#168 implement UI for sorting vault list. Backend still WIP

presentation/src/main/java/org/cryptomator/presentation/presenter/VaultListPresenter.kt

@@ -603,6 +603,17 @@ class VaultListPresenter @Inject constructor( //
 		view?.showDialog(AppIsObscuredInfoDialog.newInstance())
 	}
 
+	fun onVaultMoved(fromPosition: Int, toPosition: Int) {
+		// FIXME insert position int into the db and update here
+
+		getVaultListUseCase.run(object : DefaultResultHandler<List<Vault>>() {
+			override fun onSuccess(vaults: List<Vault>) {
+				val vaultModels = vaults.mapTo(ArrayList()) { VaultModel(it) }
+				view?.vaultMoved(fromPosition, toPosition, vaultModels)
+			}
+		})
+	}
+
 	fun onBiometricAuthenticationSucceeded(vaultModel: VaultModel) {
 		if (changedVaultPassword) {
 			changedVaultPassword = false

presentation/src/main/java/org/cryptomator/presentation/ui/activity/VaultListActivity.kt

@@ -150,6 +150,10 @@ class VaultListActivity : BaseActivity(), //
 		return biometricAuthentication?.stoppedBiometricAuthDuringCloudAuthentication() == true
 	}
 
+	override fun vaultMoved(fromPosition: Int, toPosition: Int, vaultModelCollection: List<VaultModel>) {
+		vaultListFragment().vaultMoved(fromPosition, toPosition, vaultModelCollection)
+	}
+
 	override fun showVaultSettingsDialog(vaultModel: VaultModel) {
 		val vaultSettingDialog = //
 				SettingsVaultBottomSheet.newInstance(vaultModel)

presentation/src/main/java/org/cryptomator/presentation/ui/activity/view/VaultListView.kt

@@ -23,5 +23,5 @@ interface VaultListView : View {
 	fun isVaultLocked(vaultModel: VaultModel): Boolean
 	fun cancelBasicAuthIfRunning()
 	fun stoppedBiometricAuthDuringCloudAuthentication(): Boolean
-
+	fun vaultMoved(fromPosition: Int, toPosition: Int, vaultModelCollection: List<VaultModel>)
 }

presentation/src/main/java/org/cryptomator/presentation/ui/adapter/VaultsAdapter.kt

@@ -8,14 +8,16 @@ import org.cryptomator.presentation.ui.adapter.VaultsAdapter.VaultViewHolder
 import javax.inject.Inject
 
 class VaultsAdapter @Inject
-internal constructor() : RecyclerViewBaseAdapter<VaultModel, VaultsAdapter.OnItemClickListener, VaultViewHolder>() {
+internal constructor() : RecyclerViewBaseAdapter<VaultModel, VaultsAdapter.OnItemInteractionListener, VaultViewHolder>(), VaultsMoveListener.Listener {
 
-	interface OnItemClickListener {
+	interface OnItemInteractionListener {
 		fun onVaultClicked(vaultModel: VaultModel)
 
 		fun onVaultSettingsClicked(vaultModel: VaultModel)
 
 		fun onVaultLockClicked(vaultModel: VaultModel)
+
+		fun onVaultMoved(fromPosition: Int, toPosition: Int)
 	}
 
 	override fun getItemLayout(viewType: Int): Int {
@@ -65,4 +67,8 @@ internal constructor() : RecyclerViewBaseAdapter<VaultModel, VaultsAdapter.OnIte
 			itemView.settings.setOnClickListener { callback.onVaultSettingsClicked(vaultModel) }
 		}
 	}
+
+	override fun onRowMoved(fromPosition: Int, toPosition: Int) {
+		callback.onVaultMoved(fromPosition, toPosition)
+	}
 }

presentation/src/main/java/org/cryptomator/presentation/ui/adapter/VaultsMoveListener.kt

@@ -0,0 +1,32 @@
+package org.cryptomator.presentation.ui.adapter
+
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.RecyclerView
+
+class VaultsMoveListener(val adapter: VaultsAdapter) : ItemTouchHelper.Callback() {
+
+	override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
+		val dragFlags = ItemTouchHelper.UP or ItemTouchHelper.DOWN
+		return makeMovementFlags(dragFlags, 0)
+	}
+
+	override fun isItemViewSwipeEnabled(): Boolean {
+		return false
+	}
+
+	override fun isLongPressDragEnabled(): Boolean {
+		return true
+	}
+
+	override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
+		adapter.onRowMoved(viewHolder.adapterPosition, target.adapterPosition)
+		return true
+	}
+
+	override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
+	}
+
+	interface Listener {
+		fun onRowMoved(fromPosition: Int, toPosition: Int)
+	}
+}

presentation/src/main/java/org/cryptomator/presentation/ui/fragment/VaultListFragment.kt

@@ -2,6 +2,7 @@ package org.cryptomator.presentation.ui.fragment
 
 import android.util.TypedValue
 import android.view.View
+import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
 import kotlinx.android.synthetic.main.fragment_vault_list.*
 import kotlinx.android.synthetic.main.recycler_view_layout.*
@@ -11,6 +12,8 @@ import org.cryptomator.presentation.R
 import org.cryptomator.presentation.model.VaultModel
 import org.cryptomator.presentation.presenter.VaultListPresenter
 import org.cryptomator.presentation.ui.adapter.VaultsAdapter
+import org.cryptomator.presentation.ui.adapter.VaultsMoveListener
+import java.util.*
 import javax.inject.Inject
 
 @Fragment(R.layout.fragment_vault_list)
@@ -22,7 +25,9 @@ class VaultListFragment : BaseFragment() {
 	@Inject
 	lateinit var vaultsAdapter: VaultsAdapter
 
-	private val onItemClickListener = object : VaultsAdapter.OnItemClickListener {
+	lateinit var touchHelper: ItemTouchHelper
+
+	private val onItemClickListener = object : VaultsAdapter.OnItemInteractionListener {
 		override fun onVaultClicked(vaultModel: VaultModel) {
 			vaultListPresenter.onVaultClicked(vaultModel)
 		}
@@ -34,7 +39,12 @@ class VaultListFragment : BaseFragment() {
 		override fun onVaultLockClicked(vaultModel: VaultModel) {
 			vaultListPresenter.onVaultLockClicked(vaultModel)
 		}
+
+		override fun onVaultMoved(fromPosition: Int, toPosition: Int) {
+			vaultListPresenter.onVaultMoved(fromPosition, toPosition)
 		}
+	}
+
 
 	override fun setupView() {
 		setupRecyclerView()
@@ -48,6 +58,9 @@ class VaultListFragment : BaseFragment() {
 
 	private fun setupRecyclerView() {
 		vaultsAdapter.setCallback(onItemClickListener)
+		touchHelper = ItemTouchHelper(VaultsMoveListener(vaultsAdapter))
+		touchHelper.attachToRecyclerView(recyclerView)
+
 		recyclerView.layoutManager = LinearLayoutManager(context())
 		recyclerView.adapter = vaultsAdapter
 		recyclerView.setHasFixedSize(true) // smoother scrolling
@@ -83,5 +96,19 @@ class VaultListFragment : BaseFragment() {
 		vaultsAdapter.addOrUpdateVault(vaultModel)
 	}
 
+	fun vaultMoved(fromPosition: Int, toPosition: Int, vaultModelCollection: List<VaultModel>?) {
+		if (fromPosition < toPosition) {
+			for (i in fromPosition until toPosition) {
+				Collections.swap(vaultModelCollection, i, i + 1)
+			}
+		} else {
+			for (i in fromPosition downTo toPosition + 1) {
+				Collections.swap(vaultModelCollection, i, i - 1)
+			}
+		}
+
+		vaultsAdapter.notifyItemMoved(fromPosition, toPosition)
+	}
+
 	fun rootView(): View = coordinatorLayout
 }