Свой Control: рисунок, мышь и клавиатура

using Reckfell;

public partial class MeterControl : Control
{
    [Signal] public delegate void ValueChangedEventHandler(float value);
    private float _value = .25f;
    private bool _dragging;
    [Export(PropertyHint.Range, "0,1,0.01")]
    public float Value
    {
        get => _value;
        set
        {
            if (!float.IsFinite(value)) return;
            float next = Mathf.Clamp(value, 0, 1);
            if (Mathf.IsEqualApprox(next, _value)) return;
            _value = next; QueueRedraw(); EmitSignal(SignalName.ValueChanged, next);
        }
    }

    public override Vector2 _GetMinimumSize() => new(160, 40);

    public override void _Ready()
    {
        FocusMode = FocusModeEnum.All; MouseFilter = MouseFilterEnum.Stop;
        FocusEntered += QueueRedraw;
        FocusExited += () => { _dragging = false; QueueRedraw(); };
        Resized += QueueRedraw;
        VisibilityChanged += () => { if (!IsVisibleInTree()) _dragging = false; };
    }

    public override void _Draw()
    {
        DrawRect(new Rect2(0, 10, Size.X, 20), new Color(.16f, .16f, .18f));
        DrawRect(new Rect2(0, 10, Size.X * _value, 20), new Color(.15f, .35f, 1));
        if (HasFocus()) DrawRect(new Rect2(Vector2.Zero, Size), Colors.White, false, 2);
    }

    public override void _GuiInput(InputEvent @event)
    {
        if (@event is InputEventMouseButton click && click.ButtonIndex == MouseButton.Left)
        {
            _dragging = click.Pressed;
            if (click.Pressed) { GrabFocus(); Value = click.Position.X / Mathf.Max(1, Size.X); }
            AcceptEvent();
        }
        else if (@event is InputEventMouseMotion motion && _dragging)
        {
            Value = motion.Position.X / Mathf.Max(1, Size.X); AcceptEvent();
        }
        else if (@event.IsActionPressed("ui_left", true)) { Value -= .05f; AcceptEvent(); }
        else if (@event.IsActionPressed("ui_right", true)) { Value += .05f; AcceptEvent(); }
    }
}

using Reckfell;

public partial class MeterDemo : Control
{
    public MeterControl Meter { get; private set; } = null!;
    public Label Status { 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);
        column.AddChild(new Label { Text = UiSampleStyle.Text("Мышь или стрелки ← →", "Mouse or arrow keys") });
        Meter = new MeterControl { Name = "Meter", SizeFlagsHorizontal = SizeFlags.ExpandFill }; column.AddChild(Meter);
        Status = new Label(); column.AddChild(Status); UpdateLabel(Meter.Value);
        Meter.ValueChanged += UpdateLabel;
        Callable.From(() => Meter.GrabFocus()).CallDeferred();
    }
    private void UpdateLabel(float value) => Status.Text = $"{value:P0}";
}