register Line Modifier Handler
fun registerLineModifierHandler(handler: (lineIndex: Int, modifier: TextBlock.LineModifier) -> Unit): TextBlock
Set the text block lines color chooser.
The handler function is called during the draw sequence, fot each line, to enable customizing each row.
If the modifier will overrider, per line, the global TextBlock settings like setForegroundColor
Return
this
Parameters
handler
a function that receives the line index and a LineModifier