@popperjs/core
Version:
Tooltip and Popover Positioning Engine
80 lines (67 loc) • 3.05 kB
JavaScript
import getBasePlacement from "../utils/getBasePlacement.js";
import getLayoutRect from "../dom-utils/getLayoutRect.js";
import contains from "../dom-utils/contains.js";
import getMainAxisFromPlacement from "../utils/getMainAxisFromPlacement.js";
import within from "../utils/within.js";
import mergePaddingObject from "../utils/mergePaddingObject.js";
import expandToHashMap from "../utils/expandToHashMap.js";
import { left, right, basePlacements, top, bottom } from "../enums.js";
function arrow(_ref) {
var _state$modifiersData$;
var state = _ref.state,
name = _ref.name;
var arrowElement = state.elements.arrow;
var popperOffsets = state.modifiersData.popperOffsets;
var basePlacement = getBasePlacement(state.placement);
var axis = getMainAxisFromPlacement(basePlacement);
var isVertical = [left, right].indexOf(basePlacement) >= 0;
var len = isVertical ? 'height' : 'width';
if (!arrowElement) {
return;
}
var paddingObject = state.modifiersData[name + "#persistent"].padding;
var arrowRect = getLayoutRect(arrowElement);
var minProp = axis === 'y' ? top : left;
var maxProp = axis === 'y' ? bottom : right;
var endDiff = state.rects.reference[len] + state.rects.reference[axis] - popperOffsets[axis] - state.rects.popper[len];
var startDiff = popperOffsets[axis] - state.rects.reference[axis];
var centerToReference = endDiff / 2 - startDiff / 2; // Make sure the arrow doesn't overflow the popper if the center point is
// outside of the popper bounds
var center = within(paddingObject[minProp], state.rects.popper[len] / 2 - arrowRect[len] / 2 + centerToReference, state.rects.popper[len] - arrowRect[len] - paddingObject[maxProp]); // Prevents breaking syntax highlighting...
var axisProp = axis;
state.modifiersData[name] = (_state$modifiersData$ = {}, _state$modifiersData$[axisProp] = center, _state$modifiersData$);
}
function effect(_ref2) {
var state = _ref2.state,
options = _ref2.options,
name = _ref2.name;
var _options$element = options.element,
arrowElement = _options$element === void 0 ? '[data-popper-arrow]' : _options$element,
_options$padding = options.padding,
padding = _options$padding === void 0 ? 0 : _options$padding; // CSS selector
if (typeof arrowElement === 'string') {
arrowElement = state.elements.popper.querySelector(arrowElement);
if (!arrowElement) {
return;
}
}
if (!contains(state.elements.popper, arrowElement)) {
if (process.env.NODE_ENV !== "production") {
console.error(['Popper: "arrow" modifier\'s `element` must be a child of the popper', 'element.'].join(' '));
}
return;
}
state.elements.arrow = arrowElement;
state.modifiersData[name + "#persistent"] = {
padding: mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements))
};
}
export default {
name: 'arrow',
enabled: true,
phase: 'main',
fn: arrow,
effect: effect,
requires: ['popperOffsets'],
requiresIfExists: ['preventOverflow']
};