void InitializeComponent()
{
SetAlignment(-1, -1);
SetWeight(1, 1);
SetLayoutCallback(OnLayout);
_viewStack = new SimpleViewStack(Forms.NativeParent);
if (Device.Idiom == TargetIdiom.Phone)
{
_viewStack.BackgroundColor = ElmSharp.Color.White;
}
_viewStack.Show();
PackEnd(_viewStack);
_navBar = new ShellNavBar();
_navBar.Show();
PackEnd(_navBar);
IShellSectionController controller = ShellSection;
controller.NavigationRequested += OnNavigationRequested;
controller.AddDisplayedPageObserver(this, UpdateDisplayedPage);
((IShellController)Shell.Current).AddAppearanceObserver(this, ShellSection);
((IShellController)Shell.Current).AddFlyoutBehaviorObserver(_navBar);
_shellSectionRenderer = CreateShellSectionRenderer(ShellSection);
_shellSectionRenderer.NativeView.Show();
_viewStack.Push(_shellSectionRenderer.NativeView);
Device.BeginInvokeOnMainThread(() =>
{
(_shellSectionRenderer.NativeView as Widget)?.SetFocus(true);
});
}
void OnLayout()
{
if (Geometry.Width == 0 || Geometry.Height == 0)
{
return;
}
var bound = Geometry;
int navBarHeight;
if (NavBarIsVisible)
{
var navBound = bound;
navBarHeight = Forms.ConvertToScaledPixel(_navBar.GetDefaultHeight());
navBound.Height = navBarHeight;
_navBar.Show();
_navBar.Geometry = navBound;
_navBar.RaiseTop();
}
else
{
navBarHeight = 0;
_navBar.Hide();
}
bound.Y += navBarHeight;
bound.Height -= navBarHeight;
_viewStack.Geometry = bound;
}
