Attempt to give accessibility focus to the first item of the RecyclerView when the recycler view is updated (screen change), to improve screen reader behavior.

vector/src/main/java/im/vector/app/features/crypto/verification/self/SelfVerificationFragment.kt

@@ -21,12 +21,18 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import com.airbnb.epoxy.OnModelBuildFinishedListener
+import com.airbnb.mvrx.Fail
+import com.airbnb.mvrx.Loading
+import com.airbnb.mvrx.Success
+import com.airbnb.mvrx.Uninitialized
 import com.airbnb.mvrx.parentFragmentViewModel
 import com.airbnb.mvrx.withState
 import dagger.hilt.android.AndroidEntryPoint
 import im.vector.app.R
 import im.vector.app.core.extensions.cleanup
 import im.vector.app.core.extensions.configureWith
+import im.vector.app.core.extensions.giveAccessibilityFocus
 import im.vector.app.core.extensions.registerStartForActivityResult
 import im.vector.app.core.platform.VectorBaseFragment
 import im.vector.app.core.utils.PERMISSIONS_FOR_TAKING_PHOTO
@@ -36,15 +42,26 @@ import im.vector.app.core.utils.registerForPermissionsResult
 import im.vector.app.databinding.BottomSheetVerificationChildFragmentBinding
 import im.vector.app.features.crypto.verification.VerificationAction
 import im.vector.app.features.qrcode.QrCodeScannerActivity
+import org.matrix.android.sdk.api.session.crypto.verification.EVerificationState
 import timber.log.Timber
 import javax.inject.Inject
 
 @AndroidEntryPoint
-class SelfVerificationFragment  : VectorBaseFragment<BottomSheetVerificationChildFragmentBinding>(),
+class SelfVerificationFragment : VectorBaseFragment<BottomSheetVerificationChildFragmentBinding>(),
         SelfVerificationController.InteractionListener {
 
     @Inject lateinit var controller: SelfVerificationController
 
+    private var requestAccessibilityFocus: Boolean = false
+    private val modelBuildListener: OnModelBuildFinishedListener = OnModelBuildFinishedListener {
+        if (requestAccessibilityFocus) {
+            // Do not use giveAccessibilityFocusOnce() here.
+            views.bottomSheetVerificationRecyclerView.layoutManager?.findViewByPosition(0)?.giveAccessibilityFocus()
+            requestAccessibilityFocus = false
+            // Note: it does not work when the recycler view is displayed for the first time, because findViewByPosition(0) is null
+        }
+    }
+
     private val viewModel by parentFragmentViewModel(SelfVerificationViewModel::class)
 
     override fun getBinding(inflater: LayoutInflater, container: ViewGroup?): BottomSheetVerificationChildFragmentBinding {
@@ -58,17 +75,22 @@ class SelfVerificationFragment  : VectorBaseFragment<BottomSheetVerificationChil
 
     override fun onDestroyView() {
         views.bottomSheetVerificationRecyclerView.cleanup()
+        controller.removeModelBuildListener(modelBuildListener)
         controller.listener = null
         super.onDestroyView()
     }
 
     private fun setupRecyclerView() {
         views.bottomSheetVerificationRecyclerView.configureWith(controller, hasFixedSize = false, disableItemAnimation = true)
+        controller.addModelBuildListener(modelBuildListener)
         controller.listener = this
     }
 
     override fun invalidate() = withState(viewModel) { state ->
 //        Timber.w("VALR: invalidate with State: ${state.pendingRequest}")
+        if (state.isNewScreen()) {
+            requestAccessibilityFocus = true
+        }
         controller.update(state)
     }
 
@@ -176,4 +198,41 @@ class SelfVerificationFragment  : VectorBaseFragment<BottomSheetVerificationChil
     override fun declineRequest() {
         viewModel.handle(VerificationAction.CancelPendingVerification)
     }
+
+    private var currentScreenIndex = -1
+
+    private fun SelfVerificationViewState.isNewScreen(): Boolean {
+        val newIndex = toScreenIndex()
+        if (currentScreenIndex == newIndex) {
+            return false
+        }
+        currentScreenIndex = newIndex
+        return true
+    }
+
+    private fun SelfVerificationViewState.toScreenIndex(): Int {
+        return if (activeAction !is UserAction.None) {
+            when (activeAction) {
+                UserAction.ConfirmCancel -> 30
+                UserAction.None -> 31
+            }
+        } else {
+            when (pendingRequest) {
+                is Fail -> 0
+                is Loading -> 1
+                is Success -> when (pendingRequest.invoke().state) {
+                    EVerificationState.WaitingForReady -> 10
+                    EVerificationState.Requested -> 11
+                    EVerificationState.Ready -> 12
+                    EVerificationState.Started -> 13
+                    EVerificationState.WeStarted -> 14
+                    EVerificationState.WaitingForDone -> 15
+                    EVerificationState.Done -> 16
+                    EVerificationState.Cancelled -> 17
+                    EVerificationState.HandledByOtherSession -> 18
+                }
+                Uninitialized -> 2
+            }
+        }
+    }
 }

vector/src/main/java/im/vector/app/features/crypto/verification/user/UserVerificationFragment.kt

@@ -21,12 +21,18 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import com.airbnb.epoxy.OnModelBuildFinishedListener
+import com.airbnb.mvrx.Fail
+import com.airbnb.mvrx.Loading
+import com.airbnb.mvrx.Success
+import com.airbnb.mvrx.Uninitialized
 import com.airbnb.mvrx.parentFragmentViewModel
 import com.airbnb.mvrx.withState
 import dagger.hilt.android.AndroidEntryPoint
 import im.vector.app.R
 import im.vector.app.core.extensions.cleanup
 import im.vector.app.core.extensions.configureWith
+import im.vector.app.core.extensions.giveAccessibilityFocus
 import im.vector.app.core.extensions.registerStartForActivityResult
 import im.vector.app.core.platform.VectorBaseFragment
 import im.vector.app.core.utils.PERMISSIONS_FOR_TAKING_PHOTO
@@ -36,6 +42,7 @@ import im.vector.app.core.utils.registerForPermissionsResult
 import im.vector.app.databinding.BottomSheetVerificationChildFragmentBinding
 import im.vector.app.features.crypto.verification.VerificationAction
 import im.vector.app.features.qrcode.QrCodeScannerActivity
+import org.matrix.android.sdk.api.session.crypto.verification.EVerificationState
 import timber.log.Timber
 import javax.inject.Inject
 
@@ -45,6 +52,16 @@ class UserVerificationFragment : VectorBaseFragment<BottomSheetVerificationChild
 
     @Inject lateinit var controller: UserVerificationController
 
+    private var requestAccessibilityFocus: Boolean = false
+    private val modelBuildListener: OnModelBuildFinishedListener = OnModelBuildFinishedListener {
+        if (requestAccessibilityFocus) {
+            // Do not use giveAccessibilityFocusOnce() here.
+            views.bottomSheetVerificationRecyclerView.layoutManager?.findViewByPosition(0)?.giveAccessibilityFocus()
+            requestAccessibilityFocus = false
+            // Note: it does not work when the recycler view is displayed for the first time, because findViewByPosition(0) is null
+        }
+    }
+
     private val viewModel by parentFragmentViewModel(UserVerificationViewModel::class)
 
     override fun getBinding(inflater: LayoutInflater, container: ViewGroup?): BottomSheetVerificationChildFragmentBinding {
@@ -58,17 +75,22 @@ class UserVerificationFragment : VectorBaseFragment<BottomSheetVerificationChild
 
     override fun onDestroyView() {
         views.bottomSheetVerificationRecyclerView.cleanup()
+        controller.removeModelBuildListener(modelBuildListener)
         controller.listener = null
         super.onDestroyView()
     }
 
     private fun setupRecyclerView() {
         views.bottomSheetVerificationRecyclerView.configureWith(controller, hasFixedSize = false, disableItemAnimation = true)
+        controller.addModelBuildListener(modelBuildListener)
         controller.listener = this
     }
 
     override fun invalidate() = withState(viewModel) { state ->
 //        Timber.w("VALR: invalidate with State: ${state.pendingRequest}")
+        if (state.isNewScreen()) {
+            requestAccessibilityFocus = true
+        }
         controller.update(state)
     }
 
@@ -142,10 +164,40 @@ class UserVerificationFragment : VectorBaseFragment<BottomSheetVerificationChild
     }
 
     override fun onUserDeniesQrCodeScanned() {
-       viewModel.handle(VerificationAction.OtherUserDidNotScanned)
+        viewModel.handle(VerificationAction.OtherUserDidNotScanned)
     }
 
     override fun onUserConfirmsQrCodeScanned() {
         viewModel.handle(VerificationAction.OtherUserScannedSuccessfully)
     }
+
+    private var currentScreenIndex = -1
+
+    private fun UserVerificationViewState.isNewScreen(): Boolean {
+        val newIndex = toScreenIndex()
+        if (currentScreenIndex == newIndex) {
+            return false
+        }
+        currentScreenIndex = newIndex
+        return true
+    }
+
+    private fun UserVerificationViewState.toScreenIndex(): Int {
+        return when (pendingRequest) {
+            is Fail -> 0
+            is Loading -> 1
+            is Success -> when (pendingRequest.invoke().state) {
+                EVerificationState.WaitingForReady -> 10
+                EVerificationState.Requested -> 11
+                EVerificationState.Ready -> 12
+                EVerificationState.Started -> 13
+                EVerificationState.WeStarted -> 14
+                EVerificationState.WaitingForDone -> 15
+                EVerificationState.Done -> 16
+                EVerificationState.Cancelled -> 17
+                EVerificationState.HandledByOtherSession -> 18
+            }
+            Uninitialized -> 2
+        }
+    }
 }