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js: Distinguish manual resizes from device pixel ratio changes

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This adds a new callback, rescale_puzzle(), that's called when the
device pixel ratio changes.  This means that resize_puzzle() can safely
set the nominal canvas size, which means that manual resizing of the
puzzle now sticks.

Still missing: paying attention to the device pixel ratio when choosing
the initial (or reset) size.
This commit is contained in:
Ben Harris
2022-10-27 14:30:23 +01:00
parent 9783bbfbc0
commit fa58dd85b7
3 changed files with 14 additions and 3 deletions
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4
emccpre.js
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@ -535,12 +535,14 @@ function initPuzzle() {
* <https://developer.mozilla.org/en-US/docs/Web/API/Window/
* devicePixelRatio> (CC0) to work on older browsers.
*/
var rescale_puzzle = Module.cwrap('rescale_puzzle',
'void', ['number', 'number']);
var mql = null;
var update_pixel_ratio = function() {
var dpr = window.devicePixelRatio;
if (mql !== null)
mql.removeListener(update_pixel_ratio);
resize_puzzle(nominal_width * dpr, nominal_height * dpr);
rescale_puzzle(nominal_width * dpr, nominal_height * dpr);
mql = window.matchMedia(`(resolution: ${dpr}dppx)`);
mql.addListener(update_pixel_ratio);
}