From 0537ccf2fe9fd74ef5e93cd6a567b44cd094985e Mon Sep 17 00:00:00 2001
From: "Frank A. Krueger" <fak@praeclarum.org>
Date: Mon, 19 Jun 2017 21:55:20 -0700
Subject: [PATCH] Add properties to Context2D

---
 Ooui/Canvas.cs                   |  2 +-
 Ooui/CanvasRenderingContext2D.cs | 80 ++++++++++++++++++++++++++++++++
 Ooui/EventTarget.cs              |  5 ++
 Tests/CanvasTests.cs             |  6 +--
 4 files changed, 89 insertions(+), 4 deletions(-)

diff --git a/Ooui/Canvas.cs b/Ooui/Canvas.cs
index b66aab1..28906ca 100644
--- a/Ooui/Canvas.cs
+++ b/Ooui/Canvas.cs
@@ -24,7 +24,7 @@ namespace Ooui
         {
         }
 
-        public Context2d GetContext2d ()
+        public CanvasRenderingContext2D GetContext2D ()
         {
             if (System.Threading.Interlocked.CompareExchange (ref gotContext2d, 1, 0) == 0) {
                 var mcall = Message.Call (Id, "getContext", "2d");
diff --git a/Ooui/CanvasRenderingContext2D.cs b/Ooui/CanvasRenderingContext2D.cs
index a0bcd93..f7723fe 100644
--- a/Ooui/CanvasRenderingContext2D.cs
+++ b/Ooui/CanvasRenderingContext2D.cs
@@ -2,9 +2,89 @@ namespace Ooui
 {
     public class CanvasRenderingContext2D : EventTarget
     {
+        object fillStyle = "#000";
+        public object FillStyle {
+            get => fillStyle;
+            set => SetProperty (ref fillStyle, value, "fillStyle");
+        }
+
+        double fontSize = 10;
+        public double FontSize {
+            get => fontSize;
+            set {
+                if (fontSize != value) {
+                    fontSize = value;
+                    SetProperty (ref font, GetFont (), "font", "Font");
+                    OnPropertyChanged ("FontSize");
+                }
+            }
+        }
+        string fontFamily = "sans-serif";
+        public string FontFamily {
+            get => fontFamily;
+            set {
+                if (fontFamily != value) {
+                    fontFamily = value ?? "sans-serif";
+                    SetProperty (ref font, GetFont (), "font", "Font");
+                    OnPropertyChanged ("FontFamily");
+                }
+            }
+        }
+        string font = "10px sans-serif";
+        public string Font => font;
+        string GetFont ()
+        {
+            var size = FontSize.ToString (System.Globalization.CultureInfo.InvariantCulture);
+            return $"{size}px {FontFamily}";
+        }
+
+        double globalAlpha = 1;
+        public double GlobalAlpha {
+            get => globalAlpha;
+            set => SetProperty (ref globalAlpha, value, "globalAlpha");
+        }
+
+        LineCap lineCap = LineCap.Butt;
+        public LineCap LineCap {
+            get => lineCap;
+            set => SetProperty (ref lineCap, value, "lineCap");
+        }
+
+        LineJoin lineJoin = LineJoin.Miter;
+        public LineJoin LineJoin {
+            get => lineJoin;
+            set => SetProperty (ref lineJoin, value, "lineJoin");
+        }
+
+        double lineWidth = 1;
+        public double LineWidth {
+            get => lineWidth;
+            set => SetProperty (ref lineWidth, value, "lineWidth");
+        }
+
+        object strokeStyle = "#000";
+        public object StrokeStyle {
+            get => strokeStyle;
+            set => SetProperty (ref strokeStyle, value, "strokeStyle");
+        }
+
         public CanvasRenderingContext2D ()
             : base ("#canvasRenderingContext2D")
         {
         }
     }
+
+    public enum LineCap
+    {
+        Butt,
+        Round,
+        Square
+    }
+
+    public enum LineJoin
+    {
+        Bevel,
+        Round,
+        Miter
+    }
 }
diff --git a/Ooui/EventTarget.cs b/Ooui/EventTarget.cs
index ae366c7..30c855e 100644
--- a/Ooui/EventTarget.cs
+++ b/Ooui/EventTarget.cs
@@ -89,9 +89,14 @@ namespace Ooui
                 return false;
             backingStore = newValue;
             SendSet (attributeName, newValue);
+            OnPropertyChanged (propertyName);
             return true;
         }
 
+        protected virtual void OnPropertyChanged (string propertyName)
+        {
+        }
+
         public const char IdPrefix = '\u2999';
 
         static long idCounter = 0;
diff --git a/Tests/CanvasTests.cs b/Tests/CanvasTests.cs
index d8eed6b..b181741 100644
--- a/Tests/CanvasTests.cs
+++ b/Tests/CanvasTests.cs
@@ -9,13 +9,13 @@ namespace Tests
     public class CanvasTests
     {
         [TestMethod]
-        public void Context2dState ()
+        public void Context2DState ()
         {
             var c = new Canvas ();
             Assert.AreEqual (1, c.StateMessages.Count);
-            var c2d = c.GetContext2d ();
+            var c2d = c.GetContext2D ();
             Assert.AreEqual (2, c.StateMessages.Count);
-            var c2d2 = c.GetContext2d ();
+            var c2d2 = c.GetContext2D ();
             Assert.AreEqual (2, c.StateMessages.Count);
             Assert.AreEqual (c2d, c2d2);
         }