public void Push(
string newScreenId,
Action <GameObject> initView = null,
ViewTransition transition = null,
Action onCompete = null)
{
if (!isInitialized)
{
throw new Exception("ViewStack is not yet initialized.");
}
if (transitionIsInProgress)
{
// TODO: How to handle this?
// for now just return and prevent starting a new one whilst one is in progress
return;
}
var newView = CreateView(newScreenId);
if (initView != null)
{
initView(newView);
}
PerformTransition(
transition,
() => viewStack.Add(new ViewStackEntry(newScreenId, newView)),
onCompete);
}
public void Pop(ViewTransition transition = null, Action onComplete = null)
{
if (!isInitialized)
{
throw new Exception("ViewStack is not yet initialized. Listen for OnInitialized before you start navigating");
}
if (transitionIsInProgress)
{
// TODO: How to handle this?
// for now just return and prevent starting a new one whilst one is in progress
return;
}
var oldTopViewEntry = TopViewEntry;
PerformTransition(
transition,
() => viewStack.Remove(oldTopViewEntry),
() =>
{
DestroyView(oldTopViewEntry);
if (onComplete != null)
{
onComplete();
}
}
);
}
// TODO: add other operations like replace, pop-replace, reset etc...
private void PerformTransition(ViewTransition transition, Action manipulateState, Action onComplete = null)
{
transition = transition ?? DefaultTransition ?? Transitions.Instant;
var oldTopViewEntry = TopViewEntry;
manipulateState();
if (OnTransitionStarted != null)
{
OnTransitionStarted.Invoke(
oldTopViewEntry != null ? oldTopViewEntry.ViewID : null,
TopViewEntry != null ? TopViewEntry.ViewID : null
);
}
if (oldTopViewEntry != null)
{
// notify old view that transition has started
oldTopViewEntry.NotifyView <ITransitionStartedHandler>(
t => t.HandleTransitionStarted());
}
var oldView = oldTopViewEntry != null ? oldTopViewEntry.View : null;
transitionIsInProgress = true;
transition(oldView, TopViewEntry != null ? TopViewEntry.View : null, () =>
{
// notify the new view that transition has completed
if (TopViewEntry != null)
{
TopViewEntry.NotifyView <ITransitionCompleteHandler>(
t => t.HandleTransitionComplete());
}
if (OnTransitionComplete != null)
{
OnTransitionComplete(oldTopViewEntry == null ? null : oldTopViewEntry.ViewID, TopViewEntry.ViewID);
}
if (OnViewHidden != null && oldTopViewEntry != null)
{
OnViewHidden(oldTopViewEntry.ViewID, oldTopViewEntry.View);
}
if (OnViewShown != null)
{
OnViewShown(TopViewEntry.ViewID, TopViewEntry.View);
}
transitionIsInProgress = false;
if (onComplete != null)
{
onComplete();
}
});
}
//assumption: whole screen view
public void SendViewAway(Transform view)
{
var transition = new ViewTransition {
view = view,
startPosition = view.position,
finalPosition = new Vector3(Screen.width * 1.5f, Screen.height * 0.5f, 0)
};
StartCoroutine("MovingView", transition);
}
//assumption: whole screen view
public void BringInView(Transform view)
{
var transition = new ViewTransition {
view = view,
startPosition = new Vector3(Screen.width * 1.5f, Screen.height * 0.5f, 0),
finalPosition = new Vector3(Screen.width * 0.5f, Screen.height * 0.5f, 0)
};
//TODO: setup in hierarchy so it won't be obscured
StartCoroutine("MovingView", transition);
}
IEnumerator MovingView(ViewTransition details)
{
details.view.position = details.startPosition;
var transitionTime = 0.21f;
var transitionTimer = 0f;
while (transitionTimer < transitionTime)
{
transitionTimer += Time.deltaTime;
var advancement = transitionTimer / transitionTime;
details.view.position = Vector3.Lerp(details.startPosition, details.finalPosition, advancement);
yield return(null);
}
details.view.position = details.finalPosition;
}
public void AddTransition(T from, T to, Action action)
{
_transitions[from] = new ViewTransition {
To = to, Action = action
};
}
