public void ChangeState(T newState)
{
if (m_StateLookup == null)
{
throw new Exception("States have not been configured, please call initialized before trying to set state");
}
if (!m_StateLookup.ContainsKey(newState))
{
throw new Exception("No state with the name " + newState + " can be found. Please make sure you are called the correct type the statemachine was initialized with");
}
StateMapping nextState = m_StateLookup[newState];
if (CurrentStateMap == nextState)
{
return;
}
CurrentStateMap?.ExitCall();
m_LastState = CurrentStateMap;
CurrentStateMap = nextState;
if (CurrentStateMap != null)
{
CurrentStateMap.EnterCall();
OnChanged((T)CurrentStateMap.State);
}
}
protected State()
{
//Define States
Array values = Enum.GetValues(typeof(T));
if (values.Length < 1)
{
throw new ArgumentException("Enum provided to create this state must have at least 1 visible definition");
}
m_StateLookup = new Dictionary <object, StateMapping>();
for (int i = 0; i < values.Length; i++)
{
StateMapping mapping = new StateMapping((Enum)values.GetValue(i));
m_StateLookup.Add(mapping.State, mapping);
}
//Reflect methods
MethodInfo[] methods = GetType().GetMethods(BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public |
BindingFlags.NonPublic);
//Bind methods to states
char[] separator = "_".ToCharArray();
for (int i = 0; i < methods.Length; i++)
{
if (methods[i].GetCustomAttributes(typeof(CompilerGeneratedAttribute), true).Length != 0)
{
continue;
}
string[] names = methods[i].Name.Split(separator);
//Ignore functions without an underscore
if (names.Length <= 1)
{
continue;
}
Enum key;
try {
key = (Enum)Enum.Parse(typeof(T), names[0]);
}
catch (ArgumentException) {
//Not an method as listed in the state enum
continue;
}
StateMapping targetState = m_StateLookup[key];
switch (names[1])
{
case "Enter":
targetState.EnterCall = CreateDelegate <Action>(methods[i], this);
break;
case "Exit":
targetState.ExitCall = CreateDelegate <Action>(methods[i], this);
break;
case "Update":
targetState.Update = CreateDelegate <Action <float> >(methods[i], this);
break;
}
}
//Create nil state mapping
CurrentStateMap = new StateMapping(null);
}