XAML-Map-Control/MapControl/MapOverlay.WPF.cs

// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
// © 2017 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;

namespace MapControl
{
    public partial class MapOverlay
    {
        public static readonly DependencyProperty FontSizeProperty = Control.FontSizeProperty.AddOwner(
            typeof(MapOverlay));

        public static readonly DependencyProperty FontFamilyProperty = Control.FontFamilyProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).typeface = null));

        public static readonly DependencyProperty FontStyleProperty = Control.FontStyleProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).typeface = null));

        public static readonly DependencyProperty FontStretchProperty = Control.FontStretchProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).typeface = null));

        public static readonly DependencyProperty FontWeightProperty = Control.FontWeightProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).typeface = null));

        public static readonly DependencyProperty ForegroundProperty = Control.ForegroundProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => { if (o.GetValue(StrokeProperty) == null) ((MapOverlay)o).pen = null; }));

        public static readonly DependencyProperty StrokeProperty = Shape.StrokeProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeThicknessProperty = Shape.StrokeThicknessProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeDashArrayProperty = Shape.StrokeDashArrayProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeDashOffsetProperty = Shape.StrokeDashOffsetProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeDashCapProperty = Shape.StrokeDashCapProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeStartLineCapProperty = Shape.StrokeStartLineCapProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeEndLineCapProperty = Shape.StrokeEndLineCapProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeLineJoinProperty = Shape.StrokeLineJoinProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        public static readonly DependencyProperty StrokeMiterLimitProperty = Shape.StrokeMiterLimitProperty.AddOwner(
            typeof(MapOverlay), new FrameworkPropertyMetadata((o, e) => ((MapOverlay)o).pen = null));

        private Typeface typeface;
        private Pen pen;

        protected Typeface Typeface
        {
            get
            {
                if (typeface == null)
                {
                    typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
                }

                return typeface;
            }
        }

        protected Pen Pen
        {
            get
            {
                if (pen == null)
                {
                    pen = new Pen
                    {
                        Brush = Stroke ?? Foreground,
                        Thickness = StrokeThickness,
                        DashStyle = new DashStyle(StrokeDashArray, StrokeDashOffset),
                        DashCap = StrokeDashCap,
                        StartLineCap = StrokeStartLineCap,
                        EndLineCap = StrokeEndLineCap,
                        LineJoin = StrokeLineJoin,
                        MiterLimit = StrokeMiterLimit
                    };

                    pen.Freeze();
                }

                return pen;
            }
        }
    }
}