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The `theme` parameter of `Preview(...)` allows for developers to provide a callback that returns a `PreviewThemeData` instance which can contain theming data for Material and Cupertino widgets in both light and dark modes. The provided theme data will be injected into the widget tree and applied to the previewed widget. The `brightness` parameter allows for developers to specify an initial brightness setting (e.g., light vs dark mode) for the previewed widget. If not provided, the current system default is used. A new button has also been added to each widget preview card that allows for toggling between light and dark mode for individual previews. **Demo:** https://github.com/user-attachments/assets/f0a4a3bc-25d2-49b0-a5f6-9149eccfc1d4 Fixes https://github.com/flutter/flutter/issues/166436 Fixes https://github.com/flutter/flutter/issues/166275 Fixes https://github.com/flutter/flutter/issues/166279 Fixes https://github.com/flutter/flutter/issues/166437 |
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platform_views_layout
Scrolling benchmark
To run the scrolling benchmark on a device:
flutter drive --profile test_driver/scroll_perf.dart
Results should be in the file build/platform_views_scroll_perf.timeline_summary.json.
More detailed logs should be in build/platform_views_scroll_perf.timeline.json.
Startup benchmark
To measure startup time on a device:
flutter run --profile --trace-startup
The results should be in the logs.
Additional results should be in the file build/start_up_info.json.