[ListView] releases responder to parent

[jbuffin]

I have a ListView nested inside a View.

<View style={styles.container} {...this._panGesture.panHandlers}>
  <ListView
    ref="list"
    dataSource={this.state.dataSource}
    renderRow={this._renderRow}
    style={styles.list}
  />
</View>

The outer View has a PanResponder. The ListView is not blocking the parent from taking the gesture responder but is releasing control to the parent View on move which causes the ListView to not be scrollable.

[jbuffin]

see https://github.com/jbuffin/ListViewPanResponderBug for example code

[magicismight]

Try onMoveShouldSetPanResponderCapture and onStartShouldSetPanResponderCapture
return true will capture the responder

[jbuffin]

@magicismight If I understand on*ShouldSetPanResponderCapture its purpose is to capture the responder at the higher level. The default behavior is that the lowest level responder should capture the responder and not bubble up to the higher level. That is exactly the bug here. The ListView is allowing the responder to bubble up to the View's PanResponder

[LightningK0ala]

+1

[LightningK0ala]

In your outer View component style, set flex: 1. This solved it for me.

[jbuffin]

if you look at https://github.com/jbuffin/ListViewPanResponderBug/blob/master/index.ios.js, you will see that I already have flex: 1 set on the outer View component.

[christopherabouabdo]

@jbuffin I ran into this issue today and found that if you overwrite a couple of the responders on the ListView's ScrollResponder you can convince it to hold on to the gesture. I added a few lines to your componentDidMount function that will tell the ListView to capture all gestures by default and to deny any termination requests unless you're scrolled to the top of the list. You can swap the logic in scrollResponderHandleTerminationRequest to handle whatever case you need.

componentDidMount() {
  this.setState({
    dataSource: this.state.dataSource.cloneWithRows(new Array(25).fill('hello')),
  });

  // Tell ListView not to give up the gesture so easy
  Object.assign(this.refs.list.getScrollResponder(), {
    scrollResponderHandleStartShouldSetResponder: () => true,
    scrollResponderHandleTerminationRequest: () => {
      // Release the gesture if scroll content is at the top
      return this.refs.list.scrollProperties.offset < 1
    },
  });
},

EDIT: I swapped in scrollResponderHandleStartShouldSetResponder in place of scrollResponderHandleStartShouldSetResponderCapture so you don't end up eating up all the touch events from child elements in the ListView.

[mkonicek]

Hi there! This issue is being closed because it has been inactive for a while.

But don't worry, it will live on with ProductPains! Check out its new home: https://productpains.com/post/react-native/listview-releases-responder-to-parent

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