react-native/Libraries/Components/Picker/Picker.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule Picker
* @flow
*/
'use strict';
var ColorPropType = require('ColorPropType');
var PickerIOS = require('PickerIOS');
var PickerAndroid = require('PickerAndroid');
var Platform = require('Platform');
var React = require('React');
var StyleSheet = require('StyleSheet');
var StyleSheetPropType = require('StyleSheetPropType');
var TextStylePropTypes = require('TextStylePropTypes');
var UnimplementedView = require('UnimplementedView');
var View = require('View');
var ViewStylePropTypes = require('ViewStylePropTypes');
var itemStylePropType = StyleSheetPropType(TextStylePropTypes);
var pickerStyleType = StyleSheetPropType({
...ViewStylePropTypes,
color: ColorPropType,
});
var MODE_DIALOG = 'dialog';
var MODE_DROPDOWN = 'dropdown';
/**
* Renders the native picker component on iOS and Android. Example:
*
* <Picker
* selectedValue={this.state.language}
* onValueChange={(lang) => this.setState({language: lang})}>
* <Picker.Item label="Java" value="java" />
* <Picker.Item label="JavaScript" value="js" />
* </Picker>
*/
var Picker = React.createClass({
statics: {
/**
* On Android, display the options in a dialog.
*/
MODE_DIALOG: MODE_DIALOG,
/**
* On Android, display the options in a dropdown (this is the default).
*/
MODE_DROPDOWN: MODE_DROPDOWN,
},
getDefaultProps: function() {
return {
mode: MODE_DIALOG,
};
},
propTypes: {
...View.propTypes,
style: pickerStyleType,
/**
* Value matching value of one of the items. Can be a string or an integer.
*/
selectedValue: React.PropTypes.any,
/**
* Callback for when an item is selected. This is called with the following parameters:
* - `itemValue`: the `value` prop of the item that was selected
* - `itemPosition`: the index of the selected item in this picker
*/
onValueChange: React.PropTypes.func,
/**
* If set to false, the picker will be disabled, i.e. the user will not be able to make a
* selection.
* @platform android
*/
enabled: React.PropTypes.bool,
/**
* On Android, specifies how to display the selection items when the user taps on the picker:
*
* - 'dialog': Show a modal dialog. This is the default.
* - 'dropdown': Shows a dropdown anchored to the picker view
*
* @platform android
*/
mode: React.PropTypes.oneOf(['dialog', 'dropdown']),
/**
* Style to apply to each of the item labels.
* @platform ios
*/
itemStyle: itemStylePropType,
/**
* Prompt string for this picker, used on Android in dialog mode as the title of the dialog.
* @platform android
*/
prompt: React.PropTypes.string,
/**
* Used to locate this view in end-to-end tests.
*/
testID: React.PropTypes.string,
},
render: function() {
if (Platform.OS === 'ios') {
return <PickerIOS {...this.props}>{this.props.children}</PickerIOS>;
} else if (Platform.OS === 'android') {
return <PickerAndroid {...this.props}>{this.props.children}</PickerAndroid>;
} else {
return <UnimplementedView />;
}
},
});
/**
* Individual selectable item in a Picker.
*/
Picker.Item = React.createClass({
propTypes: {
/**
* Text to display for this item.
*/
label: React.PropTypes.string.isRequired,
/**
* The value to be passed to picker's `onValueChange` callback when
* this item is selected. Can be a string or an integer.
*/
value: React.PropTypes.any,
/**
* Color of this item's text.
* @platform android
*/
color: ColorPropType,
/**
* Used to locate the item in end-to-end tests.
*/
testID: React.PropTypes.string,
},
render: function() {
// The items are not rendered directly
throw null;
},
});
module.exports = Picker;