[web] No implicit view in multi-view mode

lib/web_ui/lib/src/engine/canvas_pool.dart

@@ -26,7 +26,6 @@ import 'safe_browser_api.dart';
 import 'shadow.dart';
 import 'util.dart';
 import 'vector_math.dart';
-import 'window.dart';
 
 /// Renders picture to a CanvasElement by allocating and caching 0 or more
 /// canvas(s) for [BitmapCanvas].
@@ -1039,7 +1038,7 @@ class ContextStateHandle {
         //
         // transformedShadowDelta = M*shadowDelta - M*origin.
         final Float32List tempVector = Float32List(2);
-        tempVector[0] = kOutsideTheBoundsOffset * window.devicePixelRatio;
+        tempVector[0] = kOutsideTheBoundsOffset * EngineFlutterDisplay.instance.devicePixelRatio;
         _canvasPool.currentTransform.transform2(tempVector);
         final double shadowOffsetX = tempVector[0];
         final double shadowOffsetY = tempVector[1];

lib/web_ui/lib/src/engine/canvaskit/canvas.dart

@@ -8,6 +8,7 @@ import 'dart:typed_data';
 import 'package:ui/ui.dart' as ui;
 
 import '../color_filter.dart';
+import '../display.dart';
 import 'canvaskit_api.dart';
 import 'color_filter.dart';
 import 'image.dart';
@@ -248,7 +249,7 @@ class CkCanvas {
   void drawShadow(
       CkPath path, ui.Color color, double elevation, bool transparentOccluder) {
     drawSkShadow(skCanvas, path, color, elevation, transparentOccluder,
-        ui.window.devicePixelRatio);
+        EngineFlutterDisplay.instance.devicePixelRatio);
   }
 
   void drawVertices(

lib/web_ui/lib/src/engine/canvaskit/embedded_views.dart

@@ -5,13 +5,13 @@
 import 'package:ui/ui.dart' as ui;
 
 import '../../engine.dart' show PlatformViewManager;
+import '../display.dart';
 import '../dom.dart';
 import '../html/path_to_svg_clip.dart';
 import '../platform_views/slots.dart';
 import '../svg.dart';
 import '../util.dart';
 import '../vector_math.dart';
-import '../window.dart';
 import 'canvas.dart';
 import 'embedded_views_diff.dart';
 import 'path.dart';
@@ -68,7 +68,7 @@ class HtmlViewEmbedder {
   List<OverlayGroup> _activeOverlayGroups = <OverlayGroup>[];
 
   /// The size of the frame, in physical pixels.
-  ui.Size _frameSize = ui.window.physicalSize;
+  late ui.Size _frameSize;
 
   set frameSize(ui.Size size) {
     _frameSize = size;
@@ -326,7 +326,7 @@ class HtmlViewEmbedder {
     //
     // HTML elements use logical (CSS) pixels, but we have been using physical
     // pixels, so scale down the head element to match the logical resolution.
-    final double scale = window.devicePixelRatio;
+    final double scale = EngineFlutterDisplay.instance.devicePixelRatio;
     final double inverseScale = 1 / scale;
     final Matrix4 scaleMatrix =
         Matrix4.diagonal3Values(inverseScale, inverseScale, 1);

lib/web_ui/lib/src/engine/canvaskit/layer_tree.dart

@@ -21,9 +21,6 @@ class LayerTree {
   /// The root of the layer tree.
   final RootLayer rootLayer;
 
-  /// The size (in physical pixels) of the frame to paint this layer tree into.
-  final ui.Size frameSize = ui.window.physicalSize;
-
   /// The devicePixelRatio of the frame to paint this layer tree into.
   double? devicePixelRatio;
 

lib/web_ui/lib/src/engine/canvaskit/rasterizer.dart

@@ -7,9 +7,10 @@ import 'package:ui/ui.dart' as ui;
 
 /// A class that can rasterize [LayerTree]s into a given `sceneHost` element.
 class Rasterizer {
-  Rasterizer(this.sceneHost);
+  Rasterizer(this.view);
 
-  final DomElement sceneHost;
+  final EngineFlutterView view;
+  DomElement get sceneHost => view.dom.sceneHost;
   final CompositorContext context = CompositorContext();
   final RenderCanvasFactory renderCanvasFactory = RenderCanvasFactory();
   late final HtmlViewEmbedder viewEmbedder =
@@ -30,12 +31,13 @@ class Rasterizer {
   /// Creates a new frame from this rasterizer's surface, draws the given
   /// [LayerTree] into it, and then submits the frame.
   void draw(LayerTree layerTree) {
-    if (layerTree.frameSize.isEmpty) {
+    final ui.Size frameSize = view.physicalSize;
+    if (frameSize.isEmpty) {
       // Available drawing area is empty. Skip drawing.
       return;
     }
 
-    _currentFrameSize = layerTree.frameSize;
+    _currentFrameSize = frameSize;
     CanvasKitRenderer.instance.offscreenSurface.acquireFrame(_currentFrameSize);
     viewEmbedder.frameSize = _currentFrameSize;
     final CkPictureRecorder pictureRecorder = CkPictureRecorder();

lib/web_ui/lib/src/engine/canvaskit/render_canvas.dart

@@ -6,8 +6,8 @@ import 'dart:js_interop';
 
 import 'package:ui/ui.dart' as ui;
 
+import '../display.dart';
 import '../dom.dart';
-import '../window.dart';
 
 /// A visible (on-screen) canvas that can display bitmaps produced by CanvasKit
 /// in the (off-screen) SkSurface which is backed by an OffscreenCanvas.
@@ -68,12 +68,13 @@ class RenderCanvas {
   /// match the size of the window precisely we use the most precise floating
   /// point value we can get.
   void _updateLogicalHtmlCanvasSize() {
-    final double logicalWidth = _pixelWidth / window.devicePixelRatio;
-    final double logicalHeight = _pixelHeight / window.devicePixelRatio;
+    final double devicePixelRatio = EngineFlutterDisplay.instance.devicePixelRatio;
+    final double logicalWidth = _pixelWidth / devicePixelRatio;
+    final double logicalHeight = _pixelHeight / devicePixelRatio;
     final DomCSSStyleDeclaration style = canvasElement.style;
     style.width = '${logicalWidth}px';
     style.height = '${logicalHeight}px';
-    _currentDevicePixelRatio = window.devicePixelRatio;
+    _currentDevicePixelRatio = devicePixelRatio;
   }
 
   /// Render the given [bitmap] with this [RenderCanvas].
@@ -112,7 +113,7 @@ class RenderCanvas {
         size.height.ceil() == _pixelHeight) {
       // The existing canvas doesn't need to be resized (unless the device pixel
       // ratio changed).
-      if (window.devicePixelRatio != _currentDevicePixelRatio) {
+      if (EngineFlutterDisplay.instance.devicePixelRatio != _currentDevicePixelRatio) {
         _updateLogicalHtmlCanvasSize();
       }
       return;

lib/web_ui/lib/src/engine/canvaskit/renderer.dart

@@ -400,7 +400,7 @@ class CanvasKitRenderer implements Renderer {
 
   Rasterizer _getRasterizerForView(EngineFlutterView view) {
     return _rasterizers.putIfAbsent(view, () {
-      return Rasterizer(view.dom.sceneHost);
+      return Rasterizer(view);
     });
   }
 

lib/web_ui/lib/src/engine/html/bitmap_canvas.dart

@@ -17,7 +17,6 @@ import '../html_image_codec.dart';
 import '../text/canvas_paragraph.dart';
 import '../util.dart';
 import '../vector_math.dart';
-import '../window.dart';
 import 'clip.dart';
 import 'color_filter.dart';
 import 'dom_canvas.dart';
@@ -1036,7 +1035,7 @@ class BitmapCanvas extends EngineCanvas {
     _drawPointsPaint.color = paint.color;
     _drawPointsPaint.maskFilter = paint.maskFilter;
 
-    final double dpr = ui.window.devicePixelRatio;
+    final double dpr = EngineFlutterDisplay.instance.devicePixelRatio;
     // Use hairline (device pixel when strokeWidth is not specified).
     final double strokeWidth =
         paint.strokeWidth == null ? 1.0 / dpr : paint.strokeWidth!;
@@ -1077,7 +1076,7 @@ class BitmapCanvas extends EngineCanvas {
   /// viewport.
   ui.Rect _computeScreenBounds(Matrix4 targetTransform) {
     final Matrix4 inverted = targetTransform.clone()..invert();
-    final double dpr = ui.window.devicePixelRatio;
+    final double dpr = EngineFlutterDisplay.instance.devicePixelRatio;
     final double width = ui.window.physicalSize.width * dpr;
     final double height = ui.window.physicalSize.height * dpr;
     final Vector3 topLeft = inverted.perspectiveTransform(x: 0, y: 0, z: 0);
@@ -1457,7 +1456,7 @@ String maskFilterToCanvasFilter(ui.MaskFilter? maskFilter) {
   if (maskFilter != null) {
     // Multiply by device-pixel ratio because the canvas' pixel width and height
     // are larger than its CSS width and height by device-pixel ratio.
-    return 'blur(${maskFilter.webOnlySigma * window.devicePixelRatio}px)';
+    return 'blur(${maskFilter.webOnlySigma * EngineFlutterDisplay.instance.devicePixelRatio}px)';
   } else {
     return 'none';
   }

lib/web_ui/lib/src/engine/html/scene_builder.dart

@@ -8,12 +8,12 @@ import 'package:ui/ui.dart' as ui;
 import 'package:ui/ui_web/src/ui_web.dart' as ui_web;
 
 import '../../engine.dart' show kProfileApplyFrame, kProfilePrerollFrame;
+import '../display.dart';
 import '../dom.dart';
 import '../picture.dart';
 import '../profiler.dart';
 import '../util.dart';
 import '../vector_math.dart';
-import '../window.dart';
 import 'backdrop_filter.dart';
 import 'clip.dart';
 import 'color_filter.dart';
@@ -113,8 +113,8 @@ class SurfaceSceneBuilder implements ui.SceneBuilder {
       // scene to devicepixelratio. Use identity instead since CSS uses
       // logical device pixels.
       if (!ui_web.debugEmulateFlutterTesterEnvironment) {
-        assert(matrix4[0] == window.devicePixelRatio &&
-            matrix4[5] == window.devicePixelRatio);
+        assert(matrix4[0] == EngineFlutterDisplay.instance.devicePixelRatio &&
+            matrix4[5] == EngineFlutterDisplay.instance.devicePixelRatio);
       }
       matrix = Matrix4.identity().storage;
     } else {

lib/web_ui/lib/src/engine/initialization.dart

@@ -218,8 +218,10 @@ Future<void> initializeEngineUi() async {
   _initializationState = DebugEngineInitializationState.initializingUi;
 
   RawKeyboard.initialize(onMacOs: operatingSystem == OperatingSystem.macOs);
-  ensureImplicitViewInitialized(hostElement: configuration.hostElement);
-  ensureFlutterViewEmbedderInitialized();
+  if (!configuration.multiViewEnabled) {
+    ensureImplicitViewInitialized(hostElement: configuration.hostElement);
+    ensureFlutterViewEmbedderInitialized();
+  }
   _initializationState = DebugEngineInitializationState.initialized;
 }
 

lib/web_ui/lib/src/engine/platform_dispatcher.dart

@@ -500,10 +500,22 @@ class EnginePlatformDispatcher extends ui.PlatformDispatcher {
             // TODO(a-wallen): As multi-window support expands, the pop call
             // will need to include the view ID. Right now only one view is
             // supported.
-            implicitView!.browserHistory.exit().then((_) {
+            //
+            // TODO(mdebbar): What should we do in multi-view mode?
+            //                https://github.com/flutter/flutter/issues/139174
+            if (implicitView != null) {
+              implicitView!.browserHistory.exit().then((_) {
+                replyToPlatformMessage(
+                  callback,
+                  jsonCodec.encodeSuccessEnvelope(true),
+                );
+              });
+            } else {
               replyToPlatformMessage(
-                  callback, jsonCodec.encodeSuccessEnvelope(true));
-            });
+                callback,
+                jsonCodec.encodeSuccessEnvelope(true),
+              );
+            }
             return;
           case 'HapticFeedback.vibrate':
             final String? type = decoded.arguments as String?;
@@ -588,7 +600,9 @@ class EnginePlatformDispatcher extends ui.PlatformDispatcher {
             decoded.arguments as Map<dynamic, dynamic>;
         switch (decoded.method) {
           case 'activateSystemCursor':
-            implicitView!.mouseCursor
+            // TODO(mdebbar): This needs a view ID from the framework.
+            //                https://github.com/flutter/flutter/issues/137289
+            implicitView?.mouseCursor
                 .activateSystemCursor(arguments.tryString('kind'));
         }
         return;
@@ -628,14 +642,23 @@ class EnginePlatformDispatcher extends ui.PlatformDispatcher {
         // TODO(a-wallen): As multi-window support expands, the navigation call
         // will need to include the view ID. Right now only one view is
         // supported.
-        implicitView!.handleNavigationMessage(data).then((bool handled) {
-          if (handled) {
-            replyToPlatformMessage(
-                callback, jsonCodec.encodeSuccessEnvelope(true));
-          } else {
-            callback?.call(null);
-          }
-        });
+        //
+        // TODO(mdebbar): What should we do in multi-view mode?
+        //                https://github.com/flutter/flutter/issues/139174
+        if (implicitView != null) {
+          implicitView!.handleNavigationMessage(data).then((bool handled) {
+            if (handled) {
+              replyToPlatformMessage(
+                callback,
+                jsonCodec.encodeSuccessEnvelope(true),
+              );
+            } else {
+              callback?.call(null);
+            }
+          });
+        } else {
+          callback?.call(null);
+        }
 
         // As soon as Flutter starts taking control of the app navigation, we
         // should reset _defaultRouteName to "/" so it doesn't have any
@@ -1249,7 +1272,9 @@ class EnginePlatformDispatcher extends ui.PlatformDispatcher {
   ///    requests from the embedder.
   @override
   String get defaultRouteName {
-    return _defaultRouteName ??= implicitView!.browserHistory.currentPath;
+    // TODO(mdebbar): What should we do in multi-view mode?
+    //                https://github.com/flutter/flutter/issues/139174
+    return _defaultRouteName ??= implicitView?.browserHistory.currentPath ?? '/';
   }
 
   /// Lazily initialized when the `defaultRouteName` getter is invoked.

lib/web_ui/lib/src/engine/scene_view.dart

@@ -194,10 +194,11 @@ final class PictureSliceContainer extends SliceContainer {
         bounds.bottom.ceilToDouble()
       );
       final DomCSSStyleDeclaration style = canvas.style;
-      final double logicalWidth = roundedOutBounds.width / window.devicePixelRatio;
-      final double logicalHeight = roundedOutBounds.height / window.devicePixelRatio;
-      final double logicalLeft = roundedOutBounds.left / window.devicePixelRatio;
-      final double logicalTop = roundedOutBounds.top / window.devicePixelRatio;
+      final double devicePixelRatio = EngineFlutterDisplay.instance.devicePixelRatio;
+      final double logicalWidth = roundedOutBounds.width / devicePixelRatio;
+      final double logicalHeight = roundedOutBounds.height / devicePixelRatio;
+      final double logicalLeft = roundedOutBounds.left / devicePixelRatio;
+      final double logicalTop = roundedOutBounds.top / devicePixelRatio;
       style.width = '${logicalWidth}px';
       style.height = '${logicalHeight}px';
       style.position = 'absolute';
@@ -243,21 +244,23 @@ final class PlatformViewContainer extends SliceContainer {
     }
   }
 
+
   @override
   void updateContents() {
     assert(_styling != null);
     assert(_size != null);
     if (_dirty) {
       final DomCSSStyleDeclaration style = container.style;
-      final double logicalWidth = _size!.width / window.devicePixelRatio;
-      final double logicalHeight = _size!.height / window.devicePixelRatio;
+      final double devicePixelRatio = EngineFlutterDisplay.instance.devicePixelRatio;
+      final double logicalWidth = _size!.width / devicePixelRatio;
+      final double logicalHeight = _size!.height / devicePixelRatio;
       style.width = '${logicalWidth}px';
       style.height = '${logicalHeight}px';
       style.position = 'absolute';
 
       final ui.Offset? offset = _styling!.position.offset;
-      final double logicalLeft = (offset?.dx ?? 0) / window.devicePixelRatio;
-      final double logicalTop = (offset?.dy ?? 0) / window.devicePixelRatio;
+      final double logicalLeft = (offset?.dx ?? 0) / devicePixelRatio;
+      final double logicalTop = (offset?.dy ?? 0) / devicePixelRatio;
       style.left = '${logicalLeft}px';
       style.top = '${logicalTop}px';
 

lib/web_ui/lib/src/engine/skwasm/skwasm_impl/canvas.dart

@@ -375,7 +375,7 @@ class SkwasmCanvas implements SceneCanvas {
       _handle,
       path.handle,
       elevation,
-      ui.window.devicePixelRatio,
+      EngineFlutterDisplay.instance.devicePixelRatio,
       color.value,
       transparentOccluder);
   }