Скачать или смотреть Flutter Tutorial - Flutter Keys & Value Key

With the Flutter Value Key, you can preserve the state of Stateful Widgets while they are moving around within your Widget tree. The main Flutter Keys are ValueKey, UniqueKey, GlobalKey & ObjectKey.
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RESOURCES
Reorderable List View Tutorial:    • Flutter Tutorial - Reorderable ListView - ...  
GlobalKey Tutorial:    • Flutter Tutorial - Flutter Keys & Global Key  
UniqueKey Tutorial:    • Flutter Tutorial - Flutter Keys & Unique Key  
Inherited Widget Tutorial:    • Flutter Tutorial - Inherited Widget Explai...  
Drag & Drop Widgets Tutorial:    • Flutter Tutorial - Drag & Drop Widgets - D...  
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TIMELINE
0:00 Introduction Flutter Value Key
1:08 Purpose Of Value Key
1:31 Usecase: Remove Widget From List
3:06 Add Value Key
4:44 Add Value Key With Object
5:53 Usecase: Reorderable ListView
6:59 Add Value Key With Object Value

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