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);
});
}
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);
}
Task <bool> SwitchContentAsync(Page page, bool animated, bool removed = false, bool popToRoot = 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 = page;
((Platform)Element.Platform).NavAnimationInProgress = true;
FragmentTransaction transaction = FragmentManager.BeginTransaction();
if (animated)
{
SetupPageTransition(transaction, !removed);
}
if (_fragmentStack.Count == 0)
{
transaction.Add(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.Remove(currentToRemove);
popPage = popToRoot;
}
Fragment toShow = _fragmentStack.Last();
// Execute pending transactions so that we can be sure the fragment list is accurate.
FragmentManager.ExecutePendingTransactions();
if (FragmentManager.Fragments.Contains(toShow))
{
transaction.Show(toShow);
}
else
{
transaction.Add(Id, toShow);
}
}
else
{
// push
Fragment currentToHide = _fragmentStack.Last();
transaction.Hide(currentToHide);
transaction.Add(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.CommitAllowingStateLoss();
// 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 && ((INavigationPageController)Element).StackDepth == 2)
{
AnimateArrowIn();
}
}
else if (_drawerToggle != null && ((INavigationPageController)Element).StackDepth == 2)
{
AnimateArrowOut();
}
Device.StartTimer(TimeSpan.FromMilliseconds(TransitionDuration), () =>
{
tcs.TrySetResult(true);
fragment.UserVisibleHint = true;
if (removed)
{
UpdateToolbar();
}
return(false);
});
}
else
{
Device.StartTimer(TimeSpan.FromMilliseconds(1), () =>
{
tcs.TrySetResult(true);
fragment.UserVisibleHint = true;
UpdateToolbar();
return(false);
});
}
Context.HideKeyboard(this);
((Platform)Element.Platform).NavAnimationInProgress = false;
// TransitionDuration is how long the built-in animations are, and they are "reversible" in the sense that starting another one slightly before it's done is fine
return(tcs.Task);
}