feat: restore legacy modal and drag behavior

tests/MBN_STOCK_WEBVIEW.LegacyWeb.Tests/LegacyInteractionMetricsNativeContractTests.cs

@@ -0,0 +1,137 @@
+namespace MBN_STOCK_WEBVIEW.LegacyWeb.Tests;
+
+public sealed class LegacyInteractionMetricsNativeContractTests
+{
+    private static readonly string RepositoryRoot = FindRepositoryRoot();
+    private static readonly string AppRoot = Path.Combine(
+        RepositoryRoot,
+        "src",
+        "MBN_STOCK_WEBVIEW.LegacyParityApp");
+    private static readonly string Window = File.ReadAllText(
+        Path.Combine(AppRoot, "MainWindow.xaml.cs"));
+
+    [Fact]
+    public void NativeWindowReadsBothWindowsDragThresholdsInCssDipCoordinates()
+    {
+        Assert.Contains("private const int SmCxDrag = 68;", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("private const int SmCyDrag = 69;", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("[DllImport(\"user32.dll\", ExactSpelling = true)]", Window,
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "GetSystemMetricsForDpi(\n" +
+            "                    SmCxDrag,\n" +
+            "                    LegacyInteractionMetrics.CssPixelsPerInch)",
+            Window.Replace("\r\n", "\n", StringComparison.Ordinal),
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "GetSystemMetricsForDpi(\n" +
+            "                    SmCyDrag,\n" +
+            "                    LegacyInteractionMetrics.CssPixelsPerInch)",
+            Window.Replace("\r\n", "\n", StringComparison.Ordinal),
+            StringComparison.Ordinal);
+        Assert.DoesNotContain("GetSystemMetrics(", Window, StringComparison.Ordinal);
+        Assert.Contains("LegacyInteractionMetrics.FromPixelsAtDpi(", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("logical DIP coordinate space used by XAML", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("Root.XamlRoot?.RasterizationScale", Window,
+            StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void NativeWindowRefreshesMetricsAfterRuntimeSettingsAndDpiChanges()
+    {
+        Assert.Contains("interactionMetrics: _interactionMetrics", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("private const uint WmSettingChange = 0x001A;", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("private const uint WmDisplayChange = 0x007E;", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("private const uint WmDpiChanged = 0x02E0;", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("AttachInteractionMetricsRefresh();", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("DetachInteractionMetricsRefresh();", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("SetWindowSubclass(", Window, StringComparison.Ordinal);
+        Assert.Contains("RemoveWindowSubclass(", Window, StringComparison.Ordinal);
+        Assert.Contains(
+            "message is WmSettingChange or WmDisplayChange or WmDpiChanged",
+            Window,
+            StringComparison.Ordinal);
+        Assert.Contains("QueueInteractionMetricsRefresh();", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("DispatcherQueuePriority.High", Window,
+            StringComparison.Ordinal);
+        Assert.True(
+            CountOccurrences(Window, "RefreshInteractionMetrics();") >= 3,
+            "Metrics must be refreshed at setup, runtime change, and state posting.");
+        Assert.DoesNotContain(
+            "private readonly LegacyInteractionMetrics _interactionMetrics",
+            Window,
+            StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public void NativeWindowDisablesFutureWebZoomAndFallsBackWithoutPrivateApis()
+    {
+        Assert.Contains(
+            "coreWebView.Settings.AreBrowserAcceleratorKeysEnabled = false;",
+            Window,
+            StringComparison.Ordinal);
+        Assert.Contains("coreWebView.Settings.IsZoomControlEnabled = false;", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("coreWebView.Settings.IsPinchZoomEnabled = false;", Window,
+            StringComparison.Ordinal);
+        Assert.DoesNotContain("CoreWebView2Controller.ZoomFactor", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("catch (DllNotFoundException)", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("catch (EntryPointNotFoundException)", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("catch (BadImageFormatException)", Window,
+            StringComparison.Ordinal);
+        Assert.Contains("catch (PlatformNotSupportedException)", Window,
+            StringComparison.Ordinal);
+        Assert.Equal(
+            4,
+            CountOccurrences(Window, "return CreateFallbackInteractionMetrics();"));
+        Assert.Contains(
+            "LegacyInteractionMetrics.Default with\n" +
+            "        {\n" +
+            "            HostRasterizationScale = ReadHostRasterizationScale()",
+            Window.Replace("\r\n", "\n", StringComparison.Ordinal),
+            StringComparison.Ordinal);
+    }
+
+    private static int CountOccurrences(string value, string search)
+    {
+        var count = 0;
+        var index = 0;
+        while ((index = value.IndexOf(search, index, StringComparison.Ordinal)) >= 0)
+        {
+            count++;
+            index += search.Length;
+        }
+
+        return count;
+    }
+
+    private static string FindRepositoryRoot()
+    {
+        var current = new DirectoryInfo(AppContext.BaseDirectory);
+        while (current is not null)
+        {
+            if (File.Exists(Path.Combine(current.FullName, "MBN_STOCK_WEBVIEW.sln")))
+            {
+                return current.FullName;
+            }
+
+            current = current.Parent;
+        }
+
+        throw new DirectoryNotFoundException("Repository root was not found.");
+    }
+}