Web source: geometry-agnostic viewport==box model — viewport locked to element box, Stretch=Fill, no dead space

ytLive.Tests/WebView2ManagerTests.cs

@@ -20,29 +20,7 @@ public sealed class WebView2ManagerTests
     }
 
     [Fact]
-    public void WebView2_Control_Size_Is_Fixed_At_Canvas_Resolution()
-    {
-        _app.Run(() =>
-        {
-            var panel = new Canvas();
-            var source = new Source
-            {
-                Type = SourceType.WebSource,
-                Width = 640,
-                Height = 480,
-            };
-
-            using var manager = new WebView2Manager(panel, Dispatcher.CurrentDispatcher);
-            manager.Register(source);
-
-            var webView = panel.Children.OfType<WebView2>().First();
-            Assert.Equal(1920.0, webView.Width);
-            Assert.Equal(1080.0, webView.Height);
-        });
-    }
-
-    [Fact]
-    public void WebView2_Control_Size_Does_Not_Track_Source_Dimensions()
+    public void WebView2_Control_Size_Tracks_Source_Dimensions()
     {
         _app.Run(() =>
         {
@@ -58,12 +36,62 @@ public sealed class WebView2ManagerTests
             manager.Register(source);
 
             var webView = panel.Children.OfType<WebView2>().First();
+            Assert.Equal(640.0, webView.Width);
+            Assert.Equal(480.0, webView.Height);
 
             source.Width = 1024;
             source.Height = 768;
 
-            Assert.Equal(1920.0, webView.Width);
-            Assert.Equal(1080.0, webView.Height);
+            Assert.Equal(1024.0, webView.Width);
+            Assert.Equal(768.0, webView.Height);
+        });
+    }
+
+    [Fact]
+    public void WebView2_Control_Size_Ignores_Sub_One_Pixel_Drift()
+    {
+        _app.Run(() =>
+        {
+            var panel = new Canvas();
+            var source = new Source
+            {
+                Type = SourceType.WebSource,
+                Width = 640,
+                Height = 480,
+            };
+
+            using var manager = new WebView2Manager(panel, Dispatcher.CurrentDispatcher);
+            manager.Register(source);
+
+            var webView = panel.Children.OfType<WebView2>().First();
+
+            source.Width = 640.4;
+            Assert.Equal(640.0, webView.Width);
+
+            source.Height = 480.4;
+            Assert.Equal(480.0, webView.Height);
+        });
+    }
+
+    [Fact]
+    public void WebView2_Control_Size_Minimum_Is_One()
+    {
+        _app.Run(() =>
+        {
+            var panel = new Canvas();
+            var source = new Source
+            {
+                Type = SourceType.WebSource,
+                Width = 0,
+                Height = 0,
+            };
+
+            using var manager = new WebView2Manager(panel, Dispatcher.CurrentDispatcher);
+            manager.Register(source);
+
+            var webView = panel.Children.OfType<WebView2>().First();
+            Assert.Equal(1.0, webView.Width);
+            Assert.Equal(1.0, webView.Height);
         });
     }