The React Native Flatlist fails to dynamically adjust the width of the rendered items

I'm currently working on building a messaging interface using a flatlist and a message bubble style from the Nachos-ui UI kit. However, I'm facing some challenges in getting the flatlist to display text bubbles with varying widths based on the length of the text. Initially, when sending a message, the bubble width appears to be adequate:

https://i.sstatic.net/OYO2n.png

But, when sending another message, although not very clear in the images, it alters the width of the previous message and confines the new message within what seems to be a maximum width:

https://i.sstatic.net/0eDwT.png

Below is the code snippet for the flatlist:

<FlatList
          data={this.state.messages}
          style={{marginLeft: 280}}
          ref={ref => this.flatList = ref}
          onContentSizeChange={() => this.flatList.scrollToEnd({animated: true})}
          onLayout={() => this.flatList.scrollToEnd({animated:true})}
          keyExtractor = {item => item.timestamp}
          renderItem={({item}) => <Bubble style={{marginTop: 20}} color="#FFC800"
           >{item.contents}</Bubble>}
        />

In order to diagnose the issue, it might be useful to also provide the code for the entire component:

<KeyboardAvoidingView style={styles.container} 
      behavior="padding"
      keyboardVerticalOffset={64}>
      <KeyboardAvoidingView style={styles.inputContainer}>

      <FlatList
          data={this.state.messages}
          style={{marginLeft: 280}}
          ref={ref => this.flatList = ref}
          onContentSizeChange={() => this.flatList.scrollToEnd({animated: true})}
          onLayout={() => this.flatList.scrollToEnd({animated:true})}
          keyExtractor = {item => item.timestamp}
          renderItem={({item}) => <Bubble style={{marginTop: 20}} color="#FFC800"
           >{item.contents}</Bubble>}
        />
      <View style={{flexDirection:'row', backgroundColor: 'transparent'}}>
      <Input
        containerStyle={{marginVertical: 10, width:300, marginLeft: 20}}
        inputStyle={styles.textInput}
        keyboardAppearance="dark"
        placeholder=""
        autoCorrect={false}
        onChangeText={(message) => { this.setState({message})}}
        value={this.state.message}
        />
        <Button 
          buttonStyle={{borderRadius: 25, marginTop: 40, marginLeft: 10, paddingVertical: 5, backgroundColor: "#9214FF"}}
          icon={{name: 'arrow-up', type: 'feather', color:'white'}}
          onPress={()=>{Keyboard.dismiss; this.onPressButton()}} 
          title=""/> 
        </View>
        </KeyboardAvoidingView>
      </KeyboardAvoidingView>

Is there a way to make the flatlist render each message with a dynamic size based on the text length without affecting previous messages and without a predefined maximum width?

Answer №1

You are encountering a problem with the styling of your FlatList component:

style={{marginLeft: 280}}

This is causing all your items to be compressed on the right side, resulting in the same width for all.

A more optimal solution would be to eliminate the marginLeft property and instead align the bubbles on the right like this:

<FlatList style= {{ alignItems: 'flex-end' }} ...>

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