protected override void OnElementChanged(ElementChangedEventArgs <AnimatedNavigationPage> e)
{
if (_navigationStack == null)
{
_navigationStack = new NavigationStack(XForms.NativeParent);
_navigationStack.Show();
_navigationStack.SetAlignment(-1, -1);
_navigationStack.SetWeight(1, 1);
_navigationStack.Show();
SetNativeView(_navigationStack);
}
if (e.OldElement != null)
{
var navigation = e.OldElement as INavigationPageController;
navigation.PopRequested -= OnPopRequested;
navigation.PopToRootRequested -= OnPopToRootRequested;
navigation.PushRequested -= OnPushRequested;
navigation.RemovePageRequested -= OnRemovePageRequested;
navigation.InsertPageBeforeRequested -= OnInsertPageBeforeRequested;
}
if (e.NewElement != null)
{
var navigation = e.NewElement as INavigationPageController;
navigation.PopRequested += OnPopRequested;
navigation.PopToRootRequested += OnPopToRootRequested;
navigation.PushRequested += OnPushRequested;
navigation.RemovePageRequested += OnRemovePageRequested;
navigation.InsertPageBeforeRequested += OnInsertPageBeforeRequested;
_previousPage = e.NewElement.CurrentPage;
_navigationStack.IsPreviousViewVisible = Element.IsPreviousPageVisible;
}
base.OnElementChanged(e);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_navigationStack != null)
{
_navigationStack.Unrealize();
_navigationStack = null;
}
}
base.Dispose(disposing);
}