Console upgrades, PossibleCommands VM

src/Library/TerminalUI/Models/Margin.cs

@@ -0,0 +1,18 @@
+namespace TerminalUI.Models;
+
+public record Margin(int Left, int Top, int Right, int Bottom)
+{
+    public static implicit operator Margin(int value) => new(value, value, value, value);
+    public static implicit operator Margin((int Left, int Top, int Right, int Bottom) value) => new(value.Left, value.Top, value.Right, value.Bottom);
+    public static implicit operator Margin(string s)
+    {
+        var parts = s.Split(' ');
+        return parts.Length switch
+        {
+            1 => new Margin(int.Parse(parts[0])),
+            2 => new Margin(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[0]), int.Parse(parts[1])),
+            4 => new Margin(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]), int.Parse(parts[3])),
+            _ => throw new ArgumentException("Invalid margin format", nameof(s))
+        };
+    }
+}

src/Library/TerminalUI/Models/RenderContext.cs

@@ -0,0 +1,18 @@
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.Models;
+
+public readonly ref struct RenderContext
+{
+    private static int _renderId = 0;
+    public readonly int RenderId;
+    public readonly IConsoleDriver ConsoleDriver;
+
+    public RenderContext(IConsoleDriver consoleDriver)
+    {
+        ConsoleDriver = consoleDriver;
+        RenderId = _renderId++;
+    }
+    
+    public static RenderContext Empty => new(null!);
+}

src/Library/TerminalUI/Models/Size.cs

@@ -1,3 +1,3 @@
 namespace TerminalUI.Models;
 
-public record struct Size(int Width, int Height);
+public readonly record struct Size(int Width, int Height);