474 строки
13 KiB
JavaScript
474 строки
13 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict-local
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*/
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'use strict';
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/* eslint-disable react-native/no-inline-styles */
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const React = require('react');
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const {
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StyleSheet,
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Text,
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TouchableWithoutFeedback,
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View,
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} = require('react-native');
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exports.title = '<View>';
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exports.description =
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'Basic building block of all UI, examples that ' +
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'demonstrate some of the many styles available.';
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exports.displayName = 'ViewExample';
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exports.examples = [
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{
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title: 'Background Color',
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render() {
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return (
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<View style={{backgroundColor: '#527FE4', padding: 5}}>
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<Text style={{fontSize: 11}}>Blue background</Text>
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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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title: 'Border',
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render() {
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return (
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<View style={{borderColor: '#527FE4', borderWidth: 5, padding: 10}}>
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<Text style={{fontSize: 11}}>5px blue border</Text>
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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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title: 'Padding/Margin',
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render() {
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const styles = StyleSheet.create({
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box: {
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backgroundColor: '#527FE4',
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borderColor: '#000033',
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borderWidth: 1,
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},
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});
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return (
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<View style={{borderColor: '#bb0000', borderWidth: 0.5}}>
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<View style={[styles.box, {padding: 5}]}>
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<Text style={{fontSize: 11}}>5px padding</Text>
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</View>
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<View style={[styles.box, {margin: 5}]}>
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<Text style={{fontSize: 11}}>5px margin</Text>
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</View>
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<View
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style={[
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styles.box,
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{margin: 5, padding: 5, alignSelf: 'flex-start'},
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]}>
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<Text style={{fontSize: 11}}>5px margin and padding,</Text>
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<Text style={{fontSize: 11}}>widthAutonomous=true</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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{
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title: 'Border Radius',
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render() {
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return (
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<View style={{borderWidth: 0.5, borderRadius: 5, padding: 5}}>
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<Text style={{fontSize: 11}}>
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Too much use of `borderRadius` (especially large radii) on anything
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which is scrolling may result in dropped frames. Use sparingly.
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</Text>
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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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title: 'Border Style',
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render() {
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type Props = $ReadOnly<{||}>;
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type State = {|
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showBorder: boolean,
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|};
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class ViewBorderStyleExample extends React.Component<Props, State> {
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state = {
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showBorder: true,
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};
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render() {
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return (
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<TouchableWithoutFeedback onPress={this._handlePress}>
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<View>
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<View
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style={[
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{
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borderWidth: 1,
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padding: 5,
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},
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this.state.showBorder
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? {
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borderStyle: 'dashed',
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}
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: null,
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]}>
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<Text style={{fontSize: 11}}>Dashed border style</Text>
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</View>
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<View
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style={[
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{
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marginTop: 5,
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borderWidth: 1,
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borderRadius: 5,
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padding: 5,
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},
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this.state.showBorder
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? {
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borderStyle: 'dotted',
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}
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: null,
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]}>
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<Text style={{fontSize: 11}}>Dotted border style</Text>
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</View>
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</View>
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</TouchableWithoutFeedback>
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);
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}
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_handlePress = () => {
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this.setState({showBorder: !this.state.showBorder});
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};
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}
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return <ViewBorderStyleExample />;
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},
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},
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{
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title: 'Circle with Border Radius',
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render() {
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return (
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<View
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style={{borderRadius: 10, borderWidth: 1, width: 20, height: 20}}
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/>
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);
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},
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},
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{
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title: 'Overflow',
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render() {
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const styles = StyleSheet.create({
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container: {
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borderWidth: StyleSheet.hairlineWidth,
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height: 12,
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marginBottom: 8,
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marginEnd: 16,
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width: 95,
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},
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content: {
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height: 20,
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width: 200,
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},
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});
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// NOTE: The <View> that sets `overflow` should only have other layout
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// styles so that we can accurately test view flattening optimizations.
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return (
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<View style={{flexDirection: 'row'}}>
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<View style={styles.container}>
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<View style={[StyleSheet.absoluteFill]}>
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<Text style={styles.content}>undefined</Text>
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</View>
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</View>
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<View style={styles.container}>
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<View style={[StyleSheet.absoluteFill, {overflow: 'hidden'}]}>
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<Text style={styles.content}>hidden</Text>
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</View>
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</View>
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<View style={styles.container}>
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<View style={[StyleSheet.absoluteFill, {overflow: 'visible'}]}>
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<Text style={styles.content}>visible</Text>
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</View>
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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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{
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title: 'Opacity',
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render() {
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return (
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<View>
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<View style={{opacity: 0}}>
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<Text>Opacity 0</Text>
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</View>
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<View style={{opacity: 0.1}}>
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<Text>Opacity 0.1</Text>
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</View>
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<View style={{opacity: 0.3}}>
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<Text>Opacity 0.3</Text>
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</View>
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<View style={{opacity: 0.5}}>
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<Text>Opacity 0.5</Text>
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</View>
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<View style={{opacity: 0.7}}>
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<Text>Opacity 0.7</Text>
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</View>
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<View style={{opacity: 0.9}}>
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<Text>Opacity 0.9</Text>
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</View>
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<View style={{opacity: 1}}>
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<Text>Opacity 1</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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{
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title: 'Offscreen Alpha Compositing',
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render() {
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type Props = $ReadOnly<{||}>;
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type State = {|
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active: boolean,
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|};
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const styles = StyleSheet.create({
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alphaCompositing: {
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justifyContent: 'space-around',
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width: 100,
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height: 50,
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borderRadius: 100,
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},
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});
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class OffscreenAlphaCompositing extends React.Component<Props, State> {
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state = {
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active: false,
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};
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render() {
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return (
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<TouchableWithoutFeedback onPress={this._handlePress}>
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<View>
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<Text style={{paddingBottom: 10}}>Blobs</Text>
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<View
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style={{opacity: 1.0, paddingBottom: 30}}
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needsOffscreenAlphaCompositing={this.state.active}>
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<View
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style={[
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styles.alphaCompositing,
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{marginTop: 0, marginLeft: 0, backgroundColor: '#FF6F59'},
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]}
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/>
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<View
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style={[
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styles.alphaCompositing,
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{
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marginTop: -50,
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marginLeft: 50,
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backgroundColor: '#F7CB15',
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},
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]}
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/>
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</View>
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<Text style={{paddingBottom: 10}}>
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Same blobs, but their shared container have 0.5 opacity
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</Text>
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<Text style={{paddingBottom: 10}}>
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Tap to {this.state.active ? 'activate' : 'deactivate'}{' '}
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needsOffscreenAlphaCompositing
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</Text>
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<View
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style={{opacity: 0.8}}
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needsOffscreenAlphaCompositing={this.state.active}>
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<View
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style={[
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styles.alphaCompositing,
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{marginTop: 0, marginLeft: 0, backgroundColor: '#FF6F59'},
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]}
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/>
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<View
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style={[
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styles.alphaCompositing,
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{
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marginTop: -50,
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marginLeft: 50,
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backgroundColor: '#F7CB15',
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},
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]}
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/>
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</View>
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</View>
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</TouchableWithoutFeedback>
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);
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}
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_handlePress = () => {
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this.setState({active: !this.state.active});
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};
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}
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return <OffscreenAlphaCompositing />;
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},
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},
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{
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title: 'ZIndex',
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render() {
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type Props = $ReadOnly<{||}>;
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type State = {|
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flipped: boolean,
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|};
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const styles = StyleSheet.create({
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zIndex: {
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justifyContent: 'space-around',
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width: 100,
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height: 50,
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marginTop: -10,
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},
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});
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class ZIndexExample extends React.Component<Props, State> {
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state = {
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flipped: false,
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};
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render() {
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const indices = this.state.flipped ? [-1, 0, 1, 2] : [2, 1, 0, -1];
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return (
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<TouchableWithoutFeedback onPress={this._handlePress}>
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<View>
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<Text style={{paddingBottom: 10}}>
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Tap to flip sorting order
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</Text>
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<View
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style={[
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styles.zIndex,
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{
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marginTop: 0,
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backgroundColor: '#E57373',
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zIndex: indices[0],
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},
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]}>
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<Text>ZIndex {indices[0]}</Text>
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</View>
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<View
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style={[
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styles.zIndex,
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{
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marginLeft: 50,
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backgroundColor: '#FFF176',
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zIndex: indices[1],
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},
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]}>
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<Text>ZIndex {indices[1]}</Text>
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</View>
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<View
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style={[
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styles.zIndex,
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{
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marginLeft: 100,
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backgroundColor: '#81C784',
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zIndex: indices[2],
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},
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]}>
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<Text>ZIndex {indices[2]}</Text>
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</View>
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<View
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style={[
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styles.zIndex,
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{
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marginLeft: 150,
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backgroundColor: '#64B5F6',
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zIndex: indices[3],
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},
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]}>
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<Text>ZIndex {indices[3]}</Text>
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</View>
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</View>
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</TouchableWithoutFeedback>
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);
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}
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_handlePress = () => {
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this.setState({flipped: !this.state.flipped});
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};
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}
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return <ZIndexExample />;
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},
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},
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{
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title: 'BackfaceVisibility',
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render: function() {
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return (
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<>
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<Text style={{paddingBottom: 10}}>
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View #1, front is visible, back is hidden.
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</Text>
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<View style={{justifyContent: 'center', alignItems: 'center'}}>
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<View
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style={{
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height: 200,
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width: 200,
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justifyContent: 'center',
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alignItems: 'center',
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backgroundColor: 'blue',
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backfaceVisibility: 'hidden',
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}}>
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<Text>Front</Text>
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</View>
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<View
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style={{
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height: 200,
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width: 200,
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justifyContent: 'center',
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alignItems: 'center',
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backgroundColor: 'red',
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backfaceVisibility: 'hidden',
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transform: [{rotateY: '180deg'}],
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position: 'absolute',
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top: 0,
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}}>
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<Text>Back (You should not see this)</Text>
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</View>
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</View>
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<Text style={{paddingVertical: 10}}>
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View #2, front is hidden, back is visible.
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</Text>
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<View style={{justifyContent: 'center', alignItems: 'center'}}>
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<View
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style={{
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height: 200,
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width: 200,
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justifyContent: 'center',
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alignItems: 'center',
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backgroundColor: 'blue',
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backfaceVisibility: 'hidden',
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}}>
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<Text>Front (You should not see this)</Text>
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</View>
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<View
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style={{
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height: 200,
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width: 200,
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justifyContent: 'center',
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alignItems: 'center',
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backgroundColor: 'red',
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backfaceVisibility: 'hidden',
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position: 'absolute',
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top: 0,
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}}>
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<Text>Back</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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},
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];
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