1 files changed, 46 insertions, 0 deletions
diff --git a/src/style/font/web.rs b/src/style/font/web.rs
new file mode 100644
index 0000000..e70e7b1
--- /dev/null
+++ b/src/style/font/web.rs
@@ -0,0 +1,46 @@
+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)))
+    }
+}