Resizing for the nodes.

[vzarytovskii]

Hey @WilliamKarolDiCioccio, first of all, thanks for the library, I am very new to both flutter and dart, and found it not only useful to me in my small pet project, but also a great source for the learning of Flutter libraries.

I would like to contribute to it and add a resizing support for the nodes, if it's something what is desired.

I, however, am quite new to GUI/client side programming in general and flutter in particular (I'm more of a compilers person), in case if it's something you would accept as a feature, here would be my approach to pursuing it:

1. Add dimensions to the Node (+ serialization/deserialization).
2. Add certain handlers to the _NodeWidgetState, such as _handleResizeStart, _handleResizeUpdate and _handleResizeEnd to handle/set the states of the widget.
3. Set certain default constraints on the minimal size of the node/widget.
4. Allow user to configure whether resizing is enabled or disabled and whether child widgets can/shall be resized together with the container.
5. Handle/cancel other user events which can occur (like cancelling selection event when node is resizing).

Again, if it's something you see fitting in the fl_nodes, I would be happy to bite a bullet and try implementing it, and will be grateful to any pointers or things I've missed.

Thanks in advance.

[WilliamKarolDiCioccio]

Thanks @vzarytovskii, that means the world to me!

I've never noticed it was possible to do it in most node editors (I just checked with blender and UE5). Sounds like a cool feature. I'm happy to let you collaborate to this project and to give you the possibility to practice your skills. If you plan on future contributions I can add you as a collaborator.

You seem to be on the right track with all the points you've made. A recommendation, mind the input handling, the edge might overlap with the ports and the program should distinguish what to do.

If you need help don't be afraid of asking here or even on the Discord server here (not that the server was born for fl_nodes but the two projects are strictly related), also the FlutterDev community is eager to help newcomers.

On an unrelated note:

1. Would you like to tell me more about your app?
2. You're not merely "more of a compiler person", you're CompilerMan 🦸. I had this idea of building a compiler myself in the back of my mind (never got past AST) for a while now. If that ever becomes a reality I know who to bother 😂

[vzarytovskii]

Great, thanks for the feedback and kind words, I will then try to start playing with it, might just straight submit a draft of changes and just go from there.

As for app - it's pretty much a canvas with ability to create and connect nodes, with ability to "run" a computation (as part of the node, can do some data fetching, maybe some other side-effects), (re)using data from the previous nodes, etc.

It's pretty much custom node editor, but with focus on textual data.