StandardComponentType enum

An enum identifying standard UI components.

This enum is used to attach a key to a widget identifying it as a standard UI component for testing and discovery purposes.

It is used by the testing infrastructure (e.g. the find object in the Flutter test framework) to positively identify and/or activate specific widgets as representing standard UI components, since many of these components vary slightly in the icons or tooltips that they use, and making an effective test matcher for them is fragile and error prone.

The keys don't have any effect on the functioning of the UI elements, they are just a means of identifying them. A widget won't be treated specially if it has this key, other than to be found by the testing infrastructure. If tests are not searching for them, then adding them to a widget serves no purpose.

Any widget with the key from a value here applied to it will be considered to be that type of standard UI component in tests.

Types included here are generally only those for which it can be difficult or fragile to create a reliable test matcher for. It is not (nor should it become) an exhaustive list of standard UI components.

These are typically used in tests via find.backButton() or find.closeButton().