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App.js
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App.js
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import React, {Component} from 'react';
import {StyleSheet, View, Text, Image, TouchableOpacity} from 'react-native';
class App extends Component {
constructor(props){
super(props);
this.state = {
numero: 0,
botao: 'VAI',
ultimo: null
};
//Variavel do timer do relogio.
this.timer = null;
this.vai= this.vai.bind(this);
this.limpar = this.limpar.bind(this);
}
vai (){
if(this.timer != null){
//Aqui vai parar o timer
clearInterval(this.timer);
this.timer = null;
this.setState({botao: 'VAI'})
}else{
//Comeca girar o timer
this.timer = setInterval(() => {
this.setState({numero: this.state.numero + 0.1})
}, 100 );
this.setState({botao:'PARAR'});
}
}
limpar(){
if(this.timer != null){
//Aqui vai parar o timer
clearInterval(this.timer);
this.timer = null;
}
this.setState({
ultimo: this.state.numero,
numero:0,
botao:'VAI'
})
}
render() {
return (
<View style={styles.container}>
<Image
source={require('./src/cronometro.png')}
style={styles.cronometro}
/>
<Text style={styles.timer}> {this.state.numero.toFixed(1)} </Text>
<View style={styles.btnArea}>
<TouchableOpacity style={styles.btn} onPress={this.vai}>
<Text style={styles.btnTexto}>{this.state.botao}</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.btn} onPress={this.limpar}>
<Text style={styles.btnTexto}>LIMPAR</Text>
</TouchableOpacity>
</View>
<View style={styles.areaUltima}>
<Text style={styles.textoCorrida}>
{this.state.ultimo > 0 ? 'Ultimo tempo: ' + this.state.ultimo.toFixed(2) : ''}
</Text>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
backgroundColor: '#00aeef'
},
timer:{
marginTop: -160,
color: '#FFF',
fontSize: 65,
fontWeight:'bold'
},
btnArea:{
flexDirection:'row',
marginTop: 70,
height: 40
},
btn:{
flex: 1,
justifyContent: 'center',
alignItems:'center',
backgroundColor: '#FFF',
height:40,
margin: 40,
borderRadius:9
},
btnTexto:{
fontSize:20,
fontWeight: 'bold',
color:'#00aeef',
},
areaUltima:{
marginTop: 40,
},
textoCorrida:{
fontSize:25,
fontStyle:'italic',
color:'#FFF'
}
});
export default App;