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App.js
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App.js
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/**
* Sample React Native App
* https://github.com/facebook/react-native
*
* @format
* @flow strict-local
*/
import React, { Component } from 'react';
import {
StyleSheet,
ScrollView,
View,
Text,
TouchableOpacity,
TextInput,
FlatList,
Dimensions,
Keyboard,
} from 'react-native';
const { height, width } = Dimensions.get('window')
class App extends Component {
constructor(props) {
super(props)
this.state = {
row: '',
column: '',
data: []
}
}
spiral = (NumCol, NumRow) => {
const arr = [];
// these for loop for number of row
for (let i = 0; i < NumRow; i++) {
arr.push([]);
}
let count = 1, endColumn = NumCol - 1, colIndex = 0, rowend = NumRow - 1, rowbegin = 0
while (colIndex <= endColumn && rowbegin <= rowend) {
// for top of the row in array
for (let i = colIndex; i <= endColumn; i++) {
arr[rowbegin][i] = count;
count++;
}
rowbegin++;
// for right of the column in array
for (let i = rowbegin; i <= rowend; i++) {
arr[i][endColumn] = count;
count++;
}
endColumn--;
// for bottom of the row in array
for (let i = endColumn; i >= colIndex; i--) {
arr[rowend][i] = count;
count++;
}
rowend--;
// in array top started row
for (let i = rowend; i >= rowbegin; i--) {
arr[i][colIndex] = count;
count++;
}
colIndex++;
}
this.setState({ data: arr })
}
getArrayData = () => {
if (this.state.row.length == 0) {
alert("Please Enter Row")
}
else if (this.state.column.length == 0) {
alert("Please Enter Column")
} else {
Keyboard.dismiss()
this.spiral(parseInt(this.state.column), parseInt(this.state.row))
}
}
renderInputs = () => {
return (
<View style={styles.inputStyle}>
<Text style={styles.cross}>Matrix : </Text>
<View style={styles.inputStyle}>
<TextInput
keyboardType={'decimal-pad'}
value={this.state.row}
style={styles.inputText}
placeholder={'Row'}
onChangeText={(text) => {
this.setState({ row: text })
}}
/>
<Text style={styles.cross}>X</Text>
<TextInput
keyboardType={'decimal-pad'}
value={this.state.column}
style={styles.inputText}
placeholder={'column'}
onChangeText={(text) => {
this.setState({ column: text })
}}
/>
</View>
</View>
)
}
renderButton = () => {
return (
<TouchableOpacity
onPress={() => {
this.getArrayData()
}}
style={styles.btn}>
<Text style={styles.display}>Display</Text>
</TouchableOpacity>
)
}
renderItem = ({ item, index }) => {
let rowNum = this.state.row.length == 0 ? 1 : parseInt(this.state.row),
colNum = this.state.column.length == 0 ? 1 : parseInt(this.state.column)
console.log(colNum, rowNum);
return (
<ScrollView horizontal contentContainerStyle={{ flex: 1, marginHorizontal: 1, justifyContent: 'center' }}>
{item.map(i => (
<View style={[styles.squre, {
width: width / colNum,
height: (height - 150) / rowNum
}]}>
<Text numberOfLines={1} style={{
fontSize: 10,
}}>{i}</Text>
</View>))}
</ScrollView>
)
}
renderTable = () => {
return (
<View>
<FlatList
data={this.state.data}
listKey={(item, index) => 'D' + index.toString()}
keyExtractor={(item, index) => item.id}
renderItem={this.renderItem}
/>
</View>
)
}
render() {
return (
<View>
{this.renderInputs()}
{this.renderButton()}
{this.renderTable()}
</View>
)
}
}
export default App;
const styles = StyleSheet.create({
inputStyle: {
flexDirection: 'row',
justifyContent: 'space-between',
padding: 10,
alignSelf: 'center',
alignItems: 'center'
},
btn: {
alignSelf: 'center',
backgroundColor: 'green',
borderRadius: 30,
margin: 5
},
display: {
padding: 10,
color: 'white',
fontWeight: 'bold'
},
cross: { textAlign: 'center' },
squre: {
borderWidth: 1,
borderColor: 'grey',
justifyContent: 'center',
alignItems: 'center',
paddingHorizontal: 5,
},
inputText: {
width: '40%',
borderWidth: 1,
borderColor: 'grey',
borderRadius: 10
}
})