core/src/text.rs


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//! Draw and interact with text.
use crate::Vector;

/// The result of hit testing on text.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Hit {
    /// The point was within the bounds of the returned character index.
    CharOffset(usize),
    /// The provided point was not within the bounds of a glyph. The index
    /// of the character with the closest centeroid position is returned,
    /// as well as its delta.
    NearestCharOffset(usize, Vector),
}

impl Hit {
    /// Computes the cursor position corresponding to this [`HitTestResult`] .
    pub fn cursor(self) -> usize {
        match self {
            Self::CharOffset(i) => i,
            Self::NearestCharOffset(i, delta) => {
                if delta.x > f32::EPSILON {
                    i + 1
                } else {
                    i
                }
            }
        }
    }
}