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Merge pull request #15959 from Snuffleupagus/normalizeWheelEventDelta-tweaks

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Tweak the `normalizeWheelEventDelta` helper function
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Jonas Jenwald 2023-01-25 11:13:50 +01:00 committed by GitHub
commit ce941255e2
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1 changed files with 3 additions and 4 deletions
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7
web/ui_utils.js
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@ -622,17 +622,16 @@ function normalizeWheelEventDirection(evt) {
} }
function normalizeWheelEventDelta(evt) { function normalizeWheelEventDelta(evt) {
const deltaMode = evt.deltaMode; // Avoid being affected by bug 1392460.
let delta = normalizeWheelEventDirection(evt); let delta = normalizeWheelEventDirection(evt);
const MOUSE_DOM_DELTA_PIXEL_MODE = 0;
const MOUSE_DOM_DELTA_LINE_MODE = 1;
const MOUSE_PIXELS_PER_LINE = 30; const MOUSE_PIXELS_PER_LINE = 30;
const MOUSE_LINES_PER_PAGE = 30; const MOUSE_LINES_PER_PAGE = 30;
// Converts delta to per-page units // Converts delta to per-page units
if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) { if (deltaMode === WheelEvent.DOM_DELTA_PIXEL) {
delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE; delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;
} else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) { } else if (deltaMode === WheelEvent.DOM_DELTA_LINE) {
delta /= MOUSE_LINES_PER_PAGE; delta /= MOUSE_LINES_PER_PAGE;
} }
return delta; return delta;