@rc-component/trigger/es/util.js

base abstract trigger component for react

function isPointsEq(a1 = [], a2 = [], isAlignPoint) {
  if (isAlignPoint) {
    return a1[0] === a2[0];
  }
  return a1[0] === a2[0] && a1[1] === a2[1];
}
export function getAlignPopupClassName(builtinPlacements, prefixCls, align, isAlignPoint) {
  const {
    points
  } = align;
  const placements = Object.keys(builtinPlacements);
  for (let i = 0; i < placements.length; i += 1) {
    const placement = placements[i];
    if (isPointsEq(builtinPlacements[placement]?.points, points, isAlignPoint)) {
      return `${prefixCls}-placement-${placement}`;
    }
  }
  return '';
}
export function getWin(ele) {
  return ele.ownerDocument.defaultView;
}

/**
 * Get all the scrollable parent elements of the element
 * @param ele       The element to be detected
 * @param areaOnly  Only return the parent which will cut visible area
 */
export function collectScroller(ele) {
  const scrollerList = [];
  let current = ele?.parentElement;
  const scrollStyle = ['hidden', 'scroll', 'clip', 'auto'];
  while (current) {
    const {
      overflowX,
      overflowY,
      overflow
    } = getWin(current).getComputedStyle(current);
    if ([overflowX, overflowY, overflow].some(o => scrollStyle.includes(o))) {
      scrollerList.push(current);
    }
    current = current.parentElement;
  }
  return scrollerList;
}
export function toNum(num, defaultValue = 1) {
  return Number.isNaN(num) ? defaultValue : num;
}
function getPxValue(val) {
  return toNum(parseFloat(val), 0);
}
/**
 *
 *
 *  **************************************
 *  *              Border                *
 *  *     **************************     *
 *  *     *                  *     *     *
 *  *  B  *                  *  S  *  B  *
 *  *  o  *                  *  c  *  o  *
 *  *  r  *      Content     *  r  *  r  *
 *  *  d  *                  *  o  *  d  *
 *  *  e  *                  *  l  *  e  *
 *  *  r  ********************  l  *  r  *
 *  *     *        Scroll          *     *
 *  *     **************************     *
 *  *              Border                *
 *  **************************************
 *
 */
/**
 * Get visible area of element
 */
export function getVisibleArea(initArea, scrollerList) {
  const visibleArea = {
    ...initArea
  };
  (scrollerList || []).forEach(ele => {
    if (ele instanceof HTMLBodyElement || ele instanceof HTMLHtmlElement) {
      return;
    }

    // Skip if static position which will not affect visible area
    const {
      overflow,
      overflowClipMargin,
      borderTopWidth,
      borderBottomWidth,
      borderLeftWidth,
      borderRightWidth
    } = getWin(ele).getComputedStyle(ele);
    const eleRect = ele.getBoundingClientRect();
    const {
      offsetHeight: eleOutHeight,
      clientHeight: eleInnerHeight,
      offsetWidth: eleOutWidth,
      clientWidth: eleInnerWidth
    } = ele;
    const borderTopNum = getPxValue(borderTopWidth);
    const borderBottomNum = getPxValue(borderBottomWidth);
    const borderLeftNum = getPxValue(borderLeftWidth);
    const borderRightNum = getPxValue(borderRightWidth);
    const scaleX = toNum(Math.round(eleRect.width / eleOutWidth * 1000) / 1000);
    const scaleY = toNum(Math.round(eleRect.height / eleOutHeight * 1000) / 1000);

    // Original visible area
    const eleScrollWidth = (eleOutWidth - eleInnerWidth - borderLeftNum - borderRightNum) * scaleX;
    const eleScrollHeight = (eleOutHeight - eleInnerHeight - borderTopNum - borderBottomNum) * scaleY;

    // Cut border size
    const scaledBorderTopWidth = borderTopNum * scaleY;
    const scaledBorderBottomWidth = borderBottomNum * scaleY;
    const scaledBorderLeftWidth = borderLeftNum * scaleX;
    const scaledBorderRightWidth = borderRightNum * scaleX;

    // Clip margin
    let clipMarginWidth = 0;
    let clipMarginHeight = 0;
    if (overflow === 'clip') {
      const clipNum = getPxValue(overflowClipMargin);
      clipMarginWidth = clipNum * scaleX;
      clipMarginHeight = clipNum * scaleY;
    }

    // Region
    const eleLeft = eleRect.x + scaledBorderLeftWidth - clipMarginWidth;
    const eleTop = eleRect.y + scaledBorderTopWidth - clipMarginHeight;
    const eleRight = eleLeft + eleRect.width + 2 * clipMarginWidth - scaledBorderLeftWidth - scaledBorderRightWidth - eleScrollWidth;
    const eleBottom = eleTop + eleRect.height + 2 * clipMarginHeight - scaledBorderTopWidth - scaledBorderBottomWidth - eleScrollHeight;
    visibleArea.left = Math.max(visibleArea.left, eleLeft);
    visibleArea.top = Math.max(visibleArea.top, eleTop);
    visibleArea.right = Math.min(visibleArea.right, eleRight);
    visibleArea.bottom = Math.min(visibleArea.bottom, eleBottom);
  });
  return visibleArea;
}