Tooltip widget

[90-008]

This PR implements #460 as described in the issue. I have added a very simple example (definitely needs to be improved) to showcase the widget. I'm not sure about the widget name, since this acts as kind of a Container too. Or maybe the API could be done in a different way? I'd like to hear ideas about this.

Stuff to do:

• Improve the example
• Make the tooltip change position if it overflows a window edge to keep it visible

[hecrj]

We could consider extending Widget::overlay to also provide a cursor_position. This should allow us to remove the local State of the Tooltip.

I'll think about it!

[90-008]

Did that in b8c5ebc and added a overlay_content_bounds field. I need it to calculate where to put the tooltip (if tooltip_position is different than TooltipPosition::FollowCursor in Tooltip). There is probably a better way to do it (?), but that's what I do currently.

Edit: Could change overlay_content_bounds type to just Rectangle in Widget and use unwrap_or_else instead of map in UserInterface.

[clarkmoody]

I would love for this to have an overlay_mode enum that allows me to place it relative to the anchor element rather than flying with the cursor. This would mimic the data-placement directive for Bootstrap tooltip.

enum OverlayMode {
    WithCursor, // current behavior
    Top,
    Right,
    Bottom,
    Left,
}

Edit: Great job so far! The example program works for me.

[90-008]

I would love for this to have an overlay_mode enum that allows me to place it relative to the anchor element rather than flying with the cursor. This would mimic the data-placement directive for Bootstrap tooltip.

enum OverlayMode {
    WithCursor, // current behavior
    Top,
    Right,
    Bottom,
    Left,
}

Edit: Great job so far! The example program works for me.

Yep, that sounds like a good idea! I'll try implementing that when I have time.

[90-008]

I would love for this to have an overlay_mode enum that allows me to place it relative to the anchor element rather than flying with the cursor. This would mimic the data-placement directive for Bootstrap tooltip.

enum OverlayMode {
    WithCursor, // current behavior
    Top,
    Right,
    Bottom,
    Left,
}

Edit: Great job so far! The example program works for me.

Yep, that sounds like a good idea! I'll try implementing that when I have time.

https://streamable.com/3rsu4r video showcasing this! @clarkmoody

[clarkmoody]

https://streamable.com/3rsu4r video showcasing this! @clarkmoody

Oh yeah!

[hecrj]

Thank you for working on this! 🎉

I made some changes to restrict the API to text-only tooltips for the time being. As they are not interactive, we can avoid using the Widget::overlay method completely and simply use a Clip primitive in the renderer to produce a new layer.

I have also introduced gap, padding, and styling support (same as Container) and simplified the example a bit.

I think this is ready to go! We can improve it further in future iterations.