flutter · vsmenon · Feb 20, 2020 · Feb 6, 2020 · Feb 10, 2020 · Feb 11, 2020
diff --git a/lib/ui/channel_buffers.dart b/lib/ui/channel_buffers.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// A saved platform message for a channel with its callback.

diff --git a/lib/ui/compositing.dart b/lib/ui/compositing.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// An opaque object representing a composited scene.

diff --git a/lib/ui/geometry.dart b/lib/ui/geometry.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// Base class for [Size] and [Offset], which are both ways to describe

diff --git a/lib/ui/hash_codes.dart b/lib/ui/hash_codes.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 class _HashEnd { const _HashEnd(); }

diff --git a/lib/ui/hooks.dart b/lib/ui/hooks.dart
@@ -4,6 +4,7 @@
 
 // TODO(dnfield): Remove unused_import ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
 
+// @dart = 2.6
 part of dart.ui;
 
 // ignore: unused_element

diff --git a/lib/ui/isolate_name_server.dart b/lib/ui/isolate_name_server.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// Static methods to allow for simple sharing of [SendPort]s across [Isolate]s.

diff --git a/lib/ui/lerp.dart b/lib/ui/lerp.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// Linearly interpolate between two numbers.

diff --git a/lib/ui/natives.dart b/lib/ui/natives.dart
@@ -4,6 +4,7 @@
 
 // TODO(dnfield): remove unused_element ignores when https://github.com/dart-lang/sdk/issues/35164 is resolved.
 
+// @dart = 2.6
 part of dart.ui;
 
 // Corelib 'print' implementation.

diff --git a/lib/ui/painting.dart b/lib/ui/painting.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 // Some methods in this file assert that their arguments are not null. These

diff --git a/lib/ui/plugins.dart b/lib/ui/plugins.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// A wrapper for a raw callback handle.

diff --git a/lib/ui/pointer.dart b/lib/ui/pointer.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// How the pointer has changed since the last report.

diff --git a/lib/ui/semantics.dart b/lib/ui/semantics.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// The possible actions that can be conveyed from the operating system

diff --git a/lib/ui/text.dart b/lib/ui/text.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// Whether to slant the glyphs in the font

diff --git a/lib/ui/ui.dart b/lib/ui/ui.dart
@@ -9,6 +9,7 @@
 /// This library exposes the lowest-level services that Flutter frameworks use
 /// to bootstrap applications, such as classes for driving the input, graphics
 /// text, layout, and rendering subsystems.
+// @dart = 2.6
 library dart.ui;
 
 import 'dart:_internal' hide Symbol; // ignore: import_internal_library, unused_import

diff --git a/lib/ui/window.dart b/lib/ui/window.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of dart.ui;
 
 /// Signature of callbacks that have no arguments and return no data.

diff --git a/lib/web_ui/lib/src/engine.dart b/lib/web_ui/lib/src/engine.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 library engine;
 
 import 'dart:async';

diff --git a/lib/web_ui/lib/src/engine/alarm_clock.dart b/lib/web_ui/lib/src/engine/alarm_clock.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A function that returns current system time.

diff --git a/lib/web_ui/lib/src/engine/assets.dart b/lib/web_ui/lib/src/engine/assets.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// This class downloads assets over the network.

diff --git a/lib/web_ui/lib/src/engine/bitmap_canvas.dart b/lib/web_ui/lib/src/engine/bitmap_canvas.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A raw HTML canvas that is directly written to.

diff --git a/lib/web_ui/lib/src/engine/browser_detection.dart b/lib/web_ui/lib/src/engine/browser_detection.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// The HTML engine used by the current browser.

diff --git a/lib/web_ui/lib/src/engine/browser_location.dart b/lib/web_ui/lib/src/engine/browser_location.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 // TODO(mdebbar): add other strategies.

diff --git a/lib/web_ui/lib/src/engine/canvas_pool.dart b/lib/web_ui/lib/src/engine/canvas_pool.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// Allocates and caches 0 or more canvas(s) for [BitmapCanvas].

diff --git a/lib/web_ui/lib/src/engine/clipboard.dart b/lib/web_ui/lib/src/engine/clipboard.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// Handles clipboard related platform messages.

diff --git a/lib/web_ui/lib/src/engine/color_filter.dart b/lib/web_ui/lib/src/engine/color_filter.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A description of a color filter to apply when drawing a shape or compositing

diff --git a/lib/web_ui/lib/src/engine/compositor/canvas.dart b/lib/web_ui/lib/src/engine/compositor/canvas.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A Dart wrapper around Skia's SKCanvas.

diff --git a/lib/web_ui/lib/src/engine/compositor/canvas_kit_canvas.dart b/lib/web_ui/lib/src/engine/compositor/canvas_kit_canvas.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// An implementation of [ui.Canvas] that is backed by a CanvasKit canvas.

diff --git a/lib/web_ui/lib/src/engine/compositor/color_filter.dart b/lib/web_ui/lib/src/engine/compositor/color_filter.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A [ui.ColorFilter] backed by Skia's [SkColorFilter].

diff --git a/lib/web_ui/lib/src/engine/compositor/embedded_views.dart b/lib/web_ui/lib/src/engine/compositor/embedded_views.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// This composites HTML views into the [ui.Scene].

diff --git a/lib/web_ui/lib/src/engine/compositor/engine_delegate.dart b/lib/web_ui/lib/src/engine/compositor/engine_delegate.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 const String assetChannel = 'flutter/assets';

diff --git a/lib/web_ui/lib/src/engine/compositor/fonts.dart b/lib/web_ui/lib/src/engine/compositor/fonts.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 const String _robotoUrl =

diff --git a/lib/web_ui/lib/src/engine/compositor/image.dart b/lib/web_ui/lib/src/engine/compositor/image.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// Instantiates a [ui.Codec] backed by an `SkImage` from Skia.

diff --git a/lib/web_ui/lib/src/engine/compositor/image_filter.dart b/lib/web_ui/lib/src/engine/compositor/image_filter.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// The CanvasKit implementation of [ui.ImageFilter].

diff --git a/lib/web_ui/lib/src/engine/compositor/initialization.dart b/lib/web_ui/lib/src/engine/compositor/initialization.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// EXPERIMENTAL: Enable the Skia-based rendering backend.

diff --git a/lib/web_ui/lib/src/engine/compositor/layer.dart b/lib/web_ui/lib/src/engine/compositor/layer.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A layer to be composed into a scene.

diff --git a/lib/web_ui/lib/src/engine/compositor/layer_scene_builder.dart b/lib/web_ui/lib/src/engine/compositor/layer_scene_builder.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 class LayerScene implements ui.Scene {

diff --git a/lib/web_ui/lib/src/engine/compositor/layer_tree.dart b/lib/web_ui/lib/src/engine/compositor/layer_tree.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A tree of [Layer]s that, together with a [Size] compose a frame.

diff --git a/lib/web_ui/lib/src/engine/compositor/n_way_canvas.dart b/lib/web_ui/lib/src/engine/compositor/n_way_canvas.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A virtual canvas that applies operations to multiple canvases at once.

diff --git a/lib/web_ui/lib/src/engine/compositor/painting.dart b/lib/web_ui/lib/src/engine/compositor/painting.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// The implementation of [ui.Paint] used by the CanvasKit backend.

diff --git a/lib/web_ui/lib/src/engine/compositor/path.dart b/lib/web_ui/lib/src/engine/compositor/path.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// An implementation of [ui.Path] which is backed by an `SkPath`.

diff --git a/lib/web_ui/lib/src/engine/compositor/path_metrics.dart b/lib/web_ui/lib/src/engine/compositor/path_metrics.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 class SkPathMetrics extends IterableBase<ui.PathMetric>

diff --git a/lib/web_ui/lib/src/engine/compositor/picture.dart b/lib/web_ui/lib/src/engine/compositor/picture.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 class SkPicture implements ui.Picture {

diff --git a/lib/web_ui/lib/src/engine/compositor/picture_recorder.dart b/lib/web_ui/lib/src/engine/compositor/picture_recorder.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 class SkPictureRecorder implements ui.PictureRecorder {

diff --git a/lib/web_ui/lib/src/engine/compositor/platform_message.dart b/lib/web_ui/lib/src/engine/compositor/platform_message.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 class PlatformMessage {

diff --git a/lib/web_ui/lib/src/engine/compositor/raster_cache.dart b/lib/web_ui/lib/src/engine/compositor/raster_cache.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A cache of [Picture]s that have already been rasterized.

diff --git a/lib/web_ui/lib/src/engine/compositor/rasterizer.dart b/lib/web_ui/lib/src/engine/compositor/rasterizer.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// A class that can rasterize [LayerTree]s into a given [Surface].

diff --git a/lib/web_ui/lib/src/engine/compositor/runtime_delegate.dart b/lib/web_ui/lib/src/engine/compositor/runtime_delegate.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 abstract class RuntimeDelegate {

diff --git a/lib/web_ui/lib/src/engine/compositor/surface.dart b/lib/web_ui/lib/src/engine/compositor/surface.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 typedef SubmitCallback = bool Function(SurfaceFrame, SkCanvas);

diff --git a/lib/web_ui/lib/src/engine/compositor/text.dart b/lib/web_ui/lib/src/engine/compositor/text.dart
@@ -1,6 +1,7 @@
 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
+// @dart = 2.6
 part of engine;
 
 // TODO(hterkelsen): Get rid of this once we can register font families with

diff --git a/lib/web_ui/lib/src/engine/compositor/util.dart b/lib/web_ui/lib/src/engine/compositor/util.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 /// An object backed by a [js.JsObject] mapped onto a Skia C++ object in the

diff --git a/lib/web_ui/lib/src/engine/compositor/vertices.dart b/lib/web_ui/lib/src/engine/compositor/vertices.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// @dart = 2.6
 part of engine;
 
 Int32List _encodeColorList(List<ui.Color> colors) {