void UntrackTarget(Page page)
{
if (page == null)
{
return;
}
if (page is FlyoutPage)
{
_flyoutDetails--;
}
if (page is Shell shell)
{
shell.Navigated -= OnShellNavigated;
shell.Navigating -= OnShellNavigating;
return;
}
((ObservableCollection <TMenuItem>)GetMenuItems(page)).CollectionChanged -= OnCollectionChanged;
page.Descendants().OfType <Page>().ForEach(UnregisterChildPage);
page.DescendantAdded -= OnChildAdded;
page.DescendantRemoved -= OnChildRemoved;
page.PropertyChanged -= OnPropertyChanged;
}
void TrackTarget(Page page)
{
if (page == null)
{
return;
}
if (page is FlyoutPage)
{
_flyoutDetails++;
}
((ObservableCollection <TMenuItem>)GetMenuItems(page)).CollectionChanged += OnCollectionChanged;
if (page is Shell shell)
{
shell.Navigated += OnShellNavigated;
shell.Navigating += OnShellNavigating;
if (shell.GetCurrentShellPage() is Page currentShellPage)
{
RegisterChildPage(currentShellPage);
}
return;
}
page.Descendants().OfType <Page>().ForEach(RegisterChildPage);
page.DescendantAdded += OnChildAdded;
page.DescendantRemoved += OnChildRemoved;
page.PropertyChanged += OnPropertyChanged;
}
void UntrackTarget(Page page)
{
if (page == null)
{
return;
}
if (page is FlyoutPage)
{
_flyoutDetails--;
}
((ObservableCollection <ToolbarItem>)page.ToolbarItems).CollectionChanged -= OnCollectionChanged;
page.Descendants().OfType <Page>().ForEach(UnregisterChildPage);
page.DescendantAdded -= OnChildAdded;
page.DescendantRemoved -= OnChildRemoved;
page.PropertyChanged -= OnPropertyChanged;
}
