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);
});
}
public ShellSectionNavigation(IFlyoutController flyoutController, ShellSection section) : base(Forms.NativeParent)
{
_section = section;
_section.PropertyChanged += OnSectionPropertyChanged;
_rootPage = ((IShellContentController)_section.CurrentItem).GetOrCreateContent();
_navBar = new ShellNavBar(flyoutController, this);
_navBar.Show();
var renderer = CreateShellSection(section);
renderer.Control.Show();
_navigationStack.AddLast(renderer.Control);
_pageToNative[_rootPage] = renderer.Control;
_nativeToPage[renderer.Control] = _rootPage;
IShellSectionController controller = _section as IShellSectionController;
controller.NavigationRequested += OnNavigationRequested;
controller.AddDisplayedPageObserver(this, UpdateDisplayedPage);
PackEnd(_navBar);
PackEnd(renderer.Control);
LayoutUpdated += OnLayoutUpdated;
((IShellController)_section.Parent.Parent).AddAppearanceObserver(this, _section);
}
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;
}
void OnLayoutUpdated(object sender, LayoutEventArgs e)
{
if (_navBarIsVisible)
{
_navBarHeight = _defaultNavBarHeight;
_navBar.Show();
_navBar.Move(e.Geometry.X, e.Geometry.Y);
_navBar.Resize(e.Geometry.Width, _navBarHeight);
}
else
{
_navBarHeight = 0;
_navBar.Hide();
}
CurrentNative.Show();
CurrentNative.Move(e.Geometry.X, e.Geometry.Y + _navBarHeight);
CurrentNative.Resize(e.Geometry.Width, e.Geometry.Height - _navBarHeight);
}