Redid layout, so padding is taken care of at the abstract level. This lets it be re-used by all layouts.

sample/Comet.Samples/Views/ViewLayoutTestCase.cs

@@ -9,9 +9,61 @@ namespace Comet.Samples
 	public  class ViewLayoutTestCase : View
 	{
 		[Body]
-		View view() => new ScrollView
-					   {
+		View view() =>  new ScrollView {
 			new VStack(){
+
+				new VStack
+				{
+					new Text(()=> "Recommended")
+						.Color(Colors.Black)
+						.FontFamily("Rockolf Bold")
+						.FontSize(20)
+						.FontWeight(FontWeight.Bold)
+						.Margin(new Thickness(0, 6)),
+					new ScrollView(Orientation.Horizontal) {
+						new HStack
+						{
+							Enumerable.Range(0,10).Select(destination => new ZStack
+						{
+							// Destination Background Image
+							new Image()
+								.Background(Colors.SkyBlue).FillHorizontal().FillVertical()
+								.ClipShape(new RoundedRectangle(36)),
+							new VStack(Comet.HorizontalAlignment.Leading) {
+								new VStack
+								{
+									new Text(() => "$100")
+										.Color(Colors.White)
+										.FitHorizontal()
+										.FontSize(14)
+										.FontFamily("Rockolf Bold")
+										.FontSize(14)
+										.FontWeight(FontWeight.Bold),
+								}.FitHorizontal().Frame(alignment: Alignment.Trailing)
+									.Background(Color.FromArgb("#67AEE9"))
+									.ClipShape(new RoundedRectangle(12))
+									.Padding(6)
+									.Margin(12),
+
+								new Spacer(),
+								new Text("Japan Street")
+									.Color(Colors.White)
+									.FontFamily("Rockolf Bold")
+									.FontSize(18)
+									.FontWeight(FontWeight.Bold)
+									.Shadow(radius: 6),
+								new Text("Awesome Sauce")
+									.Color(Colors.White)
+									.FontFamily("Rockolf")
+									.FontSize(14),
+							}
+							.Padding(new Thickness(16, 0, 0, 16))
+						}.Frame(height: 250, width: 200))
+						}
+					}
+				},
+
+
 				new Text("ZSTack Alignment"),
 				new ZStack
 				{

sample/Comet.SingleProject.Sample/Comet.SingleProject.Sample.csproj

@@ -46,4 +46,5 @@
 		<RuntimeIdentifier>win-x64</RuntimeIdentifier>
 		<WindowsPackageType>MSIX</WindowsPackageType>
 	</PropertyGroup>
+	<ProjectExtensions><VisualStudio><UserProperties XamarinHotReloadDebuggerTimeoutExceptionCometSingleProjectSampleHideInfoBar="True" /></VisualStudio></ProjectExtensions>
 </Project>

src/Comet/Controls/AbstractLayout.cs

@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using Microsoft.Maui;
 using Microsoft.Maui.Graphics;
 using Microsoft.Maui.Layouts;
+using Microsoft.Maui.Primitives;
 
 namespace Comet
 {
@@ -43,11 +44,7 @@ namespace Comet
 		{
 			base.LayoutSubviews(frame);
 			var padding = this.GetPadding();
-			var bounds = new Rectangle(
-				padding.Left,
-				padding.Right,
-				frame.Width - padding.HorizontalThickness,
-				frame.Height - padding.VerticalThickness);
+			var bounds = new Rectangle(Point.Zero, Frame.Size);//.ApplyPadding(padding);
 			CrossPlatformArrange(bounds);
 		}
 
@@ -55,9 +52,51 @@ namespace Comet
 		{
 			if (IsMeasureValid)
 				return MeasuredSize;
-			MeasuredSize = LayoutManager.Measure(availableSize.Width, availableSize.Height);
+
+			var frameConstraints = this.GetFrameConstraints();
+
+			var layoutVerticalSizing = ((IView)this).VerticalLayoutAlignment;
+			var layoutHorizontalSizing = ((IView)this).HorizontalLayoutAlignment;
+
+
+			double widthConstraint = frameConstraints?.Width > 0 ? frameConstraints.Width.Value : availableSize.Width;
+			double heightConstraint = frameConstraints?.Height > 0 ? frameConstraints.Height.Value : availableSize.Height;
+
+			//Lets adjust for padding
+			var padding = this.GetPadding();
+			if(!double.IsInfinity(widthConstraint))
+				widthConstraint -= padding.HorizontalThickness;
+			if (!double.IsInfinity(heightConstraint))
+				heightConstraint -= padding.VerticalThickness;
+
+
+			var measured = LayoutManager.Measure(widthConstraint, heightConstraint);
+
+
+			if (frameConstraints?.Height > 0 && frameConstraints?.Width > 0)
+			{
+				measured = new Size(frameConstraints.Width.Value, frameConstraints.Height.Value);
+			}
+			else
+			{
+				if (layoutVerticalSizing == LayoutAlignment.Fill && !double.IsInfinity(heightConstraint))
+					measured.Height = heightConstraint;
+				if (layoutHorizontalSizing == LayoutAlignment.Fill && !double.IsInfinity(widthConstraint))
+					measured.Width = widthConstraint;
+
+				if (!double.IsInfinity(measured.Width))
+					measured.Width += padding.HorizontalThickness;
+				if (!double.IsInfinity(measured.Height))
+					measured.Height += padding.VerticalThickness;
+			}
+
+			var margin = this.GetMargin();
+			if(!double.IsInfinity(measured.Width))
+				measured.Width += margin.HorizontalThickness;
+			if (!double.IsInfinity(measured.Height))
+				measured.Height += margin.VerticalThickness;
 			IsMeasureValid = true;
-			return MeasuredSize;
+			return MeasuredSize = measured;
 		}
 
 		protected override void Dispose(bool disposing)
@@ -68,7 +107,9 @@ namespace Comet
 
 		public virtual Size CrossPlatformMeasure(double widthConstraint, double heightConstraint) => GetDesiredSize(new Size(widthConstraint,heightConstraint));
 		public virtual Size CrossPlatformArrange(Rectangle bounds) {
-			LayoutManager?.ArrangeChildren(bounds);
+			var padding = this.GetPadding();
+			var b = bounds.ApplyPadding(padding);
+			LayoutManager?.ArrangeChildren(b);
 			return this.MeasuredSize;
 		}
 	}

src/Comet/Controls/View.cs

@@ -556,6 +556,7 @@ namespace Comet
 				var fe = (IView)this;
 
 				var frameConstraints = this.GetFrameConstraints();
+				var margins = fe.Margin;
 
 				if (frameConstraints?.Height > 0 && frameConstraints?.Width > 0)
 					return new Size(frameConstraints.Width.Value, frameConstraints.Height.Value);
@@ -564,8 +565,9 @@ namespace Comet
 					ms.Width = fe.Width;
 				if (fe.Height > 0)
 					ms.Height = fe.Height;
-				//TODO: Remove this when we get some LayoutOptions...
-				//This check ignores MArgin which is bad
+
+				ms.Width += margins.HorizontalThickness;
+				ms.Height += margins.HorizontalThickness;
 				var hSizing = this.GetHorizontalLayoutAlignment(this.Parent as ContainerView);
 				var vSizing = this.GetVerticalLayoutAlignment(this.Parent as ContainerView);
 				if (hSizing == LayoutAlignment.Fill && !double.IsInfinity(availableSize.Width))

src/Comet/Helpers/LayoutExtensions.cs

@@ -106,13 +106,16 @@ namespace Comet
 				frame.Width -= margin.HorizontalThickness;
 				frame.Height -= margin.VerticalThickness;
 			}
+			if (!view.MeasurementValid)
+			{
+				var sizeThatFits = view.Measure(frame.Size.Width, frame.Size.Height);
+				view.MeasuredSize = sizeThatFits;
+				view.MeasurementValid = true;
+			}
 
-			var sizeThatFits = view.Measure(frame.Size.Width,frame.Size.Height);
-			view.MeasuredSize = sizeThatFits;
-			view.MeasurementValid = true;
 
-			var width = sizeThatFits.Width;
-			var height = sizeThatFits.Height;
+			var width = view.MeasuredSize.Width - margin.HorizontalThickness;
+			var height = view.MeasuredSize.Height - margin.VerticalThickness;
 
 			var frameConstraints = view.GetFrameConstraints();
 
@@ -164,7 +167,7 @@ namespace Comet
 
 			var x = frame.X + ((frame.Width - width) * xFactor);
 			var y = frame.Y + ((frame.Height - height) * yFactor);
-			view.Frame = new Rectangle((float)x, (float)y, width, height);
+			view.Frame = new Rectangle(x, y, width, height);
 		}
 
 		public static T FillHorizontal<T>(this T view, bool cascades = false) where T : View

src/Comet/Layout/HStackLayoutManager.cs

@@ -20,8 +20,7 @@ namespace Comet.Layout
 		ContainerView layout;
 		public Size ArrangeChildren(Rectangle rect)
 		{
-			var padding = layout.GetPadding();
-			var layoutRect = rect.ApplyPadding(padding);
+			var layoutRect = rect;
 			double spacerWidth = (layoutRect.Width - childrenWidth) / spacerCount;
 
 			foreach (var view in layout)
@@ -34,7 +33,7 @@ namespace Comet.Layout
 
 				var size = view.MeasuredSize;
 				layoutRect.Width = size.Width;
-				view.SetFrameFromNativeView(layoutRect);
+				view.LayoutSubviews(layoutRect);
 				layoutRect.X = view.Frame.Right + _spacing;
 			}
 			return new Size(layoutRect.Left, layoutRect.Bottom);
@@ -42,23 +41,9 @@ namespace Comet.Layout
 
 		int spacerCount;
 		double childrenWidth;
-		public Size Measure(double wConstraint, double hConstraint)
+		public Size Measure(double widthConstraint, double heightConstraint)
 		{
 			//Lets adjust for Frame settings
-			var frameConstraints = layout.GetFrameConstraints();
-
-			var layoutVerticalSizing = ((IView)layout).VerticalLayoutAlignment;
-			var layoutHorizontalSizing = ((IView)layout).HorizontalLayoutAlignment;
-
-
-			double widthConstraint = frameConstraints?.Width > 0 ? frameConstraints.Width.Value : wConstraint;
-			double heightConstraint = frameConstraints?.Height > 0 ? frameConstraints.Height.Value : hConstraint;
-
-			//Lets adjust for padding
-			var padding = layout.GetPadding();
-			widthConstraint -= padding.HorizontalThickness;
-			heightConstraint -= padding.VerticalThickness;
-
 			var index = 0;
 			double width = 0;
 			double height = 0;
@@ -109,16 +94,6 @@ namespace Comet.Layout
 			if (spacerCount > 0)
 				width = widthConstraint;
 
-			if (layoutVerticalSizing == LayoutAlignment.Fill && !double.IsInfinity(heightConstraint))
-				height = heightConstraint;
-			if (layoutHorizontalSizing == LayoutAlignment.Fill && !double.IsInfinity(widthConstraint))
-				width = widthConstraint;
-
-			width += padding.VerticalThickness;
-			height += padding.HorizontalThickness;
-
-			if (frameConstraints?.Height > 0 && frameConstraints?.Width > 0)
-				return new Size(frameConstraints.Width.Value, frameConstraints.Height.Value);
 
 			return new Size(width, height);
 		}

src/Comet/Layout/VStackLayoutManager.cs

@@ -18,8 +18,7 @@ public class VStackLayoutManager : Microsoft.Maui.Layouts.ILayoutManager
 	ContainerView layout;
 	public Size ArrangeChildren(Rectangle rect)
 	{
-		var padding = layout.GetPadding();
-		var layoutRect = rect.ApplyPadding(padding);
+		var layoutRect = rect;
 		double spacerHeight = (layoutRect.Height - childrenHeight) / spacerCount;
 		foreach (var view in layout)
 		{
@@ -32,7 +31,7 @@ public class VStackLayoutManager : Microsoft.Maui.Layouts.ILayoutManager
 
 			var size = view.MeasuredSize;
 			layoutRect.Height = size.Height;
-			view.SetFrameFromNativeView(layoutRect);
+			view.LayoutSubviews(layoutRect);
 			layoutRect.Y = view.Frame.Bottom + _spacing;
 
 		}
@@ -41,22 +40,8 @@ public class VStackLayoutManager : Microsoft.Maui.Layouts.ILayoutManager
 
 	int spacerCount;
 	double childrenHeight;
-	public Size Measure(double wConstraint, double hConstraint)
+	public Size Measure(double widthConstraint, double heightConstraint)
 	{
-		//Lets adjust for Frame settings
-		var frameConstraints = layout.GetFrameConstraints();
-
-		var layoutVerticalSizing = ((IView)layout).VerticalLayoutAlignment;
-		var layoutHorizontalSizing = ((IView)layout).HorizontalLayoutAlignment;
-		
-
-		double widthConstraint = frameConstraints?.Width > 0 ? frameConstraints.Width.Value : wConstraint;
-		double heightConstraint = frameConstraints?.Height > 0 ? frameConstraints.Height.Value : hConstraint;
-
-		//Lets adjust for padding
-		var padding = layout.GetPadding();
-		widthConstraint -= padding.HorizontalThickness;
-		heightConstraint -= padding.VerticalThickness;
 
 		var index = 0;
 		double width = 0;
@@ -111,21 +96,6 @@ public class VStackLayoutManager : Microsoft.Maui.Layouts.ILayoutManager
 		if (spacerCount > 0)
 			height = heightConstraint;
 
-		var layoutMargin = layout.GetMargin();
-
-		if (layoutHorizontalSizing == LayoutAlignment.Fill && !double.IsInfinity(widthConstraint))
-			width = widthConstraint;
-
-		if (layoutVerticalSizing == LayoutAlignment.Fill && !double.IsInfinity(heightConstraint))
-			height = heightConstraint - layoutMargin.VerticalThickness;
-
-		width += padding.VerticalThickness;
-		height += padding.HorizontalThickness;
-		if (frameConstraints?.Height > 0 && frameConstraints?.Width > 0)
-		{
-			return new Size(frameConstraints.Width.Value, frameConstraints.Height.Value);
-		}
-
 		return new Size(width, height);
 	}
 }

src/Comet/Layout/ZStackLayoutManager.cs

@@ -13,21 +13,7 @@ namespace Comet.Layout
 
 		ILayout layout;
 
-		public Size Measure(double wConstraint, double hConstraint) {
-
-			var v = layout as View;
-			var frameConstraints = v?.GetFrameConstraints();
-
-
-			var layoutVerticalSizing = layout.VerticalLayoutAlignment;
-			var layoutHorizontalSizing = layout.HorizontalLayoutAlignment;
-
-			double widthConstraint = frameConstraints?.Width > 0 ? frameConstraints.Width.Value : wConstraint;
-			double heightConstraint = frameConstraints?.Height > 0 ? frameConstraints.Height.Value : hConstraint;
-
-			var padding = layout.Padding;
-			widthConstraint -= padding.HorizontalThickness;
-			heightConstraint -= padding.VerticalThickness;
+		public Size Measure(double widthConstraint, double heightConstraint) {
 
 			Size measuredSize = new ();
 			foreach(var c in layout)
@@ -36,28 +22,17 @@ namespace Comet.Layout
 				measuredSize.Height = Math.Max(measuredSize.Height, s.Height);
 				measuredSize.Width = Math.Max(measuredSize.Width, s.Width);
 			};
-			measuredSize.Height += padding.VerticalThickness;
-			measuredSize.Width += padding.HorizontalThickness;
-
-			if (layoutVerticalSizing == LayoutAlignment.Fill && !double.IsInfinity(hConstraint))
-				measuredSize.Height = hConstraint;
-			if (layoutHorizontalSizing == LayoutAlignment.Fill && !double.IsInfinity(wConstraint))
-				measuredSize.Width = wConstraint;
-
-			if (frameConstraints?.Height > 0 && frameConstraints?.Width > 0)
-				return new Size(frameConstraints.Width.Value, frameConstraints.Height.Value);
 
 			return measuredSize;
 		}
 
 		public Size ArrangeChildren(Rectangle bounds)
 		{
-			var padding = layout.Padding;
-			var b = bounds.ApplyPadding(padding);
+			var b = bounds;
 			foreach (var v in layout)
 			{
 				if (v is View cv)
-					cv.SetFrameFromNativeView(b);
+					cv.LayoutSubviews(b);
 				else
 					v.Arrange(b);
 			}