@elastic/eui
Version:
Elastic UI Component Library
119 lines (115 loc) • 6.23 kB
JavaScript
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
var getVisibleArea = function getVisibleArea(bounds, windowWidth, windowHeight) {
var left = bounds.left,
top = bounds.top,
width = bounds.width,
height = bounds.height;
// This is a common algorithm for finding the intersected area among two rectangles.
var dx = Math.min(left + width, windowWidth) - Math.max(left, 0);
var dy = Math.min(top + height, windowHeight) - Math.max(top, 0);
return dx * dy;
};
var positionAtTop = function positionAtTop(anchorBounds, width, height, buffer) {
var widthDifference = width - anchorBounds.width;
var left = anchorBounds.left - widthDifference * 0.5;
var top = anchorBounds.top - height - buffer;
return {
left: left,
top: top,
width: width,
height: height
};
};
var positionAtRight = function positionAtRight(anchorBounds, width, height, buffer) {
var left = anchorBounds.right + buffer;
var heightDifference = height - anchorBounds.height;
var top = anchorBounds.top - heightDifference * 0.5;
return {
left: left,
top: top,
width: width,
height: height
};
};
var positionAtBottom = function positionAtBottom(anchorBounds, width, height, buffer) {
var widthDifference = width - anchorBounds.width;
var left = anchorBounds.left - widthDifference * 0.5;
var top = anchorBounds.bottom + buffer;
return {
left: left,
top: top,
width: width,
height: height
};
};
var positionAtLeft = function positionAtLeft(anchorBounds, width, height, buffer) {
var left = anchorBounds.left - width - buffer;
var heightDifference = height - anchorBounds.height;
var top = anchorBounds.top - heightDifference * 0.5;
return {
left: left,
top: top,
width: width,
height: height
};
};
var positionToPositionerMap = {
top: positionAtTop,
right: positionAtRight,
bottom: positionAtBottom,
left: positionAtLeft
};
/**
* Determine the best position for a popover that avoids clipping by the window view port.
*
* @param {Object} anchorBounds - getBoundingClientRect() of the node the popover is tethered to (e.g. a button).
* @param {Object} popoverBounds - getBoundingClientRect() of the popover node (e.g. the tooltip).
* @param {string} requestedPosition - Position the user wants. One of ["top", "right", "bottom", "left"]
* @param {number} buffer - The space between the wrapper and the popover. Also the minimum space between the
* popover and the window.
* @param {Array} positions - List of acceptable positions. Defaults to ["top", "right", "bottom", "left"].
*
* @returns {Object} With properties position (one of ["top", "right", "bottom", "left"]), left, top, width, and height.
*/
export function calculatePopoverPosition(anchorBounds, popoverBounds, requestedPosition) {
var buffer = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 16;
var positions = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : ['top', 'right', 'bottom', 'left'];
if (typeof buffer !== 'number') {
throw new Error("calculatePopoverPosition received a buffer argument of ".concat(buffer, "' but expected a number"));
}
var windowWidth = window.innerWidth;
var windowHeight = window.innerHeight;
var popoverWidth = popoverBounds.width,
popoverHeight = popoverBounds.height;
var positionToBoundsMap = {};
var positionToVisibleAreaMap = {};
positions.forEach(function (position) {
var bounds = positionToPositionerMap[position](anchorBounds, popoverWidth, popoverHeight, buffer);
positionToBoundsMap[position] = bounds;
// Calculate how much area of the popover is visible at each position.
positionToVisibleAreaMap[position] = getVisibleArea(bounds, windowWidth, windowHeight);
});
// If the requested position clips the popover, find the position which clips the popover the least.
// Default to use the requested position.
var calculatedPopoverPosition = positions.reduce(function (mostVisiblePosition, position) {
if (positionToVisibleAreaMap[position] > positionToVisibleAreaMap[mostVisiblePosition]) {
return position;
}
return mostVisiblePosition;
}, requestedPosition);
return _objectSpread({
position: calculatedPopoverPosition
}, positionToBoundsMap[calculatedPopoverPosition]);
}