How to draw centred text using GlyphCache

[AleCamara]

I'm finding it hard to draw text centred around a point in the screen.

GlyphCache is probably too low-level to offer this functionality directly, but it could help with a

calculate_text_width(&self, text: &str, size: FontSize) -> Scalar

method to calculate the expected width of a given text and font size. How do you feel about this?

I'm currently exploring the avenue of preloading all chars of the text, then getting the character with opt_character(), and using advance_width() to calculate the final width.

pub fn calculate_text_width<'a>(text: &str, font_size: FontSize, glyphs: &'a GlyphCache) -> f32 {
    let mut w = 0.0;
    glyphs.preload_chars(font_size, text.chars());
    for c in text.chars() {
        if let Some(ch) = glyphs.opt_character(font_size, c) {
            w += ch.advance_width() as f32;
        }
    }
    w
}

But this feels cumbersome, and something so useful that should be provided by the library directly, no?