ListView: add support for multi-line items

[migueldeicaza-msft]

Better version that supports multi-line ListView items.

In this example, a custom renderer draws two-line items, and requires ListView.ItemHeight to be set to 2:

[migueldeicaza-msft]

Observation: perhaps we could make it so that ListWrapper has support for rendering multi-line text, so that folks do not need to implement a custom renderer for simple scenarios.

The RenderUstr could look for '\n' and use that to wrap around the text.

[cssmismi]

In the demo picture above, after selecting C: and hitting the up arrow, the contents of the lists changes and only 1 ListView item is visible.

[tig]

This is great.

All new features require two things missing from this PR though:

1. Unit tests
2. Sample code in a Scenario in UI Catalog. We are trying to deprecate demo.cs as it unstructured and doesn't scale as a way to discover samples.

Thanks.

[tig]

@migueldeicaza now that you have tons of time on your hands 😉, wanna look at the changes requested here so we can merge this?

[tig]

@migueldeicaza now that you have tons of time on your hands 😉, wanna look at the changes requested here so we can merge this?

I can't merge this until the requested changes are made...

[tig]

@migueldeicaza now that you have tons of time on your hands 😉, wanna look at the changes requested here so we can merge this?

I can't merge this until the requested changes are made...

@migueldeicaza - what's the chance you'll be able to address this anytime soon? Would you prefer one of the other maintainers take it on? I'd like to get this merged!

[migueldeicaza]

Happy to let someone look at it. I need to setup a .net development system again :-)

[tig]

Happy to let someone look at it. I need to setup a .net development system again :-)

I understand. I'll see if I can dive into this today.

[tig]

Dug in a little and this PR is far from ready:

• Issue @cssmismi pointed out above about selecting last item in list causing weird scroll behavior
• Demo code does not exercise code enuf to know it's all working. E.g. only 3 items and no scrolling. Are we sure scrolling is working?
• Mouse selection doesn't work right
• Needs demo code moved to a UI Catalog scenario
• No new unit tests

I'm going to mark this PR as draft. Hopefully myself or someone will find the time to address it.

[BDisp]

For now I have this like the image bellow but I want to add more features, like header, multi-columns, column alignment and row alignment.