Implementation of some advanced widgets in flutter

you can build any of some high level flutter widget required in creating an application especially stateful widgets with managing their states.

The issue names no file, entry point, or test; begin by surveying the repository for existing Flutter widget examples and state-management code. Confirm the intended widget set and acceptance criteria with the maintainers, then define completion through working stateful widgets and corresponding tests or examples.

Written by the indexing model from the issue text.