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Merge pull request #5 from egeniq-forks/bugfix/divide_by_zero

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Bugfix/divide by zero
This commit is contained in:
Little Mango
2018-11-04 20:13:23 +08:00
committed by GitHub
parent 405a0b5540 8b83050f87
commit e760183212
1 changed files with 8 additions and 1 deletions
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9
StackLayoutManager/src/main/java/com/littlemango/stacklayoutmanager/StackLayoutManager.kt
View File

@@ -2,7 +2,8 @@ package com.littlemango.stacklayoutmanager
import android.support.annotation.IntRange
import android.support.v7.widget.RecyclerView
import android.support.v7.widget.RecyclerView.*
import android.support.v7.widget.RecyclerView.SCROLL_STATE_DRAGGING
import android.support.v7.widget.RecyclerView.SCROLL_STATE_IDLE
import android.view.View
import android.view.ViewGroup
@@ -153,6 +154,9 @@ class StackLayoutManager(scrollOrientation: ScrollOrientation,
* @return 返回第一个可见 itemView 的位置.
*/
fun getFirstVisibleItemPosition(): Int {
if (width == 0 || height == 0) {
return 0
}
return when(mScrollOrientation) {
ScrollOrientation.RIGHT_TO_LEFT -> Math.floor((mScrollOffset * 1.0 / width)).toInt()
ScrollOrientation.LEFT_TO_RIGHT -> itemCount - 1 - Math.ceil((mScrollOffset * 1.0 / width)).toInt()
@@ -447,6 +451,9 @@ class StackLayoutManager(scrollOrientation: ScrollOrientation,
}
private fun getFirstVisibleItemMovePercent(): Float {
if (width == 0 || height == 0) {
return 0f
}
return when (mScrollOrientation) {
ScrollOrientation.RIGHT_TO_LEFT -> (mScrollOffset % width) * 1.0f / width
ScrollOrientation.LEFT_TO_RIGHT -> {