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Stop appending canvas to document in web platform (#1089)

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* Stop appending canvas to document in web platform

* Remove `tabindex` TODO in web backend

* Return `OsError` instead of panicking on web canvas creation
This commit is contained in:
Héctor Ramón 2019-08-08 23:51:41 +02:00 committed by Hal Gentz
parent e897d70733
commit dbdde3d781
2 changed files with 18 additions and 17 deletions
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13
src/platform_impl/web/stdweb/canvas.rs
View file

@ -49,15 +49,14 @@ impl Canvas {
.try_into() .try_into()
.map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?; .map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?;
document() // A tabindex is needed in order to capture local keyboard events.
.body() // A "0" value means that the element should be focusable in
.ok_or_else(|| os_error!(OsError("Failed to find body node".to_owned())))? // sequential keyboard navigation, but its order is defined by the
.append_child(&canvas); // document's source order.
// https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex
// TODO: Set up unique ids
canvas canvas
.set_attribute("tabindex", "0") .set_attribute("tabindex", "0")
.expect("Failed to set a tabindex"); .map_err(|_| os_error!(OsError("Failed to set a tabindex".to_owned())))?;
Ok(Canvas { Ok(Canvas {
raw: canvas, raw: canvas,

22
src/platform_impl/web/web_sys/canvas.rs
View file

@ -34,24 +34,26 @@ impl Canvas {
where where
F: 'static + Fn(), F: 'static + Fn(),
{ {
let window = web_sys::window().expect("Failed to obtain window"); let window =
let document = window.document().expect("Failed to obtain document"); web_sys::window().ok_or(os_error!(OsError("Failed to obtain window".to_owned())))?;
let document = window
.document()
.ok_or(os_error!(OsError("Failed to obtain document".to_owned())))?;
let canvas: HtmlCanvasElement = document let canvas: HtmlCanvasElement = document
.create_element("canvas") .create_element("canvas")
.map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))? .map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?
.unchecked_into(); .unchecked_into();
document // A tabindex is needed in order to capture local keyboard events.
.body() // A "0" value means that the element should be focusable in
.ok_or_else(|| os_error!(OsError("Failed to find body node".to_owned())))? // sequential keyboard navigation, but its order is defined by the
.append_child(&canvas) // document's source order.
.map_err(|_| os_error!(OsError("Failed to append canvas".to_owned())))?; // https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex
// TODO: Set up unique ids
canvas canvas
.set_attribute("tabindex", "0") .set_attribute("tabindex", "0")
.expect("Failed to set a tabindex"); .map_err(|_| os_error!(OsError("Failed to set a tabindex".to_owned())))?;
Ok(Canvas { Ok(Canvas {
raw: canvas, raw: canvas,