ifsrenderer-linux / AvaloniaShell.Tests / SliderMetricTests.cs

using System.Linq;

using Avalonia;
using Avalonia.Controls;
using Avalonia.Headless.XUnit;
using Avalonia.Media;
using Avalonia.Threading;
using Avalonia.VisualTree;

using IFSRenderer.AvaloniaShell.Controls;

using Xunit;

namespace IFSRenderer.AvaloniaShell.Tests;

/// <summary>
/// The background colour control: "the background RGB sliders are too large", and separately
/// "those sliders are still normal sliders??".
/// </summary>
/// <remarks>
/// Both complaints had the same root: three stock 0-255 Sliders that the canonical does not have
/// at all. MainWindow.xaml:171 is an xctk:ColorPicker — a swatch that opens a picker. The
/// read-outs beside our sliders were one-way StringFormat, so an exact colour could not be
/// entered by any means.
/// </remarks>
public class BackgroundColourTests
{
    private static MainWindow Ready()
    {
        (MainWindow window, _) = MainWindowHarness.Start();
        window.Measure(new Size(1500, 900));
        window.Arrange(new Rect(0, 0, 1500, 900));
        Dispatcher.UIThread.RunJobs();
        return window;
    }

    /// <summary>
    /// The whole app should contain no stock Slider. The canonical has exactly two, both inside
    /// PaletteSlider.xaml and fully retemplated into a gradient bar.
    /// </summary>
    [AvaloniaFact]
    public void No_stock_sliders_remain_in_the_main_window()
    {
        MainWindow window = Ready();

        var stock = window.GetVisualDescendants().OfType<Slider>().ToList();
        Assert.True(stock.Count == 0,
            $"{stock.Count} stock Slider(s) in the window; the canonical has none outside "
            + "PaletteSlider.xaml. Use ValueSlider.");
    }

    /// <summary>An exact colour must be reachable — the capability the sliders never had.</summary>
    [AvaloniaFact]
    public void A_hex_colour_can_be_typed_and_reaches_the_fractal()
    {
        (MainWindow window, Fakes.FakeRenderQueue queue) = MainWindowHarness.Start();
        Dispatcher.UIThread.RunJobs();

        var hex = window.FindControl<TextBox>("BgHex");
        Assert.NotNull(hex);

        hex.Text = "#102030";
        Dispatcher.UIThread.RunJobs();
        MainWindowHarness.Settle(queue);

        Assert.Equal(0x10, queue.Current.BackgroundColor.R);
        Assert.Equal(0x20, queue.Current.BackgroundColor.G);
        Assert.Equal(0x30, queue.Current.BackgroundColor.B);
    }

    /// <summary>Dragging a channel writes back to the hex box, so the two never disagree.</summary>
    [AvaloniaFact]
    public void Channel_edits_are_reflected_in_the_hex_box()
    {
        (MainWindow window, Fakes.FakeRenderQueue queue) = MainWindowHarness.Start();
        Dispatcher.UIThread.RunJobs();

        var hex = window.FindControl<TextBox>("BgHex");
        var red = window.FindControl<ValueSlider>("BgR");
        Assert.NotNull(red);

        hex.Text = "#000000";
        Dispatcher.UIThread.RunJobs();

        MainWindowHarness.Click(red, "UpButton");
        MainWindowHarness.Settle(queue);

        Assert.Equal("#010000", hex.Text);
        Assert.Equal(1, queue.Current.BackgroundColor.R);
    }
}