public virtual void PopState()
{
if (states.Count > 0)
{
T current = states[states.Count - 1];
T next = default(T);
if (states.Count > 1)
{
next = states[states.Count - 2];
next.State = ScreenState.Active;
}
leaveTransition = current.LeaveTransition;
if (leaveTransition != null)
{
leaveTransition.Init(current, next);
}
else
{
leaveTransition = new EmptyTransition();
}
current.IsExiting = true;
current.State = ScreenState.TransitionOff; // ollaan häivyttämässä
this.current = current;
this.next = next;
current.HasFocus = false;
// viiminen ruutu
if (next != null)
{
next.HasFocus = false;
}
}
}
public virtual void ChangeState(T state)
{
if (states.Count != 0)
{
current = states[states.Count - 1];
next = state;
leaveTransition = current.LeaveTransition;
if (leaveTransition == null)
{
leaveTransition = new EmptyTransition();
}
leaveTransition.Init(current, next);
current.IsExiting = true;
}
current.State = ScreenState.TransitionOff; // ollaan häivyttämässä
current.HasFocus = false;
next.HasFocus = false;
states.Add(state);
InitState(state);
}
public virtual void PushState(T state)
{
if (states.Count != 0)
{
leaveTransition = (state.IsPopUp) ? null : states[states.Count - 1].LeaveTransition;
if (leaveTransition != null)
{
leaveTransition.Init(states[states.Count - 1], state);
}
else
{
leaveTransition = new EmptyTransition();
}
current = states[states.Count - 1];
current.State = ScreenState.TransitionOff; // häivytetään
}
next = state;
next.HasFocus = false;
current.HasFocus = false;
states.Add(state);
InitState(state);
}
public virtual void Update(GameTime time)
{
// jos nykyisellä ruudulla on lopetus siirtymä
if (leaveTransition != null)
{
if (!leaveTransition.IsStarted)
{
leaveTransition.Start();
}
leaveTransition.Update(time);
// jos siirtymä on valmis niin vaihdetaan ruutu seuraavaan
// ja aletaan suorittamaan aloitus siirtymää
if (leaveTransition.IsFinished)
{
leaveTransition = null;
// jos on viiminen ruutu, niin nextiä ei sillon ole
if (next != null)
{
if (next.IsPopUp)
{
current.State = ScreenState.Background;
}
else
{
current.State = ScreenState.Hidden; // ei ole enää näkyvissä
}
// vaihdetaan ruutujen paikat
T prev = current;
current = next;
// tyhjennetään nykyisen ruudun viite
next = default(T);
current.State = ScreenState.TransitionOn; // ollaan häivyttämässä kuvaa sisään
if (prev.IsPopUp)
{
enterTransition = new EmptyTransition();
}
else
{
enterTransition = current.EnterTransition;
}
if (enterTransition == null)
{
enterTransition = new EmptyTransition();
}
enterTransition.Init(current, prev);
}
}
}
for (int i = states.Count - 1; i >= 0; i--)
{
T state = states[i];
state.Update(time);
}
if (enterTransition != null)
{
if (!enterTransition.IsStarted)
{
enterTransition.Start();
}
enterTransition.Update(time);
if (enterTransition.IsFinished)
{
enterTransition = null;
current.State = ScreenState.Active; // nyt ollaan näkyvissä
current.HasFocus = true;
for (int i = states.Count - 1; i >= 0; i--)
{
T state = states[i];
if (state.IsExiting)
{
Remove(state);
}
}
}
}
}