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Change order of args to enable trailing lambda syntax
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package com.nickrout.snaphelperlistener | |
import androidx.recyclerview.widget.RecyclerView | |
import androidx.recyclerview.widget.SnapHelper | |
class SnapOnScrollListener( | |
private val snapHelper: SnapHelper, | |
var behavior: Behavior = Behavior.NOTIFY_ON_SCROLL, | |
var onSnapPositionChangeListener: OnSnapPositionChangeListener? = null | |
) : RecyclerView.OnScrollListener() { | |
enum class Behavior { | |
NOTIFY_ON_SCROLL, | |
NOTIFY_ON_SCROLL_STATE_IDLE | |
} | |
private var snapPosition = RecyclerView.NO_POSITION | |
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { | |
if (behavior == Behavior.NOTIFY_ON_SCROLL) { | |
maybeNotifySnapPositionChange(recyclerView) | |
} | |
} | |
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) { | |
if (behavior == Behavior.NOTIFY_ON_SCROLL_STATE_IDLE | |
&& newState == RecyclerView.SCROLL_STATE_IDLE) { | |
maybeNotifySnapPositionChange(recyclerView) | |
} | |
} | |
private fun maybeNotifySnapPositionChange(recyclerView: RecyclerView) { | |
val snapPosition = snapHelper.getSnapPosition(recyclerView) | |
val snapPositionChanged = this.snapPosition != snapPosition | |
if (snapPositionChanged) { | |
onSnapPositionChangeListener?.onSnapPositionChange(snapPosition) | |
this.snapPosition = snapPosition | |
} | |
} | |
} |
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