feat(ui): toggle archive granularity based on folder selection

Author: rafaeltonholo

legacy/ui/legacy/src/main/java/com/fsck/k9/ui/settings/account/AccountSettingsFragment.kt

@@ -303,6 +303,16 @@ class AccountSettingsFragment : PreferenceFragmentCompat(), ConfirmationDialogFr
         }
     }
 
+    private fun initializeArchiveFolderPreference() {
+        findPreference<Preference>(PREFERENCE_ARCHIVE_FOLDER)?.apply {
+            setOnPreferenceChangeListener { pref, newValue ->
+                val granularity = findPreference<Preference>(PREFERENCE_ARCHIVE_GRANULARITY)
+                granularity?.isEnabled = (pref as? FolderListPreference)?.isNoneSelected(newValue?.toString()) == false
+                true
+            }
+        }
+    }
+
     private fun maybeUpdateNotificationPreferences(account: LegacyAccountDto) {
         if (notificationSoundPreference != null ||
             notificationLightPreference != null ||
@@ -422,10 +432,13 @@ class AccountSettingsFragment : PreferenceFragmentCompat(), ConfirmationDialogFr
 
             if (!messagingController.isMoveCapable(account)) {
                 findPreference<Preference>(PREFERENCE_ARCHIVE_FOLDER).remove()
+                findPreference<Preference>(PREFERENCE_ARCHIVE_GRANULARITY).remove()
                 findPreference<Preference>(PREFERENCE_DRAFTS_FOLDER).remove()
                 findPreference<Preference>(PREFERENCE_SENT_FOLDER).remove()
                 findPreference<Preference>(PREFERENCE_SPAM_FOLDER).remove()
                 findPreference<Preference>(PREFERENCE_TRASH_FOLDER).remove()
+            } else {
+                initializeArchiveFolderPreference()
             }
 
             loadFolders(account)
@@ -455,6 +468,15 @@ class AccountSettingsFragment : PreferenceFragmentCompat(), ConfirmationDialogFr
 
         val automaticFolder = remoteFolderInfo.automaticSpecialFolders[type]
         folderListPreference.setFolders(remoteFolderInfo.folders, automaticFolder)
+        when (type) {
+            FolderType.ARCHIVE if folderListPreference.selected == null ->
+                findPreference<Preference>(PREFERENCE_ARCHIVE_GRANULARITY)?.isEnabled = false
+
+            FolderType.ARCHIVE ->
+                findPreference<Preference>(PREFERENCE_ARCHIVE_GRANULARITY)?.isEnabled = true
+
+            else -> Unit
+        }
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
@@ -529,6 +551,7 @@ class AccountSettingsFragment : PreferenceFragmentCompat(), ConfirmationDialogFr
         private const val PREFERENCE_AUTO_SELECT_FOLDER = "auto_select_folder"
         private const val PREFERENCE_SUBSCRIBED_FOLDERS_ONLY = "subscribed_folders_only"
         private const val PREFERENCE_ARCHIVE_FOLDER = "archive_folder"
+        private const val PREFERENCE_ARCHIVE_GRANULARITY = "archive_granularity"
         private const val PREFERENCE_DRAFTS_FOLDER = "drafts_folder"
         private const val PREFERENCE_SENT_FOLDER = "sent_folder"
         private const val PREFERENCE_SPAM_FOLDER = "spam_folder"

legacy/ui/legacy/src/main/java/com/fsck/k9/ui/settings/account/FolderListPreference.kt

@@ -34,6 +34,9 @@ constructor(
     private val folderNameFormatter: FolderNameFormatter by inject { parametersOf(context) }
     private val noFolderSelectedName = context.getString(R.string.account_settings_no_folder_selected).italicize()
     private lateinit var automaticFolderOption: CharSequence
+    val selected: Long?
+        get() = getSelectedValueAsString()
+            ?.toLongOrNull()
 
     init {
         entries = emptyArray()
@@ -79,6 +82,8 @@ constructor(
         }
     }
 
+    fun isNoneSelected(value: String? = this.value): Boolean = getSelectedValueAsString(value).isNullOrBlank()
+
     private fun getFolderDisplayNames(folders: List<RemoteFolder>) = folders.map { folderNameFormatter.displayName(it) }
 
     private fun getFolderValues(folders: List<RemoteFolder>) = folders.map { MANUAL_PREFIX + it.id.toString() }
@@ -87,6 +92,10 @@ constructor(
         return SpannableString(this).apply { setSpan(StyleSpan(Typeface.ITALIC), 0, this.length, 0) }
     }
 
+    private fun getSelectedValueAsString(value: String? = this.value): String? = value
+        ?.substringAfter(MANUAL_PREFIX)
+        ?.substringBefore(AUTOMATIC_PREFIX)
+
     companion object {
         const val FOLDER_VALUE_DELIMITER = "|"
         const val AUTOMATIC_PREFIX = "AUTOMATIC|"