/// <summary>
/// You register a transition with the manager here. This will start to run
/// the transition as the manager's timer ticks.
/// </summary>
public void register(Transition transition)
{
lock (m_Lock)
{
// We check to see if the properties of this transition
// are already being animated by any existing transitions...
removeDuplicates(transition);
// We add the transition to the collection we manage, and
// observe it so that we know when it has completed...
m_Transitions[transition] = true;
transition.TransitionCompletedEvent += onTransitionCompleted;
}
}
/// <summary>
/// Finds any properties in the old-transition that are also in the new one,
/// and removes them from the old one.
/// </summary>
private void removeDuplicates(Transition newTransition, Transition oldTransition)
{
// Note: This checking might be a bit more efficient if it did the checking
// with a set rather than looking through lists. That said, it is only done
// when transitions are added (which isn't very often) rather than on the
// timer, so I don't think this matters too much.
// We get the list of properties for the old and new transitions...
IList<Transition.TransitionedPropertyInfo> newProperties = newTransition.TransitionedProperties;
IList<Transition.TransitionedPropertyInfo> oldProperties = oldTransition.TransitionedProperties;
// We loop through the old properties backwards (as we may be removing
// items from the list if we find a match)...
for (int i = oldProperties.Count - 1; i >= 0; i--)
{
// We get one of the properties from the old transition...
Transition.TransitionedPropertyInfo oldProperty = oldProperties[i];
// Is this property part of the new transition?
foreach (Transition.TransitionedPropertyInfo newProperty in newProperties)
{
if (oldProperty.target == newProperty.target
&&
oldProperty.propertyInfo == newProperty.propertyInfo)
{
// The old transition contains the same property as the new one,
// so we remove it from the old transition...
oldTransition.removeProperty(oldProperty);
}
}
}
}
/// <summary>
/// Called when a transition has completed.
/// </summary>
private void onTransitionCompleted(object sender, Transition.Args e)
{
// We stop observing the transition...
Transition transition = (Transition)sender;
transition.TransitionCompletedEvent -= onTransitionCompleted;
// We remove the transition from the collection we're managing...
lock (m_Lock)
{
m_Transitions.Remove(transition);
}
}
/// <summary>
/// Checks if any existing transitions are acting on the same properties as the
/// transition passed in. If so, we remove the duplicated properties from the
/// older transitions.
/// </summary>
private void removeDuplicates(Transition transition)
{
// We look through the set of transitions we're currently managing...
foreach (KeyValuePair<Transition, bool> pair in m_Transitions)
{
removeDuplicates(transition, pair.Key);
}
}
/// <summary>
/// Creates and immediately runs a transition on the property passed in.
/// </summary>
public static void run(object target, string strPropertyName, object destinationValue, ITransitionType transitionMethod)
{
Transition t = new Transition(transitionMethod);
t.add(target, strPropertyName, destinationValue);
t.run();
}
