Fix camera-first qr scans.

app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceFragment.kt

@@ -88,7 +88,7 @@ class LinkDeviceFragment : ComposeFragment() {
 
     Scaffolds.Settings(
       title = stringResource(id = R.string.preferences__linked_devices),
-      onNavigationClick = { navController.popBackStack() },
+      onNavigationClick = { findNavController().popOrFinish() },
       navigationIconPainter = painterResource(id = R.drawable.ic_arrow_left_24),
       navigationContentDescription = stringResource(id = R.string.Material3SearchToolbar__close)
     ) { contentPadding: PaddingValues ->
@@ -103,6 +103,12 @@ class LinkDeviceFragment : ComposeFragment() {
       )
     }
   }
+
+  private fun NavController.popOrFinish() {
+    if (!popBackStack()) {
+      requireActivity().finishAfterTransition()
+    }
+  }
 }
 
 @Composable
@@ -117,7 +123,7 @@ fun DeviceDescriptionScreen(
 ) {
   if (state.progressDialogMessage != -1) {
     if (navController?.currentDestination?.id == R.id.linkDeviceFinishedSheet) {
-      navController?.popBackStack()
+      navController.popBackStack()
     }
     Dialogs.IndeterminateProgressDialog(stringResource(id = state.progressDialogMessage))
   }

app/src/main/java/org/thoughtcrime/securesms/mediasend/CameraXFragment.java

@@ -166,7 +166,8 @@ public class CameraXFragment extends LoggingFragment implements CameraFragment {
     this.controlsContainer           = view.findViewById(R.id.camerax_controls_container);
     this.cameraXModePolicy           = CameraXModePolicy.acquire(requireContext(),
                                                         controller.getMediaConstraints(),
-                                                        requireArguments().getBoolean(IS_VIDEO_ENABLED, true));
+                                                        requireArguments().getBoolean(IS_VIDEO_ENABLED, true),
+                                                        requireArguments().getBoolean(IS_QR_SCAN_ENABLED, false));
     this.missingPermissionsContainer = view.findViewById(R.id.missing_permissions_container);
     this.missingPermissionsText      = view.findViewById(R.id.missing_permissions_text);
     this.allowAccessButton           = view.findViewById(R.id.allow_access_button);

app/src/main/java/org/thoughtcrime/securesms/mediasend/camerax/CameraXModePolicy.kt

@@ -15,8 +15,18 @@ sealed class CameraXModePolicy {
 
   abstract val isVideoSupported: Boolean
 
+  abstract val isQrScanEnabled: Boolean
+
   abstract fun initialize(cameraController: CameraXController)
 
+  open fun initialize(cameraController: CameraXController, useCaseFlags: Int) {
+    if (isQrScanEnabled) {
+      cameraController.setEnabledUseCases(useCaseFlags or CameraController.IMAGE_ANALYSIS)
+    } else {
+      cameraController.setEnabledUseCases(useCaseFlags)
+    }
+  }
+
   open fun setToImage(cameraController: CameraXController) = Unit
 
   open fun setToVideo(cameraController: CameraXController) = Unit
@@ -24,19 +34,19 @@ sealed class CameraXModePolicy {
   /**
    * The device supports having Image and Video enabled at the same time
    */
-  object Mixed : CameraXModePolicy() {
+  data class Mixed(override val isQrScanEnabled: Boolean) : CameraXModePolicy() {
 
     override val isVideoSupported: Boolean = true
 
     override fun initialize(cameraController: CameraXController) {
-      cameraController.setEnabledUseCases(CameraController.IMAGE_CAPTURE or CameraController.VIDEO_CAPTURE)
+      super.initialize(cameraController, CameraController.IMAGE_CAPTURE or CameraController.VIDEO_CAPTURE)
     }
   }
 
   /**
    * The device supports image and video, but only one mode at a time.
    */
-  object Single : CameraXModePolicy() {
+  data class Single(override val isQrScanEnabled: Boolean) : CameraXModePolicy() {
 
     override val isVideoSupported: Boolean = true
 
@@ -45,29 +55,29 @@ sealed class CameraXModePolicy {
     }
 
     override fun setToImage(cameraController: CameraXController) {
-      cameraController.setEnabledUseCases(CameraController.IMAGE_CAPTURE)
+      super.initialize(cameraController, CameraController.IMAGE_CAPTURE)
     }
 
     override fun setToVideo(cameraController: CameraXController) {
-      cameraController.setEnabledUseCases(CameraController.VIDEO_CAPTURE)
+      super.initialize(cameraController, CameraController.VIDEO_CAPTURE)
     }
   }
 
   /**
    * The device supports taking images only.
    */
-  object ImageOnly : CameraXModePolicy() {
+  data class ImageOnly(override val isQrScanEnabled: Boolean) : CameraXModePolicy() {
 
     override val isVideoSupported: Boolean = false
 
     override fun initialize(cameraController: CameraXController) {
-      cameraController.setEnabledUseCases(CameraController.IMAGE_CAPTURE)
+      super.initialize(cameraController, CameraController.IMAGE_CAPTURE)
     }
   }
 
   companion object {
     @JvmStatic
-    fun acquire(context: Context, mediaConstraints: MediaConstraints, isVideoEnabled: Boolean): CameraXModePolicy {
+    fun acquire(context: Context, mediaConstraints: MediaConstraints, isVideoEnabled: Boolean, isQrScanEnabled: Boolean): CameraXModePolicy {
       val isVideoSupported = Build.VERSION.SDK_INT >= 26 &&
         isVideoEnabled &&
         MediaConstraints.isVideoTranscodeAvailable() &&
@@ -79,9 +89,9 @@ sealed class CameraXModePolicy {
         !FeatureFlags.cameraXMixedModelBlocklist().asListContains(Build.MODEL)
 
       return when {
-        isMixedModeSupported -> Mixed
+        isMixedModeSupported -> Mixed(isQrScanEnabled)
-        isVideoSupported -> Single
+        isVideoSupported -> Single(isQrScanEnabled)
-        else -> ImageOnly
+        else -> ImageOnly(isQrScanEnabled)
       }
     }
   }

app/src/main/java/org/thoughtcrime/securesms/mediasend/v2/capture/MediaCaptureFragment.kt

@@ -14,6 +14,7 @@ import org.signal.core.util.concurrent.LifecycleDisposable
 import org.signal.core.util.logging.Log
 import org.thoughtcrime.securesms.DeviceActivity
 import org.thoughtcrime.securesms.R
+import org.thoughtcrime.securesms.components.settings.app.AppSettingsActivity
 import org.thoughtcrime.securesms.mediasend.CameraFragment
 import org.thoughtcrime.securesms.mediasend.Media
 import org.thoughtcrime.securesms.mediasend.v2.HudCommand
@@ -23,6 +24,7 @@ import org.thoughtcrime.securesms.mms.MediaConstraints
 import org.thoughtcrime.securesms.permissions.Permissions
 import org.thoughtcrime.securesms.stories.Stories
 import org.thoughtcrime.securesms.util.CommunicationActions
+import org.thoughtcrime.securesms.util.FeatureFlags
 import org.thoughtcrime.securesms.util.navigation.safeNavigate
 import java.io.FileDescriptor
 import java.util.Optional
@@ -92,7 +94,11 @@ class MediaCaptureFragment : Fragment(R.layout.fragment_container), CameraFragme
             .setTitle(R.string.MediaCaptureFragment_device_link_dialog_title)
             .setMessage(R.string.MediaCaptureFragment_device_link_dialog_body)
             .setPositiveButton(R.string.MediaCaptureFragment_device_link_dialog_continue) { d, _ ->
-              startActivity(DeviceActivity.getIntentForScanner(requireContext()))
+              if (FeatureFlags.linkedDevicesV2()) {
+                startActivity(AppSettingsActivity.linkedDevices(requireContext()))
+              } else {
+                startActivity(DeviceActivity.getIntentForScanner(requireContext()))
+              }
               requireActivity().finish()
             }
             .setNegativeButton(android.R.string.cancel, null)

app/src/main/res/navigation/app_settings.xml

@@ -591,7 +591,7 @@
 
     <action
         android:id="@+id/action_direct_to_devices"
-        app:destination="@id/deviceActivity"
+        app:destination="@id/linkDeviceFragment"
         app:enterAnim="@anim/fragment_open_enter"
         app:exitAnim="@anim/fragment_open_exit"
         app:popEnterAnim="@anim/fragment_close_enter"

app/src/main/res/navigation/app_settings_with_change_number_v2.xml

@@ -591,7 +591,7 @@
 
     <action
         android:id="@+id/action_direct_to_devices"
-        app:destination="@id/deviceActivity"
+        app:destination="@id/linkDeviceFragment"
         app:enterAnim="@anim/fragment_open_enter"
         app:exitAnim="@anim/fragment_open_exit"
         app:popEnterAnim="@anim/fragment_close_enter"