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June 11, 2018 08:46
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RecyclerView Data Binding
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| open class DataBoundAdapter<T>(val lifecycleOwner: LifecycleOwner, val itemLayoutIdProvider: (T) -> Int, val bindingVariableId: Int, diffCallback: DiffUtil.ItemCallback<T>) : ListAdapter<T, DataBoundViewHolder>(diffCallback) { | |
| constructor(lifecycleOwner: LifecycleOwner, @LayoutRes itemLayoutId: Int, bindingVariableId: Int, diffCallback: DiffUtil.ItemCallback<T>) : this(lifecycleOwner, { itemLayoutId }, bindingVariableId, diffCallback) | |
| private val extras = hashMapOf<Int, Any>() | |
| override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DataBoundViewHolder { | |
| val layoutInflater = LayoutInflater.from(parent.context) | |
| val binding = DataBindingUtil.inflate<ViewDataBinding>(layoutInflater, viewType, parent, false) | |
| binding.setLifecycleOwner(lifecycleOwner) | |
| return DataBoundViewHolder(binding) | |
| } | |
| override fun getItemViewType(position: Int) = itemLayoutIdProvider.invoke(getItem(position)) | |
| override fun onBindViewHolder(holder: DataBoundViewHolder, position: Int) { | |
| holder.binding.setVariable(bindingVariableId, getItem(position)) | |
| extras.forEach { (varId, extra) -> holder.binding.setVariable(varId, extra) } | |
| holder.binding.executePendingBindings() | |
| } | |
| fun bindExtra(bindingVariableId: Int, extra: Any) = this.also { | |
| extras.put(bindingVariableId, extra) | |
| } | |
| } | |
| class DataBoundViewHolder constructor(val binding: ViewDataBinding) : RecyclerView.ViewHolder(binding.root) | |
| @BindingAdapter("app:adapter", "app:items", requireAll = false) | |
| fun <T> RecyclerView.setDataBoundAdapter(adapter: DataBoundAdapter<T>?, items: List<T>?) { | |
| if (this.adapter == null) | |
| this.adapter = adapter | |
| (this.adapter as DataBoundAdapter<T>).submitList(items) | |
| } |
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