nsn-comp/es/comps/ellipsis/_util/computeLine.js

NSN核心组件

import { NConst } from 'nsn-const';
import { bisection } from './bisection';
var isSupportLineClamp = document.body.style.webkitLineClamp !== undefined;

var computeLine = function computeLine(comp, elements) {
  var lines = comp.props.lines;
  var normal = elements.normal,
      shadow = elements.shadow,
      contentContainer = elements.contentContainer,
      content = elements.content;

  if (lines && !isSupportLineClamp) {
    var _ref = normal || {},
        innerText = _ref.innerText,
        textContent = _ref.textContent,
        _ref$offsetHeight = _ref.offsetHeight,
        totalHeight = _ref$offsetHeight === void 0 ? 0 : _ref$offsetHeight;

    var text = innerText || textContent || NConst.EMPTY;
    var textLength = text.length;
    var lineHeight = contentContainer ? parseInt(getComputedStyle(contentContainer).lineHeight, 10) : 10;
    var targetHeight = lines * lineHeight;

    if (content) {
      content.style.height = "".concat(targetHeight, "px");
    }

    if (totalHeight <= targetHeight) {
      comp.setState({
        text: text,
        targetCount: textLength
      });
      return;
    } // bisection


    var _ref2 = shadow || {},
        firstElementChild = _ref2.firstElementChild;

    var shadowNode = firstElementChild;
    var targetCount = bisection({
      targetHeight: targetHeight,
      text: text,
      shadowNode: shadowNode,
      midIndex: Math.ceil(textLength / 2),
      beginIndex: 0,
      endIndex: textLength
    });
    comp.setState({
      text: text,
      targetCount: targetCount
    });
  }
};

export { computeLine };