React Native 实战封装组件

　　自用笔记：本文属于自用笔记，不做详解，仅供参考。在此记录自己已理解并开始遵循的前端代码规范。What How Why

JSX实战

Reactnative中没有DOM的概念，只有组件的概念，所以我们HTML标签、DOM操作是无效的。但是组件的生命周期、JSX语法、事件绑定、自定义属性等，ReactNative与React.js是一样的。

封装Box组件

'use strict';
import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  View
} from 'react-native';

class Box extends Component{
  render(){
    return (
        <View style={[BoxStyles.box,BoxStyles[this.props.width],BoxStyles[this.props.height]]}>
          <View  style={[BoxStyles.top,BoxStyles.height50,BoxStyles[this.props.classBg]]}><Text>top</Text></View>
          <View style={[BoxStyles[this.props.childName]]}>
            <View style={[BoxStyles.left,BoxStyles[this.props.classBg]]}><Text>left</Text></View>
            {this.props.children}
            <View style={[BoxStyles.right,BoxStyles[this.props.classBg]]}><Text>right</Text></View>
          </View>
          <View style={[BoxStyles.bottom,BoxStyles.height50,BoxStyles[this.props.classBg]]}><Text>bottom</Text></View>
          <View style={[BoxStyles.label]}><Text>{this.props.boxName}</Text></View>
        </View>
    )
  }
}

class MargginBox extends Component{
  render(){
    return (
        <View style={[BoxStyles.margginBox]}>
          <Box  childName="borderBox"  height="height400" width="width400" boxName="margin" classBg="bgred">{this.props.children}</Box>
        </View>
    )
  }
}

class BorderBox extends Component{
  render(){
    return (
        <Box childName="paddingBox"  height="height300" width="width300" boxName="border" classBg="bggreen" >{this.props.children}</Box>
    )
  }
}

class PaddingBox extends Component{
  render(){
    return (
        <Box childName="elementBox"  height="height200" width="width200" boxName="padding" classBg="bgyellow" >{this.props.children}</Box>
    )
  }
}

class ElementBox extends Component{
  render(){
    return (
        <View style={[BoxStyles.box,BoxStyles.height100]}>
          <View style={[BoxStyles.measureBox]}>
            <View style={[BoxStyles.right]}><Text>height</Text></View>
          </View>
          <View style={[BoxStyles.bottom,BoxStyles.height50]} ><Text>width</Text></View>
          <View style={[BoxStyles.label]}><Text>element</Text></View>
          <View style={[BoxStyles.widthdashed]}></View>
          <View style={[BoxStyles.heightdashed]}></View>
        </View>
    )
  }
}

class luumans extends Component {
  render(){
    return (
        <MargginBox>
          <BorderBox>
            <PaddingBox>
              <ElementBox>
              </ElementBox>
            </PaddingBox>
          </BorderBox>
        </MargginBox>
    )
  }
}

const BoxStyles = StyleSheet.create({
  height50:{
    height: 50,
  },
  height400:{
    height: 400,
  },
  height300:{
    height: 300,
  },
  height200:{
    height: 200,
  },
  height100:{
    height: 100,
  },
  width400:{
    width: 400,
  },
  width300:{
    width: 300,
  },
  width200:{
    width: 200,
  },
  width100:{
    width: 100,
  },
  bgred: {
    backgroundColor:'#6AC5AC',
  },
  bggreen: {
    backgroundColor: '#414142',
  },
  bgyellow: {
    backgroundColor: '#D64078',
  },
  box: {
    flexDirection: 'column',
    flex: 1,
    position: 'relative',
  },
  label: {
    top: 0,
    left: 0,
    paddingTop: 0,
    paddingRight: 3,
    paddingBottom: 3,
    paddingLeft: 0,
    position: 'absolute',
    backgroundColor: '#FDC72F',
  },
  top: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  bottom: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  right: {
    width: 50,
    justifyContent: 'space-around',
    alignItems: 'center',
  },
  left: {
    width: 50,
    justifyContent: 'space-around',
    alignItems: 'center',
  },
  heightdashed: {
    bottom: 0,
    top: 0,
    right: 20,
    borderLeftWidth: 1,
    position: 'absolute',
    borderLeftColor: '#FDC72F',
  },
  widthdashed: {
    bottom: 25,
    left: 0,
    right: 0,
    borderTopWidth: 1,
    position: 'absolute',
    borderTopColor: '#FDC72F',
  },
  yellow: {
    color: '#FDC72F',
    fontWeight:'900',
  },
  white: {
    color: 'white',
    fontWeight:'900',
  },
  margginBox:{
    position: 'absolute',
    top: 100,
    paddingLeft:7,
    paddingRight:7,
  },
  borderBox:{
    flex: 1,
    justifyContent: 'space-between',
    flexDirection: 'row',
  },
  paddingBox:{
    flex: 1,
    justifyContent: 'space-between',
    flexDirection: 'row',
  },
  elementBox:{
    flex: 1,
    justifyContent: 'space-between',
    flexDirection: 'row',
  },
  measureBox:{
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'flex-end',
    alignItems:'flex-end',
  },
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

AppRegistry.registerComponent('luumans', () => luumans);

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