RichTextLabel: BBCode, user text and effects

using Reckfell;

public partial class RichTextDemo : Control
{
    public RichTextLabel Info { get; private set; } = null!;
    public RichTextLabel Log { get; private set; } = null!;
    public Label Status { get; private set; } = null!;
    public int LinkCount { get; private set; }
    public BlueGlowEffect Effect { get; private set; } = null!;
    public override void _Ready()
    {
        UiSampleStyle.Prepare(this);
        var margin = new MarginContainer(); AddChild(margin); margin.SetAnchorsAndOffsetsPreset(LayoutPreset.FullRect, margin: 24);
        var column = new VBoxContainer(); margin.AddChild(column);
        Info = new RichTextLabel
        {
            BbcodeEnabled = true, FitContent = true, ScrollActive = false, Threaded = false,
            Text = "[url=docs]" + UiSampleStyle.Text("Документация", "Documentation") + "[/url]\n[b]Reckfell[/b]  [color=#668fff]C# UI[/color]",
            VisibleCharactersBehavior = TextServer.VisibleCharactersBehavior.CharsAfterShaping
        };
        column.AddChild(Info);
        Effect = new BlueGlowEffect(); Info.InstallEffect(Effect);
        Info.AppendText("\n[blueglow speed=2]" + UiSampleStyle.Text("Свой эффект", "Custom effect") + "[/blueglow]");
        var reveal = new HSlider { MinValue = 0, MaxValue = 1, Step = .01, Value = 1 }; column.AddChild(reveal);
        reveal.ValueChanged += value => SetReveal((float)value);
        Log = new RichTextLabel { BbcodeEnabled = true, SizeFlagsVertical = SizeFlags.ExpandFill, ScrollFollowing = true, Threaded = false }; column.AddChild(Log);
        Status = new Label { Text = UiSampleStyle.Text("Ссылка обрабатывается внутри примера", "The example handles its link locally") }; column.AddChild(Status);
        Info.MetaClicked += HandleMeta;
        AddName("[b]Player[/b]");
    }
    public void AddName(string text)
    {
        Log.PushColor(new Color(.4f, .6f, 1)); Log.AddText(UiSampleStyle.Text("Имя: ", "Name: ")); Log.Pop();
        Log.AddText(text); Log.Newline();
    }
    public void SetReveal(float ratio) { if (float.IsFinite(ratio)) Info.VisibleRatio = Mathf.Clamp(ratio, 0, 1); }
    private void HandleMeta(Variant data)
    {
        if (data.VariantType != Variant.Type.String || data.AsString() != "docs") return;
        LinkCount++; Status.Text = UiSampleStyle.Text("Выбрана документация", "Documentation selected");
    }
}

using Reckfell;

[Tool]
public partial class BlueGlowEffect : RichTextEffect
{
    [Export] public string bbcode { get; set; } = "blueglow";
    public int Calls { get; private set; }
    public override bool _ProcessCustomFX(CharFXTransform charFX)
    {
        Calls++;
        double speed = 2;
        if (charFX.Env.TryGetValue("speed", out Variant value) &&
            (value.VariantType == Variant.Type.Float || value.VariantType == Variant.Type.Int))
        {
            double requested = value.AsDouble();
            if (double.IsFinite(requested)) speed = System.Math.Clamp(requested, 0, 10);
        }
        Color color = charFX.Color;
        color.A *= (float)(.75 + .25 * System.Math.Cos(charFX.ElapsedTime * speed));
        color.R *= .5f; color.G *= .7f; charFX.Color = color;
        return true;
    }
}