public void ChangeCurrentActivity(ActivityModel newActivity, int nextIndex)
{
if (_activities.Count <= nextIndex)
{
_activities.Add(newActivity);
}
CurrentIndex = nextIndex;
BackStackChanged?.Invoke();
}
private Task <bool> NavigateWithMode(ActivityModel newActivity, NavigationMode navigationMode)
{
return(RunNavigationWithCheck(async() =>
{
var currentActivity = CurrentActivityModel;
_activityStackManager.ClearForwardStack();
await NavigateImplAsync(navigationMode, currentActivity, newActivity,
_activityStackManager.CurrentIndex + 1);
return true;
}));
}
private async Task UpdateContent(NavigationMode navigationMode, ActivityModel currentActivity,
ActivityModel nextActivity)
{
var animation = ActualActivityTransition;
var current = currentActivity?.GetActivity(this);
var next = nextActivity?.GetActivity(this);
if (animation != null)
{
AddActivityToContentRoot(navigationMode, animation.InsertionMode, next);
switch (navigationMode)
{
case NavigationMode.New:
await animation.OnStart(next, current);
break;
case NavigationMode.Back:
await animation.OnClose(current, next);
break;
default:
throw new ArgumentOutOfRangeException(nameof(navigationMode), navigationMode, null);
}
Children.Remove(current);
}
else
{
if (Children.Any())
{
Children[0] = next;
}
else
{
Children.Add(next);
}
}
}
private async Task NavigateImplAsync(NavigationMode navigationMode,
ActivityModel currentActivity, ActivityModel nextActivity, int nextIndex)
{
IsHitTestVisible = false;
InvokeLifecycleBeforeContentChanged(navigationMode, currentActivity, nextActivity);
_activityStackManager.ChangeCurrentActivity(nextActivity, nextIndex);
OnCurrentActivityChanged(currentActivity?.Activity, nextActivity?.Activity);
Navigating?.Invoke(this, EventArgs.Empty);
await UpdateContent(navigationMode, currentActivity, nextActivity);
InvokeLifecycleAfterContentChanged(navigationMode, currentActivity, nextActivity);
IsHitTestVisible = true;
ReleaseActivity(currentActivity);
Navigated?.Invoke(this, EventArgs.Empty);
}
public Task <bool> Navigate(Type activityType, object parameter)
{
var newActivity = new ActivityModel(activityType, parameter);
return(NavigateWithMode(newActivity, NavigationMode.New));
}
private void InvokeLifecycleAfterContentChanged(NavigationMode navigationMode, ActivityModel currentActivity,
ActivityModel nextActivity)
{
switch (navigationMode)
{
case NavigationMode.New:
currentActivity?.GetActivity(this)?.OnStop();
nextActivity?.GetActivity(this)?.OnResume();
break;
case NavigationMode.Back:
currentActivity?.GetActivity(this)?.OnDestroy();
nextActivity?.GetActivity(this).OnResume();
break;
case NavigationMode.Forward:
break;
case NavigationMode.Refresh:
break;
default:
throw new ArgumentOutOfRangeException(nameof(navigationMode), navigationMode, null);
}
}
