Class ColorSelector

Source/Editor/GUI/Dialogs/ColorSelector.cs:13–278

Color selecting control.

    /// </summary>
    /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
    public class ColorSelector : ContainerControl
    {
        private const String GrayedOutParamName = "GrayedOut";

        /// <summary>
        /// Offset value applied to mouse cursor position when the user lets go of wheel or sliders.
        /// </summary>
        protected const float MouseCursorOffset = 6.0f;

        /// <summary>
        /// The color.
        /// </summary>
        protected Color _color;

        /// <summary>
        /// The wheel rectangle.
        /// </summary>
        protected Rectangle _wheelRect;

        private readonly MaterialBase _hsWheelMaterial;
        private bool _isMouseDownWheel;

        private Rectangle wheelDragRect
        {
            get
            {
                var hsv = _color.ToHSV();
                float hAngle = hsv.X * Mathf.DegreesToRadians;
                float hRadius = hsv.Y * _wheelRect.Width * 0.5f;
                var hsPos = new Float2(hRadius * Mathf.Cos(hAngle), -hRadius * Mathf.Sin(hAngle));
                float wheelBoxSize = IsSliding ? 9.0f : 5.0f;
                return new Rectangle(hsPos - (wheelBoxSize * 0.5f) + _wheelRect.Center, new Float2(wheelBoxSize));
            }
        }

        /// <summary>
        /// Occurs when selected color gets changed.
        /// </summary>
        public event Action<Color> ColorChanged;

        /// <summary>
        /// Gets or sets the color.
        /// </summary>
        public Color Color
        {
            get => _color;
            set
            {
                if (_color != value)
                {
                    _color = value;
                    ColorChanged?.Invoke(_color);
                }
            }
        }

        /// <summary>
        /// Gets a value indicating whether user is using a wheel.