@dvcol/common-utils
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Typescript library for common utility functions and constants
45 lines (38 loc) • 1.9 kB
JavaScript
;Object.defineProperty(exports, "__esModule", {value: true}); function _nullishCoalesce(lhs, rhsFn) { if (lhs != null) { return lhs; } else { return rhsFn(); } }// lib/common/utils/touch.utils.ts
var SwipeDirection = {
Up: "up",
Down: "down",
Left: "left",
Right: "right"
};
var ignoreSwipe = ({ start, end, ignore = true } = {}, axis = "x") => {
if (!start || !end || !ignore) return false;
return start[axis] !== end[axis];
};
var getDiff = (touch, scroll = {}) => {
const x = touch.start.clientX - touch.end.clientX;
const y = touch.start.clientY - touch.end.clientY;
if (!scroll.start || !scroll.end) return { x, y };
return {
x: x + (scroll.start.x - scroll.end.x),
y: y + (scroll.start.y - scroll.end.y)
};
};
var handleSwipeUpDown = ({ start, end }, { horizontal = 0, up = 20, down = 20 } = {}, scroll = {}) => {
if (!start || !end || ignoreSwipe(scroll, "y")) return;
const { x, y } = getDiff({ start, end }, scroll);
if (horizontal && Math.abs(x) >= horizontal) return;
if (y < -Math.abs(down)) return SwipeDirection.Down;
if (y > Math.abs(up)) return SwipeDirection.Up;
};
var handleSwipeLeftRight = ({ start, end }, { vertical = 0, left = 50, right = -50 } = {}, scroll = {}) => {
if (!start || !end || ignoreSwipe(scroll, "x")) return;
const { x, y } = getDiff({ start, end }, scroll);
if (vertical && Math.abs(y) >= vertical) return;
if (x < -Math.abs(right)) return SwipeDirection.Right;
if (x > Math.abs(left)) return SwipeDirection.Left;
};
var handleSwipe = (touch, tolerances = {}, scroll = {}) => {
return _nullishCoalesce(handleSwipeLeftRight(touch, tolerances, scroll), () => ( handleSwipeUpDown(touch, tolerances, scroll)));
};
exports.SwipeDirection = SwipeDirection; exports.handleSwipeUpDown = handleSwipeUpDown; exports.handleSwipeLeftRight = handleSwipeLeftRight; exports.handleSwipe = handleSwipe;