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use super::{FontData, FontFamily, FontStyle, LayoutBox};
use wasm_bindgen::JsCast;
use web_sys::{window, HtmlElement};
#[derive(Debug, Clone)]
pub enum FontError {
UnknownError,
}
impl std::fmt::Display for FontError {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
match self {
_ => write!(fmt, "Unknown error"),
}
}
}
impl std::error::Error for FontError {}
#[derive(Clone)]
pub struct FontDataInternal(String, String);
impl FontData for FontDataInternal {
type ErrorType = FontError;
fn new(family: FontFamily, style: FontStyle) -> Result<Self, FontError> {
Ok(FontDataInternal(
family.as_str().into(),
style.as_str().into(),
))
}
fn estimate_layout(&self, size: f64, text: &str) -> Result<LayoutBox, Self::ErrorType> {
let window = window().unwrap();
let document = window.document().unwrap();
let body = document.body().unwrap();
let span = document.create_element("span").unwrap();
span.set_text_content(Some(text));
span.set_attribute("style", &format!("display: inline-block; font-family:{}; font-size: {}px; position: fixed; top: 100%", self.0, size)).unwrap();
let span = span.into();
body.append_with_node_1(&span).unwrap();
let elem = JsCast::dyn_into::<HtmlElement>(span).unwrap();
let height = elem.offset_height() as i32;
let width = elem.offset_width() as i32;
elem.remove();
Ok(((0, 0), (width, height)))
}
}
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