150 lines
4.1 KiB
JavaScript
150 lines
4.1 KiB
JavaScript
/**
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* The examples provided by Facebook are for non-commercial testing and
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* evaluation purposes only.
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*
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* Facebook reserves all rights not expressly granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
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* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* @flow
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*/
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'use strict';
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var React = require('react-native');
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var {
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Image,
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LayoutAnimation,
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StyleSheet,
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Text,
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View,
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} = React;
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type LayoutEvent = {
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nativeEvent: {
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layout: {
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x: number;
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y: number;
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width: number;
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height: number;
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};
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};
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};
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var LayoutEventExample = React.createClass({
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getInitialState: function() {
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return {
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viewStyle: {
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margin: 20,
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},
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};
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},
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animateViewLayout: function() {
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LayoutAnimation.configureNext(
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LayoutAnimation.Presets.spring,
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() => {
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console.log('layout animation done.');
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this.addWrapText();
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}
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);
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this.setState({
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viewStyle: {
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margin: this.state.viewStyle.margin > 20 ? 20 : 60,
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}
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});
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},
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addWrapText: function() {
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this.setState(
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{extraText: ' And a bunch more text to wrap around a few lines.'},
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this.changeContainer
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);
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},
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changeContainer: function() {
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this.setState({containerStyle: {width: 280}});
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},
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onViewLayout: function(e: LayoutEvent) {
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console.log('received view layout event\n', e.nativeEvent);
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this.setState({viewLayout: e.nativeEvent.layout});
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},
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onTextLayout: function(e: LayoutEvent) {
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console.log('received text layout event\n', e.nativeEvent);
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this.setState({textLayout: e.nativeEvent.layout});
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},
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onImageLayout: function(e: LayoutEvent) {
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console.log('received image layout event\n', e.nativeEvent);
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this.setState({imageLayout: e.nativeEvent.layout});
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},
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render: function() {
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var viewStyle = [styles.view, this.state.viewStyle];
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var textLayout = this.state.textLayout || {width: '?', height: '?'};
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var imageLayout = this.state.imageLayout || {x: '?', y: '?'};
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return (
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<View style={this.state.containerStyle}>
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<Text>
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onLayout events are called on mount and whenever layout is updated,
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including after layout animations complete.{' '}
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<Text style={styles.pressText} onPress={this.animateViewLayout}>
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Press here to change layout.
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</Text>
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</Text>
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<View ref="view" onLayout={this.onViewLayout} style={viewStyle}>
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<Image
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ref="img"
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onLayout={this.onImageLayout}
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style={styles.image}
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source={{uri: 'https://fbcdn-dragon-a.akamaihd.net/hphotos-ak-prn1/t39.1997/p128x128/851561_767334496626293_1958532586_n.png'}}
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/>
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<Text>
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ViewLayout: {JSON.stringify(this.state.viewLayout, null, ' ') + '\n\n'}
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</Text>
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<Text ref="txt" onLayout={this.onTextLayout} style={styles.text}>
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A simple piece of text.{this.state.extraText}
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</Text>
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<Text>
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{'\n'}
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Text w/h: {textLayout.width}/{textLayout.height + '\n'}
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Image x/y: {imageLayout.x}/{imageLayout.y}
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</Text>
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</View>
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</View>
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);
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}
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});
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var styles = StyleSheet.create({
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view: {
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padding: 12,
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borderColor: 'black',
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borderWidth: 0.5,
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backgroundColor: 'transparent',
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},
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text: {
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alignSelf: 'flex-start',
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borderColor: 'rgba(0, 0, 255, 0.2)',
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borderWidth: 0.5,
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},
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image: {
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width: 50,
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height: 50,
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marginBottom: 10,
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alignSelf: 'center',
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},
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pressText: {
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fontWeight: 'bold',
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},
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});
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exports.title = 'onLayout';
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exports.description = 'Layout events can be used to measure view size and position.';
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exports.examples = [
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{
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title: 'onLayout',
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render: function(): ReactElement {
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return <LayoutEventExample />;
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},
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}];
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