gui-cs.Terminal.Gui/UnitTests/View/Layout/AbsoluteLayoutTests.cs

using Xunit;
using Xunit.Abstractions;

//using GraphViewTests = Terminal.Gui.Views.GraphViewTests;

// Alias Console to MockConsole so we don't accidentally use Console

namespace Terminal.Gui.ViewTests;

public class AbsoluteLayoutTests {
	readonly ITestOutputHelper _output;

	public AbsoluteLayoutTests (ITestOutputHelper output) => _output = output;

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Constructor ()
	{
		var v = new View ();
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		v.Dispose ();

		var frame = Rect.Empty;
		v = new View (frame);
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (frame, v.Frame);
		Assert.Equal (new Rect (0, 0, frame.Width, frame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (0), v.X);
		Assert.Equal (Pos.At (0), v.Y);
		Assert.Equal (Dim.Sized (0), v.Width);
		Assert.Equal (Dim.Sized (0), v.Height);
		v.Dispose ();

		frame = new Rect (1, 2, 3, 4);
		v = new View (frame);
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (frame, v.Frame);
		Assert.Equal (new Rect (0, 0, frame.Width, frame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (3), v.Width);
		Assert.Equal (Dim.Sized (4), v.Height);
		v.Dispose ();

		v = new View (frame, "v");
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (frame, v.Frame);
		Assert.Equal (new Rect (0, 0, frame.Width, frame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (3), v.Width);
		Assert.Equal (Dim.Sized (4), v.Height);
		v.Dispose ();

		v = new View (frame.X, frame.Y, "v");
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		// BUGBUG: v2 - I think the default size should be 0,0 not 1,1
		Assert.Equal (new Rect (frame.X, frame.Y, 1, 1), v.Frame);
		Assert.Equal (new Rect (0, 0, 1, 1), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (1), v.Width);
		Assert.Equal (Dim.Sized (1), v.Height);
		v.Dispose ();

		v = new View ();
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (new Rect (0, 0, 0, 0), v.Frame);
		Assert.Equal (new Rect (0, 0, 0, 0), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (0), v.X);
		Assert.Equal (Pos.At (0), v.Y);
		Assert.Equal (Dim.Sized (0), v.Width);
		Assert.Equal (Dim.Sized (0), v.Height);
		v.Dispose ();

		v = new View {
			X = frame.X,
			Y = frame.Y,
			Width = frame.Width,
			Height = frame.Height
		};
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (new Rect (frame.X, frame.Y, 3, 4), v.Frame);
		Assert.Equal (new Rect (0, 0, 3, 4), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (3), v.Width);
		Assert.Equal (Dim.Sized (4), v.Height);
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Change_Frame ()
	{
		var frame = new Rect (1, 2, 3, 4);
		var newFrame = new Rect (1, 2, 30, 40);

		var v = new View ();
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		v.Dispose ();

		v = new View (frame);
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);

		v.Frame = newFrame;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newFrame, v.Frame);
		Assert.Equal (new Rect (0, 0, newFrame.Width, newFrame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (30), v.Width);
		Assert.Equal (Dim.Sized (40), v.Height);
		v.Dispose ();

		v = new View (frame.X, frame.Y, "v");
		v.Frame = newFrame;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newFrame, v.Frame);
		Assert.Equal (new Rect (0, 0, newFrame.Width, newFrame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (30), v.Width);
		Assert.Equal (Dim.Sized (40), v.Height);
		v.Dispose ();

		newFrame = new Rect (10, 20, 30, 40);
		v = new View (frame);
		v.Frame = newFrame;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newFrame, v.Frame);
		Assert.Equal (new Rect (0, 0, newFrame.Width, newFrame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (10), v.X);
		Assert.Equal (Pos.At (20), v.Y);
		Assert.Equal (Dim.Sized (30), v.Width);
		Assert.Equal (Dim.Sized (40), v.Height);
		v.Dispose ();

		v = new View (frame.X, frame.Y, "v");
		v.Frame = newFrame;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newFrame, v.Frame);
		Assert.Equal (new Rect (0, 0, newFrame.Width, newFrame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (10), v.X);
		Assert.Equal (Pos.At (20), v.Y);
		Assert.Equal (Dim.Sized (30), v.Width);
		Assert.Equal (Dim.Sized (40), v.Height);
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Change_Height_or_Width_Absolute ()
	{
		var frame = new Rect (1, 2, 3, 4);
		var newFrame = new Rect (1, 2, 30, 40);

		var v = new View (frame);
		v.Height = newFrame.Height;
		v.Width = newFrame.Width;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newFrame, v.Frame);
		Assert.Equal (new Rect (0, 0, newFrame.Width, newFrame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal ($"Absolute({newFrame.Height})", v.Height.ToString ());
		Assert.Equal ($"Absolute({newFrame.Width})", v.Width.ToString ());
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Change_Height_or_Width_MakesComputed ()
	{
		var v = new View (Rect.Empty);
		v.Height = Dim.Fill ();
		v.Width = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Change_X_or_Y_Absolute ()
	{
		var frame = new Rect (1, 2, 3, 4);
		var newFrame = new Rect (10, 20, 3, 4);

		var v = new View (frame);
		v.X = newFrame.X;
		v.Y = newFrame.Y;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newFrame, v.Frame);
		Assert.Equal (new Rect (0, 0, newFrame.Width, newFrame.Height), v.Bounds); // With Absolute Bounds *is* deterministic before Layout
		Assert.Equal ($"Absolute({newFrame.X})", v.X.ToString ());
		Assert.Equal ($"Absolute({newFrame.Y})", v.Y.ToString ());
		Assert.Equal (Dim.Sized (3), v.Width);
		Assert.Equal (Dim.Sized (4), v.Height);
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Change_X_or_Y_MakesComputed ()
	{
		var v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_Change_X_Y_Height_Width_Absolute ()
	{
		var v = new View (Rect.Empty);
		v.X = 1;
		v.Y = 2;
		v.Height = 3;
		v.Width = 4;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		v.Dispose ();

		v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		v.Width = Dim.Fill ();
		v.Height = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();

		v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		v.Width = Dim.Fill ();
		v.Height = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);

		v.X = 1;
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();

		v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		v.Width = Dim.Fill ();
		v.Height = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);

		v.Y = 2;
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();

		v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		v.Width = Dim.Fill ();
		v.Height = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);

		v.Width = 3;
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();

		v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		v.Width = Dim.Fill ();
		v.Height = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);

		v.Height = 3;
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);
		v.Dispose ();

		v = new View (Rect.Empty);
		v.X = Pos.Center ();
		v.Y = Pos.Center ();
		v.Width = Dim.Fill ();
		v.Height = Dim.Fill ();
		Assert.True (v.LayoutStyle == LayoutStyle.Computed);

		v.X = 1;
		v.Y = 2;
		v.Height = 3;
		v.Width = 4;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		v.Dispose ();
	}

	[Fact]
	[TestRespondersDisposed]
	public void AbsoluteLayout_LayoutSubviews ()
	{
		var superRect = new Rect (0, 0, 100, 100);
		var super = new View (superRect, "super");
		Assert.True (super.LayoutStyle == LayoutStyle.Absolute);
		var v1 = new View {
			X = 0,
			Y = 0,
			Width = 10,
			Height = 10
		};
		Assert.True (v1.LayoutStyle == LayoutStyle.Absolute);

		var v2 = new View {
			X = 10,
			Y = 10,
			Width = 10,
			Height = 10
		};
		Assert.True (v2.LayoutStyle == LayoutStyle.Absolute);

		super.Add (v1, v2);
		Assert.True (v1.LayoutStyle == LayoutStyle.Absolute);
		Assert.True (v2.LayoutStyle == LayoutStyle.Absolute);

		super.LayoutSubviews ();
		Assert.Equal (new Rect (0, 0, 10, 10), v1.Frame);
		Assert.Equal (new Rect (10, 10, 10, 10), v2.Frame);
		super.Dispose ();
	}

	[Fact]
	public void AbsoluteLayout_Setting_Bounds_Location_NotEmpty ()
	{
		// TODO: Should we enforce Bounds.X/Y == 0? The code currently ignores value.X/Y which is
		// TODO: correct behavior, but is silent. Perhaps an exception?
		var frame = new Rect (1, 2, 3, 4);
		var newBounds = new Rect (10, 20, 30, 40);
		var view = new View (frame);
		view.Bounds = newBounds;
		Assert.Equal (new Rect (0, 0, 30, 40), view.Bounds);
		Assert.Equal (new Rect (1, 2, 30, 40), view.Frame);
	}

	[Fact]
	public void AbsoluteLayout_Setting_Bounds_Sets_Frame ()
	{
		var frame = new Rect (1, 2, 3, 4);
		var newBounds = new Rect (0, 0, 30, 40);

		var v = new View (frame);
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);

		v.Bounds = newBounds;
		Assert.True (v.LayoutStyle == LayoutStyle.Absolute);
		Assert.Equal (newBounds, v.Bounds);
		Assert.Equal (new Rect (1, 2, newBounds.Width, newBounds.Height), v.Frame);
		Assert.Equal (new Rect (0, 0, newBounds.Width, newBounds.Height), v.Bounds);
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (30), v.Width);
		Assert.Equal (Dim.Sized (40), v.Height);

		newBounds = new Rect (0, 0, 3, 4);
		v.Bounds = newBounds;
		Assert.Equal (newBounds, v.Bounds);
		Assert.Equal (new Rect (1, 2, newBounds.Width, newBounds.Height), v.Frame);
		Assert.Equal (new Rect (0, 0, newBounds.Width, newBounds.Height), v.Bounds);
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (3), v.Width);
		Assert.Equal (Dim.Sized (4), v.Height);

		v.BorderStyle = LineStyle.Single;
		// Bounds should shrink
		Assert.Equal (new Rect (0, 0, 1, 2), v.Bounds);
		// Frame should not change
		Assert.Equal (new Rect (1, 2, 3, 4), v.Frame);
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (3), v.Width);
		Assert.Equal (Dim.Sized (4), v.Height);

		// Now set bounds bigger as before
		newBounds = new Rect (0, 0, 3, 4);
		v.Bounds = newBounds;
		Assert.Equal (newBounds, v.Bounds);
		// Frame grows because there's now a border
		Assert.Equal (new Rect (1, 2, 5, 6), v.Frame);
		Assert.Equal (new Rect (0, 0, newBounds.Width, newBounds.Height), v.Bounds);
		Assert.Equal (Pos.At (1), v.X);
		Assert.Equal (Pos.At (2), v.Y);
		Assert.Equal (Dim.Sized (5), v.Width);
		Assert.Equal (Dim.Sized (6), v.Height);
	}
}