@bokeh/bokehjs
Version:
Interactive, novel data visualization
34 lines • 1.01 kB
JavaScript
/*!
* jQuery Mousewheel 3.1.13
*
* Copyright jQuery Foundation and other contributors
* Released under the MIT license
* http://jquery.org/license
*/
function fontSize(element) {
const value = getComputedStyle(element).fontSize;
const size = parseInt(value, 10);
return isNaN(size) ? null : size;
}
function lineHeight(element) {
const parent = element.offsetParent ?? document.body;
return fontSize(parent) ?? fontSize(element) ?? 16;
}
function pageHeight(element) {
return element.clientHeight; // XXX: should be content height?
}
export function getDeltaY(event) {
let deltaY = -event.deltaY;
if (event.target instanceof HTMLElement) {
switch (event.deltaMode) {
case event.DOM_DELTA_LINE:
deltaY *= lineHeight(event.target);
break;
case event.DOM_DELTA_PAGE:
deltaY *= pageHeight(event.target);
break;
}
}
return deltaY;
}
//# sourceMappingURL=wheel.js.map