[Bulk Update Orders] Enable multiple selection in Order List

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/orders/OrderSelectionItemkeyProvider.kt

@@ -0,0 +1,26 @@
+package com.woocommerce.android.ui.orders
+
+import androidx.recyclerview.selection.ItemKeyProvider
+import androidx.recyclerview.widget.RecyclerView
+import com.woocommerce.android.ui.orders.list.OrderListAdapter
+import com.woocommerce.android.ui.orders.list.OrderListItemUIType
+
+/**
+ * Class provides the selection library access to stable selection keys and identifying items
+ * presented by a [RecyclerView] instance.
+ */
+class OrderSelectionItemKeyProvider(private val recyclerView: RecyclerView) :
+    ItemKeyProvider<Long>(SCOPE_MAPPED) {
+    override fun getKey(position: Int): Long? {
+        return (recyclerView.adapter as? OrderListAdapter)?.currentList?.get(position)?.let { item ->
+            if (item is OrderListItemUIType.OrderListItemUI) item.orderId else null
+        }
+    }
+
+    override fun getPosition(key: Long): Int {
+        return (recyclerView.adapter as? OrderListAdapter)?.currentList
+            ?.indexOfFirst { item ->
+                item is OrderListItemUIType.OrderListItemUI && item.orderId == key
+            } ?: RecyclerView.NO_POSITION
+    }
+}

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/orders/SelectableOrderListItemLookup.kt

@@ -0,0 +1,58 @@
+package com.woocommerce.android.ui.orders
+
+import android.view.MotionEvent
+import androidx.recyclerview.selection.ItemDetailsLookup
+import androidx.recyclerview.widget.RecyclerView
+import com.woocommerce.android.ui.orders.list.OrderListAdapter
+import com.woocommerce.android.ui.orders.list.OrderListItemUIType.OrderListItemUI
+
+class SelectableOrderListItemLookup(private val recyclerView: RecyclerView) : ItemDetailsLookup<Long>() {
+    override fun getItemDetails(event: MotionEvent): ItemDetails<Long>? =
+        recyclerView
+            .findChildViewUnder(event.x, event.y)
+            ?.let { view ->
+                recyclerView.getChildViewHolder(view)?.let { viewHolder ->
+                    val position = viewHolder.bindingAdapterPosition
+                    val item = (recyclerView.adapter as? OrderListAdapter)?.currentList?.get(position)
+                    if (item is OrderListItemUI) {
+                        SelectableOrderItemDetailsLookup(position, item.orderId)
+                    } else {
+                        null
+                    }
+                }
+            }
+}
+
+class DefaultOrderListItemLookup(private val recyclerView: RecyclerView) : ItemDetailsLookup<Long>() {
+    override fun getItemDetails(event: MotionEvent): ItemDetails<Long>? =
+        recyclerView
+            .findChildViewUnder(event.x, event.y)
+            ?.let { view ->
+                recyclerView.getChildViewHolder(view)?.let { viewHolder ->
+                    val position = viewHolder.bindingAdapterPosition
+                    val item = (recyclerView.adapter as? OrderListAdapter)?.currentList?.get(position)
+                    if (item is OrderListItemUI) {
+                        DefaultOrderItemDetailsLookup(position, item.orderId)
+                    } else {
+                        null
+                    }
+                }
+            }
+}
+
+class DefaultOrderItemDetailsLookup(
+    private val position: Int,
+    private val orderId: Long
+) : ItemDetailsLookup.ItemDetails<Long>() {
+    override fun getPosition() = position
+    override fun getSelectionKey() = orderId
+}
+
+class SelectableOrderItemDetailsLookup(
+    private val position: Int,
+    private val orderId: Long
+) : ItemDetailsLookup.ItemDetails<Long>() {
+    override fun getPosition() = position
+    override fun getSelectionKey() = orderId
+    override fun inSelectionHotspot(e: MotionEvent) = true
+}

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/orders/list/OrderListAdapter.kt

@@ -7,6 +7,7 @@ import android.view.ViewGroup
 import androidx.core.view.ViewCompat
 import androidx.paging.PagedList
 import androidx.paging.PagedListAdapter
+import androidx.recyclerview.selection.SelectionTracker
 import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import androidx.recyclerview.widget.RecyclerView.ViewHolder
@@ -36,6 +37,7 @@ class OrderListAdapter(
 
     var activeOrderStatusMap: Map<String, WCOrderStatusModel> = emptyMap()
     var allOrderIds: List<Long> = listOf()
+    var tracker: SelectionTracker<Long>? = null
 
     override fun getItemViewType(position: Int): Int {
         return when (getItem(position)) {
@@ -165,6 +167,15 @@ class OrderListAdapter(
             )
             viewBinding.divider.visibility = if (orderItemUI.isLastItemInSection) View.GONE else View.VISIBLE
 
+            val isSelected = tracker?.isSelected(orderItemUI.orderId) ?: orderItemUI.isSelected
+            viewBinding.orderItemLayout.setBackgroundColor(
+                if (isSelected) {
+                    viewBinding.root.context.getColor(R.color.color_item_selected)
+                } else {
+                    Color.TRANSPARENT
+                }
+            )
+
             when {
                 orderItemUI.isSelected -> {
                     viewBinding.orderItemLayout.setBackgroundColor(

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/orders/list/OrderListFragment.kt

@@ -21,6 +21,8 @@ import androidx.navigation.findNavController
 import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.fragment.findNavController
 import androidx.paging.PagedList
+import androidx.recyclerview.selection.SelectionTracker
+import androidx.recyclerview.selection.StorageStrategy
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.transition.TransitionManager
 import com.google.android.material.floatingactionbutton.FloatingActionButton
@@ -58,15 +60,19 @@ import com.woocommerce.android.ui.jitm.JitmMessagePathsProvider
 import com.woocommerce.android.ui.main.AppBarStatus
 import com.woocommerce.android.ui.main.MainActivity
 import com.woocommerce.android.ui.main.MainNavigationRouter
+import com.woocommerce.android.ui.orders.DefaultOrderListItemLookup
+import com.woocommerce.android.ui.orders.OrderSelectionItemKeyProvider
 import com.woocommerce.android.ui.orders.OrderStatusUpdateSource
 import com.woocommerce.android.ui.orders.OrdersCommunicationViewModel
 import com.woocommerce.android.ui.orders.creation.CodeScannerStatus
 import com.woocommerce.android.ui.orders.creation.GoogleBarcodeFormatMapper.BarcodeFormat
 import com.woocommerce.android.ui.orders.creation.OrderCreateEditViewModel
 import com.woocommerce.android.ui.orders.list.OrderListViewModel.OrderListEvent.ShowErrorSnack
 import com.woocommerce.android.ui.orders.list.OrderListViewModel.OrderListEvent.ShowOrderFilters
+import com.woocommerce.android.ui.products.MutableMultipleSelectionPredicate
 import com.woocommerce.android.util.ChromeCustomTabUtils
 import com.woocommerce.android.util.CurrencyFormatter
+import com.woocommerce.android.util.FeatureFlag
 import com.woocommerce.android.viewmodel.MultiLiveEvent
 import com.woocommerce.android.widgets.WCEmptyView.EmptyViewType
 import dagger.hilt.android.AndroidEntryPoint
@@ -108,6 +114,8 @@ class OrderListFragment :
     @Inject
     lateinit var feedbackPrefs: FeedbackPrefs
 
+    private var tracker: SelectionTracker<Long>? = null
+    private val selectionPredicate = MutableMultipleSelectionPredicate<Long>()
     private val viewModel: OrderListViewModel by viewModels()
     private val communicationViewModel: OrdersCommunicationViewModel by activityViewModels()
     private var snackBar: Snackbar? = null
@@ -239,6 +247,36 @@ class OrderListFragment :
         binding.orderFiltersCard.setClickListener { viewModel.onFiltersButtonTapped() }
         initCreateOrderFAB(binding.createOrderButton)
         initSwipeBehaviour()
+
+        if (FeatureFlag.BULK_UPDATE_ORDERS_STATUS.isEnabled()) {
+            addSelectionTracker()
+        }
+    }
+
+    private fun addSelectionTracker() {
+        tracker = SelectionTracker.Builder(
+            "orderSelection", // a string to identify our selection in the context of this fragment
+            binding.orderListView.ordersList, // the RecyclerView where we will apply the tracker
+            OrderSelectionItemKeyProvider(binding.orderListView.ordersList), // the source of selection keys
+            DefaultOrderListItemLookup(
+                binding.orderListView.ordersList
+            ), // the source of information about recycler items
+            StorageStrategy.createLongStorage() // strategy for type-safe storage of the selection state
+        ).withSelectionPredicate(selectionPredicate)
+            .build()
+
+        binding.orderListView.adapter.tracker = tracker // Use the new property
+
+        tracker?.addObserver(
+            object : SelectionTracker.SelectionObserver<Long>() {
+                override fun onSelectionChanged() {
+                    val selectionCount = tracker?.selection?.size() ?: 0
+                    // TODO: add onSelectionChanged handling to OrderListViewModel
+                    // Temporarily showing toast instead to debug size selection
+                    ToastUtils.showToast(context, "Current selection count: $selectionCount")
+                }
+            }
+        )
     }
 
     private fun setupToolbar() {

WooCommerce/src/main/kotlin/com/woocommerce/android/ui/orders/list/OrderListView.kt

@@ -29,6 +29,9 @@ class OrderListView @JvmOverloads constructor(
     val ordersList
         get() = binding.ordersList
 
+    val adapter: OrderListAdapter
+        get() = ordersAdapter
+
     fun init(
         currencyFormatter: CurrencyFormatter,
         orderListListener: OrderListListener