Trait TextMeasurer 

pub trait TextMeasurer: 'static {
    // Required methods
    fn measure(&self, text: &str) -> TextMetrics;
    fn get_offset_for_position(&self, text: &str, x: f32, y: f32) -> usize;
    fn get_cursor_x_for_offset(&self, text: &str, offset: usize) -> f32;
    fn layout(&self, text: &str) -> TextLayoutResult;
}

Required Methods

fn measure(&self, text: &str) -> TextMetrics

fn get_offset_for_position(&self, text: &str, x: f32, y: f32) -> usize

Returns byte offset in text for given x position. Used for cursor positioning on click.

The y parameter is for future multiline support.

fn get_cursor_x_for_offset(&self, text: &str, offset: usize) -> f32

Returns x position for given byte offset. Used for cursor rendering and selection geometry.

fn layout(&self, text: &str) -> TextLayoutResult

Computes full text layout with cached glyph positions. Returns TextLayoutResult for O(1) position lookups.

Implementors