ShrlAlgoToolkit/WPFDark/Caches.cs

using System.Collections.Generic;
using System.Windows.Input;
using System.Windows.Media;

using WPFDark.Internals;

namespace WPFDark
{
    public static class Caches
    {
        public static Pen GetPen(ByteColor color, double thickness)
        {
            var hashCode = HashCodeMaker.Make(color, thickness);

            if (_borderPens.TryGetValue(hashCode, out var p))
                return p;

            p = new Pen(GetSolidColorBrush(color), thickness);
            p.Freeze();

            _borderPens.Add(hashCode, p);

            return p;
        }

        public static Pen GetCapPen(ByteColor color, double thickness)
        {
            var hashCode = HashCodeMaker.Make(color, thickness);

            if (_capPens.TryGetValue(hashCode, out var p))
                return p;

            p = new Pen(GetSolidColorBrush(color), thickness)
            {
                StartLineCap = PenLineCap.Round,
                EndLineCap = PenLineCap.Round
            };
            p.Freeze();

            _capPens.Add(hashCode, p);

            return p;
        }

        public static Pen GetDashedPen(ByteColor color, double thickness)
        {
            var hashCode = HashCodeMaker.Make(color, thickness);

            if (_dashedPens.TryGetValue(hashCode, out var p))
                return p;

            p = new Pen(GetSolidColorBrush(color), thickness)
            {
                DashStyle = DashStyles.Dash
            };
            p.Freeze();

            _dashedPens.Add(hashCode, p);

            return p;
        }

        public static SolidColorBrush GetSolidColorBrush(ByteColor color)
        {
            var hashCode = HashCodeMaker.Make(color);

            if (_solidColorBrushes.TryGetValue(hashCode, out var b))
                return b;

            b = new SolidColorBrush(color.ToColor());
            b.Freeze();

            _solidColorBrushes.Add(hashCode, b);

            return b;
        }

        public static Geometry GetClipGeom(in LayoutRounder rounder, double w, double h, double cornerRadius, bool isWidthBorder)
        {
            var hashCode = HashCodeMaker.Make(w, h, cornerRadius, isWidthBorder);

            if (_clipGeoms.TryGetValue(hashCode, out var c))
                return c;

            if (isWidthBorder)
            {
                c = new RectangleGeometry
                {
                    RadiusX = cornerRadius,
                    RadiusY = cornerRadius,
                    Rect = rounder.RoundLayoutRect(
                        FrameworkElementExtensions.BorderWidth * 0.5,
                        FrameworkElementExtensions.BorderWidth * 0.5,
                        w - FrameworkElementExtensions.BorderWidth,
                        h - FrameworkElementExtensions.BorderWidth)
                };
            }
            else
            {
                c = new RectangleGeometry
                {
                    RadiusX = cornerRadius,
                    RadiusY = cornerRadius,
                    Rect = rounder.RoundLayoutRect(0, 0, w, h)
                };
            }

            c.Freeze();

            _clipGeoms.Add(hashCode, c);

            return c;
        }

        private static readonly Dictionary<long, RectangleGeometry> _clipGeoms = new Dictionary<long, RectangleGeometry>();

        private static readonly Dictionary<long, Pen> _borderPens = new Dictionary<long, Pen>();
        private static readonly Dictionary<long, Pen> _capPens = new Dictionary<long, Pen>();
        private static readonly Dictionary<long, Pen> _dashedPens = new Dictionary<long, Pen>();
        private static readonly Dictionary<long, SolidColorBrush> _solidColorBrushes = new Dictionary<long, SolidColorBrush>();

        public static TraversalRequest PreviousTraversalRequest
            => _PreviousTraversalRequest ??= new TraversalRequest(FocusNavigationDirection.Previous);

        public static TraversalRequest NextTraversalRequest
            => _NextTraversalRequest ??= new TraversalRequest(FocusNavigationDirection.Next);

        private static TraversalRequest? _PreviousTraversalRequest;
        private static TraversalRequest? _NextTraversalRequest;
    }
}