package com.example.firstapp.adapter
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import android.view.LayoutInflater
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import android.view.ViewGroup
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import androidx.recyclerview.widget.RecyclerView
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import com.example.firstapp.databinding.ItemCategorySelectorBinding
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import com.example.firstapp.model.CategoryConfig
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import java.util.Collections
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/**
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* Adapter for the category selector recycler view.分类选择的适配器
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*/
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class CategorySelectorAdapter : RecyclerView.Adapter<CategorySelectorAdapter.ViewHolder>() {
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private var categories = mutableListOf<CategoryConfig>()
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private var lastCheckedPosition = -1 // 记录最后一个选中的位置
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class ViewHolder(val binding: ItemCategorySelectorBinding) : RecyclerView.ViewHolder(binding.root)
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override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
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val binding = ItemCategorySelectorBinding.inflate(
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LayoutInflater.from(parent.context), parent, false
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)
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return ViewHolder(binding)
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}
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override fun onBindViewHolder(holder: ViewHolder, position: Int) {
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val category = categories[position]
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holder.binding.apply {
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categoryName.text = category.name
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categoryCheckBox.isChecked = category.isEnabled
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// 如果只有一个选中的项，禁用其复选框
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categoryCheckBox.isEnabled = !(getEnabledCount() == 1 && category.isEnabled)
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categoryCheckBox.setOnCheckedChangeListener { _, isChecked ->
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if (isChecked || getEnabledCount() > 1) {
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categories[position] = category.copy(isEnabled = isChecked)
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notifyDataSetChanged() // 刷新所有项以更新禁用状态
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} else {
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// 如果要取消选中且只有一个选中项，恢复选中状态
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categoryCheckBox.isChecked = true
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}
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}
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}
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}
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private fun getEnabledCount(): Int {
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return categories.count { it.isEnabled }
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}
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override fun getItemCount() = categories.size
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fun moveItem(fromPosition: Int, toPosition: Int) {
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Collections.swap(categories, fromPosition, toPosition)
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notifyItemMoved(fromPosition, toPosition)
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}
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fun setCategories(newCategories: List<CategoryConfig>) {
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categories.clear()
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categories.addAll(newCategories)
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notifyDataSetChanged()
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}
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fun getCategories() = categories.toList()
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}
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