void CheckShadow(Page page, bool pushed = false)
{
IReadOnlyList <Page> stack = Element?.Navigation?.NavigationStack;
if (pushed)
{
bool showShadow = stack?.Count > 1 ||
TitleViewExtensions.GetIsShadowVisible(page);
NavigationBar.Layer.ShadowOpacity = showShadow ? 0.5f : 0;
}
else
{
UpdateShadowOpacityOnPop(stack, page);
}
}
void UpdateShadowOpacityOnPop(IReadOnlyList <Page> stack, Page page = null)
{
if (stack != null && stack.Count <= 2)
{
bool shadowPropertyValue = false;
if (stack.Count > 1)
{
Page newPage = stack[stack.Count - 2];
shadowPropertyValue = TitleViewExtensions.GetIsShadowVisible(newPage);
}
bool hideShadow =
(page != null && stack?.Last <Page>() == page) &&
!shadowPropertyValue;
NavigationBar.Layer.ShadowOpacity = hideShadow ? 0 : 0.5f;
}
}
public MainPage()
{
InitializeComponent();
TitleViewExtensions.SetIsShadowVisible(this, false);
}