AView GetCurrentRootView()
{
return(WindowMauiContext
?.GetNavigationRootManager()
?.RootView ??
throw new InvalidOperationException("Current Root View cannot be null"));
}
partial void OnPageAttachedHandler()
{
WindowMauiContext.GetPlatformWindow().SetBackButtonPressedHandler(OnBackButtonPressed);
}
void SetCurrent(Page newPage, Page previousPage, bool popping, Action?completedCallback = null)
{
try
{
if (popping)
{
RemovePage(previousPage);
}
else if (newPage.BackgroundColor.IsDefault() && newPage.Background.IsEmpty)
{
RemovePage(previousPage);
}
if (popping)
{
previousPage
.FindMauiContext()
?.GetNavigationRootManager()
?.Disconnect();
previousPage.Handler = null;
// Un-parent the page; otherwise the Resources Changed Listeners won't be unhooked and the
// page will leak
previousPage.Parent = null;
}
if (Container == null || newPage == null)
{
return;
}
// pushing modal
if (!popping)
{
var modalContext =
WindowMauiContext
.MakeScoped(registerNewNavigationRoot: true);
newPage.Toolbar ??= new Toolbar(newPage);
_ = newPage.Toolbar.ToPlatform(modalContext);
var windowManager = modalContext.GetNavigationRootManager();
windowManager.Connect(newPage.ToPlatform(modalContext));
Container.AddPage(windowManager.RootView);
previousPage
.FindMauiContext()
?.GetNavigationRootManager()
?.UpdateAppTitleBar(false);
}
// popping modal
else
{
var windowManager = newPage.FindMauiContext()?.GetNavigationRootManager() ??
throw new InvalidOperationException("Previous Page Has Lost its MauiContext");
Container.AddPage(windowManager.RootView);
windowManager.UpdateAppTitleBar(true);
}
completedCallback?.Invoke();
}
catch (Exception error) when(error.HResult == -2147417842)
{
//This exception prevents the Main Page from being changed in a child
//window or a different thread, except on the Main thread.
//HEX 0x8001010E
throw new InvalidOperationException(
"Changing the current page is only allowed if it's being called from the same UI thread." +
"Please ensure that the new page is in the same UI thread as the current page.", error);
}
}
