Exemplo n.º 1
0
        private static void AddActionToTrigger(DependencyObject target, TriggerAction message, TriggerBase trigger)
        {
            if (trigger is EventTrigger)
            {
                var eventTrigger = (EventTrigger)trigger;

                eventTrigger.Actions.Add(message);
            }

            trigger.EnterActions.Add(message);

            // TriggerAction doesn't have an associated object property so we have
            // to create it ourselves, could be potential issues here with leaking the associated
            // object and not correctly detaching, this may depend if the trigger implements it's
            // AssociatedObject as a DependencyProperty.

            var actionMessage = message as ActionMessage;
            var targetElement = target as FrameworkElement;

            if (actionMessage != null && targetElement != null)
            {
                actionMessage.AssociatedObject = targetElement;
            }
        }
Exemplo n.º 2
0
        private static void AddActionToTrigger(DependencyObject target, TriggerAction message, TriggerBase trigger)
        {
            // This is stupid, but there a number of limitiations in the 8.1 Behaviours SDK

            // The first is that there is no base class for a Trigger, just IBehaviour. Which
            // means there's no strongly typed way to add an action to a trigger. Every trigger
            // in the SDK implements the same pattern but no interface, we're going to have to
            // use reflection to set it.

            // More stupidity, ActionCollection doesn't care about IAction, but DependencyObject
            // and there's no actual implementation of

            var messageDependencyObject = message as DependencyObject;

            if (messageDependencyObject == null)
            {
                Log.Warn("{0} doesn't inherit DependencyObject and can't be added to ActionCollection", trigger.GetType().FullName);
                return;
            }

            // 95% of the time the trigger will be an EventTrigger, let's optimise for that case

            if (trigger is EventTrigger)
            {
                var eventTrigger = (EventTrigger)trigger;

                eventTrigger.Actions.Add(messageDependencyObject);
            }
            else
            {
                var actionsProperty = trigger.GetType().GetRuntimeProperty("Actions");

                if (actionsProperty == null)
                {
                    Log.Warn("Could not find Actions collection on trigger {0}.", trigger.GetType().FullName);
                    return;
                }

                var actionCollection = actionsProperty.GetValue(trigger) as ActionCollection;

                if (actionCollection == null)
                {
                    Log.Warn("{0}.Actions is either not an ActionCollection or is null.", trigger.GetType().FullName);
                    return;
                }

                actionCollection.Add(messageDependencyObject);
            }

            // The second is the IAction doesn't have an associated object property so we have
            // to create it ourselves, could be potential issues here with leaking the associated
            // object and not correctly detaching, this may depend if the trigger implements it's
            // AssociatedObject as a DependencyProperty.

            // Turns out trying to a binding won't work because the trigger doesn't notify the
            // binding of changes, so we just need to set it, yay.

            var actionMessage = message as ActionMessage;
            var targetElement = target as FrameworkElement;

            if (actionMessage != null && targetElement != null)
            {
                //var binding = new Binding { Source = trigger, Path = new PropertyPath("AssociatedObject") };

                //BindingOperations.SetBinding(actionMessage, ActionMessage.AssociatedObjectProperty, binding);

                actionMessage.AssociatedObject = targetElement;
            }
        }