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PanResponder > onPanResponderMove doesn't work with Animated.event() if called inside a function #15880

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xardit opened this issue Sep 10, 2017 · 1 comment
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PanResponder > onPanResponderMove doesn't work with Animated.event() if called inside a function #15880

xardit opened this issue Sep 10, 2017 · 1 comment
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Resolution: Locked This issue was locked by the bot.

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@xardit
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xardit commented Sep 10, 2017

I have the following examples:

WORKS

// moving
onPanResponderMove: Animated.event([null, {
  dx: this.state.pan.x, // x,y are Animated.Value
  dy: this.state.pan.y,
}]),

DOESN'T WORK

// moving
onPanResponderMove: (evt, gestureState) => {
  this.props.updatePanPosition(gestureState.moveX, gestureState.moveY)

  return Animated.event([null, {
    dx: this.state.pan.x,
    dy: this.state.pan.y,
  }])
},

The pan state is an Animated.ValueXY()
I need to use the onPanResponderMove function to get latest coordinates on the screen and use it in another component

This looks like an issue!

I'm using react-native: 0.47.2
@xardit
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xardit commented Sep 10, 2017

Never mind, fixed it
Reason was because Animation.event() only generates the function which is used from onPanResponderMove, it also needs the default arguments evt, gestureState

WORKING CODE

// moving
onPanResponderMove: (evt, gestureState) => {
  this.props.updatePanPosition(gestureState.moveX, gestureState.moveY)

  return Animated.event([null, {
    dx: this.state.pan.x,
    dy: this.state.pan.y,
  }])(evt, gestureState)
},

@xardit xardit closed this as completed Sep 10, 2017
@facebook facebook locked as resolved and limited conversation to collaborators Sep 10, 2018
@react-native-bot react-native-bot added the Resolution: Locked This issue was locked by the bot. label Sep 10, 2018
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@xardit @react-native-bot