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Implement hidpi for web platform (#1233)

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* fix: use a 'static lifetime for the web backend's `Event` types

* implement hidpi for stdweb (web-sys wip?)

* fix: make all canvas resizes go through backend::set_canvas_size

* update Window docs for web, make `inner/outer_position` return the position in the viewport
This commit is contained in:
Michael Tang 2019-12-31 14:39:33 -08:00 • committed by Osspial
parent 28a20aec10
commit 777d9edeaa
11 changed files with 137 additions and 91 deletions
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25
src/platform_impl/web/web_sys/mod.rs
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@ -5,7 +5,7 @@ mod timeout;
pub use self::canvas::Canvas;
pub use self::timeout::Timeout;
use crate::dpi::LogicalSize;
use crate::dpi::{LogicalSize, Size};
use crate::platform::web::WindowExtWebSys;
use crate::window::Window;
use wasm_bindgen::{closure::Closure, JsCast};
@ -56,6 +56,29 @@ pub fn window_size() -> LogicalSize<f64> {
LogicalSize { width, height }
}
pub fn hidpi_factor() -> f64 {
let window = web_sys::window().expect("Failed to obtain window");
window.device_pixel_ratio()
}
pub fn set_canvas_size(raw: &HtmlCanvasElement, size: Size) {
let hidpi_factor = hidpi_factor();
let physical_size = size.to_physical::<u32>(hidpi_factor);
let logical_size = size.to_logical::<f64>(hidpi_factor);
raw.set_width(physical_size.width);
raw.set_height(physical_size.height);
let style = raw.style();
style
.set_property("width", &format!("{}px", logical_size.width))
.expect("Failed to set canvas width");
style
.set_property("height", &format!("{}px", logical_size.height))
.expect("Failed to set canvas height");
}
pub fn is_fullscreen(canvas: &HtmlCanvasElement) -> bool {
let window = window().expect("Failed to obtain window");
let document = window.document().expect("Failed to obtain document");