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Resolve some life cycle issues with TabbedPage when nested inside a…
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… `NavigationPage` (#11530)

* Fix fragment manager life cycle with TabbbedPage

* - add additional tests

* - add more tests and fix a couple more found issues

* - remove testing code

* - fix up tabbedpage gallery

* - fix up tests

* - fix up fragment management

* - cleanup

* - add additional tests

* - add delay

* Update StackNavigationManager.cs

* Update TabbedPageTests.cs

* Update ControlsHandlerTestBase.cs

* - remove disable nullable

* - add comment fix traversal

* - cleanup Destory checking code and add gallery tests

* - cleanup handling of adapter key

* - comment out ios

* - fix scenarios where navpage gets disconnected mid navigation

* Update MultiPageFragmentStateAdapter.cs
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@PureWeen
PureWeen committed Feb 6, 2023
1 parent 3841372 commit f73f809
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Showing 33 changed files with 1,091 additions and 353 deletions.
2 changes: 1 addition & 1 deletion src/Compatibility/Core/src/Android/AppCompat/FlyoutPageContainer.cs
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Expand Up @@ -222,7 +222,7 @@ protected override void Dispose(bool disposing)

if (disposing)
{
if (_currentFragment != null && !FragmentManager.IsDestroyed)
if (_currentFragment != null && !FragmentManager.IsDestroyed(Context))
{
FragmentTransaction transaction = FragmentManager.BeginTransactionEx();
transaction.RemoveEx(_currentFragment);
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2 changes: 1 addition & 1 deletion src/Compatibility/Core/src/Android/AppCompat/FormsFragmentPagerAdapter.cs
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Expand Up @@ -84,7 +84,7 @@ protected override void Dispose(bool disposing)

_page = null;

if (!_fragmentManager.IsDestroyed)
if (!_fragmentManager.IsDestroyed(_page?.Handler?.MauiContext?.Context))
{
FragmentTransaction transaction = _fragmentManager.BeginTransactionEx();

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15 changes: 4 additions & 11 deletions src/Controls/samples/Controls.Sample/Pages/Compatibility/TabbedPageGallery.xaml
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Expand Up @@ -3,16 +3,9 @@
xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Maui.Controls.Sample.Pages.TabbedPageGallery"
xmlns:views="clr-namespace:Maui.Controls.Sample.Pages"
Title="Tabbed Page">
<ContentPage Title="Tab 1">
<VerticalStackLayout>
<Button Text="Set Tabbed Page as Root" Clicked="OnTabbedPageAsRoot"></Button>
<Button Text="Toggle Bottom Tabs (Android)" Clicked="OnSetToBottomTabs"></Button>
<Button Text="Change Tab Index" Clicked="OnChangeTabIndex"></Button>
<Button Text="Toggle TabBar Background Color" Clicked="OnToggleTabBar"></Button>
<Button Text="Toggle TabBar Text Color" Clicked="OnToggleTabBarTextColor"></Button>
<Button Text="Toggle Tab Item Selected" Clicked="OnToggleTabItemSelectedColor"></Button>
<Button Text="Toggle Tab Item UnselectedColor" Clicked="OnToggleTabItemUnSelectedColor"></Button>
</VerticalStackLayout>
</ContentPage>

<views:TabbedPageGalleryMainPage></views:TabbedPageGalleryMainPage>

</TabbedPage>
72 changes: 0 additions & 72 deletions src/Controls/samples/Controls.Sample/Pages/Compatibility/TabbedPageGallery.xaml.cs
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Expand Up @@ -14,77 +14,5 @@ public TabbedPageGallery()
this.Children.Add(new NavigationGallery());
this.Children.Add(new NavigationPage(new NavigationGallery()) { Title = "With Nav Page" });
}

void OnTabbedPageAsRoot(object sender, EventArgs e)
{
var topTabs =
new TabbedPage()
{
Children =
{
Handler.MauiContext.Services.GetRequiredService<Page>(),
new NavigationPage(new Pages.NavigationGallery()) { Title = "Navigation Gallery" }
}
};

this.Handler?.DisconnectHandler();
Application.Current.MainPage?.Handler?.DisconnectHandler();
Application.Current.MainPage = topTabs;
}

void OnSetToBottomTabs(object sender, EventArgs e)
{
var bottomTabs = new TabbedPage()
{
Children =
{
Handler.MauiContext.Services.GetRequiredService<Page>(),
new NavigationPage(new Pages.NavigationGallery()) { Title = "Navigation Gallery" }
}
};

this.Handler?.DisconnectHandler();
Application.Current.MainPage?.Handler?.DisconnectHandler();

AndroidSpecific.TabbedPage.SetToolbarPlacement(bottomTabs, AndroidSpecific.ToolbarPlacement.Bottom);
Application.Current.MainPage = bottomTabs;
}

void OnChangeTabIndex(object sender, EventArgs e)
{
CurrentPage = Children[1];
}

void OnToggleTabBar(object sender, EventArgs e)
{
if ((this.BarBackground as SolidColorBrush)?.Color == SolidColorBrush.Purple.Color)
this.BarBackground = null;
else
this.BarBackground = SolidColorBrush.Purple;
}

void OnToggleTabBarTextColor(object sender, EventArgs e)
{
if (this.BarTextColor == Colors.Green)
this.BarTextColor = null;
else
this.BarTextColor = Colors.Green;
}

void OnToggleTabItemUnSelectedColor(object sender, EventArgs e)
{
if (this.UnselectedTabColor == Colors.Blue)
this.UnselectedTabColor = null;
else
this.UnselectedTabColor = Colors.Blue;
}

void OnToggleTabItemSelectedColor(object sender, EventArgs e)
{
if (this.SelectedTabColor == Colors.Pink)
this.SelectedTabColor = null;
else
this.SelectedTabColor = Colors.Pink;
}
}
}
20 changes: 20 additions & 0 deletions src/Controls/samples/Controls.Sample/Pages/Compatibility/TabbedPageGalleryMainPage.xaml
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@@ -0,0 +1,20 @@
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage Title="Tab 1"
xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Maui.Controls.Sample.Pages.TabbedPageGalleryMainPage">
<ScrollView>
<VerticalStackLayout>
<Button Text="Set Tabbed Page as Root" Clicked="OnTabbedPageAsRoot"></Button>
<Button Text="Toggle Bottom Tabs (Android)" Clicked="OnSetToBottomTabs"></Button>
<Button Text="Change Tab Index" Clicked="OnChangeTabIndex"></Button>
<Button Text="Toggle TabBar Background Color" Clicked="OnToggleTabBar"></Button>
<Button Text="Toggle TabBar Text Color" Clicked="OnToggleTabBarTextColor"></Button>
<Button Text="Toggle Tab Item Selected" Clicked="OnToggleTabItemSelectedColor"></Button>
<Button Text="Toggle Tab Item UnselectedColor" Clicked="OnToggleTabItemUnSelectedColor"></Button>
<Button Text="Add Tab" Clicked="OnAddTab"></Button>
<Button Text="Remove Tab" Clicked="OnRemoveTab"></Button>
<Button Text="Remove All New Tabs" Clicked="OnRemoveAllTabs"></Button>
</VerticalStackLayout>
</ScrollView>
</ContentPage>
116 changes: 116 additions & 0 deletions src/Controls/samples/Controls.Sample/Pages/Compatibility/TabbedPageGalleryMainPage.xaml.cs
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@@ -0,0 +1,116 @@
using System;
using System.Linq;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Maui.Controls;
using Microsoft.Maui.Graphics;
using AndroidSpecific = Microsoft.Maui.Controls.PlatformConfiguration.AndroidSpecific;

namespace Maui.Controls.Sample.Pages
{
public partial class TabbedPageGalleryMainPage
{
public TabbedPageGalleryMainPage()
{
InitializeComponent();
}

TabbedPage _tabbedPage;
TabbedPage GetTabbedPage() => _tabbedPage ??= (TabbedPage)Parent;

void SetNewMainPage(Page page)
{
Application.Current.Windows[0].Page = page;
}

void OnTabbedPageAsRoot(object sender, EventArgs e)
{
var topTabs =
new TabbedPage()
{
Children =
{
Handler.MauiContext.Services.GetRequiredService<Page>(),
new NavigationPage(new Pages.NavigationGallery()) { Title = "Navigation Gallery" }
}
};

SetNewMainPage(topTabs);
}

void OnSetToBottomTabs(object sender, EventArgs e)
{
var bottomTabs = new TabbedPage()
{
Children =
{
Handler.MauiContext.Services.GetRequiredService<Page>(),
new NavigationPage(new Pages.NavigationGallery()) { Title = "Navigation Gallery" }
}
};

SetNewMainPage(bottomTabs);
AndroidSpecific.TabbedPage.SetToolbarPlacement(bottomTabs, AndroidSpecific.ToolbarPlacement.Bottom);
Application.Current.MainPage = bottomTabs;
}

void OnChangeTabIndex(object sender, EventArgs e)
{
GetTabbedPage().CurrentPage = GetTabbedPage().Children[1];
}

void OnToggleTabBar(object sender, EventArgs e)
{
if ((GetTabbedPage().BarBackground as SolidColorBrush)?.Color == SolidColorBrush.Purple.Color)
GetTabbedPage().BarBackground = null;
else
GetTabbedPage().BarBackground = SolidColorBrush.Purple;
}

void OnToggleTabBarTextColor(object sender, EventArgs e)
{
if (GetTabbedPage().BarTextColor == Colors.Green)
GetTabbedPage().BarTextColor = null;
else
GetTabbedPage().BarTextColor = Colors.Green;
}

void OnToggleTabItemUnSelectedColor(object sender, EventArgs e)
{
if (GetTabbedPage().UnselectedTabColor == Colors.Blue)
GetTabbedPage().UnselectedTabColor = null;
else
GetTabbedPage().UnselectedTabColor = Colors.Blue;
}

void OnToggleTabItemSelectedColor(object sender, EventArgs e)
{
if (GetTabbedPage().SelectedTabColor == Colors.Pink)
GetTabbedPage().SelectedTabColor = null;
else
GetTabbedPage().SelectedTabColor = Colors.Pink;
}

void OnRemoveTab(object sender, EventArgs e)
{
if (GetTabbedPage().Children.LastOrDefault() is TabbedPageGalleryMainPage mainPage)
{
GetTabbedPage().Children.Remove(mainPage);
}
}

void OnRemoveAllTabs(object sender, EventArgs e)
{
while (GetTabbedPage().Children.LastOrDefault() is TabbedPageGalleryMainPage mainPage)
{
GetTabbedPage().Children.Remove(mainPage);
}
}

void OnAddTab(object sender, EventArgs e)
{
GetTabbedPage()
.Children
.Add(new TabbedPageGalleryMainPage() { Title = $"Tab {GetTabbedPage().Children.Count}" });
}
}
}
27 changes: 2 additions & 25 deletions src/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellFragmentContainer.cs
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Expand Up @@ -23,32 +23,9 @@ public ShellFragmentContainer(ShellContent shellContent, IMauiContext mauiContex
public override AView OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
_page = ((IShellContentController)ShellContentTab).GetOrCreateContent();
_page.ToPlatform(_mauiContext, RequireContext(), inflater, ChildFragmentManager);

IMauiContext mauiContext = null;

// If the page has already been created with a handler then we just let it retain the same
// Handler and MauiContext
// But we want to update the inflater and ChildFragmentManager to match
// the handlers new home
if (_page.Handler?.MauiContext is MauiContext scopedMauiContext)
{
// If this page comes to us from a different activity then don't reuse it
// disconnect the handler so it can recreate against new MauiContext
if (scopedMauiContext.GetActivity() == Context.GetActivity())
{
scopedMauiContext.AddWeakSpecific(ChildFragmentManager);
scopedMauiContext.AddWeakSpecific(inflater);
mauiContext = scopedMauiContext;
}
else
{
_page.Handler.DisconnectHandler();
}
}

mauiContext ??= _mauiContext.MakeScoped(layoutInflater: inflater, fragmentManager: ChildFragmentManager);

return new ShellPageContainer(RequireContext(), (IPlatformViewHandler)_page.ToHandler(mauiContext), true)
return new ShellPageContainer(RequireContext(), (IPlatformViewHandler)_page.Handler, true)
{
LayoutParameters = new LP(LP.MatchParent, LP.MatchParent)
};
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53 changes: 32 additions & 21 deletions src/Controls/src/Core/HandlerImpl/NavigationPage/NavigationPage.Impl.cs
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Expand Up @@ -181,32 +181,36 @@ async Task SendHandlerUpdateAsync(
// Wait for pending navigation tasks to finish
await SemaphoreSlim.WaitAsync();

var currentNavRequestTaskSource = new TaskCompletionSource<object>();
_allPendingNavigationCompletionSource ??= new TaskCompletionSource<object>();

if (CurrentNavigationTask == null)
{
CurrentNavigationTask = _allPendingNavigationCompletionSource.Task;
}
else if (CurrentNavigationTask != _allPendingNavigationCompletionSource.Task)
// If our handler was removed while waiting then don't do anything
if (Handler != null)
{
throw new InvalidOperationException("Pending Navigations still processing");
}
var currentNavRequestTaskSource = new TaskCompletionSource<object>();
_allPendingNavigationCompletionSource ??= new TaskCompletionSource<object>();

_currentNavigationCompletionSource = currentNavRequestTaskSource;
if (CurrentNavigationTask == null)
{
CurrentNavigationTask = _allPendingNavigationCompletionSource.Task;
}
else if (CurrentNavigationTask != _allPendingNavigationCompletionSource.Task)
{
throw new InvalidOperationException("Pending Navigations still processing");
}

_currentNavigationCompletionSource = currentNavRequestTaskSource;

// We create a new list to send to the handler because the structure backing
// The Navigation stack isn't immutable
var immutableNavigationStack = new List<IView>(NavigationStack);
firePostNavigatingEvents?.Invoke();
// We create a new list to send to the handler because the structure backing
// The Navigation stack isn't immutable
var immutableNavigationStack = new List<IView>(NavigationStack);
firePostNavigatingEvents?.Invoke();

// Create the request for the handler
var request = new NavigationRequest(immutableNavigationStack, animated);
((IStackNavigation)this).RequestNavigation(request);
// Create the request for the handler
var request = new NavigationRequest(immutableNavigationStack, animated);
((IStackNavigation)this).RequestNavigation(request);

// Wait for the handler to finish processing the navigation
// This task completes once the handler calls INavigationView.Finished
await currentNavRequestTaskSource.Task;
// Wait for the handler to finish processing the navigation
// This task completes once the handler calls INavigationView.Finished
await currentNavRequestTaskSource.Task;
}
}
finally
{
Expand Down Expand Up @@ -245,6 +249,13 @@ private protected override void OnHandlerChangedCore()
})
.FireAndForget(Handler);
}

// If the handler is disconnected and we're still waiting for updates from the handler
// Just complete any waits
if (Handler == null && _waitingCount > 0)
{
((IStackNavigation)this).NavigationFinished(this.NavigationStack);
}
}

// Once we get all platforms over to the new APIs
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