedEventDelegate.Format(evt.DelegateType.Name));
switch (evt.RoutingStrategy)
{
case RoutingStrategy.Bubble:
return CreateInvocationDelegateForBubbleStrategy(evt);
case RoutingStrategy.Direct:
return CreateInvocationDelegateForDirectStrategy(evt);
case RoutingStrategy.Tunnel:
return CreateInvocationDelegateForTunnelStrategy(evt);
default:
throw new InvalidOperationException(PresentationStrings.InvalidRoutingStrategy);
}
}
/// <summary>
/// Removes a handler from the specified routed event.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> value which identifies the event from which to remove a handler.</param>
/// <param name="handler">A delegate which represents the handler to remove from the specified routed event.</param>
public void Remove(RoutedEvent evt, Delegate handler)
{
Contract.Require(evt, nameof(evt));
Contract.Require(handler, nameof(handler));
lock (routedEventDelegates)
{
List<RoutedEventHandlerMetadata> events;
if (!routedEventDelegates.TryGetValue(evt.ID, out events))
return;
lock (events)
{
for (int i = 0; i < events.Count; i++)
{
if (events[i].Handler == handler)
{
events.RemoveAt(i);
return;
}
}
}
}
}
/// <summary>
/// Adds a handler to the specified routed event.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> value which identifies the event to which to add a handler.</param>
/// <param name="handler">A delegate which represents the handler to add to the specified routed event.</param>
/// <param name="handledEventsToo">A value indicating whether the handler should receive events which have already been handled by other handlers.</param>
public void Add(RoutedEvent evt, Delegate handler, Boolean handledEventsToo)
{
Contract.Require(evt, nameof(evt));
Contract.Require(handler, nameof(handler));
if (evt.DelegateType != handler.GetType())
throw new ArgumentException(PresentationStrings.HandlerTypeMismatch.Format(handler.GetType().Name, evt.DelegateType.Name), "handler");
lock (routedEventDelegates)
{
List<RoutedEventHandlerMetadata> events;
if (!routedEventDelegates.TryGetValue(evt.ID, out events))
{
events = new List<RoutedEventHandlerMetadata>();
routedEventDelegates[evt.ID] = events;
}
var routedEventInfo = new RoutedEventHandlerMetadata(handler, 0, 0, handledEventsToo);
lock (events)
{
events.Add(routedEventInfo);
}
}
}
/// <summary>
/// Registers a class handler for a routed event.
/// </summary>
/// <param name="classType">The type of the class that is declaring class handling.</param>
/// <param name="routedEvent">A <see cref="RoutedEvent"/> which identifies the event to handle.</param>
/// <param name="handler">The delegate that represents the class handler to register.</param>
public static void RegisterClassHandler(Type classType, RoutedEvent routedEvent, Delegate handler)
{
RegisterClassHandler(classType, routedEvent, handler, false);
}
/// <summary>
/// Creates a new <see cref="RoutedEventClassHandlerManager"/> for the specified event and type,
/// populating the manager with relevant handlers from existing types that have already been registered.
/// </summary>
/// <param name="routedEvent">The event for which to create a class handler manager.</param>
/// <param name="classType">The type for which to create a class handler manager.</param>
/// <returns>The <see cref="RoutedEventClassHandlerManager"/> that was created for the specified event and type.</returns>
private static RoutedEventClassHandlerManager CreateClassHandlerManager(RoutedEvent routedEvent, Type classType)
{
var manager = new RoutedEventClassHandlerManager(routedEvent, classType);
Dictionary<Type, RoutedEventClassHandlerManager> existing;
if (managers.TryGetValue(routedEvent, out existing))
{
manager.SuspendSort();
foreach (var kvp in existing)
{
if (classType.IsSubclassOf(kvp.Key))
{
var handlers = kvp.Value.GetClassHandlers();
if (handlers == null)
continue;
lock (handlers)
{
foreach (var handler in handlers)
{
manager.AddHandler(kvp.Key, handler.Handler, handler.HandledEventsToo);
}
}
}
}
manager.ResumeSort();
}
return manager;
}
/// <summary>
/// Gets the next event handler to invoke for the current element.
/// </summary>
/// <param name="element">The element for which event handlers are being invoked.</param>
/// <param name="evt">A <see cref="RoutedEvent"/> which identifies the routed event for which handlers are being invoked.</param>
/// <param name="index">The index of the handler to invoke; this value is incremented by one when this method returns.</param>
/// <param name="handler">The metadata for the handler that corresponds to the specified index within the handler list.</param>
/// <returns><see langword="true"/> if a handler was retrieved for the specified index; otherwise, <see langword="false"/>.</returns>
private static Boolean GetEventHandler(DependencyObject element, RoutedEvent evt, ref Int32 index, ref RoutedEventHandlerMetadata handler)
{
var indexTemp = index;
var classHandlers = RoutedEventClassHandlers.GetClassHandlers(element.GetType(), evt);
if (classHandlers != null)
{
lock (classHandlers)
{
if (indexTemp >= 0 && indexTemp < classHandlers.Count)
{
handler = classHandlers[indexTemp];
index++;
return true;
}
indexTemp -= classHandlers.Count;
}
}
var uiElement = element as UIElement;
if (uiElement != null)
{
var instanceHandlers = uiElement.GetHandlers(evt);
if (instanceHandlers == null)
return false;
lock (instanceHandlers)
{
if (indexTemp >= instanceHandlers.Count)
{
return false;
}
handler = instanceHandlers[indexTemp];
index++;
}
return true;
}
else
{
return false;
}
}
/// <summary>
/// Adds a new owning type to the specified routed event.
/// </summary>
/// <param name="routedEvent">The routed event to which to add an owner type.</param>
/// <param name="ownerType">The owner type to add to the specified routed event.</param>
internal static RoutedEvent AddOwner(RoutedEvent routedEvent, Type ownerType)
{
Contract.Require(routedEvent, nameof(routedEvent));
Contract.Require(ownerType, nameof(ownerType));
RegisterInternal(routedEvent, ownerType);
return routedEvent;
}
/// <summary>
/// Creates an invocation delegate for a routed event which uses the <see cref="RoutingStrategy.Direct"/> routing strategy.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> which identifies the routed event for which to create an invocation delegate.</param>
/// <returns>The invocation delegate for the specified routed event.</returns>
private static Delegate CreateInvocationDelegateForDirectStrategy(RoutedEvent evt)
{
/* DIRECT STRATEGY
* The simplest strategy; the event is only invoked on the element that raised it.
* Our invocation delegate looks something like this:
*
* void fn(DependencyObject element, p1, p2, ..., pN, RoutedEventData data)
* {
* var index = 0;
* var handler = default(RoutedEventHandlerMetadata);
*
* while (GetEventHandler(element, RoutedEventID, ref index, ref handler))
* {
* if (ShouldEventBeRaisedForElement(data, handler.HandledEventsToo))
* {
* handler.Handler(element, p1, p2, ..., pN, data);
* }
* }
*
* RoutedEventID.RaiseRaisedNotification(element, data);
*
* if (data.AutoRelease)
* data.Release();
* }
*/
#if CODE_GEN_ENABLED
var evtInvoke = evt.DelegateType.GetMethod("Invoke");
var evtParams = evtInvoke.GetParameters().ToArray();
var expParams = evtParams.Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToList();
var expParamElement = expParams.First();
var expParamData = expParams.Last();
var expParts = new List<Expression>();
var expVars = new List<ParameterExpression>();
var varIndex = Expression.Variable(typeof(Int32), "index");
expVars.Add(varIndex);
var varHandler = Expression.Variable(typeof(RoutedEventHandlerMetadata), "handlers");
expVars.Add(varHandler);
var expInvokeBreak = Expression.Label();
var expInvoke = Expression.Loop(
Expression.IfThenElse(
Expression.Call(miGetEventHandler, expParamElement, Expression.Constant(evt), varIndex, varHandler),
Expression.IfThen(
Expression.Call(miShouldEventBeRaisedForElement, expParamData, Expression.Property(varHandler, "HandledEventsToo")),
Expression.Invoke(Expression.Convert(Expression.Property(varHandler, "Handler"), evt.DelegateType), expParams)
),
Expression.Break(expInvokeBreak)
),
expInvokeBreak
);
expParts.Add(expInvoke);
var expRaiseRaised = Expression.Call(Expression.Constant(evt), miRaiseRaisedNotification, expParamElement, expParamData);
expParts.Add(expRaiseRaised);
expParts.Add(Expression.IfThen(Expression.IsTrue(Expression.Property(expParamData, nameof(RoutedEventData.AutoRelease))),
Expression.Call(expParamData, nameof(RoutedEventData.Release), null)));
return Expression.Lambda(evt.DelegateType, Expression.Block(expVars, expParts), expParams).Compile();
#else
return CreateDelegateForReflectionBasedImplementation(evt, nameof(ReflectionBasedImplementationForDirectStrategy));
#endif
}
/// <summary>
/// Creates an invocation delegate for a routed event which uses the <see cref="RoutingStrategy.Bubble"/> routing strategy.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> which identifies the routed event for which to create an invocation delegate.</param>
/// <returns>The invocation delegate for the specified routed event.</returns>
private static Delegate CreateInvocationDelegateForBubbleStrategy(RoutedEvent evt)
{
/* BUBBLE STRATEGY
* For a given event delegate type TDelegate, we're constructing a method which basically looks like this:
*
* void fn(DependencyObject element, p1, p2, ..., pN, RoutedEventData data)
* {
* var index = 0;
* var handler = default(RoutedEventHandlerMetadata);
* var current = element;
*
* while (ShouldContinueBubbling(element, ref current))
* {
* index = 0;
* while (GetEventHandler(current, RoutedEventID, ref index, ref handler))
* {
* if (ShouldEventBeRaisedForElement(data, handler.HandledEventsToo))
* {
* handler.Handler(current, p1, p2, ..., pN, data);
* }
* }
*
* RoutedEventID.RaiseRaisedNotification(current, data);
* }
*
* if (data.AutoRelease)
* data.Release();
* }
*/
#if CODE_GEN_ENABLED
var evtInvoke = evt.DelegateType.GetMethod("Invoke");
var evtParams = evtInvoke.GetParameters().ToArray();
var expParams = evtParams.Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToList();
var expParamElement = expParams.First();
var expParamData = expParams.Last();
var expParts = new List<Expression>();
var expVars = new List<ParameterExpression>();
var varIndex = Expression.Variable(typeof(Int32), "index");
expVars.Add(varIndex);
var varHandler = Expression.Variable(typeof(RoutedEventHandlerMetadata), "handlers");
expVars.Add(varHandler);
var varCurrent = Expression.Variable(typeof(DependencyObject), "current");
expVars.Add(varCurrent);
var innerEventHandlerParams = new List<ParameterExpression>();
innerEventHandlerParams.Add(varCurrent);
innerEventHandlerParams.AddRange(expParams.Skip(1));
var expWhileBubbleBreakOuter = Expression.Label();
var expWhileBubbleBreakInner = Expression.Label();
var expWhileBubble = Expression.Loop(
Expression.IfThenElse(
Expression.Call(miShouldContinueBubbling, expParamElement, varCurrent),
Expression.Block(
Expression.Assign(varIndex, Expression.Constant(0)),
Expression.Loop(
Expression.IfThenElse(
Expression.Call(miGetEventHandler, varCurrent, Expression.Constant(evt), varIndex, varHandler),
Expression.IfThen(
Expression.Call(miShouldEventBeRaisedForElement, expParamData, Expression.Property(varHandler, "HandledEventsToo")),
Expression.Invoke(Expression.Convert(Expression.Property(varHandler, "Handler"), evt.DelegateType), innerEventHandlerParams)
),
Expression.Break(expWhileBubbleBreakInner)
),
expWhileBubbleBreakInner
),
Expression.Call(Expression.Constant(evt), miRaiseRaisedNotification, varCurrent, expParamData)
),
Expression.Break(expWhileBubbleBreakOuter)
),
expWhileBubbleBreakOuter
);
expParts.Add(expWhileBubble);
expParts.Add(Expression.IfThen(Expression.IsTrue(Expression.Property(expParamData, nameof(RoutedEventData.AutoRelease))),
Expression.Call(expParamData, nameof(RoutedEventData.Release), null)));
return Expression.Lambda(evt.DelegateType, Expression.Block(expVars, expParts), expParams).Compile();
#else
return CreateDelegateForReflectionBasedImplementation(evt, nameof(ReflectionBasedImplementationForBubbleStrategy));
#endif
}
/// <summary>
/// An implementation of the tunnel routing strategy which uses reflection rather than
/// dynamic runtime code generation.
/// </summary>
private static void ReflectionBasedImplementationForTunnelStrategy(RoutedEvent evt, Object[] parameters)
{
var index = 0;
var handler = default(RoutedEventHandlerMetadata);
var element = (DependencyObject)parameters[0];
var current = default(DependencyObject);
var data = (RoutedEventData)parameters[parameters.Length - 1];
while (ShouldContinueTunnelling(element, ref current))
{
index = 0;
while (GetEventHandler(current, evt, ref index, ref handler))
{
if (ShouldEventBeRaisedForElement(data, handler.HandledEventsToo))
{
parameters[0] = current;
handler.Handler.DynamicInvoke(parameters);
}
}
evt.RaiseRaisedNotification(current, data);
}
if (data.AutoRelease)
data.Release();
}
/// <summary>
/// Creates a delegate which wraps a reflection-based routing implementation.
/// </summary>
private static Delegate CreateDelegateForReflectionBasedImplementation(RoutedEvent evt, String method)
{
var evtInvoke = evt.DelegateType.GetMethod("Invoke");
var evtParams = evtInvoke.GetParameters().ToArray();
var implMethod = typeof(RoutedEventInvocation).GetMethod(method, BindingFlags.NonPublic | BindingFlags.Static);
var expParams = evtParams.Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToList();
var expImplParameters = expParams.Select(x => Expression.Convert(x, typeof(Object)));
var expImplMethodCall = Expression.Call(implMethod, Expression.Constant(evt),
Expression.NewArrayInit(typeof(Object), expImplParameters));
return Expression.Lambda(evt.DelegateType, expImplMethodCall, expParams).Compile();
}
/// <summary>
/// Registers the specified subscriber to receive routed event notifications for the specified routed event.
/// </summary>
/// <param name="dobj">The dependency object to monitor for changes.</param>
/// <param name="routedEvent">The dependency property for which to receive change notifications.</param>
/// <param name="subscriber">The subscriber that wishes to receive change notifications for the specified dependency property.</param>
internal static void RegisterRaisedNotification(DependencyObject dobj, RoutedEvent routedEvent, IRoutedEventRaisedNotificationSubscriber subscriber)
{
Contract.Require(dobj, nameof(dobj));
Contract.Require(routedEvent, nameof(routedEvent));
Contract.Require(subscriber, nameof(subscriber));
routedEvent.raisedNotificationServer.Subscribe(dobj, subscriber);
}
/// <summary>
/// Adds a new owning type to the specified routed event.
/// </summary>
/// <param name="routedEvent">The routed event to which to add an owner type.</param>
/// <param name="ownerType">The owner type to add to the specified routed event.</param>
internal static RoutedEvent AddOwner(RoutedEvent routedEvent, Type ownerType)
{
Contract.Require(routedEvent, "routedEvent");
Contract.Require(ownerType, "ownerType");
RegisterInternal(routedEvent, ownerType);
return routedEvent;
}
/// <summary>
/// Gets the <see cref="RoutedEventClassHandlerManager"/> for the specified event and type.
/// </summary>
/// <param name="routedEvent">The event for which to retrieve a class handler manager.</param>
/// <param name="classType">The type for which to retrieve a class handler manager.</param>
/// <param name="createIfMissing">A value specifying whether the manager should be created if it does not already exist.</param>
/// <returns>The <see cref="RoutedEventClassHandlerManager"/> for the specified event and type.</returns>
private static RoutedEventClassHandlerManager GetClassHandlerManager(RoutedEvent routedEvent, Type classType, Boolean createIfMissing = true)
{
Dictionary<Type, RoutedEventClassHandlerManager> managersByType;
if (!managers.TryGetValue(routedEvent, out managersByType))
{
if (!createIfMissing)
return null;
managersByType = new Dictionary<Type, RoutedEventClassHandlerManager>();
managers[routedEvent] = managersByType;
}
RoutedEventClassHandlerManager manager;
if (!managersByType.TryGetValue(classType, out manager))
{
if (!createIfMissing)
return null;
manager = CreateClassHandlerManager(routedEvent, classType);
managersByType[classType] = manager;
}
return manager;
}
/// <summary>
/// Initializes a new instance of the <see cref="RoutedEventRaisedNotificationServer"/> class.
/// </summary>
/// <param name="routedEvent">The routed event that this notification server represents.</param>
public RoutedEventRaisedNotificationServer(RoutedEvent routedEvent)
{
Contract.Require(routedEvent, nameof(routedEvent));
this.routedEvent = routedEvent;
}
/// <summary>
/// Registers the specified routed event.
/// </summary>
/// <param name="evt">The routed event to register.</param>
/// <param name="ownerType">The owner type for which to register the routed event.</param>
private static void RegisterInternal(RoutedEvent evt, Type ownerType)
{
var propertyDomain = GetEventDomain(ownerType);
if (propertyDomain.ContainsKey(evt.Name))
throw new ArgumentException(PresentationStrings.RoutedEventAlreadyRegistered);
propertyDomain[evt.Name] = evt;
var stylingPropertyDomain = GetStylingEventDomain(ownerType);
if (stylingPropertyDomain.ContainsKey(evt.UvssName))
throw new ArgumentException(PresentationStrings.RoutedEventAlreadyRegistered);
stylingPropertyDomain[evt.UvssName] = evt;
}
/// <summary>
/// Creates an invocation delegate for a routed event which uses the <see cref="RoutingStrategy.Tunnel"/> routing strategy.
/// </summary>
/// <param name="evt">A <see cref="RoutedEvent"/> which identifies the routed event for which to create an invocation delegate.</param>
/// <returns>The invocation delegate for the specified routed event.</returns>
private static Delegate CreateInvocationDelegateForTunnelStrategy(RoutedEvent evt)
{
/* TUNNEL STRATEGY
* Basically the opposite of the bubble strategy; we start at the root of the tree and work down.
* Note that ShouldContinueTunnelling() builds a stack representing the path to take on the first call.
*
* void fn(DependencyObject element, p1, p2, ..., pN, RoutedEventData data)
* {
* var index = 0;
* var current = default(DependencyObject);
* var handlers = default(List<RoutedEventHandlerMetadata>);
*
* while (ShouldContinueTunnelling(element, ref current))
* {
* index = 0;
* while (GetEventHandler(current, RoutedEventID, index, out handler))
* {
* if (ShouldEventBeRaisedForElement(data, handler.HandledEventsToo))
* {
* handler.Handler(current, p1, p2, ..., pN, data);
* }
* }
*
* RoutedEventID.RaiseRaisedNotification(current, data);
* }
*
* if (data.AutoRelease)
* data.Release();
* }
*/
#if CODE_GEN_ENABLED
var evtInvoke = evt.DelegateType.GetMethod("Invoke");
var evtParams = evtInvoke.GetParameters().ToArray();
var expParams = evtParams.Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToList();
var expParamElement = expParams.First();
var expParamData = expParams.Last();
var expParts = new List<Expression>();
var expVars = new List<ParameterExpression>();
var varIndex = Expression.Variable(typeof(Int32), "index");
expVars.Add(varIndex);
var varHandler = Expression.Variable(typeof(RoutedEventHandlerMetadata), "handler");
expVars.Add(varHandler);
var varCurrent = Expression.Variable(typeof(DependencyObject), "current");
expVars.Add(varCurrent);
var innerEventHandlerParams = new List<ParameterExpression>();
innerEventHandlerParams.Add(varCurrent);
innerEventHandlerParams.AddRange(expParams.Skip(1));
var expWhileTunnelBreakOuter = Expression.Label();
var expWhileTunnelBreakInner = Expression.Label();
var expWhileTunnel = Expression.Loop(
Expression.IfThenElse(
Expression.Call(miShouldContinueTunnelling, expParamElement, varCurrent),
Expression.Block(
Expression.Assign(varIndex, Expression.Constant(0)),
Expression.Loop(
Expression.IfThenElse(
Expression.Call(miGetEventHandler, varCurrent, Expression.Constant(evt), varIndex, varHandler),
Expression.IfThen(
Expression.Call(miShouldEventBeRaisedForElement, expParamData, Expression.Property(varHandler, "HandledEventsToo")),
Expression.Invoke(Expression.Convert(Expression.Property(varHandler, "Handler"), evt.DelegateType), innerEventHandlerParams)
),
Expression.Break(expWhileTunnelBreakInner)
),
expWhileTunnelBreakInner
),
Expression.Call(Expression.Constant(evt), miRaiseRaisedNotification, varCurrent, expParamData)
),
Expression.Break(expWhileTunnelBreakOuter)
),
expWhileTunnelBreakOuter
);
expParts.Add(expWhileTunnel);
expParts.Add(Expression.IfThen(Expression.IsTrue(Expression.Property(expParamData, nameof(RoutedEventData.AutoRelease))),
Expression.Call(expParamData, nameof(RoutedEventData.Release), null)));
return Expression.Lambda(evt.DelegateType, Expression.Block(expVars, expParts), expParams).Compile();
#else
return CreateDelegateForReflectionBasedImplementation(evt, nameof(ReflectionBasedImplementationForTunnelStrategy));
#endif
}
