Trait sixtyfps_corelib::graphics::FontMetrics

pub trait FontMetrics {
    fn text_size(&self, text: &str, max_width: Option<f32>) -> Size;
    fn line_height(&self) -> f32;
    fn text_offset_for_x_position<'a>(&self, text: &'a str, x: f32) -> usize;
}

The FontMetrics trait is constructed from a FontRequest by the graphics backend and supplied to text related items in order to measure text.

Required methods

fn text_size(&self, text: &str, max_width: Option<f32>) -> Size

Returns the size of the given string in logical pixels. When set, max_width means that one need to wrap the text so it does not go further than that

fn line_height(&self) -> f32

Returns the height of a line of text.

fn text_offset_for_x_position<'a>(&self, text: &'a str, x: f32) -> usize

Returns the (UTF-8) byte offset in the given text that refers to the character that contributed to the glyph cluster that’s visually nearest to the given x coordinate. This is used for hit-testing, for example when receiving a mouse click into a text field. Then this function returns the “cursor” position.

Implementors