private void InsertViewsAtStart(_View owner, _View[] subviews)
{
#if __IOS__
for (int i = 0; i < subviews.Length; i++)
{
var subview = subviews[i];
owner.InsertSubview(subview, i);
}
#else
for (int i = 0; i < subviews.Length; i++)
{
var subview = subviews[i];
if (i == 0)
{
// First view goes below everything
owner.AddSubview(subview, NSWindowOrderingMode.Below, null);
}
else
{
// Other views go above previous
owner.AddSubview(subview, NSWindowOrderingMode.Above, subviews[i - 1]);
}
}
#endif
}
public void Insert(int index, IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
NativeView.InsertSubview(child.ToNative(MauiContext), index);
}
public void Insert(int index, IView child)
{
_ = PlatformView ?? throw new InvalidOperationException($"{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.InsertSubview(child.ToPlatform(MauiContext), targetIndex);
}
public void Add(IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} should have been set by base class.");
_ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} should have been set by base class.");
_ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} should have been set by base class.");
var targetIndex = VirtualView.GetLayoutHandlerIndex(child);
NativeView.InsertSubview(child.ToNative(MauiContext, true), targetIndex);
}
public void Update(int index, IView child)
{
_ = NativeView ?? throw new InvalidOperationException($"{nameof(NativeView)} 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 existing = NativeView.Subviews[index];
existing.RemoveFromSuperview();
NativeView.InsertSubview(child.ToNative(MauiContext), index);
NativeView.SetNeedsLayout();
}
public void Update(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 existing = PlatformView.Subviews[index];
existing.RemoveFromSuperview();
var targetIndex = VirtualView.GetLayoutHandlerIndex(child);
PlatformView.InsertSubview(child.ToPlatform(MauiContext), targetIndex);
PlatformView.SetNeedsLayout();
}
void EnsureZIndexOrder(IView child)
{
if (PlatformView.Subviews.Length == 0)
{
return;
}
PlatformView nativeChildView = child.ToPlatform(MauiContext !);
var currentIndex = PlatformView.Subviews.IndexOf(nativeChildView);
if (currentIndex == -1)
{
return;
}
var targetIndex = VirtualView.GetLayoutHandlerIndex(child);
if (currentIndex != targetIndex)
{
PlatformView.Subviews.RemoveAt(currentIndex);
PlatformView.InsertSubview(nativeChildView, targetIndex);
}
}