ngx-bootstrap-ci
Version:
Native Angular Bootstrap Components
54 lines (53 loc) • 8.98 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
import { getClientRect, getOuterSizes, getStyleComputedProperty } from '../utils';
/**
* @param {?} data
* @return {?}
*/
export function arrow(data) {
let /** @type {?} */ targetOffsets = data.offsets.target;
// if arrowElement is a string, suppose it's a CSS selector
const /** @type {?} */ arrowElement = data.instance.target.querySelector('.arrow');
// if arrowElement is not found, don't run the modifier
if (!arrowElement) {
return data;
}
const /** @type {?} */ isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
const /** @type {?} */ len = isVertical ? 'height' : 'width';
const /** @type {?} */ sideCapitalized = isVertical ? 'Top' : 'Left';
const /** @type {?} */ side = sideCapitalized.toLowerCase();
const /** @type {?} */ altSide = isVertical ? 'left' : 'top';
const /** @type {?} */ opSide = isVertical ? 'bottom' : 'right';
const /** @type {?} */ arrowElementSize = getOuterSizes(arrowElement)[len];
// top/left side
if (data.offsets.host[opSide] - arrowElementSize < targetOffsets[side]) {
targetOffsets[side] -=
targetOffsets[side] - (data.offsets.host[opSide] - arrowElementSize);
}
// bottom/right side
if (Number(data.offsets.host[side]) + Number(arrowElementSize) > targetOffsets[opSide]) {
targetOffsets[side] +=
Number(data.offsets.host[side]) + Number(arrowElementSize) - Number(targetOffsets[opSide]);
}
targetOffsets = getClientRect(targetOffsets);
// compute center of the target
const /** @type {?} */ center = Number(data.offsets.host[side]) + Number(data.offsets.host[len] / 2 - arrowElementSize / 2);
// Compute the sideValue using the updated target offsets
// take target margin in account because we don't have this info available
const /** @type {?} */ css = getStyleComputedProperty(data.instance.target);
const /** @type {?} */ targetMarginSide = parseFloat(css[`margin${sideCapitalized}`]);
const /** @type {?} */ targetBorderSide = parseFloat(css[`border${sideCapitalized}Width`]);
let /** @type {?} */ sideValue = center - targetOffsets[side] - targetMarginSide - targetBorderSide;
// prevent arrowElement from being placed not contiguously to its target
sideValue = Math.max(Math.min(targetOffsets[len] - arrowElementSize, sideValue), 0);
data.offsets.arrow = {
[side]: Math.round(sideValue),
[altSide]: '' // make sure to unset any eventual altSide value from the DOM node
};
data.instance.arrow = arrowElement;
return data;
}
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