Support a widget.on_close() method

[adamltyson]

🚀 Feature

Support a method that is run when the widget is closed in napari.

Motivation

I want to mess with the viewer (hide buttons etc.), but reset everything if my plugin is closed.

Alternatives

Using viewer.window._qt_window.destroyed.connect(my_callback)

[tlambert03]

ahh... you what. I totally missed the part about this being just your widget (and not the full viewer). The need for a clear API is no different... but the workaround is a bit different (let me test some stuff)

[kevinyamauchi]

+1, this would be super useful to me as well!

[adamltyson]

My bad, I just blindly copied and pasted.

[goanpeca]

Hi @adamltyson, what do you exactly mean by closing a widget in napari 🙃 ?

• Clicking the x on the Dock? (This does not actually close a widget, just hides it)
• Selecting the Remove Dock Widgets from the Window Menu?

[adamltyson]

I originally meant clicking the x (didn't know it only hid the widget).

[sofroniewn]

This should be closed by #3184