public Task Transition(IShellItemRenderer oldRenderer, IShellItemRenderer newRenderer)
{
TaskCompletionSource <bool> task = new TaskCompletionSource <bool>();
var oldView = oldRenderer.ViewController.View;
var newView = newRenderer.ViewController.View;
oldView.Layer.RemoveAllAnimations();
newView.Alpha = 0;
oldView.Superview.InsertSubviewAbove(newView, oldView);
UIView.Animate(0.5, 0, UIViewAnimationOptions.BeginFromCurrentState, () => newView.Alpha = 1, () =>
{
task.TrySetResult(true);
});
return(task.Task);
}
protected virtual void SwitchFragment(FragmentManager manager, AView targetView, ShellItem newItem, bool animate = true)
{
Profile.FrameBegin();
Profile.FramePartition("IsDesignerContext");
if (AndroidContext.IsDesignerContext())
{
return;
}
Profile.FramePartition("CreateShellItemRenderer");
var previousRenderer = _currentRenderer;
_currentRenderer = CreateShellItemRenderer(newItem);
_currentRenderer.ShellItem = newItem;
var fragment = _currentRenderer.Fragment;
Profile.FramePartition("Transaction");
FragmentTransaction transaction = manager.BeginTransaction();
if (animate)
{
transaction.SetTransitionEx((int)global::Android.App.FragmentTransit.EnterMask);
}
transaction.ReplaceEx(_frameLayout.Id, fragment);
transaction.CommitAllowingStateLossEx();
Profile.FramePartition("OnDestroyed");
void OnDestroyed(object sender, EventArgs args)
{
previousRenderer.Destroyed -= OnDestroyed;
previousRenderer.Dispose();
previousRenderer = null;
}
if (previousRenderer != null)
{
previousRenderer.Destroyed += OnDestroyed;
}
Profile.FrameEnd();
}
protected virtual void SwitchFragment(FragmentManager manager, AView targetView, ShellItem newItem, bool animate = true)
{
var previousView = _currentView;
_currentView = CreateShellItemRenderer(newItem);
_currentView.ShellItem = newItem;
var fragment = _currentView.Fragment;
FragmentTransaction transaction = manager.BeginTransactionEx();
if (animate)
{
transaction.SetTransitionEx((int)global::Android.App.FragmentTransit.FragmentOpen);
}
transaction.ReplaceEx(_frameLayout.Id, fragment);
// Don't force the commit if this is our first load
if (previousView == null)
{
transaction
.SetReorderingAllowedEx(true);
}
transaction.CommitAllowingStateLossEx();
void OnDestroyed(object sender, EventArgs args)
{
previousView.Destroyed -= OnDestroyed;
previousView.Dispose();
previousView = null;
}
if (previousView != null)
{
previousView.Destroyed += OnDestroyed;
}
}
protected async void SetCurrentShellItemController(IShellItemRenderer value)
{
var oldRenderer = _currentShellItemRenderer;
var newRenderer = value;
_currentShellItemRenderer = value;
AddChildViewController(newRenderer.ViewController);
View.AddSubview(newRenderer.ViewController.View);
View.SendSubviewToBack(newRenderer.ViewController.View);
newRenderer.ViewController.View.Frame = View.Bounds;
if (oldRenderer != null)
{
var transition = CreateShellItemTransition();
await transition.Transition(oldRenderer, newRenderer);
oldRenderer.ViewController.RemoveFromParentViewController();
oldRenderer.ViewController.View.RemoveFromSuperview();
oldRenderer.Dispose();
}
}
protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
if (_currentRenderer != null && _currentRenderer.Fragment.IsAlive())
{
FragmentTransaction transaction = FragmentManager.BeginTransaction();
transaction.RemoveEx(_currentRenderer.Fragment);
transaction.CommitAllowingStateLossEx();
FragmentManager.ExecutePendingTransactionsEx();
}
Element.PropertyChanged -= OnElementPropertyChanged;
Element.SizeChanged -= OnElementSizeChanged;
((IShellController)Element).RemoveAppearanceObserver(this);
// This cast is necessary because IShellFlyoutRenderer doesn't implement IDisposable
(_flyoutRenderer as IDisposable)?.Dispose();
_currentRenderer.Dispose();
_currentRenderer = null;
}
Element = null;
// TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
// TODO: set large fields to null.
_disposed = true;
}
