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Slider.js
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Slider.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 Slider
* @flow
*/
'use strict';
var Image = require('Image');
var ColorPropType = require('ColorPropType');
var NativeMethodsMixin = require('NativeMethodsMixin');
var ReactNativeViewAttributes = require('ReactNativeViewAttributes');
var Platform = require('Platform');
var React = require('React');
var StyleSheet = require('StyleSheet');
var View = require('View');
var requireNativeComponent = require('requireNativeComponent');
var PropTypes = React.PropTypes;
type Event = Object;
/**
* A component used to select a single value from a range of values.
*/
var Slider = React.createClass({
mixins: [NativeMethodsMixin],
propTypes: {
...View.propTypes,
/**
* Used to style and layout the `Slider`. See `StyleSheet.js` and
* `ViewStylePropTypes.js` for more info.
*/
style: View.propTypes.style,
/**
* Initial value of the slider. The value should be between minimumValue
* and maximumValue, which default to 0 and 1 respectively.
* Default value is 0.
*
* *This is not a controlled component*, you don't need to update the
* value during dragging.
*/
value: PropTypes.number,
/**
* Step value of the slider. The value should be
* between 0 and (maximumValue - minimumValue).
* Default value is 0.
*/
step: PropTypes.number,
/**
* Initial minimum value of the slider. Default value is 0.
*/
minimumValue: PropTypes.number,
/**
* Initial maximum value of the slider. Default value is 1.
*/
maximumValue: PropTypes.number,
/**
* The color used for the track to the left of the button.
* Overrides the default blue gradient image on iOS.
*/
minimumTrackTintColor: ColorPropType,
/**
* The color used for the track to the right of the button.
* Overrides the default blue gradient image on iOS.
*/
maximumTrackTintColor: ColorPropType,
/**
* If true the user won't be able to move the slider.
* Default value is false.
*/
disabled: PropTypes.bool,
/**
* Assigns a single image for the track. Only static images are supported.
* The center pixel of the image will be stretched to fill the track.
* @platform ios
*/
trackImage: Image.propTypes.source,
/**
* Assigns a minimum track image. Only static images are supported. The
* rightmost pixel of the image will be stretched to fill the track.
* @platform ios
*/
minimumTrackImage: Image.propTypes.source,
/**
* Assigns a maximum track image. Only static images are supported. The
* leftmost pixel of the image will be stretched to fill the track.
* @platform ios
*/
maximumTrackImage: Image.propTypes.source,
/**
* Sets an image for the thumb. Only static images are supported.
* @platform ios
*/
thumbImage: Image.propTypes.source,
/**
* Color of the foreground switch grip.
* @platform android
*/
thumbTintColor: ColorPropType,
/**
* Callback continuously called while the user is dragging the slider.
*/
onValueChange: PropTypes.func,
/**
* Callback called when the user finishes changing the value (e.g. when
* the slider is released).
*/
onSlidingComplete: PropTypes.func,
/**
* Used to locate this view in UI automation tests.
*/
testID: PropTypes.string,
},
getDefaultProps: function() : any {
return {
disabled: false,
value: 0,
minimumValue: 0,
maximumValue: 1,
step: 0
};
},
viewConfig: {
uiViewClassName: 'RCTSlider',
validAttributes: {
...ReactNativeViewAttributes.RCTView,
value: true
}
},
render: function() {
const {style, onValueChange, onSlidingComplete, ...props} = this.props;
props.style = [styles.slider, style];
props.onValueChange = onValueChange && ((event: Event) => {
let userEvent = true;
if (Platform.OS === 'android') {
// On Android there's a special flag telling us the user is
// dragging the slider.
userEvent = event.nativeEvent.fromUser;
}
onValueChange && userEvent && onValueChange(event.nativeEvent.value);
});
props.onChange = props.onValueChange;
props.onSlidingComplete = onSlidingComplete && ((event: Event) => {
onSlidingComplete && onSlidingComplete(event.nativeEvent.value);
});
return <RCTSlider
{...props}
enabled={!this.props.disabled}
onStartShouldSetResponder={() => true}
onResponderTerminationRequest={() => false}
/>;
}
});
let styles;
if (Platform.OS === 'ios') {
styles = StyleSheet.create({
slider: {
height: 40,
},
});
} else {
styles = StyleSheet.create({
slider: {},
});
}
let options = {};
if (Platform.OS === 'android') {
options = {
nativeOnly: {
enabled: true,
}
};
}
const RCTSlider = requireNativeComponent('RCTSlider', Slider, options);
module.exports = Slider;