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m: Cache document in web frontend (#66)

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John Nunley 2023-01-14 05:48:44 +00:00 • committed by GitHub
parent 125ad070c2
commit 33a4c3741b
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 27 additions and 11 deletions
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8
src/lib.rs
View file

@ -93,7 +93,7 @@ make_dispatch! {
#[cfg(target_os = "macos")]
CG((), cg::CGImpl),
#[cfg(target_arch = "wasm32")]
Web((), web::WebImpl),
Web(web::WebDisplayImpl, web::WebImpl),
#[cfg(target_os = "redox")]
Orbital((), orbital::OrbitalImpl),
}
@ -134,7 +134,7 @@ impl Context {
#[cfg(target_os = "macos")]
RawDisplayHandle::AppKit(_) => ContextDispatch::CG(()),
#[cfg(target_arch = "wasm32")]
RawDisplayHandle::Web(_) => ContextDispatch::Web(()),
RawDisplayHandle::Web(_) => ContextDispatch::Web(web::WebDisplayImpl::new()?),
#[cfg(target_os = "redox")]
RawDisplayHandle::Orbital(_) => ContextDispatch::Orbital(()),
unimplemented_display_handle => {
@ -212,8 +212,8 @@ impl Surface {
SurfaceDispatch::CG(unsafe { cg::CGImpl::new(appkit_handle)? })
}
#[cfg(target_arch = "wasm32")]
(ContextDispatch::Web(()), RawWindowHandle::Web(web_handle)) => {
SurfaceDispatch::Web(web::WebImpl::new(web_handle)?)
(ContextDispatch::Web(context), RawWindowHandle::Web(web_handle)) => {
SurfaceDispatch::Web(web::WebImpl::new(context, web_handle)?)
}
#[cfg(target_os = "redox")]
(ContextDispatch::Orbital(()), RawWindowHandle::Orbital(orbital_handle)) => {

30
src/web.rs
View file

@ -7,14 +7,16 @@ use web_sys::ImageData;
use crate::SoftBufferError;
pub struct WebImpl {
canvas: HtmlCanvasElement,
ctx: CanvasRenderingContext2d,
/// Display implementation for the web platform.
///
/// This just caches the document to prevent having to query it every time.
pub struct WebDisplayImpl {
document: web_sys::Document,
}
impl WebImpl {
pub fn new(handle: WebWindowHandle) -> Result<Self, SoftBufferError> {
let canvas: HtmlCanvasElement = web_sys::window()
impl WebDisplayImpl {
pub(super) fn new() -> Result<Self, SoftBufferError> {
let document = web_sys::window()
.ok_or_else(|| {
SoftBufferError::PlatformError(
Some("`window` is not present in this runtime".into()),
@ -27,7 +29,21 @@ impl WebImpl {
Some("`document` is not present in this runtime".into()),
None,
)
})?
})?;
Ok(Self { document })
}
}
pub struct WebImpl {
canvas: HtmlCanvasElement,
ctx: CanvasRenderingContext2d,
}
impl WebImpl {
pub fn new(display: &WebDisplayImpl, handle: WebWindowHandle) -> Result<Self, SoftBufferError> {
let canvas: HtmlCanvasElement = display
.document
.query_selector(&format!("canvas[data-raw-handle=\"{}\"]", handle.id))
// `querySelector` only throws an error if the selector is invalid.
.unwrap()