How is the NodeToolBar designed?

[lock4u]

I do not understand why nodetoolbar need is-visible props! How dose it works
and how to dynamic the nodetoolbar position

[bcakmakoglu]

I do not understand why nodetoolbar need is-visible props!

What's the question here? It doesn't need it, it's there to allow for more flexibility and control when the toolbar is supposed to be visible.

How does it work?

Look into the source code if you want to know about that.

and how to dynamic the nodetoolbar position

Read the docs and look at the example for the toolbar.