void RemovePage(Page page)
{
if (!_isAttachedToWindow)
{
PushCurrentPages();
}
Fragment fragment = GetPageFragment(page);
if (fragment == null)
{
return;
}
#if DEBUG
// Enables logging of moveToState operations to logcat
FragmentManager.EnableDebugLogging(true);
#endif
// Go ahead and take care of the fragment bookkeeping for the page being removed
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
transaction.RemoveEx(fragment);
transaction.CommitAllowingStateLossEx();
// And remove the fragment from our own stack
_fragmentStack.Remove(fragment);
Device.StartTimer(TimeSpan.FromMilliseconds(10), () =>
{
UpdateToolbar();
return(false);
});
}
void AddTransitionTimer(TaskCompletionSource <bool> tcs, Fragment fragment, FragmentManager fragmentManager, IReadOnlyCollection <Fragment> fragmentsToRemove, int duration, bool shouldUpdateToolbar)
{
Device.StartTimer(TimeSpan.FromMilliseconds(duration), () =>
{
tcs.TrySetResult(true);
Current?.SendAppearing();
if (shouldUpdateToolbar)
{
UpdateToolbar();
}
if (fragmentsToRemove.Count > 0)
{
FragmentTransaction fragmentTransaction = fragmentManager.BeginTransactionEx();
foreach (Fragment frag in fragmentsToRemove)
{
fragmentTransaction.RemoveEx(frag);
}
fragmentTransaction.CommitAllowingStateLossEx();
}
return(false);
});
}
Task <bool> SwitchContentAsync(Page page, bool animated, bool removed = false, bool popToRoot = false)
{
if (!Element.IsAttachedToRoot())
{
return(Task.FromResult(false));
}
var tcs = new TaskCompletionSource <bool>();
Fragment fragment = GetFragment(page, removed, popToRoot);
#if DEBUG
// Enables logging of moveToState operations to logcat
FragmentManager.EnableDebugLogging(true);
#endif
Current?.SendDisappearing();
Current = page;
if (Platform != null)
{
Platform.NavAnimationInProgress = true;
}
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
if (animated)
{
SetupPageTransition(transaction, !removed);
}
var fragmentsToRemove = new List <Fragment>();
if (_fragmentStack.Count == 0)
{
transaction.AddEx(Id, fragment);
_fragmentStack.Add(fragment);
}
else
{
if (removed)
{
// pop only one page, or pop everything to the root
var popPage = true;
while (_fragmentStack.Count > 1 && popPage)
{
Fragment currentToRemove = _fragmentStack.Last();
_fragmentStack.RemoveAt(_fragmentStack.Count - 1);
transaction.HideEx(currentToRemove);
fragmentsToRemove.Add(currentToRemove);
popPage = popToRoot;
}
Fragment toShow = _fragmentStack.Last();
// Execute pending transactions so that we can be sure the fragment list is accurate.
FragmentManager.ExecutePendingTransactionsEx();
if (FragmentManager.Fragments.Contains(toShow))
{
transaction.ShowEx(toShow);
}
else
{
transaction.AddEx(Id, toShow);
}
}
else
{
// push
Fragment currentToHide = _fragmentStack.Last();
transaction.HideEx(currentToHide);
transaction.AddEx(Id, fragment);
_fragmentStack.Add(fragment);
}
}
// We don't currently support fragment restoration, so we don't need to worry about
// whether the commit loses state
transaction.CommitAllowingStateLossEx();
// The fragment transitions don't really SUPPORT telling you when they end
// There are some hacks you can do, but they actually are worse than just doing this:
if (animated)
{
if (!removed)
{
UpdateToolbar();
if (_drawerToggle != null && NavigationPageController.StackDepth == 2)
{
AnimateArrowIn();
}
}
else if (_drawerToggle != null && NavigationPageController.StackDepth == 2)
{
AnimateArrowOut();
}
AddTransitionTimer(tcs, fragment, FragmentManager, fragmentsToRemove, TransitionDuration, removed);
}
else
{
AddTransitionTimer(tcs, fragment, FragmentManager, fragmentsToRemove, 1, true);
}
Context.HideKeyboard(this);
if (Platform != null)
{
Platform.NavAnimationInProgress = false;
}
return(tcs.Task);
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
_disposed = true;
if (_titleViewRenderer != null)
{
Android.Platform.ClearRenderer(_titleViewRenderer.View);
_titleViewRenderer.Dispose();
_titleViewRenderer = null;
}
_toolbar.RemoveView(_titleView);
_titleView?.Dispose();
_titleView = null;
_toolbar.RemoveView(_titleIconView);
_titleIconView?.Dispose();
_titleIconView = null;
_imageSource = null;
if (_toolbarTracker != null)
{
_toolbarTracker.CollectionChanged -= ToolbarTrackerOnCollectionChanged;
_toolbarTracker.Target = null;
_toolbarTracker = null;
}
if (_toolbar != null)
{
_toolbar.SetNavigationOnClickListener(null);
_toolbar.Dispose();
_toolbar = null;
}
if (_drawerLayout != null && _drawerListener != null)
{
_drawerLayout.RemoveDrawerListener(_drawerListener);
}
if (_drawerListener != null)
{
_drawerListener.Dispose();
_drawerListener = null;
}
if (_drawerToggle != 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 MasterDetailPage (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 = Android.Platform.GetRenderer(child);
renderer?.Dispose();
}
var navController = NavigationPageController;
navController.PushRequested -= OnPushed;
navController.PopRequested -= OnPopped;
navController.PopToRootRequested -= OnPoppedToRoot;
navController.InsertPageBeforeRequested -= OnInsertPageBeforeRequested;
navController.RemovePageRequested -= OnRemovePageRequested;
}
Device.Info.PropertyChanged -= DeviceInfoPropertyChanged;
// API only exists on newer android YAY
if ((int)Build.VERSION.SdkInt >= 17)
{
FragmentManager fm = FragmentManager;
if (!fm.IsDestroyed)
{
FragmentTransaction trans = fm.BeginTransactionEx();
foreach (Fragment fragment in _fragmentStack)
{
trans.RemoveEx(fragment);
}
trans.CommitAllowingStateLossEx();
fm.ExecutePendingTransactionsEx();
}
}
}
base.Dispose(disposing);
}
