void RemovePage(Page page)
{
IVisualElementRenderer rendererToRemove = Platform.GetRenderer(page);
PageContainer containerToRemove = rendererToRemove == null ? null : (PageContainer)rendererToRemove.View.Parent;
containerToRemove.RemoveFromParent();
if (rendererToRemove != null)
{
rendererToRemove.View.RemoveFromParent();
rendererToRemove.Dispose();
}
containerToRemove?.Dispose();
UpdateActionBar();
}
public override Object InstantiateItem(ViewGroup container, int position)
{
ContentPage child = _page.Children.ElementAt(position);
if (Platform.GetRenderer(child) == null)
{
Platform.SetRenderer(child, Platform.CreateRenderer(child));
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
renderer.View.RemoveFromParent();
ViewGroup frame = new PageContainer(_context, renderer);
container.AddView(frame);
return(new ObjectJavaBox <Tuple <ViewGroup, Page, int> >(new Tuple <ViewGroup, Page, int>(frame, child, position)));
}
void RemovePage(Page page)
{
IVisualElementRenderer rendererToRemove = Platform.GetRenderer(page);
PageContainer containerToRemove = rendererToRemove == null ? null : (PageContainer)rendererToRemove.ViewGroup.Parent;
containerToRemove.RemoveFromParent();
if (rendererToRemove != null)
{
rendererToRemove.ViewGroup.RemoveFromParent();
rendererToRemove.Dispose();
}
containerToRemove?.Dispose();
Device.StartTimer(TimeSpan.FromMilliseconds(0), () =>
{
((Platform)Element.Platform).UpdateNavigationTitleBar();
return(false);
});
}
Task <bool> SwitchContentAsync(Page view, bool animated, bool removed = false)
{
Context.HideKeyboard(this);
IVisualElementRenderer rendererToAdd = Platform.GetRenderer(view);
bool existing = rendererToAdd != null;
if (!existing)
{
Platform.SetRenderer(view, rendererToAdd = Platform.CreateRenderer(view));
}
Page pageToRemove = _current;
IVisualElementRenderer rendererToRemove = pageToRemove == null ? null : Platform.GetRenderer(pageToRemove);
PageContainer containerToRemove = rendererToRemove == null ? null : (PageContainer)rendererToRemove.ViewGroup.Parent;
PageContainer containerToAdd = (PageContainer)rendererToAdd.ViewGroup.Parent ?? new PageContainer(Context, rendererToAdd);
containerToAdd.SetWindowBackground();
_current = view;
((Platform)Element.Platform).NavAnimationInProgress = true;
var tcs = new TaskCompletionSource <bool>();
if (animated)
{
if (s_currentAnimation != null)
{
s_currentAnimation.Cancel();
}
if (removed)
{
// animate out
if (containerToAdd.Parent != this)
{
AddView(containerToAdd, Element.LogicalChildren.IndexOf(rendererToAdd.Element));
}
else
{
((Page)rendererToAdd.Element).SendAppearing();
}
containerToAdd.Visibility = ViewStates.Visible;
if (containerToRemove != null)
{
Action <AndroidAnimation.Animator> done = a =>
{
containerToRemove.Visibility = ViewStates.Gone;
containerToRemove.Alpha = 1;
containerToRemove.ScaleX = 1;
containerToRemove.ScaleY = 1;
RemoveView(containerToRemove);
tcs.TrySetResult(true);
((Platform)Element.Platform).NavAnimationInProgress = false;
VisualElement removedElement = rendererToRemove.Element;
rendererToRemove.Dispose();
if (removedElement != null)
{
Platform.SetRenderer(removedElement, null);
}
};
// should always happen
s_currentAnimation = containerToRemove.Animate().Alpha(0).ScaleX(0.8f).ScaleY(0.8f).SetDuration(250).SetListener(new GenericAnimatorListener {
OnEnd = a =>
{
s_currentAnimation = null;
done(a);
},
OnCancel = done
});
}
}
else
{
bool containerAlreadyAdded = containerToAdd.Parent == this;
// animate in
if (!containerAlreadyAdded)
{
AddView(containerToAdd);
}
else
{
((Page)rendererToAdd.Element).SendAppearing();
}
if (existing)
{
Element.ForceLayout();
}
containerToAdd.Alpha = 0;
containerToAdd.ScaleX = containerToAdd.ScaleY = 0.8f;
containerToAdd.Visibility = ViewStates.Visible;
s_currentAnimation = containerToAdd.Animate().Alpha(1).ScaleX(1).ScaleY(1).SetDuration(250).SetListener(new GenericAnimatorListener {
OnEnd = a =>
{
if (containerToRemove != null && containerToRemove.Handle != IntPtr.Zero)
{
containerToRemove.Visibility = ViewStates.Gone;
if (pageToRemove != null)
{
pageToRemove.SendDisappearing();
}
}
s_currentAnimation = null;
tcs.TrySetResult(true);
((Platform)Element.Platform).NavAnimationInProgress = false;
}
});
}
}
else
{
// just do it fast
if (containerToRemove != null)
{
if (removed)
{
RemoveView(containerToRemove);
}
else
{
containerToRemove.Visibility = ViewStates.Gone;
}
}
if (containerToAdd.Parent != this)
{
AddView(containerToAdd);
}
else
{
((Page)rendererToAdd.Element).SendAppearing();
}
if (containerToRemove != null && !removed)
{
pageToRemove.SendDisappearing();
}
if (existing)
{
Element.ForceLayout();
}
containerToAdd.Visibility = ViewStates.Visible;
tcs.SetResult(true);
((Platform)Element.Platform).NavAnimationInProgress = false;
}
return(tcs.Task);
}
protected virtual void AddChildView(VisualElement childView)
{
_pageContainer = null;
Page page = childView as NavigationPage ?? (Page)(childView as TabbedPage);
if (page == null)
{
// The thing we're adding is not a NavigationPage or TabbedPage, so we can just use the old AddChildView
if (_currentFragment != null)
{
if (!_parent.IsAttachedToRoot())
{
return;
}
// But first, if the previous occupant of this container was a fragment, we need to remove it properly
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
transaction.RemoveEx(_currentFragment);
transaction.SetTransitionEx((int)FragmentTransit.None);
if (IsAttachedToWindow)
{
ExecuteTransaction(transaction);
}
else
{
_transaction = transaction;
}
_currentFragment = null;
}
IVisualElementRenderer renderer = APlatform.GetRenderer(childView);
if (renderer == null)
{
APlatform.SetRenderer(childView, renderer = APlatform.CreateRenderer(childView, Context));
}
if (renderer.View.Parent != this)
{
if (renderer.View.Parent != null)
{
renderer.View.RemoveFromParent();
}
SetDefaultBackgroundColor(renderer);
AddView(renderer.View);
renderer.UpdateLayout();
}
}
else
{
if (!_parent.IsAttachedToRoot())
{
return;
}
// The renderers for NavigationPage and TabbedPage both host fragments, so they need to be wrapped in a
// FragmentContainer in order to get isolated fragment management
Fragment fragment = FragmentContainer.CreateInstance(page);
var fc = fragment as FragmentContainer;
fc?.SetOnCreateCallback(pc =>
{
_pageContainer = pc;
UpdateFlowDirection();
SetDefaultBackgroundColor(pc.Child);
});
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
if (_currentFragment != null)
{
transaction.RemoveEx(_currentFragment);
}
transaction.AddEx(Id, fragment);
transaction.SetTransitionEx((int)FragmentTransit.None);
if (IsAttachedToWindow)
{
ExecuteTransaction(transaction);
}
else
{
_transaction = transaction;
}
_currentFragment = fragment;
}
}