pub type Measure<'a> = dyn FnMut(&TextContent, Option<f32>) -> (f32, f32) + 'a;Expand description
Callback that measures a text block:
(text, font_size, weight, wrap, max_width) -> (w, h).
Measures a text node to (width, height) given an optional max width. Takes
the whole TextContent so new text properties (family, spacing, style…)
don’t each widen this signature.