[clarity/consistency] rename /explorev2/ -> /explore/ (#2802)

* rename /explorev2/ -> /explore/

* add redirect for existing explorev2 urls

* fix long line

* remove extra line

* fix missed ref in spec

superset/assets/javascripts/explore/components/Control.jsx

@@ -0,0 +1,110 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import ControlHeader from './ControlHeader';
+
+import CheckboxControl from './controls/CheckboxControl';
+import FilterControl from './controls/FilterControl';
+import HiddenControl from './controls/HiddenControl';
+import SelectControl from './controls/SelectControl';
+import TextAreaControl from './controls/TextAreaControl';
+import TextControl from './controls/TextControl';
+
+const controlMap = {
+  CheckboxControl,
+  FilterControl,
+  HiddenControl,
+  SelectControl,
+  TextAreaControl,
+  TextControl,
+};
+const controlTypes = Object.keys(controlMap);
+
+const propTypes = {
+  actions: PropTypes.object.isRequired,
+  name: PropTypes.string.isRequired,
+  type: PropTypes.oneOf(controlTypes).isRequired,
+  hidden: PropTypes.bool,
+  label: PropTypes.string.isRequired,
+  choices: PropTypes.arrayOf(PropTypes.array),
+  description: PropTypes.string,
+  places: PropTypes.number,
+  validators: PropTypes.array,
+  validationErrors: PropTypes.array,
+  renderTrigger: PropTypes.bool,
+  rightNode: PropTypes.node,
+  value: PropTypes.oneOfType([
+    PropTypes.string,
+    PropTypes.number,
+    PropTypes.bool,
+    PropTypes.array]),
+};
+
+const defaultProps = {
+  renderTrigger: false,
+  validators: [],
+  hidden: false,
+  validationErrors: [],
+};
+
+export default class Control extends React.PureComponent {
+  constructor(props) {
+    super(props);
+    this.validate = this.validate.bind(this);
+    this.onChange = this.onChange.bind(this);
+  }
+  componentDidMount() {
+    this.validateAndSetValue(this.props.value, []);
+  }
+  onChange(value, errors) {
+    this.validateAndSetValue(value, errors);
+  }
+  validateAndSetValue(value, errors) {
+    let validationErrors = this.props.validationErrors;
+    let currentErrors = this.validate(value);
+    if (errors && errors.length > 0) {
+      currentErrors = validationErrors.concat(errors);
+    }
+    if (validationErrors.length + currentErrors.length > 0) {
+      validationErrors = currentErrors;
+    }
+
+    if (value !== this.props.value || validationErrors !== this.props.validationErrors) {
+      this.props.actions.setControlValue(this.props.name, value, validationErrors);
+    }
+  }
+  validate(value) {
+    const validators = this.props.validators;
+    const validationErrors = [];
+    if (validators && validators.length > 0) {
+      validators.forEach((f) => {
+        const v = f(value);
+        if (v) {
+          validationErrors.push(v);
+        }
+      });
+    }
+    return validationErrors;
+  }
+  render() {
+    const ControlType = controlMap[this.props.type];
+    const divStyle = this.props.hidden ? { display: 'none' } : null;
+    return (
+      <div style={divStyle}>
+        <ControlHeader
+          label={this.props.label}
+          description={this.props.description}
+          renderTrigger={this.props.renderTrigger}
+          validationErrors={this.props.validationErrors}
+          rightNode={this.props.rightNode}
+        />
+        <ControlType
+          onChange={this.onChange}
+          {...this.props}
+        />
+      </div>
+    );
+  }
+}
+
+Control.propTypes = propTypes;
+Control.defaultProps = defaultProps;