public void Insert(int index, IView child)
{
_ = PlatformView ?? throw new InvalidOperationException($"{nameof(PlatformView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
var targetIndex = VirtualView.GetLayoutHandlerIndex(child);
PlatformView.AddView(child.ToPlatform(MauiContext), targetIndex);
}
void UpdateContent()
{
_ = PlatformView ?? throw new InvalidOperationException($"{nameof(PlatformView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
PlatformView.RemoveAllViews();
if (VirtualView.PresentedContent is IView view)
{
PlatformView.AddView(view.ToPlatform(MauiContext));
}
}
public override void SetVirtualView(IView view)
{
base.SetVirtualView(view);
_ = PlatformView ?? throw new InvalidOperationException($"{nameof(PlatformView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
PlatformView.CrossPlatformMeasure = VirtualView.CrossPlatformMeasure;
PlatformView.CrossPlatformArrange = VirtualView.CrossPlatformArrange;
PlatformView.RemoveAllViews();
foreach (var child in VirtualView.OrderByZIndex())
{
PlatformView.AddView(child.ToPlatform(MauiContext));
}
}
void EnsureZIndexOrder(IView child)
{
if (PlatformView.ChildCount == 0)
{
return;
}
AView nativeChildView = child.ToPlatform(MauiContext !);
var currentIndex = IndexOf(PlatformView, nativeChildView);
if (currentIndex == -1)
{
return;
}
var targetIndex = VirtualView.GetLayoutHandlerIndex(child);
if (currentIndex != targetIndex)
{
PlatformView.RemoveViewAt(currentIndex);
PlatformView.AddView(nativeChildView, targetIndex);
}
}
