mirror of
https://github.com/fluencelabs/wasm-bindgen
synced 2025-06-22 17:21:35 +00:00
5b76a6291e
This commit implements the first half of [RFC #5] where the `Deref` trait is implemented for all imported types. The target of `Deref` is either the first entry of the list of `extends` attribute or `JsValue`. All examples using `.as_ref()` with various `web-sys` types have been updated to the more ergonomic deref casts now. Additionally the `web-sys` generation of the `extends` array has been fixed slightly to explicitly list implementatoins in the hierarchy order to ensure the correct target for `Deref` is chosen. [RFC #5]: https://github.com/rustwasm/rfcs/blob/master/text/005-structural-and-deref.md
74 lines
2.4 KiB
Rust
74 lines
2.4 KiB
Rust
extern crate js_sys;
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extern crate wasm_bindgen;
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extern crate web_sys;
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use std::cell::Cell;
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use std::rc::Rc;
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use wasm_bindgen::prelude::*;
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use wasm_bindgen::JsCast;
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#[wasm_bindgen]
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pub fn main() -> Result<(), JsValue> {
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let document = web_sys::window().unwrap().document().unwrap();
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let canvas = document
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.create_element("canvas")?
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.dyn_into::<web_sys::HtmlCanvasElement>()?;
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document.body().unwrap().append_child(&canvas)?;
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canvas.set_width(640);
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canvas.set_height(480);
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canvas.style().set_property("border", "solid")?;
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let context = canvas
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.get_context("2d")?
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.unwrap()
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.dyn_into::<web_sys::CanvasRenderingContext2d>()?;
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let context = Rc::new(context);
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let pressed = Rc::new(Cell::new(false));
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{
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let context = context.clone();
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let pressed = pressed.clone();
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let closure = Closure::wrap(Box::new(move |event: web_sys::MouseEvent| {
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context.begin_path();
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context.move_to(event.offset_x() as f64, event.offset_y() as f64);
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pressed.set(true);
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}) as Box<FnMut(_)>);
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canvas.add_event_listener_with_callback(
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"mousedown",
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closure.as_ref().unchecked_ref(),
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)?;
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closure.forget();
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}
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{
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let context = context.clone();
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let pressed = pressed.clone();
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let closure = Closure::wrap(Box::new(move |event: web_sys::MouseEvent| {
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if pressed.get() {
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context.line_to(event.offset_x() as f64, event.offset_y() as f64);
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context.stroke();
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context.begin_path();
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context.move_to(event.offset_x() as f64, event.offset_y() as f64);
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}
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}) as Box<FnMut(_)>);
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canvas.add_event_listener_with_callback(
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"mousemove",
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closure.as_ref().unchecked_ref(),
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)?;
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closure.forget();
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}
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{
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let context = context.clone();
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let pressed = pressed.clone();
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let closure = Closure::wrap(Box::new(move |event: web_sys::MouseEvent| {
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pressed.set(false);
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context.line_to(event.offset_x() as f64, event.offset_y() as f64);
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context.stroke();
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}) as Box<FnMut(_)>);
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canvas.add_event_listener_with_callback(
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"mouseup",
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closure.as_ref().unchecked_ref(),
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)?;
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closure.forget();
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}
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Ok(())
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}
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