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authorAllan Wang <me@allanwang.ca>2019-10-20 00:09:20 -0700
committerAllan Wang <me@allanwang.ca>2019-10-20 00:09:20 -0700
commit2e13634663cb3c511e4aed556db06a20d8bff6f4 (patch)
treef583a09a7ab9df68fe7e7b9b21000916d7f07c38 /fastadapter-viewbinding/src/main/kotlin/ca/allanwang
parentc253ae07a96ba91fa4801039358a2bef52881c53 (diff)
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Generify data binding to view binding
Diffstat (limited to 'fastadapter-viewbinding/src/main/kotlin/ca/allanwang')
-rw-r--r--fastadapter-viewbinding/src/main/kotlin/ca/allanwang/fastadapter/viewbinding/BindingItem.kt154
1 files changed, 154 insertions, 0 deletions
diff --git a/fastadapter-viewbinding/src/main/kotlin/ca/allanwang/fastadapter/viewbinding/BindingItem.kt b/fastadapter-viewbinding/src/main/kotlin/ca/allanwang/fastadapter/viewbinding/BindingItem.kt
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@@ -0,0 +1,154 @@
+/*
+ * Copyright 2019 Allan Wang
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ca.allanwang.fastadapter.viewbinding
+
+import android.content.Context
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import androidx.viewbinding.ViewBinding
+import ca.allanwang.kau.fastadapter.databinding.R
+import ca.allanwang.kau.logging.KL
+import com.mikepenz.fastadapter.FastAdapter
+import com.mikepenz.fastadapter.GenericItem
+import com.mikepenz.fastadapter.items.AbstractItem
+import com.mikepenz.fastadapter.listeners.ClickEventHook
+
+interface VhModel {
+ fun vh(): GenericItem
+}
+
+interface BindingLayout<Binding : ViewBinding> {
+ val layoutRes: Int
+ fun createBinding(context: Context, parent: ViewGroup?): Binding
+ fun Binding.bindView(holder: ViewHolder, payloads: MutableList<Any>)
+ fun Binding.unbindView(holder: ViewHolder)
+
+ class ViewHolder(itemView: View, internal val layoutRes: Int) :
+ RecyclerView.ViewHolder(itemView) {
+
+ /**
+ * Retrieves a binding.
+ *
+ * It is assumed that the binding is set on view holder creation,
+ * and that its type matches the supplied generic.
+ */
+ fun <T> getBinding(): T = getBinding(itemView)
+ }
+
+ companion object {
+ fun setBinding(view: View, binding: Any) {
+ view.setTag(R.id.kau_view_binding_model, binding)
+ }
+
+ @Suppress("UNCHECKED_CAST")
+ fun <T> getBinding(view: View): T = view.getTag(R.id.kau_view_binding_model) as T
+ }
+}
+
+abstract class BindingItem<Binding : ViewBinding>(open val data: Any?) :
+ AbstractItem<BindingLayout.ViewHolder>(),
+ BindingLayout<Binding> {
+
+ override val type: Int
+ get() = layoutRes
+
+ override fun createView(ctx: Context, parent: ViewGroup?): View {
+ val binding = createBinding(ctx, parent)
+ BindingLayout.setBinding(binding.root, binding)
+ return binding.root
+ }
+
+ final override fun bindView(holder: BindingLayout.ViewHolder, payloads: MutableList<Any>) {
+ super.bindView(holder, payloads)
+ val binding = holder.getBinding<Binding>()
+ binding.bindView(holder, payloads)
+ }
+
+ final override fun unbindView(holder: BindingLayout.ViewHolder) {
+ super.unbindView(holder)
+ val binding = holder.getBinding<Binding>()
+ binding.unbindView(holder)
+ }
+
+ override fun Binding.unbindView(holder: BindingLayout.ViewHolder) {}
+
+ final override fun getViewHolder(v: View): BindingLayout.ViewHolder =
+ BindingLayout.ViewHolder(v, layoutRes)
+
+ override fun failedToRecycle(holder: BindingLayout.ViewHolder): Boolean {
+ KL.e { "Failed to recycle" }
+ return super.failedToRecycle(holder)
+ }
+
+ override fun equals(other: Any?): Boolean {
+ if (this === other) return true
+ if (other !is BindingItem<*>) return false
+ return identifier == other.identifier && data == other.data
+ }
+
+ override fun hashCode(): Int = data.hashCode()
+}
+
+abstract class BindingClickEventHook<Binding : ViewBinding, Item : BindingItem<Binding>>(val identifier: BindingLayout<Binding>) :
+ ClickEventHook<Item>() {
+
+ private fun RecyclerView.ViewHolder.binding(): Binding? {
+ val holder = this as? BindingLayout.ViewHolder ?: return null
+ if (holder.layoutRes != identifier.layoutRes) {
+ return null
+ }
+ return getBinding()
+ }
+
+ /**
+ * All bound views must set the view root, which will be used to find the binding.
+ * We avoid attaching the binding directly
+ */
+ private fun View.setRoot(root: View) {
+ setTag(R.id.kau_view_binding_root, root)
+ }
+
+ private fun View.findBinding(): Binding {
+ val root = getTag(R.id.kau_view_binding_root) as View
+ return BindingLayout.getBinding(root)
+ }
+
+ final override fun onBind(viewHolder: RecyclerView.ViewHolder): View? {
+ val binding = viewHolder.binding() ?: return super.onBind(viewHolder)
+ val view = binding.onBind(viewHolder) ?: return super.onBind(viewHolder)
+ view.setRoot(binding.root)
+ return view
+ }
+
+ open fun Binding.onBind(viewHolder: RecyclerView.ViewHolder): View? = super.onBind(viewHolder)
+
+ final override fun onBindMany(viewHolder: RecyclerView.ViewHolder): List<View>? {
+ val binding = viewHolder.binding() ?: return super.onBindMany(viewHolder)
+ val views = binding.onBindMany(viewHolder) ?: return super.onBindMany(viewHolder)
+ views.forEach { it.setRoot(binding.root) }
+ return views
+ }
+
+ open fun Binding.onBindMany(viewHolder: RecyclerView.ViewHolder): List<View>? =
+ super.onBindMany(viewHolder)
+
+ final override fun onClick(v: View, position: Int, fastAdapter: FastAdapter<Item>, item: Item) {
+ v.findBinding().onClick(v, position, fastAdapter, item)
+ }
+
+ abstract fun Binding.onClick(v: View, position: Int, fastAdapter: FastAdapter<Item>, item: Item)
+}