dragon-mobile-ui/lib/_CascaderPicker/Picker.js

UI for react.js

'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 _propTypes = require('prop-types');

var _propTypes2 = _interopRequireDefault(_propTypes);

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _classnames = require('classnames');

var _classnames2 = _interopRequireDefault(_classnames);

var _zscroller = require('zscroller');

var _zscroller2 = _interopRequireDefault(_zscroller);

var _isChildrenEqual = require('./isChildrenEqual');

var _isChildrenEqual2 = _interopRequireDefault(_isChildrenEqual);

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

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return 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; }

var Picker = function (_Component) {
  _inherits(Picker, _Component);

  function Picker(props) {
    _classCallCheck(this, Picker);

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

    var selectedValueState = void 0;
    var _this$props = _this.props,
        selectedValue = _this$props.selectedValue,
        defaultSelectedValue = _this$props.defaultSelectedValue,
        children = _this$props.children;


    if (selectedValue !== undefined) {
      selectedValueState = selectedValue;
    } else if (defaultSelectedValue !== undefined) {
      selectedValueState = defaultSelectedValue;
    } else if (children && children.length) {
      selectedValueState = children[0].value;
    }
    _this.state = {
      selectedValue: selectedValueState
    };
    return _this;
  }

  _createClass(Picker, [{
    key: 'componentDidMount',
    value: function componentDidMount() {
      this.itemHeight = this.refs.indicator.offsetHeight;
      // compact
      this.refs.content.style.padding = this.itemHeight * 3 + 'px 0';
      this.zscroller = new _zscroller2.default(this.refs.content, {
        scrollingX: false,
        snapping: true,
        penetrationDeceleration: 0.1,
        minVelocityToKeepDecelerating: 0.5,
        scrollingComplete: this.scrollingComplete.bind(this)
      });

      this.zscroller.setDisabled(this.props.disabled);
      this.zscroller.scroller.setSnapSize(0, this.itemHeight);
      this.select(this.state.selectedValue);
    }
  }, {
    key: 'componentWillReceiveProps',
    value: function componentWillReceiveProps(nextProps) {
      if ('selectedValue' in nextProps) {
        this.setState({
          selectedValue: nextProps.selectedValue
        });
      }
      this.zscroller.setDisabled(nextProps.disabled);
    }
  }, {
    key: 'shouldComponentUpdate',
    value: function shouldComponentUpdate(nextProps, nextState) {
      return this.state.selectedValue !== nextState.selectedValue || !(0, _isChildrenEqual2.default)(this.props.children, nextProps.children, this.props.pure);
    }
  }, {
    key: 'componentDidUpdate',
    value: function componentDidUpdate() {
      this.zscroller.reflow();
      this.select(this.state.selectedValue);
    }
  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      this.zscroller.destroy();
    }
  }, {
    key: 'getChildMember',
    value: function getChildMember(child, m) {
      return child[m];
    }
  }, {
    key: 'getValue',
    value: function getValue() {
      return this.props.selectedValue || this.props.children && this.props.children[0] && this.props.children[0].value;
    }
  }, {
    key: 'scrollingComplete',
    value: function scrollingComplete() {
      var _zscroller$scroller$g = this.zscroller.scroller.getValues(),
          top = _zscroller$scroller$g.top;

      if (top >= 0) {
        this.doScrollingComplete(top);
      }
    }
  }, {
    key: 'fireValueChange',
    value: function fireValueChange(selectedValue) {
      if (selectedValue !== this.state.selectedValue) {
        if (!('selectedValue' in this.props)) {
          this.setState({
            selectedValue: selectedValue
          });
        }

        this.props.onValueChange(selectedValue);
      }
    }
  }, {
    key: 'scrollTo',
    value: function scrollTo(top) {
      this.zscroller.scroller.scrollTo(0, top);
    }
  }, {
    key: 'toChildrenArray',
    value: function toChildrenArray(children) {
      return children;
    }
  }, {
    key: 'select',
    value: function select(value) {
      var children = this.toChildrenArray(this.props.children);
      for (var i = 0, len = children.length; i < len; i += 1) {
        if (this.getChildMember(children[i], 'value') === value) {
          this.selectByIndex(i);
          return;
        }
      }
      this.selectByIndex(0);
    }
  }, {
    key: 'selectByIndex',
    value: function selectByIndex(index) {
      if (index < 0 || index >= this.toChildrenArray(this.props.children).length || !this.itemHeight) {
        return;
      }
      this.scrollTo(index * this.itemHeight);
    }
  }, {
    key: 'doScrollingComplete',
    value: function doScrollingComplete(top) {
      var index = top / this.itemHeight;
      var floor = Math.floor(index);
      if (index - floor > 0.5) {
        index = floor + 1;
      } else {
        index = floor;
      }

      var children = this.toChildrenArray(this.props.children);

      index = Math.min(index, children.length - 1);
      var child = children[index];
      if (child) {
        this.fireValueChange(this.getChildMember(child, 'value'));
      } else if (console.warn) {
        console.warn('child not found', children, index);
      }
    }
  }, {
    key: 'render',
    value: function render() {
      var _pickerCls;

      var _props = this.props,
          children = _props.children,
          prefixCls = _props.prefixCls,
          className = _props.className,
          itemStyle = _props.itemStyle,
          indicatorStyle = _props.indicatorStyle;
      var selectedValue = this.state.selectedValue;

      var itemClassName = prefixCls + '-item';
      var selectedItemClassName = itemClassName + ' ' + prefixCls + '-item-selected';
      var items = children.map(function (item) {
        return _react2.default.createElement(
          'div',
          {
            style: itemStyle,
            className: selectedValue === item.value ? selectedItemClassName : itemClassName,
            key: item.value },
          item.label
        );
      });
      var pickerCls = (_pickerCls = {}, _defineProperty(_pickerCls, className, !!className), _defineProperty(_pickerCls, prefixCls, true), _pickerCls);
      return _react2.default.createElement(
        'div',
        {
          className: (0, _classnames2.default)(pickerCls) },
        _react2.default.createElement('div', { className: prefixCls + '-indicator', ref: 'indicator', style: indicatorStyle }),
        _react2.default.createElement(
          'div',
          { className: prefixCls + '-content', ref: 'content' },
          items
        )
      );
    }
  }]);

  return Picker;
}(_react.Component);

Picker.defaultProps = {
  prefixCls: 'ui-cascaderpicker',
  pure: true,
  onValueChange: function onValueChange() {}
};

exports.default = Picker;