Support reordering with animation for programatic changes to the data source

[aytunch]

In my app, I don't need the user to reorder the contents but they are done when some filters are enabled.

Use case:

• Grids show cars.
• When user presses red color, I want to show only the red colored cars
• And I want this filtering to happen in an animated way.
• So there might be several cars that are removed from different places of the cars array.
• When the filter is removed, all cars should be added in place with ordering animation.

Can I use this package for this need?

This implicitly_animated_reorderable_list package does it using a diff algorithm

[casvanluijtelaar]

That's not really this packages' use case, so I don't think it's something I would add to the package itself. This package would a good base to start from. animating between two spots in the grid is already included you'd just have to replace the drag and drop behaviour to whatever controller you desire. If you think you can include it in an elegant, non interfering way, pull requests are always welcome!