Function getEdgeScrollDirections

src/cm/touchSelectionMenu.js:102–116

(options)

 * @returns {{horizontal:number, vertical:number}}
 */
export function getEdgeScrollDirections(options) {
	const { x, y, rect, allowHorizontal = true, gap = EDGE_SCROLL_GAP } = options;
	let horizontal = 0;
	let vertical = 0;

	if (allowHorizontal) {
		if (x < rect.left + gap) horizontal = -1;
		else if (x > rect.right - gap) horizontal = 1;
	}

	if (y < rect.top + gap) vertical = -1;
	else if (y > rect.bottom - gap) vertical = 1;

	return { horizontal, vertical };
}

function clamp(value, min, max) {
	return Math.max(min, Math.min(max, value));