protected override void OnElementChanged(ElementChangedEventArgs <TabbedPage> e)
{
base.OnElementChanged(e);
_tabLayout = ViewGroup.FindChildOfType <TabLayout>();
if (_tabLayout == null)
{
Console.WriteLine("No TabLayout found. Badge not added.");
return;
}
_tabbedPage = e.NewElement as TabbedPage;
_viewPager = (ViewPager)GetChildAt(0);
_tabLayout.TabSelected += (s, a) => {
var page = _tabbedPage.Children[a.Tab.Position];
if (page is TabbedPage)
{
var tabPage = (TabbedPage)page;
SetTab(a.Tab, tabPage.Icon.File);
}
_viewPager.SetCurrentItem(a.Tab.Position, false);
};
_tabLayout.TabUnselected += (s, a) => {
var page = _tabbedPage.Children[a.Tab.Position];
if (page is TabbedPage)
{
SetTab(a.Tab, page.Icon.File);
}
};
_tabView = _tabLayout.FindChildOfType <TabLayout.TabView>();
for (var i = 0; i < _tabLayout.TabCount; i++)
{
AddTabBadge(i);
}
Element.ChildAdded += OnTabAdded;
Element.ChildRemoved += OnTabRemoved;
}
public static void ApplyBadge(this TabLayout.TabView tabView, XColor color, string text,
XColor textColor)
{
if (!tabView.GetChildrenOfType <BadgeFrameLayout>().Any())
{
tabView.SetClipChildren(false);
tabView.SetClipToPadding(false);
TextView tabTextView = tabView.GetChildrenOfType <TextView>().Single();
tabView.RemoveView(tabTextView);
FrameLayout badgeContainerFrameLayout = new FrameLayout(tabView.Context)
{
LayoutParameters = new FrameLayout.LayoutParams(LP.WrapContent, LP.WrapContent)
};
badgeContainerFrameLayout.AddView(tabTextView);
BadgeFrameLayout badgeContainer = CreateBadgeContainer(tabView.Context);
badgeContainer.Visibility = !string.IsNullOrEmpty(text) ? ViewStates.Visible : ViewStates.Invisible;
badgeContainer.Background = CreateBadgeBackground(tabView.Context, color);
badgeContainer.AddView(CreateBadgeText(tabView.Context, text, textColor));
badgeContainerFrameLayout.AddView(badgeContainer);
tabView.AddView(badgeContainerFrameLayout);
}
else
{
BadgeFrameLayout badgeContainer = tabView.GetChildrenOfType <BadgeFrameLayout>().Single();
badgeContainer.Visibility = !string.IsNullOrEmpty(text) ? ViewStates.Visible : ViewStates.Invisible;
((PaintDrawable)badgeContainer.Background).Paint.Color = color.IsDefault ? XColor.FromRgb(255, 59, 48).ToAndroid() : color.ToAndroid();
TextView textView = (TextView)badgeContainer.GetChildAt(0);
textView.Text = text;
textView.SetTextColor(textColor.IsDefault ? XColor.White.ToAndroid() : textColor.ToAndroid());
}
}
