Implementing a long-press feature to increment a counter in React Native

Question

Implementing a long-press feature to increment a counter in React Native

Next to my TextInput, there is a button that increments its counter each time it's pressed.

   <TouchableWithoutFeedback onPress={() => {this.increaseAmount(step, rowID)}}>
      <View style={styles.amountPlusButtonContainer}>
        <Text style={styles.amountButtonText}>+</Text>
      </View>
    </TouchableWithoutFeedback>

Currently, the counter goes up by 1 with every tap of the button. I want to change it so that the counter continues to increase as long as the user holds down the button.

I attempted to solve this issue by using setInterval(), but I'm unsure of when to stop it or if this is the correct approach for this problem.

javascript android ios react-native

Answer 1

Answer №1

In my opinion, utilizing the setInterval function is a viable solution. Simply trigger setInterval during onPressIn and stop it with clearInterval upon onPressOut.

Answer 2

In my opinion, utilizing the setInterval function is a viable solution. Simply trigger setInterval during onPressIn and stop it with clearInterval upon onPressOut.

Answer 3

Answer №2

By utilizing the Animated API, I successfully implemented the functionality. In addition to consulting the official documentation, I also found guidance from a helpful resource at

   var ACTION_TIMER = 3000;
   var listenerActive = true;

   getInitialState(){
     return{
       pressAction: new Animated.Value(0),
       value: 0,
     };
   },
   componentWillMount: function() {
     this.state.pressAction.addListener((v) => this.setState({value: v.value}));
   },
   handlePressIn: function() {
     if(!listenerActive) {
       this.state.pressAction.addListener((v) => this.setValueAndChangeAmount(v.value));
       listenerActive = true;
     }
     Animated.timing(this.state.pressAction, {
         duration: ACTION_TIMER,
         toValue: 67,
     }).start();
   },
   handlePressOut: function() {
     this.state.pressAction.removeAllListeners();
     this.setState({pressAction: new Animated.Value(Math.ceil(this.state.value))});
     listenerActive = false;
   },

To maintain consistency with onPress, I relied on a timer of 3000ms and utilized Math.ceil in my implementation due to restrictions on using onPressInand onPressOut simultaneously.

The action of removing the listener in handlePressOut halts the counter. By setting a new pressAction with the current this.state.value, the value resets to where the counter was stopped.

Answer 4

By utilizing the Animated API, I successfully implemented the functionality. In addition to consulting the official documentation, I also found guidance from a helpful resource at

   var ACTION_TIMER = 3000;
   var listenerActive = true;

   getInitialState(){
     return{
       pressAction: new Animated.Value(0),
       value: 0,
     };
   },
   componentWillMount: function() {
     this.state.pressAction.addListener((v) => this.setState({value: v.value}));
   },
   handlePressIn: function() {
     if(!listenerActive) {
       this.state.pressAction.addListener((v) => this.setValueAndChangeAmount(v.value));
       listenerActive = true;
     }
     Animated.timing(this.state.pressAction, {
         duration: ACTION_TIMER,
         toValue: 67,
     }).start();
   },
   handlePressOut: function() {
     this.state.pressAction.removeAllListeners();
     this.setState({pressAction: new Animated.Value(Math.ceil(this.state.value))});
     listenerActive = false;
   },

To maintain consistency with onPress, I relied on a timer of 3000ms and utilized Math.ceil in my implementation due to restrictions on using onPressInand onPressOut simultaneously.

The action of removing the listener in handlePressOut halts the counter. By setting a new pressAction with the current this.state.value, the value resets to where the counter was stopped.

Implementing a long-press feature to increment a counter in React Native

Answer №1

Answer №2

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