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vedder-picker.ios.js
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vedder-picker.ios.js
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/**
* Copyright (c) 2015-present Dave Vedder
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree.
*
* @providesModule VPickerIOS
*
* This is a controlled component version of VDRPickerIOS
*
* WARNING: this is a proof of concept. Don't use it for reals yet. Also,
* if your container has `flex` set on it, the picker moves around oddly.
* I'm not sure if that's something I broke, or it happens in the default one
* as well. In addition, if you set a `width` on your picker, it seems to not
* behave properly. Set a background color on it when you set the width and
* you will see what I mean.
*
*/
'use strict';
var NativeMethodsMixin = require('NativeMethodsMixin');
var React = require('React');
var ReactChildren = require('ReactChildren');
var ReactIOSViewAttributes = require('ReactIOSViewAttributes');
var VDRPickerIOSConsts = require('NativeModules').UIManager.VDRPicker.Constants;
var StyleSheet = require('StyleSheet');
var View = require('View');
var createReactIOSNativeComponentClass =
require('createReactIOSNativeComponentClass');
var merge = require('merge');
var PICKER = 'picker';
var VPickerIOS = React.createClass({
propTypes: {
onChange: React.PropTypes.func, // event handler
controlled: React.PropTypes.bool, // if React can override native picker selections after a change.
},
mixins: [NativeMethodsMixin],
// converts child PickerComponent and their Item children into state
// that can be sent to VDRPicker native class.
_stateFromProps: function (props) {
var componentData = [];
var selectedIndexes = [];
ReactChildren.forEach(props.children, function (child, index) {
var items = []
var selectedIndex = 0; // sane default
var checkVal = child.props.selectedValue;
React.Children.forEach(child.props.children, function (child, idx) {
if (checkVal === child.props.value) {
selectedIndex = idx;
}
items.push({label: child.props.label, value: child.props.value});
});
componentData.push(items);
selectedIndexes.push(selectedIndex);
});
return { componentData, selectedIndexes };
},
getInitialState: function() {
return this._stateFromProps(this.props);
},
componentWillReceiveProps: function(nextProps) {
this.setState(this._stateFromProps(nextProps));
},
_onChange: function (event) {
var nativeEvent = event.nativeEvent;
// call any change handlers on the component itself
if (this.props.onChange) {
this.props.onChange(nativeEvent);
}
if (this.props.valueChange) {
this.props.valueChange(nativeEvent);
}
// call any change handlers on the child component picker that changed
// if it has one. Doing it this way rather than storing references
// to child nodes and their onChage props in _stateFromProps because
// React docs imply that may not be a good idea.
ReactChildren.forEach(this.props.children, function (child, idx) {
if (idx === nativeEvent.component && child.props.onChange) {
child.props.onChange(nativeEvent);
}
});
var nativeProps = {
componentData: this.state.componentData,
};
// if we are a controlled instance, we tell the native component what
// it's value should be after any change.
if (this.props.controlled) {
nativeProps.selectedIndexes = this.state.selectedIndexes;
}
this.refs[PICKER].setNativeProps(nativeProps);
},
render: function() {
return (
<View style={this.props.style}>
<VDRPickerIOS
ref={PICKER}
style={styles.rkPickerIOS}
selectedIndexes={this.state.selectedIndexes}
componentData={this.state.componentData}
onChange={this._onChange}
/>
</View>
);
},
});
// represents a "section" of a picker.
VPickerIOS.PickerComponent = React.createClass({
propTypes: {
items: React.PropTypes.array,
selectedIndex: React.PropTypes.number,
onChange: React.PropTypes.func,
},
render: function () {
return null;
},
});
// represents an item in a picker section
// the `value` is used for setting / getting selection
VPickerIOS.Item = React.createClass({
propTypes: {
value: React.PropTypes.any.isRequired, // string or integer basically
label: React.PropTypes.string.isRequired, // for display
},
render: function() {
// These items don't get rendered directly.
return null;
},
});
var styles = StyleSheet.create({
rkPickerIOS: {
height: VDRPickerIOSConsts.ComponentHeight,
},
});
var exposedPickerAttributes = merge(ReactIOSViewAttributes.UIView, {
componentData: true,
selectedIndexes: true,
});
var VDRPickerIOS = createReactIOSNativeComponentClass({
validAttributes: exposedPickerAttributes,
uiViewClassName: 'VDRPicker',
});
module.exports = VPickerIOS;