iep-ui/es/image/getFixScaleEleTransPosition.js

An enterprise-class UI design language and Vue-based implementation

import _extends from 'babel-runtime/helpers/extends';
import _defineProperty from 'babel-runtime/helpers/defineProperty';
import { getClientSize } from '../vc-util/Dom/css';

function fixPoint(key, start, width, clientWidth) {
  var startAddWidth = start + width;
  var offsetStart = (width - clientWidth) / 2;

  if (width > clientWidth) {
    if (start > 0) {
      return _defineProperty({}, key, offsetStart);
    }
    if (start < 0 && startAddWidth < clientWidth) {
      return _defineProperty({}, key, -offsetStart);
    }
  } else if (start < 0 || startAddWidth > clientWidth) {
    return _defineProperty({}, key, start < 0 ? offsetStart : -offsetStart);
  } else {
    return {};
  }
}

export default function getFixScaleEleTransPosition(width, height, left, top) {
  var _getClientSize = getClientSize(),
      clientWidth = _getClientSize.width,
      clientHeight = _getClientSize.height;

  var fixPos = null;

  if (width <= clientWidth && height <= clientHeight) {
    fixPos = {
      x: 0,
      y: 0
    };
  } else if (width > clientWidth || height > clientHeight) {
    fixPos = _extends({}, fixPoint('x', left, width, clientWidth), fixPoint('y', top, height, clientHeight));
  }
  return fixPos;
}