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js: Make update_pixel_ratio more backward-compatible

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Despite my stylistic downgrades, it still used two features not present
in Firefox 48, and hence KaiOS 2.5: passing options to addEventListener,
and calling addEventListener on a MediaQueryList at all.  Now it uses
the older addListener method and explicitly removes each listener as
soon as it's called.
This commit is contained in:
Ben Harris
2022-10-26 21:17:21 +01:00
parent 7354790ca4
commit 6f5debe417
1 changed files with 6 additions and 3 deletions
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9
emccpre.js
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@ -527,13 +527,16 @@ function initPuzzle() {
/*
* Arrange to detect changes of device pixel ratio. Adapted from
* <https://developer.mozilla.org/en-US/docs/Web/API/Window/
* devicePixelRatio> (CC0).
* devicePixelRatio> (CC0) to work on older browsers.
*/
var mql = null;
var update_pixel_ratio = function() {
var dpr = window.devicePixelRatio;
if (mql !== null)
mql.removeListener(update_pixel_ratio);
resizable_div.style.width = onscreen_canvas.width / dpr + "px";
matchMedia(`(resolution: ${dpr}dppx)`)
.addEventListener("change", update_pixel_ratio, { once: true })
mql = window.matchMedia(`(resolution: ${dpr}dppx)`);
mql.addListener(update_pixel_ratio);
}
update_pixel_ratio();