Druid: Scrollbar cannot be interacted with

[ForLoveOfCats]

When running the scroll example on Linux with the just merged GTK support the scrollbar cannot be interacted with. It appears and fades away correctly, just cannot be clicked on and dragged.

[ForLoveOfCats]

I've been following both Xi and Druid for a while, I would like to take this as an opportunity to contribute in a somewhat substantial way as I have a great deal of interest in Druid on Linux.

[cmyr]

This is actually an issue with the scroll widget itself I believe, but this is definitely something we'll want to fix!

[ForLoveOfCats]

Ah! I'm going to take a look, anything to look out for?

[cmyr]

I suspect there will be some subtlety with tracking the mouse, but I would just start poking around in src/widget/scroll.rs and seeing how things are wired up.

[ForLoveOfCats]

So I see that a widget's input handling is done in the event function part of the Widget<T> trait and that the Scroll<T> widget does not handle any Event::MouseDown/Event::MouseUp events. Is this the only location where these scrollbars will ever be thus these should be handled by Scroll<T> or should the scrollbars instead be broken out into a separate widget handling this independently?

Has dragging on the scrollbars ever worked or is this a new feature?

[raphlinus]

This is a new feature. I think just implementing mouse events in Scroll<T> is probably the way to go for now. It's certainly possible to imagine breaking it out into smaller composable widgets, but it's not immediately obvious how that should go.

[ForLoveOfCats]

Copy that!

[zaynetro]

Scroll bars added in #142 . Would love to see mouse support!