public MyStatefulAnimatedSpriteState GetState(string stateName)
{
// Validate the input parameter
if (stateName == null || stateName.Length == 0)
{
throw new ArgumentException("Invalid state name");
}
// Try to find the state
MyStatefulAnimatedSpriteState ret = null;
States.TryGetValue(stateName, out ret);
// If not found, then throw an exception, informing the caller that the state name is wrong
if (ret == null)
{
throw new ArgumentException("Cannot find a state named [" + stateName + "]");
}
// If found, then return a reference
return(ret);
}
/**
* This works somewhat like a method of a builder class, to help chain up
* multiple state-adding operations.
*/
public MyStatefulAnimatedSprite WithState(string stateName, MyStatefulAnimatedSpriteState State)
{
// Make sure the parameters are ok, to avoid runtime errors
if (stateName == null)
{
throw new ArgumentException("Each state must have a name");
}
if (State == null)
{
throw new ArgumentException("The state may not be null");
}
// Add the state. Override any pre-existing state with the same name.
States.Add(stateName, State);
// If this is the first state added, then make it the current state.
if (CurrentState == null)
{
SetStateObject(State);
}
// Return a self reference to allow queuing the next WithState operation
return(this);
}
private void SetStateObject(MyStatefulAnimatedSpriteState State)
{
CurrentState = State;
isBackgroundTransparet = State.IsBackgroundTransparent();
}