@adoratorio/hermes/dist/utils.js

A JS utility for scroll events normalization and management

import { DELTA_SCALE, DELTA_MODE, KEYCODE, } from './declarations';
const getDeltaMode = (mode) => DELTA_MODE[mode] || DELTA_MODE[0] || 1.0;
export function normalizeWheelDelta(event) {
    if ('deltaX' in event) {
        const mode = getDeltaMode(event.deltaMode);
        return {
            x: event.deltaX / DELTA_SCALE.STANDARD * mode,
            y: event.deltaY / DELTA_SCALE.STANDARD * mode,
        };
    }
    if ('wheelDeltaX' in event) {
        return {
            x: event.wheelDeltaX / DELTA_SCALE.OTHERS,
            y: event.wheelDeltaY / DELTA_SCALE.OTHERS,
        };
    }
    return {
        x: 0,
        y: event.wheelDelta / DELTA_SCALE.OTHERS,
    };
}
export function normalizeKeyDelta(keycode, multiplier = 1) {
    let delta = { x: 0, y: 0 };
    const m = (typeof multiplier === 'number' ? multiplier : multiplier[keycode]) || 1;
    switch (true) {
        case keycode === KEYCODE.SPACE:
            delta = { x: 0, y: window.innerHeight * m };
            break;
        case keycode === KEYCODE.DOWN:
            delta = { x: 0, y: 80 * m };
            break;
        case keycode === KEYCODE.UP:
            delta = { x: 0, y: -80 * m };
            break;
        case keycode === KEYCODE.RIGHT:
            delta = { x: 80 * m, y: 0 };
            break;
        case keycode === KEYCODE.LEFT:
            delta = { x: -80 * m, y: 0 };
            break;
        case keycode === KEYCODE.PAGEDOWN:
            delta = { x: 0, y: window.innerHeight * m };
            break;
        case keycode === KEYCODE.PAGEUP:
            delta = { x: 0, y: -window.innerHeight * m };
            break;
        case keycode === KEYCODE.PAGESTART:
            delta = { x: 0, y: -9999999 };
            break;
        case keycode === KEYCODE.PAGEEND:
            delta = { x: 0, y: 9999999 };
            break;
        default:
            delta = { x: 0, y: 0 };
    }
    return delta;
}
;
export function getTouch(list, id) {
    let found = undefined;
    for (let i = 0; i < list.length; i++) {
        if (list[i]?.identifier === id) {
            found = list[i];
            break;
        }
    }
    return found;
}
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