Add support for ReorderableGridView.builder()

[renannery]

When dealing with a large list, it can get pretty slow while scrolling.

I understand the implementation is different and quite challenging, but something to consider support for better performance.

[karvulf]

Hello @renannery

Thank you for your feedback.
I will take a look to improve the performance. I have some ideas.

[karvulf]

I released a new release candidate for the version 2.0.0.
I added the implementations for all types of GridViews, including GridView.builder. This also improve the performance generally.

If you want to try that, you can use the version 2.0.0-dev.1.

@renannery

[renannery]

Thank you! I've just tested and apparently, the animation stopped working when items are moving position in the gridview.
In my implementation, there is no user interaction with drag-and-drop, the elements change their positions randomly according to our API and until version 1.1.5 it works just fine.

Switching to 2.0.0-dev.1 using the default constructor ReorderableGridView() the animation won't work

[karvulf]

Ah ok, this implementation is still in process.
Currently I only have rebuilt the drag and drop functionality.
The animation type is a bit more difficult, but if I am successfull, there will be another widget, that you can only use for that type of animation, sth like AnimatedReorderableGridView or both of them combined.
@renannery

[karvulf]

There is a new update for the release candidate.
I added the missing animation for all types in the GridView. For ReorderableWrap it is currently not supported.

You can test2.0.0-dev.2. There you also should have a better performance when using ReorderableGridView.builder.
@renannery

You can find more information about this update in the CHANGELOG.md.

[karvulf]

Hello @renannery
Today, I released the official version 2.0.0.
Now you have also support for GridView.builder. Check out the example too see more about that.