Feat: Animate fill for material app bar #163913

rkishan516 · 2025-02-22T05:57:38Z

Feat: Animate fill for material app bar
fixes: #162988

Pre-launch Checklist

I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
I read the [Tree Hygiene] wiki page, which explains my responsibilities.
I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
I signed the [CLA].
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is [test-exempt].
I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
All existing and new tests are passing.

flutter-dashboard · 2025-02-22T07:51:13Z

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Changes reported for pull request #163913 at sha a3352c9

dkwingsmt · 2025-02-25T19:50:31Z

Thanks for the change. Although I do see how it's improving the fidelity, it probably shouldn't be implemented on Material, which controls all widgets, but instead should be in the app bar widget.

Also we'll need some tests to guarantee it's not broken after the merge.

rkishan516 · 2025-03-17T06:12:44Z

@dkwingsmt Its ready to review again.

dkwingsmt · 2025-03-18T06:59:58Z

packages/flutter/test/material/app_bar_test.dart

+
+      expect(getAppBarAnimatedBackgroundColor(tester), defaultColor);
+      await tester.pumpAndSettle();
+      expect(getAppBarAnimatedBackgroundColor(tester), scrolledColor);


I don't think this test case verifies the feature. It only verifies the starting color and ending color, while you're trying to verify that there's a smooth animation in between. I recommend going without pumpAndSettle but pumping a time instead, and it should result in a intermediate color.

Sure. Let me do the change.

I have pushed changes for 2 intermediate color.

At 50ms after animation start

At 100ms after animation start

Animation duration is 200ms.

dkwingsmt · 2025-03-18T21:45:41Z

The errors seem to be caused by comparing equality of the floating points. Try isSameColorAs, which allows tolerance. (Also therefore you don't need that much precision)

rkishan516 · 2025-03-18T22:06:42Z

The errors seem to be caused by comparing equality of the floating points. Try isSameColorAs, which allows tolerance. (Also therefore you don't need that much precision)

Thanks, this worked very well.

dkwingsmt

LGTM

QuncCccccc

Thank you for your contribution! This looks great to me. Just left one comment and then we are good to go:)

QuncCccccc · 2025-04-02T01:26:42Z

packages/flutter/test/material/app_bar_test.dart

@@ -2339,6 +2341,39 @@ void main() {
      expect(tester.getSize(findAppBarMaterial()).height, kToolbarHeight);
    });

+    testWidgets('backgroundColor animation', (WidgetTester tester) async {
+      await tester.pumpWidget(
+        buildAppBar(contentHeight: 1200.0, surfaceTintColor: Colors.transparent),


surfaceTintColor has been deprecated in specs, even though we haven't cleaned it up here. So I think it would be better if we don't introduce more use case like this. Instead of changing surfaceTintColor to transparent, I think assigning scrolledUnderElevation: 0 in appbar will also work for this test.

Sure, let me push the change.

QuncCccccc · 2025-04-09T04:56:00Z

packages/flutter/test/material/app_bar_test.dart

@@ -2244,11 +2244,15 @@ void main() {
      required double contentHeight,
      bool reverse = false,
      bool includeFlexibleSpace = false,
+      Color? surfaceTintColor,


Suggested change

Color? surfaceTintColor,

QuncCccccc · 2025-04-09T04:56:10Z

packages/flutter/test/material/app_bar_test.dart

    }) {
      return MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            elevation: 0,
+            surfaceTintColor: surfaceTintColor,


Suggested change

surfaceTintColor: surfaceTintColor,

QuncCccccc · 2025-04-09T17:54:29Z

I took a look at the failed Google testing yesterday, seems it breaks several tests and causes wrong background color for appbar. I'm still not sure the root cause.

QuncCccccc · 2025-04-30T17:50:12Z

Just an update, I'm looking at the google failures today:)

QuncCccccc · 2025-05-01T00:23:27Z

I'm still very confused what caused the Scuba failures:( Might need to ask for some help from @dkwingsmt to see if he has any insights. It seems some failures show that the background color of the app bar just disappear.

I'm thinking if we can add an animateColor flag for app bar and defaults to false so we don't break the current apps?

dkwingsmt · 2025-05-01T00:40:13Z

It seems that the failures are real. I'm taking a look.

rkishan516 · 2025-05-01T00:42:09Z

I have added animateColor property to AppBar.

QuncCccccc · 2025-05-01T01:13:20Z

I have added animateColor property to AppBar.

Ah so quick! I talked with @dkwingsmt offline just now. Can we still keep the original fix? I think we found the cause, so I'll provide a fix in g3.

This reverts commit da75dbd.

This reverts commit d6c28c6.

rkishan516 · 2025-05-07T01:11:13Z

Hi @rkishan516! We noticed that some failed tests in google testing are hard to reproduce. The failures might just come from how the tests are constructed instead of the change that this PR made. We still don't want users to directly accept the diffs, instead, can we provide a flag option animateColor or animateBackgroundColor for AppBar and make the default value to be false, so that for users who really wants the animation behavior can turn on the flag. Sorry for the back and forth discussion:)!

No, issue. I have pushed the change.

QuncCccccc

LGTM! Thanks for your contribution and quick response!

QuncCccccc · 2025-05-07T16:49:18Z

packages/flutter/lib/src/material/app_bar.dart

@@ -773,6 +774,9 @@ class AppBar extends StatefulWidget implements PreferredSizeWidget {
  /// {@endtemplate}
  final EdgeInsetsGeometry? actionsPadding;

+  /// Whether the color should be animated.


Suggested change

/// Whether the color should be animated.

/// Whether the background color should be animated when scroll starts and ends.

…3913)

Roll Flutter from cfb887cd5f41 to b0f5c8ce03e2 (281 revisions) flutter/flutter@cfb887c...b0f5c8c 2025-05-07 34465683+rkishan516@users.noreply.github.com Feat: Animate fill for material app bar (flutter/flutter#163913) 2025-05-07 engine-flutter-autoroll@skia.org Roll Packages from e800da7 to b2ce3b0 (3 revisions) (flutter/flutter#168483) 2025-05-07 15619084+vashworth@users.noreply.github.com Allow iOS devicelab tests to run on macOS 15.1 (flutter/flutter#168234) 2025-05-07 engine-flutter-autoroll@skia.org Roll Skia from c8f54c1bc565 to 14f3e3209b73 (1 revision) (flutter/flutter#168477) 2025-05-07 engine-flutter-autoroll@skia.org Roll Skia from 55d98def951d to c8f54c1bc565 (1 revision) (flutter/flutter#168452) 2025-05-07 engine-flutter-autoroll@skia.org Roll Fuchsia Test Scripts from TcALRG6cjvR6RVe4L... to xobrcSN07udKdXOq_... (flutter/flutter#168444) 2025-05-07 engine-flutter-autoroll@skia.org Roll Skia from 32591be9cd3b to 55d98def951d (2 revisions) (flutter/flutter#168440) 2025-05-07 chris@bracken.jp macOS: trailing closures for FlutterRunLoop.perform* (flutter/flutter#168415) 2025-05-07 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from SOlRUoAtzxSsarx-6... to _GJje-N2Jk51qtBs6... (flutter/flutter#168434) 2025-05-07 chris@bracken.jp iOS/macOS: Consistent Flutter copyright headers (flutter/flutter#168390) 2025-05-06 jason-simmons@users.noreply.github.com Capture errors when running flutter_tools in the entrypoint_dart_registrant devicelab test (flutter/flutter#168411) 2025-05-06 markzipan@google.com Extending timeouts for DDC macrobenchmarks (flutter/flutter#168409) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 36d1445ad00b to 32591be9cd3b (1 revision) (flutter/flutter#168421) 2025-05-06 jmccandless@google.com Ignore pointer on the outgoing route (flutter/flutter#168425) 2025-05-06 jacksongardner@google.com [skwasm] Dispose underlying picture recorder when ending recording. (flutter/flutter#168384) 2025-05-06 chinmaygarde@google.com [Impeller] libImpeller: Expose access to conservative path bounds. (flutter/flutter#168402) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 5cf5d0ff46d9 to 36d1445ad00b (1 revision) (flutter/flutter#168401) 2025-05-06 sokolovskyi.konstantin@gmail.com Add height and width aspects to MediaQuery. (flutter/flutter#167829) 2025-05-06 engine-flutter-autoroll@skia.org Roll Packages from e064b04 to e800da7 (2 revisions) (flutter/flutter#168392) 2025-05-06 matanlurey@users.noreply.github.com Add `bin/internal/last_engine_commit.sh` and tests. (flutter/flutter#168387) 2025-05-06 15619084+vashworth@users.noreply.github.com Update `mac_ios` tests to run on either arm64 or x86 (flutter/flutter#168341) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 889c5b52227c to 5cf5d0ff46d9 (3 revisions) (flutter/flutter#168378) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 646573154de6 to 889c5b52227c (1 revision) (flutter/flutter#168363) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 65fd10118ec2 to 646573154de6 (3 revisions) (flutter/flutter#168360) 2025-05-06 stanleycocoa@gmail.com feat(SwitchListTile): ensure that 'isThreeLine' can be configured through the theme. (flutter/flutter#166820) 2025-05-06 kevmoo@users.noreply.github.com [tool] Refactor WebTemplate to be immutable (flutter/flutter#168201) 2025-05-06 codefu@google.com Upload `android-arm64-release` treemap to known location (flutter/flutter#168349) 2025-05-06 stanleycocoa@gmail.com feat(RadioListTile):ensure that 'isThreeLine' can be configured through the (flutter/flutter#166964) 2025-05-06 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from hjXORaFgiSd6QjK3D... to SOlRUoAtzxSsarx-6... (flutter/flutter#168347) 2025-05-05 36861262+QuncCccccc@users.noreply.github.com Revert "Wire up `MenuAnchor`, `MenuBar`, `MenuItem`-related widgets to aria roles (#165596)" (flutter/flutter#168339) 2025-05-05 jessiewong401@gmail.com Bumping framework Template Defaults to Android 16 (API 36) (flutter/flutter#166464) 2025-05-05 engine-flutter-autoroll@skia.org Roll Skia from c0404ac7ea67 to 65fd10118ec2 (3 revisions) (flutter/flutter#168346) 2025-05-05 chris@bracken.jp macOS: Support writing Swift in the macOS embedder (flutter/flutter#168174) 2025-05-05 jason-simmons@users.noreply.github.com Copy Dart SDK _internal/vm/bin sources into the sky_engine package (flutter/flutter#168238) 2025-05-05 markzipan@google.com Using headless=new for Chrome macrobenchmarks (flutter/flutter#168256) 2025-05-05 engine-flutter-autoroll@skia.org Roll Dart SDK from a1e1e2770c1e to 8dc0ecee5adc (1 revision) (flutter/flutter#168338) 2025-05-05 jason-simmons@users.noreply.github.com Check for duplicate archive paths in the engine build configuration JSON files (flutter/flutter#168248) 2025-05-05 21270878+elliette@users.noreply.github.com [Widget Inspector] Add on-device button for changing default "tap" behavior (flutter/flutter#167677) 2025-05-05 markzipan@google.com Adding utf-8 encoding to hello world's html template (flutter/flutter#168162) 2025-05-05 1063596+reidbaker@users.noreply.github.com Update goldens.dart error to point to moved file (flutter/flutter#168319) 2025-05-05 jacksongardner@google.com Skwasm heavy (flutter/flutter#166619) 2025-05-05 jason-simmons@users.noreply.github.com Manual roll of Dart from 5c535a368799 to a1e1e2770c1e (flutter/flutter#168317) 2025-05-05 engine-flutter-autoroll@skia.org Roll Skia from 9e23a55870e9 to c0404ac7ea67 (1 revision) (flutter/flutter#168321) 2025-05-05 52936414+CoderNamedHendrick@users.noreply.github.com Cupertino sheet MediaQuery values (flutter/flutter#168041) 2025-05-05 34871572+gmackall@users.noreply.github.com Change FGP unit test `expect` to match on process result instead of exit code (flutter/flutter#168278) 2025-05-05 flar@google.com [Impeller] Use StrokeParameters anywhere stroke is described (flutter/flutter#168276) ...

…er#9223) Roll Flutter from cfb887cd5f41 to b0f5c8ce03e2 (281 revisions) flutter/flutter@cfb887c...b0f5c8c 2025-05-07 34465683+rkishan516@users.noreply.github.com Feat: Animate fill for material app bar (flutter/flutter#163913) 2025-05-07 engine-flutter-autoroll@skia.org Roll Packages from e800da7 to b2ce3b0 (3 revisions) (flutter/flutter#168483) 2025-05-07 15619084+vashworth@users.noreply.github.com Allow iOS devicelab tests to run on macOS 15.1 (flutter/flutter#168234) 2025-05-07 engine-flutter-autoroll@skia.org Roll Skia from c8f54c1bc565 to 14f3e3209b73 (1 revision) (flutter/flutter#168477) 2025-05-07 engine-flutter-autoroll@skia.org Roll Skia from 55d98def951d to c8f54c1bc565 (1 revision) (flutter/flutter#168452) 2025-05-07 engine-flutter-autoroll@skia.org Roll Fuchsia Test Scripts from TcALRG6cjvR6RVe4L... to xobrcSN07udKdXOq_... (flutter/flutter#168444) 2025-05-07 engine-flutter-autoroll@skia.org Roll Skia from 32591be9cd3b to 55d98def951d (2 revisions) (flutter/flutter#168440) 2025-05-07 chris@bracken.jp macOS: trailing closures for FlutterRunLoop.perform* (flutter/flutter#168415) 2025-05-07 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from SOlRUoAtzxSsarx-6... to _GJje-N2Jk51qtBs6... (flutter/flutter#168434) 2025-05-07 chris@bracken.jp iOS/macOS: Consistent Flutter copyright headers (flutter/flutter#168390) 2025-05-06 jason-simmons@users.noreply.github.com Capture errors when running flutter_tools in the entrypoint_dart_registrant devicelab test (flutter/flutter#168411) 2025-05-06 markzipan@google.com Extending timeouts for DDC macrobenchmarks (flutter/flutter#168409) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 36d1445ad00b to 32591be9cd3b (1 revision) (flutter/flutter#168421) 2025-05-06 jmccandless@google.com Ignore pointer on the outgoing route (flutter/flutter#168425) 2025-05-06 jacksongardner@google.com [skwasm] Dispose underlying picture recorder when ending recording. (flutter/flutter#168384) 2025-05-06 chinmaygarde@google.com [Impeller] libImpeller: Expose access to conservative path bounds. (flutter/flutter#168402) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 5cf5d0ff46d9 to 36d1445ad00b (1 revision) (flutter/flutter#168401) 2025-05-06 sokolovskyi.konstantin@gmail.com Add height and width aspects to MediaQuery. (flutter/flutter#167829) 2025-05-06 engine-flutter-autoroll@skia.org Roll Packages from e064b04 to e800da7 (2 revisions) (flutter/flutter#168392) 2025-05-06 matanlurey@users.noreply.github.com Add `bin/internal/last_engine_commit.sh` and tests. (flutter/flutter#168387) 2025-05-06 15619084+vashworth@users.noreply.github.com Update `mac_ios` tests to run on either arm64 or x86 (flutter/flutter#168341) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 889c5b52227c to 5cf5d0ff46d9 (3 revisions) (flutter/flutter#168378) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 646573154de6 to 889c5b52227c (1 revision) (flutter/flutter#168363) 2025-05-06 engine-flutter-autoroll@skia.org Roll Skia from 65fd10118ec2 to 646573154de6 (3 revisions) (flutter/flutter#168360) 2025-05-06 stanleycocoa@gmail.com feat(SwitchListTile): ensure that 'isThreeLine' can be configured through the theme. (flutter/flutter#166820) 2025-05-06 kevmoo@users.noreply.github.com [tool] Refactor WebTemplate to be immutable (flutter/flutter#168201) 2025-05-06 codefu@google.com Upload `android-arm64-release` treemap to known location (flutter/flutter#168349) 2025-05-06 stanleycocoa@gmail.com feat(RadioListTile):ensure that 'isThreeLine' can be configured through the (flutter/flutter#166964) 2025-05-06 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from hjXORaFgiSd6QjK3D... to SOlRUoAtzxSsarx-6... (flutter/flutter#168347) 2025-05-05 36861262+QuncCccccc@users.noreply.github.com Revert "Wire up `MenuAnchor`, `MenuBar`, `MenuItem`-related widgets to aria roles (#165596)" (flutter/flutter#168339) 2025-05-05 jessiewong401@gmail.com Bumping framework Template Defaults to Android 16 (API 36) (flutter/flutter#166464) 2025-05-05 engine-flutter-autoroll@skia.org Roll Skia from c0404ac7ea67 to 65fd10118ec2 (3 revisions) (flutter/flutter#168346) 2025-05-05 chris@bracken.jp macOS: Support writing Swift in the macOS embedder (flutter/flutter#168174) 2025-05-05 jason-simmons@users.noreply.github.com Copy Dart SDK _internal/vm/bin sources into the sky_engine package (flutter/flutter#168238) 2025-05-05 markzipan@google.com Using headless=new for Chrome macrobenchmarks (flutter/flutter#168256) 2025-05-05 engine-flutter-autoroll@skia.org Roll Dart SDK from a1e1e2770c1e to 8dc0ecee5adc (1 revision) (flutter/flutter#168338) 2025-05-05 jason-simmons@users.noreply.github.com Check for duplicate archive paths in the engine build configuration JSON files (flutter/flutter#168248) 2025-05-05 21270878+elliette@users.noreply.github.com [Widget Inspector] Add on-device button for changing default "tap" behavior (flutter/flutter#167677) 2025-05-05 markzipan@google.com Adding utf-8 encoding to hello world's html template (flutter/flutter#168162) 2025-05-05 1063596+reidbaker@users.noreply.github.com Update goldens.dart error to point to moved file (flutter/flutter#168319) 2025-05-05 jacksongardner@google.com Skwasm heavy (flutter/flutter#166619) 2025-05-05 jason-simmons@users.noreply.github.com Manual roll of Dart from 5c535a368799 to a1e1e2770c1e (flutter/flutter#168317) 2025-05-05 engine-flutter-autoroll@skia.org Roll Skia from 9e23a55870e9 to c0404ac7ea67 (1 revision) (flutter/flutter#168321) 2025-05-05 52936414+CoderNamedHendrick@users.noreply.github.com Cupertino sheet MediaQuery values (flutter/flutter#168041) 2025-05-05 34871572+gmackall@users.noreply.github.com Change FGP unit test `expect` to match on process result instead of exit code (flutter/flutter#168278) 2025-05-05 flar@google.com [Impeller] Use StrokeParameters anywhere stroke is described (flutter/flutter#168276) ...

…3913)

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Feat: Animate fill for material app bar

a16c786

Feat: Add animateColor to AppBar

733537e

Revert "Feat: Add animateColor to AppBar"

84ae484

This reverts commit da75dbd.

Revert "Revert "Feat: Add animateColor to AppBar""

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	/// Whether the color should be animated.
	/// Whether the background color should be animated when scroll starts and ends.

Feat: Animate fill for material app bar #163913

Feat: Animate fill for material app bar #163913

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rkishan516 commented Feb 22, 2025 •

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