Reduce animations further when --no-cli-animations is set. (#133598)

packages/flutter_tools/lib/executable.dart

@@ -124,13 +124,16 @@ Future<void> main(List<String> args) async {
           windows: globals.platform.isWindows,
         );
       },
-      Terminal: () {
+      AnsiTerminal: () {
         return AnsiTerminal(
           stdio: globals.stdio,
           platform: globals.platform,
           now: DateTime.now(),
-          isCliAnimationEnabled: featureFlags.isCliAnimationEnabled,
+          // So that we don't animate anything before calling applyFeatureFlags, default
+          // the animations to disabled in real apps.
+          defaultCliAnimationEnabled: false,
         );
+        // runner.run calls "terminal.applyFeatureFlags()"
       },
       PreRunValidator: () => PreRunValidator(fileSystem: globals.fs),
     },

packages/flutter_tools/lib/runner.dart

@@ -18,6 +18,7 @@ import 'src/base/logger.dart';
 import 'src/base/process.dart';
 import 'src/context_runner.dart';
 import 'src/doctor.dart';
+import 'src/features.dart';
 import 'src/globals.dart' as globals;
 import 'src/reporting/crash_reporting.dart';
 import 'src/reporting/reporting.dart';
@@ -44,6 +45,8 @@ Future<int> run(
   }
 
   return runInContext<int>(() async {
+    globals.terminal.applyFeatureFlags(featureFlags);
+
     reportCrashes ??= !await globals.isRunningOnBot;
     final FlutterCommandRunner runner = FlutterCommandRunner(verboseHelp: verboseHelp);
     commands().forEach(runner.addCommand);

packages/flutter_tools/lib/src/base/context.dart

@@ -7,6 +7,9 @@ import 'dart:collection';
 
 import 'package:meta/meta.dart';
 
+// TODO(ianh): We should remove AppContext's mechanism and replace it with
+// passing dependencies directly in constructors, methods, etc.
+
 /// Generates an [AppContext] value.
 ///
 /// Generators are allowed to return `null`, in which case the context will

packages/flutter_tools/lib/src/base/terminal.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import '../convert.dart';
+import '../features.dart';
 import 'io.dart' as io;
 import 'logger.dart';
 import 'platform.dart';
@@ -69,6 +70,7 @@ class OutputPreferences {
 }
 
 /// The command line terminal, if available.
+// TODO(ianh): merge this with AnsiTerminal, the abstraction isn't giving us anything.
 abstract class Terminal {
   /// Create a new test [Terminal].
   ///
@@ -81,9 +83,12 @@ abstract class Terminal {
   /// to perform animations.
   bool get supportsColor;
 
-  /// Whether to show animations on this terminal.
+  /// Whether animations should be used in the output.
   bool get isCliAnimationEnabled;
 
+  /// Configures isCliAnimationEnabled based on a [FeatureFlags] object.
+  void applyFeatureFlags(FeatureFlags flags);
+
   /// Whether the current terminal can display emoji.
   bool get supportsEmoji;
 
@@ -158,11 +163,12 @@ class AnsiTerminal implements Terminal {
     required io.Stdio stdio,
     required Platform platform,
     DateTime? now, // Time used to determine preferredStyle. Defaults to 0001-01-01 00:00.
-    this.isCliAnimationEnabled = true,
+    bool defaultCliAnimationEnabled = true,
   })
     : _stdio = stdio,
       _platform = platform,
-      _now = now ?? DateTime(1);
+      _now = now ?? DateTime(1),
+      _isCliAnimationEnabled = defaultCliAnimationEnabled;
 
   final io.Stdio _stdio;
   final Platform _platform;
@@ -207,7 +213,14 @@ class AnsiTerminal implements Terminal {
   bool get supportsColor => _platform.stdoutSupportsAnsi;
 
   @override
-  final bool isCliAnimationEnabled;
+  bool get isCliAnimationEnabled => _isCliAnimationEnabled;
+
+  bool _isCliAnimationEnabled;
+
+  @override
+  void applyFeatureFlags(FeatureFlags flags) {
+    _isCliAnimationEnabled = flags.isCliAnimationEnabled;
+  }
 
   // Assume unicode emojis are supported when not on Windows.
   // If we are on Windows, unicode emojis are supported in Windows Terminal,
@@ -419,7 +432,14 @@ class _TestTerminal implements Terminal {
   final bool supportsColor;
 
   @override
-  bool get isCliAnimationEnabled => supportsColor;
+  bool get isCliAnimationEnabled => supportsColor && _isCliAnimationEnabled;
+
+  bool _isCliAnimationEnabled = true;
+
+  @override
+  void applyFeatureFlags(FeatureFlags flags) {
+    _isCliAnimationEnabled = flags.isCliAnimationEnabled;
+  }
 
   @override
   final bool supportsEmoji;

packages/flutter_tools/lib/src/context_runner.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-
-
 import 'dart:async';
 
 import 'package:process/process.dart';
@@ -84,6 +82,8 @@ Future<T> runInContext<T>(
     return runner();
   }
 
+  // TODO(ianh): We should split this into two, one for tests (which should be
+  // in test/), and one for production (which should be in executable.dart).
   return context.run<T>(
     name: 'global fallbacks',
     body: runnerWrapper,

packages/flutter_tools/lib/src/features.dart

@@ -5,8 +5,6 @@
 import 'base/context.dart';
 
 /// The current [FeatureFlags] implementation.
-///
-/// If not injected, a default implementation is provided.
 FeatureFlags get featureFlags => context.get<FeatureFlags>()!;
 
 /// The interface used to determine if a particular [Feature] is enabled.

packages/flutter_tools/lib/src/globals.dart

@@ -49,6 +49,9 @@ import 'runner/flutter_command.dart';
 import 'runner/local_engine.dart';
 import 'version.dart';
 
+// TODO(ianh): We should remove all the global variables and replace them with
+// arguments (to constructors, methods, etc, as appropriate).
+
 Artifacts? get artifacts => context.get<Artifacts>();
 BuildSystem get buildSystem => context.get<BuildSystem>()!;
 Cache get cache => context.get<Cache>()!;

packages/flutter_tools/test/commands.shard/hermetic/custom_devices_test.dart

@@ -20,6 +20,7 @@ import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/commands/custom_devices.dart';
 import 'package:flutter_tools/src/custom_devices/custom_device_config.dart';
 import 'package:flutter_tools/src/custom_devices/custom_devices_config.dart';
+import 'package:flutter_tools/src/features.dart';
 import 'package:flutter_tools/src/runner/flutter_command_runner.dart';
 
 import '../../src/common.dart';
@@ -241,6 +242,11 @@ class FakeTerminal implements Terminal {
   @override
   bool get isCliAnimationEnabled => terminal.isCliAnimationEnabled;
 
+  @override
+  void applyFeatureFlags(FeatureFlags flags) {
+    // ignored
+  }
+
   @override
   bool get supportsEmoji => terminal.supportsEmoji;
 

packages/flutter_tools/test/general.shard/base/logger_test.dart

@@ -1292,7 +1292,7 @@ void main() {
         terminal: AnsiTerminal(
           stdio: fakeStdio,
           platform: _kNoAnsiPlatform,
-          isCliAnimationEnabled: false,
+          defaultCliAnimationEnabled: false,
         ),
         stdio: fakeStdio,
         stopwatchFactory: FakeStopwatchFactory(stopwatch: FakeStopwatch()),