[ Widget Preview ] Use analysis server for widget preview detection#184473
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This change ports the `flutter widget-preview start` command to utilize the Dart Analysis Server to detect widget previews in projects. When launched from an IDE, the widget previewer will use the existing DAS and DTD instances, greatly reducing the amount of memory consumed by the widget previewer. A `--legacy-preview-detection` flag has also been added to fall back to the previous in-process preview detection logic. This flag will be removed in a future release once the DAS implementation is proven to be stable. Fixes flutter#179584
bkonyi
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Apr 1, 2026
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| /// The set of widget previews defined in a script of an analyzed Flutter | ||
| /// project. | ||
| class FlutterWidgetPreviews { |
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This file is basically a slightly modified version of the changes made in https://dart-review.googlesource.com/c/sdk/+/478100/11/third_party/pkg/language_server_protocol/lib/protocol_custom_generated.dart
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This pull request introduces LSP-based preview detection for the widget previewer, allowing it to leverage the analysis server for more robust preview discovery. Key changes include the addition of LspPreviewDetector and FlutterWidgetPreviews data structures, updates to WidgetPreviewStartCommand to support both legacy and LSP-based detection modes, and the addition of necessary DTD service methods. Several improvements were suggested to ensure data consistency, null safety, and adherence to Dart best practices for class definitions.
jyameo
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Apr 2, 2026
| ); | ||
| } | ||
| _imports.addAll({ | ||
| for (final MapEntry(:key, :value) in imports.entries) key: int.parse(value.substring(2)), |
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nit: it might safer to use tryParse or a check to avoid throwing an exception if value doesn't follow the expected format for some reason.
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Normally I'd agree, but in this situation I think it's better to throw an exception so we can get a signal that the analyzer is returning a poorly formatted response since this should always be an integer.
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flutter/flutter@0f401ee...7245c3f 2026-04-03 engine-flutter-autoroll@skia.org Roll Skia from c07c67045b6d to 5d847ba5c4aa (1 revision) (flutter/flutter#184570) 2026-04-03 engine-flutter-autoroll@skia.org Roll Dart SDK from 3c7a79045b8b to 46f49142acd9 (1 revision) (flutter/flutter#184567) 2026-04-03 engine-flutter-autoroll@skia.org Roll ICU from ee5f27adc28b to ff7995a708a1 (5 revisions) (flutter/flutter#184566) 2026-04-03 engine-flutter-autoroll@skia.org Roll Skia from 9ae8231be181 to c07c67045b6d (4 revisions) (flutter/flutter#184562) 2026-04-03 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from BFLjk6Uwd0gs_Hkdk... to PpL3Bn2YMb2h9LbdK... (flutter/flutter#184556) 2026-04-03 engine-flutter-autoroll@skia.org Roll Skia from 0566b2f5f0d1 to 9ae8231be181 (1 revision) (flutter/flutter#184547) 2026-04-03 engine-flutter-autoroll@skia.org Roll Dart SDK from 6008eaddd589 to 3c7a79045b8b (3 revisions) (flutter/flutter#184551) 2026-04-03 evanwall@buffalo.edu Fix wide gamut macos integration test (flutter/flutter#184427) 2026-04-02 jakemac@google.com forward an application name to DDS (flutter/flutter#184459) 2026-04-02 engine-flutter-autoroll@skia.org Roll Skia from 973117cfa875 to 0566b2f5f0d1 (8 revisions) (flutter/flutter#184534) 2026-04-02 97480502+b-luk@users.noreply.github.com Support different joins for stroked rects in uber_sdf, fix incorrect aa (flutter/flutter#184395) 2026-04-02 bkonyi@google.com [ Widget Preview ] Handle collections and records in custom preview annotations (flutter/flutter#184518) 2026-04-02 47866232+chunhtai@users.noreply.github.com Moves android_semantics_integration_test out of staging (flutter/flutter#184079) 2026-04-02 engine-flutter-autoroll@skia.org Roll Packages from b3fcf14 to 66bf7ec (4 revisions) (flutter/flutter#184514) 2026-04-02 rmolivares@renzo-olivares.dev Fix line breaks being lost when copying after selection gesture in SelectableRegion (flutter/flutter#184421) 2026-04-02 15619084+vashworth@users.noreply.github.com Add plugin version to SwiftPM package symlink directory (flutter/flutter#183668) 2026-04-02 34871572+gmackall@users.noreply.github.com Add our own wrapper for `CommonExtension` due to change in signature from 8.x->9.0 (flutter/flutter#184433) 2026-04-02 dbebawy@users.noreply.github.com [Android] Use EdgeToEdge.enable/WindowCompat for edge-to-edge mode instead of deprecated View flags (flutter/flutter#183072) 2026-04-02 dacoharkes@google.com [data_assets] Cleanup tests (flutter/flutter#184209) 2026-04-02 okorohelijah@google.com Enable SPM by default on Stable (flutter/flutter#184495) 2026-04-02 engine-flutter-autoroll@skia.org Roll Dart SDK from d84bdfeb45eb to 6008eaddd589 (2 revisions) (flutter/flutter#184513) 2026-04-02 victorsanniay@gmail.com Reland "Even more awaits" (flutter/flutter#184467) 2026-04-02 engine-flutter-autoroll@skia.org Roll Skia from bb9fd8653739 to 973117cfa875 (2 revisions) (flutter/flutter#184498) 2026-04-02 bkonyi@google.com [ Widget Preview ] Use analysis server for widget preview detection (flutter/flutter#184473) 2026-04-02 srawlins@google.com [web_ui] Fix avoid_type_to_string lint violation (flutter/flutter#184342) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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…lutter#184473) This change ports the `flutter widget-preview start` command to utilize the Dart Analysis Server to detect widget previews in projects. When launched from an IDE, the widget previewer will use the existing DAS and DTD instances, greatly reducing the amount of memory consumed by the widget previewer. A `--legacy-preview-detection` flag has also been added to fall back to the previous in-process preview detection logic. This flag will be removed in a future release once the DAS implementation is proven to be stable. Fixes flutter#179584
creatorpiyush
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Jun 10, 2026
…r#11427) flutter/flutter@0f401ee...7245c3f 2026-04-03 engine-flutter-autoroll@skia.org Roll Skia from c07c67045b6d to 5d847ba5c4aa (1 revision) (flutter/flutter#184570) 2026-04-03 engine-flutter-autoroll@skia.org Roll Dart SDK from 3c7a79045b8b to 46f49142acd9 (1 revision) (flutter/flutter#184567) 2026-04-03 engine-flutter-autoroll@skia.org Roll ICU from ee5f27adc28b to ff7995a708a1 (5 revisions) (flutter/flutter#184566) 2026-04-03 engine-flutter-autoroll@skia.org Roll Skia from 9ae8231be181 to c07c67045b6d (4 revisions) (flutter/flutter#184562) 2026-04-03 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from BFLjk6Uwd0gs_Hkdk... to PpL3Bn2YMb2h9LbdK... (flutter/flutter#184556) 2026-04-03 engine-flutter-autoroll@skia.org Roll Skia from 0566b2f5f0d1 to 9ae8231be181 (1 revision) (flutter/flutter#184547) 2026-04-03 engine-flutter-autoroll@skia.org Roll Dart SDK from 6008eaddd589 to 3c7a79045b8b (3 revisions) (flutter/flutter#184551) 2026-04-03 evanwall@buffalo.edu Fix wide gamut macos integration test (flutter/flutter#184427) 2026-04-02 jakemac@google.com forward an application name to DDS (flutter/flutter#184459) 2026-04-02 engine-flutter-autoroll@skia.org Roll Skia from 973117cfa875 to 0566b2f5f0d1 (8 revisions) (flutter/flutter#184534) 2026-04-02 97480502+b-luk@users.noreply.github.com Support different joins for stroked rects in uber_sdf, fix incorrect aa (flutter/flutter#184395) 2026-04-02 bkonyi@google.com [ Widget Preview ] Handle collections and records in custom preview annotations (flutter/flutter#184518) 2026-04-02 47866232+chunhtai@users.noreply.github.com Moves android_semantics_integration_test out of staging (flutter/flutter#184079) 2026-04-02 engine-flutter-autoroll@skia.org Roll Packages from b3fcf14 to 66bf7ec (4 revisions) (flutter/flutter#184514) 2026-04-02 rmolivares@renzo-olivares.dev Fix line breaks being lost when copying after selection gesture in SelectableRegion (flutter/flutter#184421) 2026-04-02 15619084+vashworth@users.noreply.github.com Add plugin version to SwiftPM package symlink directory (flutter/flutter#183668) 2026-04-02 34871572+gmackall@users.noreply.github.com Add our own wrapper for `CommonExtension` due to change in signature from 8.x->9.0 (flutter/flutter#184433) 2026-04-02 dbebawy@users.noreply.github.com [Android] Use EdgeToEdge.enable/WindowCompat for edge-to-edge mode instead of deprecated View flags (flutter/flutter#183072) 2026-04-02 dacoharkes@google.com [data_assets] Cleanup tests (flutter/flutter#184209) 2026-04-02 okorohelijah@google.com Enable SPM by default on Stable (flutter/flutter#184495) 2026-04-02 engine-flutter-autoroll@skia.org Roll Dart SDK from d84bdfeb45eb to 6008eaddd589 (2 revisions) (flutter/flutter#184513) 2026-04-02 victorsanniay@gmail.com Reland "Even more awaits" (flutter/flutter#184467) 2026-04-02 engine-flutter-autoroll@skia.org Roll Skia from bb9fd8653739 to 973117cfa875 (2 revisions) (flutter/flutter#184498) 2026-04-02 bkonyi@google.com [ Widget Preview ] Use analysis server for widget preview detection (flutter/flutter#184473) 2026-04-02 srawlins@google.com [web_ui] Fix avoid_type_to_string lint violation (flutter/flutter#184342) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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This change ports the
flutter widget-preview startcommand to utilize the Dart Analysis Server to detect widget previews in projects. When launched from an IDE, the widget previewer will use the existing DAS and DTD instances, greatly reducing the amount of memory consumed by the widget previewer.A
--legacy-preview-detectionflag has also been added to fall back to the previous in-process preview detection logic. This flag will be removed in a future release once the DAS implementation is proven to be stable.Fixes #179584