Flutter commonly uses keys when it needs to uniquely identify specific widgets within a collection . Using keys also helps Flutter preserve the state of StatefulWidget s while they’re being replaced with other widgets or just moved in the widget tree.
Read moreWhy do we need widgets in Flutter?
Flutter widgets are built using a modern framework that takes inspiration from React. The central idea is that you build your UI out of widgets. Widgets describe what their view should look like given their current configuration and state .
Read moreWhat is DART key?
A Key is an identifier for Widgets, Elements and SemanticsNodes . A new widget will only be used to update an existing element if its key is the same as the key of the current widget associated with the element.
Read moreWhen should I use stateful widgets?
Stateful widgets are useful when the part of the user interface you are describing can change dynamically , e.g. due to having an internal clock-driven state, or depending on some system state.
Read moreWhen would you use a Consumer widget?
The Consumer widget has two main purposes: It allows obtaining a value from a provider when we don’t have a BuildContext that is a descendant of said provider, and therefore cannot use Provider .
Read moreHow do you consume providers in Flutter?
The generics (values inside <> brackets) tell Flutter what type of provider to look for. Then Flutter goes up through the widget tree until it finds the provided value. If the value isn’t provided anywhere then an exception is thrown. Finally, once you’ve got the provider, you can call any method on it.12 Haz 2020
Read moreHow do I access provider data Flutter?
You have to pass the thing being provided directly to the dialog constructor to access it in the dialog’s new context . You can also give it to a new Provider widget at the top of your dialog tree if you have a very deep widget tree in the dialog and you want to access it from somewhere deeper.
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