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Stable mousewheel scrolling, one wheel up + one wheel down = no change (#1131)

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Adam Burgess
2021-08-24 23:52:25 +10:00
committed by GitHub
parent 14c3d190e9
commit b74788e036
1 changed files with 5 additions and 1 deletions
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6
src/client/lazy-app/Compress/Output/custom-els/PinchZoom/index.ts
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@@ -300,9 +300,13 @@ export default class PinchZoom extends HTMLElement {
deltaY *= 15; deltaY *= 15;
} }
const zoomingOut = deltaY > 0;
// ctrlKey is true when pinch-zooming on a trackpad. // ctrlKey is true when pinch-zooming on a trackpad.
const divisor = ctrlKey ? 100 : 300; const divisor = ctrlKey ? 100 : 300;
const scaleDiff = 1 - deltaY / divisor; // when zooming out, invert the delta and the ratio to keep zoom stable
const ratio = 1 - (zoomingOut ? -deltaY : deltaY) / divisor;
const scaleDiff = zoomingOut ? 1 / ratio : ratio;
this._applyChange({ this._applyChange({
scaleDiff, scaleDiff,