/// <summary>
/// Removes the <see cref="FrameworkElement"/> with the given <see cref="EventDefinition"/> from Tracking.
/// </summary>
/// <param name="element"></param>
/// <param name="event"></param>
private void RemoveEventHandler(FrameworkElement element, EventDefinition @event)
{
IEnumerable <KeyValuePair <FrameworkElementEvent, Delegate> > registerd = null;
if (@event.AssignRecursively || [email protected](element))
{
registerd = EventDelegates.Where(i => i.Key.Event.Equals(@event)).ToList();
}
else
{
var key = new FrameworkElementEvent(element, @event, Element);
registerd = EventDelegates.Where(i => i.Key.Equals(key)).ToList();
}
if (registerd.Count() > 0)
{
foreach (var item in registerd)
{
var info = @event.GetEventInfo(item.Key.Element.GetType());
info.RemoveEventHandler(item.Key.Element, item.Value);
EventDelegates.Remove(item.Key);
Config.Instance.WriteLog(this, $"Removed {item.Key?.Element?.ToString()} with EventType {item.Key?.Event?.EventType.ToString()} to Tracked Events of {Element?.ToString()}.", Enums.LogType.Info);
}
}
}
/// <summary>
/// Adds the EventDelegate to the event handler for the given Event. If the EventType is not Assignable to the given FrameworkElement,
/// it will Query through the Visual Tree and register this Event to the first FrameworkElement in each path where it fits.
/// Method is not running Synchronous, it will add the event handlers in the Loaded Event, when the given Framework Element is not actually part of the Visual tree.
/// </summary>
/// <param name="element"></param>
/// <param name="event"></param>
/// <param name="trackingElement"></param>
private void AddEventHandler(FrameworkElement element, EventDefinition @event, FrameworkElement trackingElement)
{
var key = new FrameworkElementEvent(element, @event, trackingElement);
//Check if Event is already Added
if (!EventDelegates.ContainsKey(key))
{
Action <object, EventArgs> loadedAction = (sender, e) =>
{
var children = element.GetChildren().Where(i => i is FrameworkElement).Cast <FrameworkElement>().ToList();
foreach (var child in children)
{
AddEventHandler(child, @event, trackingElement);
}
};
//Test if Event is assignable
if (@event.IsAssignable(element))
{
//Register Delegate
var @delegate = Delegate.CreateDelegate(
@event.Description.EventHandler,
key,
key.GetType()
.GetMethod("EventDelegate",
BindingFlags.NonPublic | BindingFlags.Instance));
RegisterDelegate(element, @delegate, @event);
EventDelegates.Add(key, @delegate);
Config.Instance.WriteLog(this, $"Adding {key?.Element?.ToString()} with EventType {key?.Event?.EventType.ToString()} to Tracked Events of {Element?.ToString()}.", Enums.LogType.Info);
if (@event.AssignRecursively)
{
var parent = VisualTreeHelper.GetParent(element);
var cCount = VisualTreeHelper.GetChildrenCount(element);
if (parent == null && cCount == default(int))
{
//Creating a delegate with Executes this after Loaded Event, because then is the Visual tree generated.
element.Loaded += (sender, e) => loadedAction(sender, e);
}
else
{
//Element is attached to Visual Tree so get the Children directly
loadedAction.Invoke(element, new RoutedEventArgs());
}
}
}
else
{
//If not assignable: Query the visual tree for Elements where the Event can be Assigned to
var parent = VisualTreeHelper.GetParent(element);
var cCount = VisualTreeHelper.GetChildrenCount(element);
if (parent == null && cCount == default(int))
{
//Creating a delegate with Executes this after Loaded Event, because then is the Visual tree generated.
element.Loaded += (sender, e) => loadedAction(sender, e);
}
else
{
//Element is attached to Visual Tree so get the Children directly
loadedAction.Invoke(element, new RoutedEventArgs());
}
}
}
}
