react-virtualized/dist/commonjs/ColumnSizer/ColumnSizer.js

React components for efficiently rendering large, scrollable lists and tabular data

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _react = require('react');

var _reactAddonsShallowCompare = require('react-addons-shallow-compare');

var _reactAddonsShallowCompare2 = _interopRequireDefault(_reactAddonsShallowCompare);

var _Grid = require('../Grid');

var _Grid2 = _interopRequireDefault(_Grid);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

/**
 * High-order component that auto-calculates column-widths for `Grid` cells.
 */
var ColumnSizer = function (_Component) {
  _inherits(ColumnSizer, _Component);

  function ColumnSizer(props, context) {
    _classCallCheck(this, ColumnSizer);

    var _this = _possibleConstructorReturn(this, (ColumnSizer.__proto__ || Object.getPrototypeOf(ColumnSizer)).call(this, props, context));

    _this._registerChild = _this._registerChild.bind(_this);
    return _this;
  }

  _createClass(ColumnSizer, [{
    key: 'componentDidUpdate',
    value: function componentDidUpdate(prevProps, prevState) {
      var _props = this.props;
      var columnMaxWidth = _props.columnMaxWidth;
      var columnMinWidth = _props.columnMinWidth;
      var columnCount = _props.columnCount;
      var width = _props.width;


      if (columnMaxWidth !== prevProps.columnMaxWidth || columnMinWidth !== prevProps.columnMinWidth || columnCount !== prevProps.columnCount || width !== prevProps.width) {
        if (this._registeredChild) {
          this._registeredChild.recomputeGridSize();
        }
      }
    }
  }, {
    key: 'render',
    value: function render() {
      var _props2 = this.props;
      var children = _props2.children;
      var columnMaxWidth = _props2.columnMaxWidth;
      var columnMinWidth = _props2.columnMinWidth;
      var columnCount = _props2.columnCount;
      var width = _props2.width;


      var safeColumnMinWidth = columnMinWidth || 1;

      var safeColumnMaxWidth = columnMaxWidth ? Math.min(columnMaxWidth, width) : width;

      var columnWidth = width / columnCount;
      columnWidth = Math.max(safeColumnMinWidth, columnWidth);
      columnWidth = Math.min(safeColumnMaxWidth, columnWidth);
      columnWidth = Math.floor(columnWidth);

      var adjustedWidth = Math.min(width, columnWidth * columnCount);

      return children({
        adjustedWidth: adjustedWidth,
        getColumnWidth: function getColumnWidth() {
          return columnWidth;
        },
        registerChild: this._registerChild
      });
    }
  }, {
    key: 'shouldComponentUpdate',
    value: function shouldComponentUpdate(nextProps, nextState) {
      return (0, _reactAddonsShallowCompare2.default)(this, nextProps, nextState);
    }
  }, {
    key: '_registerChild',
    value: function _registerChild(child) {
      if (child !== null && !(child instanceof _Grid2.default)) {
        throw Error('Unexpected child type registered; only Grid children are supported.');
      }

      this._registeredChild = child;

      if (this._registeredChild) {
        this._registeredChild.recomputeGridSize();
      }
    }
  }]);

  return ColumnSizer;
}(_react.Component);

ColumnSizer.propTypes = {
  /**
   * Function respondible for rendering a virtualized Grid.
   * This function should implement the following signature:
   * ({ adjustedWidth, getColumnWidth, registerChild }) => PropTypes.element
   *
   * The specified :getColumnWidth function should be passed to the Grid's :columnWidth property.
   * The :registerChild should be passed to the Grid's :ref property.
   * The :adjustedWidth property is optional; it reflects the lesser of the overall width or the width of all columns.
   */
  children: _react.PropTypes.func.isRequired,

  /** Optional maximum allowed column width */
  columnMaxWidth: _react.PropTypes.number,

  /** Optional minimum allowed column width */
  columnMinWidth: _react.PropTypes.number,

  /** Number of columns in Grid or Table child */
  columnCount: _react.PropTypes.number.isRequired,

  /** Width of Grid or Table child */
  width: _react.PropTypes.number.isRequired
};
exports.default = ColumnSizer;