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App.js
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App.js
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import React, { Component } from "react";
import {
StyleSheet,
Text,
View,
TextInput,
TouchableOpacity
} from "react-native";
export default class App extends Component {
constructor(props) {
super(props);
this.state = {
lenght: 0,
width: 0,
area: 0
};
}
onUpadateLength = length => {
this.setState({ length });
};
onUpdateWidth = width => {
this.setState({ width });
};
onUpdateArea = () => {
const { length, width } = this.state;
const area = length * width;
this.setState({ area });
};
render() {
const { area } = this.state;
return (
<View style={styles.container}>
<Text testID={"rectangleLengthText"} style={styles.label}>
Length :
</Text>
<TextInput
style={styles.label}
testID={"rectangleLengthInput"}
onChangeText={this.onUpadateLength}
placeholder="Enter a Number"
placeholderTextColor="#808080"
returnKeyType="done"
/>
<Text testID={"rectangleWidthText"} style={styles.label}>
Width :
</Text>
<TextInput
testID={"rectangleWidthInput"}
onChangeText={this.onUpdateWidth}
style={styles.label}
placeholder="Enter a Number"
placeholderTextColor="#808080"
returnKeyType="done"
/>
<TouchableOpacity
testID={"rectangleAreaButton"}
style={styles.button}
onPress={this.onUpdateArea}
>
<Text style={styles.textButton}>Calculate</Text>
</TouchableOpacity>
{area ? (
<Text testID={"rectangleAreaResult"} style={styles.output}>
{area}{" "}
</Text>
) : null}
</View>
);
}
}
const styles = StyleSheet.create({
container: {
padding: 20,
marginHorizontal: 15,
marginTop: 100
},
button: {
backgroundColor: "#414f6f",
borderRadius: 10,
marginTop: 20,
padding: 15
},
textButton: {
fontSize: 20,
alignSelf: "center",
color: "#ffffff"
},
label: {
height: 40,
backgroundColor: "rgba(225,225,225,0.2)",
marginBottom: 10,
padding: 10
},
output: {
padding: 15,
color: "#000000",
backgroundColor: "#ADD8E6",
borderRadius: 10,
marginTop: 20,
textAlign: "center"
}
});