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import { GlBreakpointInstance as bp } from '@gitlab/ui/dist/utils';
import { SIDEBAR_COLLAPSED_CLASS } from './contextual_sidebar';
const HIDE_INTERVAL_TIMEOUT = 300;
const IS_OVER_CLASS = 'is-over';
const IS_ABOVE_CLASS = 'is-above';
const IS_SHOWING_FLY_OUT_CLASS = 'is-showing-fly-out';
let currentOpenMenu = null;
let menuCornerLocs;
let timeoutId;
let sidebar;
export const mousePos = [];
export const setSidebar = (el) => {
sidebar = el;
};
export const getOpenMenu = () => currentOpenMenu;
export const setOpenMenu = (menu = null) => {
currentOpenMenu = menu;
};
export const slope = (a, b) => (b.y - a.y) / (b.x - a.x);
let headerHeight = 50;
export const getHeaderHeight = () => headerHeight;
const setHeaderHeight = () => {
headerHeight = sidebar.offsetTop;
};
export const isSidebarCollapsed = () =>
sidebar && sidebar.classList.contains(SIDEBAR_COLLAPSED_CLASS);
export const canShowActiveSubItems = (el) => {
if (el.classList.contains('active') && !isSidebarCollapsed()) {
return false;
}
return true;
};
export const canShowSubItems = () => ['md', 'lg', 'xl'].includes(bp.getBreakpointSize());
export const getHideSubItemsInterval = () => {
if (!currentOpenMenu || !mousePos.length) return 0;
const currentMousePos = mousePos[mousePos.length - 1];
const prevMousePos = mousePos[0];
const currentMousePosY = currentMousePos.y;
const [menuTop, menuBottom] = menuCornerLocs;
if (currentMousePosY < menuTop.y || currentMousePosY > menuBottom.y) return 0;
if (
slope(prevMousePos, menuBottom) < slope(currentMousePos, menuBottom) &&
slope(prevMousePos, menuTop) > slope(currentMousePos, menuTop)
) {
return HIDE_INTERVAL_TIMEOUT;
}
return 0;
};
export const calculateTop = (boundingRect, outerHeight) => {
const windowHeight = window.innerHeight;
const bottomOverflow = windowHeight - (boundingRect.top + outerHeight);
return bottomOverflow < 0
? boundingRect.top - outerHeight + boundingRect.height
: boundingRect.top;
};
export const hideMenu = (el) => {
if (!el) return;
const parentEl = el.parentNode;
el.style.display = '';
el.style.transform = '';
el.classList.remove(IS_ABOVE_CLASS);
parentEl.classList.remove(IS_OVER_CLASS);
parentEl.classList.remove(IS_SHOWING_FLY_OUT_CLASS);
setOpenMenu();
};
export const moveSubItemsToPosition = (el, subItems) => {
const boundingRect = el.getBoundingClientRect();
const top = calculateTop(boundingRect, subItems.offsetHeight);
const left = sidebar ? sidebar.offsetWidth : 50;
const isAbove = top < boundingRect.top;
subItems.classList.add('fly-out-list');
subItems.style.transform = `translate3d(${left}px, ${Math.floor(top) - headerHeight}px, 0)`; // eslint-disable-line no-param-reassign
const subItemsRect = subItems.getBoundingClientRect();
menuCornerLocs = [
{
x: subItemsRect.left, // left position of the sub items
y: subItemsRect.top, // top position of the sub items
},
{
x: subItemsRect.left, // left position of the sub items
y: subItemsRect.top + subItemsRect.height, // bottom position of the sub items
},
];
if (isAbove) {
subItems.classList.add(IS_ABOVE_CLASS);
}
};
export const showSubLevelItems = (el) => {
const subItems = el.querySelector('.sidebar-sub-level-items');
const isIconOnly = subItems && subItems.classList.contains('is-fly-out-only');
if (!canShowSubItems() || !canShowActiveSubItems(el)) return;
el.classList.add(IS_OVER_CLASS);
if (!subItems || (!isSidebarCollapsed() && isIconOnly)) return;
subItems.style.display = 'block';
el.classList.add(IS_SHOWING_FLY_OUT_CLASS);
setOpenMenu(subItems);
moveSubItemsToPosition(el, subItems);
};
export const mouseEnterTopItems = (el, timeout = getHideSubItemsInterval()) => {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => {
if (currentOpenMenu) hideMenu(currentOpenMenu);
showSubLevelItems(el);
}, timeout);
};
export const mouseLeaveTopItem = (el) => {
const subItems = el.querySelector('.sidebar-sub-level-items');
if (
!canShowSubItems() ||
!canShowActiveSubItems(el) ||
(subItems && subItems === currentOpenMenu)
)
return;
el.classList.remove(IS_OVER_CLASS);
};
export const documentMouseMove = (e) => {
mousePos.push({
x: e.clientX,
y: e.clientY,
});
if (mousePos.length > 6) mousePos.shift();
};
export const subItemsMouseLeave = (relatedTarget) => {
clearTimeout(timeoutId);
if (relatedTarget && !relatedTarget.closest(`.${IS_OVER_CLASS}`)) {
hideMenu(currentOpenMenu);
}
};
export default () => {
sidebar = document.querySelector('.nav-sidebar');
if (!sidebar) return;
const items = [...sidebar.querySelectorAll('.sidebar-top-level-items > li')];
const topItems = sidebar.querySelector('.sidebar-top-level-items');
if (topItems) {
sidebar.querySelector('.sidebar-top-level-items').addEventListener('mouseleave', () => {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => {
if (currentOpenMenu) hideMenu(currentOpenMenu);
}, getHideSubItemsInterval());
});
}
requestIdleCallback(setHeaderHeight);
items.forEach((el) => {
const subItems = el.querySelector('.sidebar-sub-level-items');
if (subItems) {
subItems.addEventListener('mouseleave', (e) => subItemsMouseLeave(e.relatedTarget));
}
el.addEventListener('mouseenter', (e) => mouseEnterTopItems(e.currentTarget));
el.addEventListener('mouseleave', (e) => mouseLeaveTopItem(e.currentTarget));
});
document.addEventListener('mousemove', documentMouseMove);
};
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