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using System;
using CoreGraphics;
namespace Xamarin.Forms.Platform.MacOS
{
internal class LayoutRenderer : DefaultRenderer
{
CGRect _bounds;
public override void Layout()
{
base.Layout();
if (_bounds == Bounds)
return;
_bounds = Bounds;
//when the layout changes we might need to update the children position based in our new size,
//this is only needed in MacOS because of the inversion of the Y coordinate.
//Forms layout system doesn't know we need to relayout the other items ,(first ones for example)
//so we do it here
for (int i = 0; i < Subviews.Length; i++)
{
var item = Subviews[i] as IVisualElementRenderer;
if (item == null)
continue;
var oldFrame = item.NativeView.Frame;
var newY = Math.Max(0, (float)(Element.Height - item.Element.Height - item.Element.Y));
if (oldFrame.Y == newY)
continue;
var newPosition = new CGPoint(oldFrame.X, newY);
item.NativeView.Frame = new CGRect(newPosition, oldFrame.Size);
Console.WriteLine($"New Frame - {item.NativeView.Frame}");
}
}
}
}
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