void DisposeChildRenderers()
{
IVisualElementRenderer childRenderer = APlatform.GetRenderer(_childView);
childRenderer?.Dispose();
_childView?.ClearValue(APlatform.RendererProperty);
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
if (_childView == null)
{
return;
}
Rectangle bounds = GetBounds(_isFlyout, l, t, r, b);
if (_isFlyout)
{
FlyoutPageController.FlyoutBounds = bounds;
}
else
{
FlyoutPageController.DetailBounds = bounds;
}
IVisualElementRenderer renderer = APlatform.GetRenderer(_childView);
renderer?.UpdateLayout();
// If we're using a PageContainer (i.e., we've wrapped our contents in a Fragment),
// Make sure that it gets laid out
if (_pageContainer != null)
{
if (_isFlyout)
{
var controller = (IFlyoutPageController)_parent;
var width = (int)Context.ToPixels(controller.FlyoutBounds.Width);
// When the base class computes the size of the Flyout container, it starts at the top of the
// screen and adds padding (_parent.FlyoutBounds.Top) to leave room for the status bar
// When this container is laid out, it's already starting from the adjusted y value of the parent,
// so we subtract _parent.FlyoutBounds.Top from our starting point (to get 0) and add it to the
// bottom (so the flyout page stretches to the bottom of the screen)
var height = (int)Context.ToPixels(controller.FlyoutBounds.Height + controller.FlyoutBounds.Top);
_pageContainer.Layout(0, 0, width, height);
}
else
{
_pageContainer.Layout(l, t, r, b);
}
_pageContainer.Child.UpdateLayout();
}
}
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
DeviceDisplay.MainDisplayInfoChanged -= DeviceInfoPropertyChanged;
if (NavigationPageController != null)
{
var navController = NavigationPageController;
navController.PushRequested -= OnPushed;
navController.PopRequested -= OnPopped;
navController.PopToRootRequested -= OnPoppedToRoot;
navController.InsertPageBeforeRequested -= OnInsertPageBeforeRequested;
navController.RemovePageRequested -= OnRemovePageRequested;
}
if (Current != null)
{
Current.PropertyChanged -= CurrentOnPropertyChanged;
}
FragmentManager fm = FragmentManager;
if (!fm.IsDestroyed)
{
FragmentTransaction trans = fm.BeginTransactionEx();
foreach (Fragment fragment in _fragmentStack)
{
trans.RemoveEx(fragment);
}
trans.CommitAllowingStateLossEx();
fm.ExecutePendingTransactionsEx();
}
_toolbar.RemoveView(_titleView);
_titleView?.Dispose();
_titleView = null;
if (_titleViewRenderer != null)
{
Platform.ClearRenderer(_titleViewRenderer.View);
_titleViewRenderer.Dispose();
_titleViewRenderer = null;
}
_toolbar.RemoveView(_titleIconView);
_titleIconView?.Dispose();
_titleIconView = null;
_imageSource = null;
if (_toolbarTracker != null)
{
_toolbarTracker.CollectionChanged -= ToolbarTrackerOnCollectionChanged;
_toolbar.DisposeMenuItems(_currentToolbarItems, OnToolbarItemPropertyChanged);
_toolbarTracker.Target = null;
_toolbarTracker = null;
}
if (_currentMenuItems != null)
{
_currentMenuItems.Clear();
_currentMenuItems = null;
}
if (_currentToolbarItems != null)
{
_currentToolbarItems.Clear();
_currentToolbarItems = null;
}
if (_toolbar != null)
{
_toolbar.SetNavigationOnClickListener(null);
_toolbar.Menu.Clear();
RemoveView(_toolbar);
_toolbar.Dispose();
_toolbar = null;
}
if (_drawerLayout.IsAlive() && _drawerListener.IsAlive())
{
_drawerLayout.RemoveDrawerListener(_drawerListener);
RemoveView(_drawerLayout);
}
if (_drawerListener != null)
{
_drawerListener.Dispose();
_drawerListener = null;
}
if (_drawerToggle != null)
{
_drawerToggle.ToolbarNavigationClickListener = null;
_drawerToggle.Dispose();
_drawerToggle = null;
}
if (_backgroundDrawable != null)
{
_backgroundDrawable.Dispose();
_backgroundDrawable = null;
}
Current = null;
// We dispose the child renderers after cleaning up everything related to DrawerLayout in case
// one of the children is a FlyoutPage (which may dispose of the DrawerLayout).
if (Element != null)
{
foreach (Element element in PageController.InternalChildren)
{
var child = element as VisualElement;
if (child == null)
{
continue;
}
IVisualElementRenderer renderer = Platform.GetRenderer(child);
renderer?.Dispose();
}
}
}
base.Dispose(disposing);
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
_disposed = true;
if (Element != null)
{
PageController.InternalChildren.CollectionChanged -= OnChildrenCollectionChanged;
foreach (Page pageToRemove in Element.Children)
{
TeardownPage(pageToRemove);
}
}
RemoveAllViews();
if (_viewPager != null)
{
_viewPager.ClearOnPageChangeListeners();
_viewPager.Adapter.Dispose();
_viewPager.Dispose();
_viewPager = null;
}
if (_tabLayout != null)
{
_tabLayout.ClearOnTabSelectedListeners();
_tabLayout.Dispose();
_tabLayout = null;
}
if (_bottomNavigationView != null)
{
_bottomNavigationView.SetOnItemSelectedListener(null);
_bottomNavigationView.Dispose();
_bottomNavigationView = null;
}
if (_relativeLayout != null)
{
_relativeLayout.Dispose();
_relativeLayout = null;
}
if (Element != null)
{
foreach (Page pageToRemove in Element.Children)
{
IVisualElementRenderer pageRenderer = Platform.GetRenderer(pageToRemove);
pageRenderer?.Dispose();
pageToRemove.ClearValue(Platform.RendererProperty);
}
}
_previousPage = null;
}
base.Dispose(disposing);
}
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;
}
}
