Improved Label widget

[AndiHofi]

Hi there,

I would like to have a label widget with some extra features:

1. Highlight single characters (typically underline) to mark mnemonics
2. Control overflow behaviour - do not wrap, but render an ellipsis
3. Maybe have some extra state for mouse hover to allow showing a tooltip

Context: I plan to create an application that has to be fully controllable using the keyboard. I will start to create that widget myself.

[hecrj]

(1) and (2) are blocked by #33, as most text-related issues.

(3) can probably be achieved with the Tooltip widget.

[AndiHofi]

about (1) and (2) - I will work around that - get the positions based on grapheme clusters (using TextInput as inspiration), and then just draw a line so it approximates an underline for a single character. It may not look perfect and break apart with with some fonts or non-latin scripts, but it will be "good enough" for now.

about (3) - as far as I understood, the info if a widget is hovered is needed to display tooltips correctly - otherwise all tooltips would follow the mouse constantly. It may turn out that no such feature is needed, instead box the label (and related widget) into another container that has a "hovered" state

[danielstuart14]

I think not only for labels, but text overflow as a whole should be configurable. Currently, text seems to only wrap on white-spaces, so an overflow configuration could have 5 options:

• TextOverflow::WrapWords (default, wrap at whitespace)
• TextOverflow::WrapChars (wrap at char that would overflow, may break a word)
• TextOverflow::Clip (Clip text)
• TextOverflow::Ellipsis (Clip text and add ellipsis to it "...")
• TextOverflow::Allow (Allow for text to overflow, maintaining the text as it is)