281 lines
7.5 KiB
JavaScript
281 lines
7.5 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule Slider
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* @flow
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*/
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'use strict';
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var Image = require('Image');
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var ColorPropType = require('ColorPropType');
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var NativeMethodsMixin = require('NativeMethodsMixin');
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var ReactNativeViewAttributes = require('ReactNativeViewAttributes');
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var Platform = require('Platform');
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var React = require('React');
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var PropTypes = require('prop-types');
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var StyleSheet = require('StyleSheet');
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var ViewPropTypes = require('ViewPropTypes');
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var createReactClass = require('create-react-class');
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var requireNativeComponent = require('requireNativeComponent');
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type Event = Object;
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/**
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* A component used to select a single value from a range of values.
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*
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* ### Usage
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*
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* The example below shows how to use `Slider` to change
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* a value used by `Text`. The value is stored using
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* the state of the root component (`App`). The same component
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* subscribes to the `onValueChange` of `Slider` and changes
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* the value using `setState`.
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*
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*```
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* import React from 'react';
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* import { StyleSheet, Text, View, Slider } from 'react-native';
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*
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* export default class App extends React.Component {
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* constructor(props) {
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* super(props);
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* this.state = {
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* value: 50
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* }
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* }
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*
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* change(value) {
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* this.setState(() => {
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* return {
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* value: parseFloat(value)
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* };
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* });
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* }
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*
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* render() {
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* const {value} = this.state;
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* return (
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* <View style={styles.container}>
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* <Text style={styles.text}>{String(value)}</Text>
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* <Slider
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* step={1}
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* maximumValue={100}
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* onValueChange={this.change.bind(this)}
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* value={value} />
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* </View>
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* );
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* }
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* }
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*
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* const styles = StyleSheet.create({
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* container: {
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* flex: 1,
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* flexDirection: 'column',
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* justifyContent: 'center'
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* },
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* text: {
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* fontSize: 50,
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* textAlign: 'center'
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* }
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* });
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*```
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*
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*/
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var Slider = createReactClass({
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displayName: 'Slider',
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mixins: [NativeMethodsMixin],
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propTypes: {
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...ViewPropTypes,
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/**
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* Used to style and layout the `Slider`. See `StyleSheet.js` and
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* `ViewStylePropTypes.js` for more info.
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*/
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style: ViewPropTypes.style,
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/**
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* Initial value of the slider. The value should be between minimumValue
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* and maximumValue, which default to 0 and 1 respectively.
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* Default value is 0.
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*
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* *This is not a controlled component*, you don't need to update the
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* value during dragging.
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*/
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value: PropTypes.number,
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/**
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* Step value of the slider. The value should be
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* between 0 and (maximumValue - minimumValue).
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* Default value is 0.
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*/
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step: PropTypes.number,
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/**
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* Initial minimum value of the slider. Default value is 0.
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*/
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minimumValue: PropTypes.number,
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/**
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* Initial maximum value of the slider. Default value is 1.
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*/
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maximumValue: PropTypes.number,
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/**
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* The color used for the track to the left of the button.
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* Overrides the default blue gradient image on iOS.
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*/
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minimumTrackTintColor: ColorPropType,
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/**
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* The color used for the track to the right of the button.
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* Overrides the default blue gradient image on iOS.
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*/
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maximumTrackTintColor: ColorPropType,
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/**
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* If true the user won't be able to move the slider.
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* Default value is false.
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*/
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disabled: PropTypes.bool,
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/**
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* Assigns a single image for the track. Only static images are supported.
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* The center pixel of the image will be stretched to fill the track.
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* @platform ios
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*/
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trackImage: Image.propTypes.source,
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/**
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* Assigns a minimum track image. Only static images are supported. The
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* rightmost pixel of the image will be stretched to fill the track.
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* @platform ios
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*/
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minimumTrackImage: Image.propTypes.source,
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/**
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* Assigns a maximum track image. Only static images are supported. The
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* leftmost pixel of the image will be stretched to fill the track.
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* @platform ios
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*/
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maximumTrackImage: Image.propTypes.source,
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/**
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* Sets an image for the thumb. Only static images are supported.
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* @platform ios
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*/
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thumbImage: Image.propTypes.source,
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/**
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* Color of the foreground switch grip.
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* @platform android
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*/
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thumbTintColor: ColorPropType,
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/**
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* Callback continuously called while the user is dragging the slider.
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*/
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onValueChange: PropTypes.func,
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/**
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* Callback that is called when the user releases the slider,
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* regardless if the value has changed. The current value is passed
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* as an argument to the callback handler.
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*/
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onSlidingComplete: PropTypes.func,
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/**
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* Used to locate this view in UI automation tests.
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*/
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testID: PropTypes.string,
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},
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getDefaultProps: function() : any {
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return {
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disabled: false,
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value: 0,
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minimumValue: 0,
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maximumValue: 1,
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step: 0
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};
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},
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viewConfig: {
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uiViewClassName: 'RCTSlider',
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validAttributes: {
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...ReactNativeViewAttributes.RCTView,
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value: true
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}
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},
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render: function() {
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const {style, onValueChange, onSlidingComplete, ...props} = this.props;
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/* $FlowFixMe(>=0.54.0 site=react_native_fb,react_native_oss) This comment
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* suppresses an error found when Flow v0.54 was deployed. To see the error
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* delete this comment and run Flow. */
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props.style = [styles.slider, style];
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/* $FlowFixMe(>=0.54.0 site=react_native_fb,react_native_oss) This comment
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* suppresses an error found when Flow v0.54 was deployed. To see the error
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* delete this comment and run Flow. */
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props.onValueChange = onValueChange && ((event: Event) => {
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let userEvent = true;
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if (Platform.OS === 'android') {
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// On Android there's a special flag telling us the user is
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// dragging the slider.
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userEvent = event.nativeEvent.fromUser;
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}
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onValueChange && userEvent && onValueChange(event.nativeEvent.value);
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});
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/* $FlowFixMe(>=0.54.0 site=react_native_fb,react_native_oss) This comment
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* suppresses an error found when Flow v0.54 was deployed. To see the error
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* delete this comment and run Flow. */
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props.onChange = props.onValueChange;
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/* $FlowFixMe(>=0.54.0 site=react_native_fb,react_native_oss) This comment
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* suppresses an error found when Flow v0.54 was deployed. To see the error
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* delete this comment and run Flow. */
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props.onSlidingComplete = onSlidingComplete && ((event: Event) => {
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onSlidingComplete && onSlidingComplete(event.nativeEvent.value);
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});
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return <RCTSlider
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{...props}
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enabled={!this.props.disabled}
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onStartShouldSetResponder={() => true}
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onResponderTerminationRequest={() => false}
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/>;
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}
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});
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let styles;
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if (Platform.OS === 'ios') {
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styles = StyleSheet.create({
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slider: {
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height: 40,
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},
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});
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} else {
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styles = StyleSheet.create({
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slider: {},
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});
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}
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let options = {};
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if (Platform.OS === 'android') {
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options = {
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nativeOnly: {
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enabled: true,
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}
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};
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}
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const RCTSlider = requireNativeComponent('RCTSlider', Slider, options);
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module.exports = Slider;
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