New controls, main view

src/Library/TerminalUI/Controls/StackPanel.cs

@@ -0,0 +1,54 @@
+using System.Collections.ObjectModel;
+using PropertyChanged.SourceGenerator;
+using TerminalUI.Models;
+
+namespace TerminalUI.Controls;
+
+public partial class StackPanel<T> : ChildContainerView<T>
+{
+    private readonly Dictionary<IView, Size> _requestedSizes = new();
+    [Notify] private Orientation _orientation = Orientation.Vertical;
+
+    public override Size GetRequestedSize()
+    {
+        _requestedSizes.Clear();
+        var width = 0;
+        var height = 0;
+
+        foreach (var child in Children)
+        {
+            var childSize = child.GetRequestedSize();
+            _requestedSizes.Add(child, childSize);
+
+            if (Orientation == Orientation.Vertical)
+            {
+                width = Math.Max(width, childSize.Width);
+                height += childSize.Height;
+            }
+            else
+            {
+                width += childSize.Width;
+                height = Math.Max(height, childSize.Height);
+            }
+        }
+
+        return new Size(width, height);
+    }
+
+    protected override void DefaultRenderer(Position position, Size size)
+    {
+        var delta = 0;
+        foreach (var child in Children)
+        {
+            if (!_requestedSizes.TryGetValue(child, out var childSize)) throw new Exception("Child size not found");
+            var childPosition = Orientation == Orientation.Vertical
+                ? position with {Y = position.Y + delta}
+                : position with {X = position.X + delta};
+            child.Render(childPosition, childSize);
+
+            delta += Orientation == Orientation.Vertical
+                ? childSize.Height
+                : childSize.Width;
+        }
+    }
+}