get-widget-screenshot

name	get-widget-screenshot
description	Capture PNG screenshots from a minimal testbed app that has full access to Anthem's Dart source code. Allows validation of UI changes; you optionally modify the testbed code to suit your needs, then you use the provided commands to capture the screenshot, then you look at the screenshot to validate changes.

Get Widget Screenshot

Capture screenshots from the testbed app in this repository. This can be used to validate UI changes.

Run Commands

• Desktop capture with positional args (<take screenshot> <screen>):

flutter run -d (platform) -t lib/main_testbed.dart --dart-entrypoint-args=true --dart-entrypoint-args=button

• Desktop capture with explicit output path:

flutter run -d (platform) -t lib/main_testbed.dart --dart-entrypoint-args=true --dart-entrypoint-args=knob --dart-entrypoint-args=--output=build/widget_testbed_knob.png

• Named-flag variant:

flutter run -d (platform) -t lib/main_testbed.dart --dart-entrypoint-args=--screenshot --dart-entrypoint-args=--screen=button --dart-entrypoint-args=--output=build/widget_testbed_button.png

Screens

See WidgetTestScreenId in lib/widgets/debug/widget_test_area.dart for a list of screens.

Note that you can make your own screens with widgets if the case requires, prior to running the command.

Notes

• Use desktop targets (windows, linux, macos) for --dart-entrypoint-args.
• The app exits automatically after writing the PNG when screenshot mode is enabled.