Created
June 1, 2018 23:28
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| open class BaseAdapter<T>(diffcallback: DiffUtil.ItemCallback<T>) : PagedListAdapter<T, BaseViewHolder>(diffcallback) { | |
| protected val delegateManager: DelegateManager<T> = DelegateManager() | |
| protected fun useItemViewDelegateManager(): Boolean = delegateManager.delegateCount > 0 | |
| override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder = | |
| BaseViewHolder.createHolder(delegateManager.getItemViewDelegate(viewType).itemViewLayoutView) | |
| override fun onBindViewHolder(holder: BaseViewHolder, position: Int) = | |
| convert(holder, getItem(position)!!) | |
| override fun getItemViewType(position: Int): Int = if (!useItemViewDelegateManager()) | |
| super.getItemViewType(position) | |
| else delegateManager.getItemViewType(getItem(position)!!, position) | |
| fun convert(holder: BaseViewHolder, item: T) = delegateManager.convert(holder, item, holder.adapterPosition) | |
| fun addItemViewDelegate(delegate: DelegateType<T>) = delegateManager.addDelegate(delegate) | |
| fun addItemViewDelegate(viewTyoe: Int, delegate: DelegateType<T>) = delegateManager.addDelegate(viewTyoe, delegate) | |
| } |
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| class BaseViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { | |
| companion object { | |
| fun createHolder(itemView: View): BaseViewHolder = BaseViewHolder(itemView) | |
| fun createHolder(parent: ViewGroup, layout: Int): BaseViewHolder { | |
| val itemView = LayoutInflater.from(parent.context).inflate(layout, parent, false) | |
| return BaseViewHolder(itemView) | |
| } | |
| } | |
| } |
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| class DelegateManager<T> { | |
| val delegates: SparseArrayCompat<DelegateType<T>> = SparseArrayCompat() | |
| val delegateCount: Int | |
| get() = delegates.size() | |
| fun getItemViewType(item: T, position: Int): Int { | |
| (0 until delegateCount) | |
| .filter { delegates.valueAt(it).isItemViewType(item, position) } | |
| .forEach { return delegates.keyAt(it) } | |
| throw IllegalArgumentException( | |
| "No ItemViewDelegate added that matches position = $position in data = $item source"); | |
| } | |
| fun convert(holder: BaseViewHolder, item: T, position: Int) { | |
| for (i in 0 until delegateCount) { | |
| val delegate = delegates.valueAt(i) | |
| if (delegate.isItemViewType(item, position)) { | |
| delegate.convert(holder, item, position); | |
| return@convert | |
| } | |
| } | |
| throw IllegalArgumentException( | |
| "No ItemViewDelegateManager added that matches position= $position in data = $item source") | |
| } | |
| fun addDelegate(delegate: DelegateType<T>): DelegateManager<T> { | |
| for (i in 0 until delegateCount) { | |
| if (delegates.valueAt(i).itemViewLayoutView == delegate.itemViewLayoutView) { | |
| throw IllegalArgumentException("An ItemViewDelegate is already registered for the delegate = $delegate.") | |
| } | |
| // if (delegates.valueAt(i).itemViewLayoutId == delegate.itemViewLayoutId) { | |
| // throw IllegalArgumentException("An ItemViewDelegate is already registered for the delegate = $delegate.") | |
| // } | |
| } | |
| delegates.put(delegates.size(), delegate) | |
| return this | |
| } | |
| fun addDelegate(viewType: Int, delegate: DelegateType<T>): DelegateManager<T> { | |
| if (delegates.get(viewType) != null) { | |
| throw IllegalArgumentException("An ItemViewDelegate is already registered for the viewType = $viewType. Already registered ItemViewDelegate is ${delegates.get(viewType)}") | |
| } | |
| delegates.put(viewType, delegate) | |
| return this | |
| } | |
| fun removeDelegate(delegate: DelegateType<T>): DelegateManager<T> { | |
| val indexToRemove = delegates.indexOfValue(delegate) | |
| if (indexToRemove >= 0) { | |
| delegates.removeAt(indexToRemove) | |
| } | |
| return this | |
| } | |
| fun removeDelegate(viewType: Int): DelegateManager<T> { | |
| val indexToRemove = delegates.indexOfKey(viewType) | |
| if (indexToRemove >= 0) { | |
| delegates.removeAt(indexToRemove) | |
| } | |
| return this | |
| } | |
| fun getItemViewDelegate(viewType: Int): DelegateType<T> = delegates.get(viewType) | |
| // fun getItemViewLayoutId(viewType: Int): Int = getItemViewDelegate(viewType).itemViewLayoutId | |
| fun getItemViewType(delegate: DelegateType<T>): Int = delegates.indexOfValue(delegate) | |
| } |
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| interface DelegateType<in T> { | |
| // val itemViewLayoutId: Int | |
| val itemViewLayoutView: View | |
| fun isItemViewType(item: T, position: Int): Boolean | |
| fun convert(holder: BaseViewHolder, item: T, position: Int) | |
| } |
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