ngx-bootstrap-ci/positioning/esm5/modifiers/arrow.js

Native Angular Bootstrap Components

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes} checked by tsc
 */
import { getClientRect, getOuterSizes, getStyleComputedProperty } from '../utils';
/**
 * @param {?} data
 * @return {?}
 */
export function arrow(data) {
    var /** @type {?} */ targetOffsets = data.offsets.target;
    // if arrowElement is a string, suppose it's a CSS selector
    var /** @type {?} */ arrowElement = data.instance.target.querySelector('.arrow');
    // if arrowElement is not found, don't run the modifier
    if (!arrowElement) {
        return data;
    }
    var /** @type {?} */ isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
    var /** @type {?} */ len = isVertical ? 'height' : 'width';
    var /** @type {?} */ sideCapitalized = isVertical ? 'Top' : 'Left';
    var /** @type {?} */ side = sideCapitalized.toLowerCase();
    var /** @type {?} */ altSide = isVertical ? 'left' : 'top';
    var /** @type {?} */ opSide = isVertical ? 'bottom' : 'right';
    var /** @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
    var /** @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
    var /** @type {?} */ css = getStyleComputedProperty(data.instance.target);
    var /** @type {?} */ targetMarginSide = parseFloat(css["margin" + sideCapitalized]);
    var /** @type {?} */ targetBorderSide = parseFloat(css["border" + sideCapitalized + "Width"]);
    var /** @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 = (_a = {},
        _a[side] = Math.round(sideValue),
        _a[altSide] = '' // make sure to unset any eventual altSide value from the DOM node
    ,
        _a);
    data.instance.arrow = arrowElement;
    return data;
    var _a;
}

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