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Use Cell instead of RefCell

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This commit is contained in:
Anton Danilkin 2018-09-13 03:38:22 +03:00
parent 62b04e44c4
commit b9cc8e1270
1 changed files with 5 additions and 5 deletions
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10
examples/paint/src/lib.rs
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@ -2,7 +2,7 @@ extern crate js_sys;
extern crate wasm_bindgen; extern crate wasm_bindgen;
extern crate web_sys; extern crate web_sys;
use std::cell::RefCell; use std::cell::Cell;
use std::rc::Rc; use std::rc::Rc;
use wasm_bindgen::prelude::*; use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast; use wasm_bindgen::JsCast;
@ -32,14 +32,14 @@ pub fn main() {
.dyn_into::<web_sys::CanvasRenderingContext2d>() .dyn_into::<web_sys::CanvasRenderingContext2d>()
.unwrap(); .unwrap();
let context = Rc::new(context); let context = Rc::new(context);
let pressed = Rc::new(RefCell::new(false)); let pressed = Rc::new(Cell::new(false));
{ {
let context = context.clone(); let context = context.clone();
let pressed = pressed.clone(); let pressed = pressed.clone();
let closure: Closure<FnMut(_)> = Closure::new(move |event: web_sys::MouseEvent| { let closure: Closure<FnMut(_)> = Closure::new(move |event: web_sys::MouseEvent| {
context.begin_path(); context.begin_path();
context.move_to(event.offset_x() as f64, event.offset_y() as f64); context.move_to(event.offset_x() as f64, event.offset_y() as f64);
*pressed.borrow_mut() = true; pressed.set(true);
}); });
(canvas.as_ref() as &web_sys::EventTarget) (canvas.as_ref() as &web_sys::EventTarget)
.add_event_listener_with_callback("mousedown", closure.as_ref().unchecked_ref()) .add_event_listener_with_callback("mousedown", closure.as_ref().unchecked_ref())
@ -50,7 +50,7 @@ pub fn main() {
let context = context.clone(); let context = context.clone();
let pressed = pressed.clone(); let pressed = pressed.clone();
let closure: Closure<FnMut(_)> = Closure::new(move |event: web_sys::MouseEvent| { let closure: Closure<FnMut(_)> = Closure::new(move |event: web_sys::MouseEvent| {
if *pressed.borrow() { if pressed.get() {
context.line_to(event.offset_x() as f64, event.offset_y() as f64); context.line_to(event.offset_x() as f64, event.offset_y() as f64);
context.stroke(); context.stroke();
context.begin_path(); context.begin_path();
@ -66,7 +66,7 @@ pub fn main() {
let context = context.clone(); let context = context.clone();
let pressed = pressed.clone(); let pressed = pressed.clone();
let closure: Closure<FnMut(_)> = Closure::new(move |event: web_sys::MouseEvent| { let closure: Closure<FnMut(_)> = Closure::new(move |event: web_sys::MouseEvent| {
*pressed.borrow_mut() = false; pressed.set(false);
context.line_to(event.offset_x() as f64, event.offset_y() as f64); context.line_to(event.offset_x() as f64, event.offset_y() as f64);
context.stroke(); context.stroke();
}); });