package com.example.firstapp.util
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import androidx.recyclerview.widget.ItemTouchHelper
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import androidx.recyclerview.widget.RecyclerView
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import com.example.firstapp.adapter.CategorySelectorAdapter
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/**
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* 拖拽回调
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*/
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class CategoryDragCallback(private val adapter: CategorySelectorAdapter) : ItemTouchHelper.Callback() {
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override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
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val dragFlags = ItemTouchHelper.UP or ItemTouchHelper.DOWN
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return makeMovementFlags(dragFlags, 0)
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}
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override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
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adapter.moveItem(viewHolder.adapterPosition, target.adapterPosition)
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return true
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}
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override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
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// 不需要实现
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}
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}
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