Flutter Draggable Floating Action Button Example | Flutter Tutorials

Описание: The Draggable Floating Action Button (aka. DFAB) can be created just like the Floating Action Button, but it also has a few cool features in addition.
The Draggable Floating Action Button (or DFAB), can be created just like the Floating Action Button, but it has a few features in addition:

You need to pass in an Offset object, to letting the button know where to position itself

You need to pass in the context and appBar of your application in order for the button to calculate correctly which where it has been dragged to across the application.

The data field works in a similar fashion it works in a Draggable widget
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