Add 'Previous card info' menu action in new reviewer

Author: lukstbit

AnkiDroid/src/main/java/com/ichi2/anki/preferences/reviewer/ViewerAction.kt

@@ -69,6 +69,7 @@ enum class ViewerAction(
     STATISTICS(R.id.action_statistics, R.drawable.ic_bar_chart_black, R.string.empty_string, DISABLED),
     DECK_OPTIONS(R.id.action_deck_options, R.drawable.ic_tune_white, R.string.menu__deck_options, DISABLED),
     CARD_INFO(R.id.action_card_info, R.drawable.ic_dialog_info, R.string.card_info_title, DISABLED),
+    PREVIOUS_CARD_INFO(R.id.action_previous_card_info, R.drawable.ic_outline_info_24, R.string.empty_string, DISABLED),
     ADD_NOTE(R.id.action_add_note, R.drawable.ic_add, R.string.menu_add_note, DISABLED),
     TAG(R.id.action_edit_tags, R.drawable.ic_tag, R.string.menu_edit_tags, DISABLED),
     RESCHEDULE_NOTE(R.id.action_set_due_date, R.drawable.ic_reschedule, titleRes = R.string.empty_string, DISABLED),
@@ -144,6 +145,7 @@ enum class ViewerAction(
             BROWSE -> listOf(keycode(KeyEvent.KEYCODE_B))
             STATISTICS -> listOf(keycode(KeyEvent.KEYCODE_T))
             PLAY_MEDIA -> listOf(keycode(KeyEvent.KEYCODE_R))
+            PREVIOUS_CARD_INFO -> listOf(keycode(KeyEvent.KEYCODE_I, ModifierKeys(shift = false, ctrl = true, alt = true)))
             TOGGLE_FLAG_RED ->
                 listOf(
                     keycode(KeyEvent.KEYCODE_1, ctrl()),
@@ -248,6 +250,7 @@ enum class ViewerAction(
             BROWSE -> TR.qtMiscBrowse()
             STATISTICS -> TR.statisticsTitle()
             RESCHEDULE_NOTE -> TR.actionsSetDueDate().toSentenceCase(context, R.string.sentence_set_due_date)
+            PREVIOUS_CARD_INFO -> TR.actionsPreviousCardInfo().toSentenceCase(context, R.string.sentence_actions_previous_card_info)
             else -> context.getString(titleRes)
         }
 

AnkiDroid/src/main/java/com/ichi2/anki/ui/windows/reviewer/ReviewerViewModel.kt

@@ -15,6 +15,7 @@
  */
 package com.ichi2.anki.ui.windows.reviewer
 
+import androidx.lifecycle.SavedStateHandle
 import anki.collection.OpChanges
 import anki.collection.OpChangesAfterUndo
 import anki.frontend.SetSchedulingStatesRequest
@@ -63,6 +64,7 @@ import com.ichi2.anki.ui.windows.reviewer.autoadvance.AutoAdvance
 import com.ichi2.anki.utils.CollectionPreferences
 import com.ichi2.anki.utils.Destination
 import com.ichi2.anki.utils.ext.answerCard
+import com.ichi2.anki.utils.ext.cardStatsNoCardClean
 import com.ichi2.anki.utils.ext.flag
 import com.ichi2.anki.utils.ext.getLongOrNull
 import com.ichi2.anki.utils.ext.setUserFlagForCards
@@ -74,8 +76,9 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import org.intellij.lang.annotations.Language
 import timber.log.Timber
 
-class ReviewerViewModel :
-    CardViewerViewModel(),
+class ReviewerViewModel(
+    val savedStateHandle: SavedStateHandle,
+) : CardViewerViewModel(),
     ChangeManager.Subscriber,
     BindingProcessor<ReviewerBinding, ViewerAction> {
     private var queueState: Deferred<CurrentQueueState?> =
@@ -251,6 +254,18 @@ class ReviewerViewModel :
         destinationFlow.emit(destination)
     }
 
+    private suspend fun emitPreviousCardInfoDestination() {
+        val previousCardId: CardId? = savedStateHandle.getLongOrNull(KEY_PREVIOUS_CARD_ID)
+        if (previousCardId == null) {
+            Timber.i("No previous answered card found, ignoring request for 'previous card info'")
+            actionFeedbackFlow.emit(TR.cardStatsNoCardClean())
+            return
+        }
+        val destination = CardInfoDestination(previousCardId, TR.cardStatsPreviousCard(TR.decksStudy()))
+        Timber.i("Launching 'previous card info' for card %d", previousCardId)
+        destinationFlow.emit(destination)
+    }
+
     private suspend fun emitDeckOptionsDestination() {
         val deckId = withCol { decks.getCurrentId() }
         val isFiltered = withCol { decks.isFiltered(deckId) }
@@ -464,6 +479,7 @@ class ReviewerViewModel :
 
             undoableOp(handler = this) { sched.answerCard(answer) }
             answerFeedbackFlow.emit(rating)
+            savedStateHandle[KEY_PREVIOUS_CARD_ID] = card.id
 
             val wasLeech = withCol { sched.stateIsLeech(answer.newState) }
             if (wasLeech) {
@@ -640,6 +656,7 @@ class ReviewerViewModel :
             when (action) {
                 ViewerAction.ADD_NOTE -> emitAddNoteDestination()
                 ViewerAction.CARD_INFO -> emitCardInfoDestination()
+                ViewerAction.PREVIOUS_CARD_INFO -> emitPreviousCardInfoDestination()
                 ViewerAction.DECK_OPTIONS -> emitDeckOptionsDestination()
                 ViewerAction.EDIT -> emitEditNoteDestination()
                 ViewerAction.TAG -> editNoteTags()
@@ -740,4 +757,8 @@ class ReviewerViewModel :
             }
         }
     }
+
+    companion object {
+        private const val KEY_PREVIOUS_CARD_ID = "key_previous_card_id"
+    }
 }

AnkiDroid/src/main/java/com/ichi2/anki/utils/ext/Translations.kt

@@ -0,0 +1,29 @@
+/****************************************************************************************
+ * Copyright (c) 2025 lukstbit <[email protected]>             *
+ *                                                                                      *
+ * This program is free software; you can redistribute it and/or modify it under        *
+ * the terms of the GNU General Public License as published by the Free Software        *
+ * Foundation; either version 3 of the License, or (at your option) any later           *
+ * version.                                                                             *
+ *                                                                                      *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY      *
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A      *
+ * PARTICULAR PURPOSE. See the GNU General Public License for more details.             *
+ *                                                                                      *
+ * You should have received a copy of the GNU General Public License along with         *
+ * this program.  If not, see <http://www.gnu.org/licenses/>.                           *
+ ****************************************************************************************/
+package com.ichi2.anki.utils.ext
+
+import net.ankiweb.rsdroid.Translations
+
+/**
+ * Same as [Translations.cardStatsNoCard] but removes unwanted characters like parentheses and dots
+ * from the returned string:
+ *
+ *  Original string: "(No card to display.)" -> Returned: "No card to display"
+ */
+fun Translations.cardStatsNoCardClean(): String {
+    // regex removes any parentheses or dots from the string
+    return cardStatsNoCard().replace("[().]".toRegex(), "")
+}

AnkiDroid/src/main/res/values/ids.xml

@@ -34,6 +34,7 @@
     <item type="id" name="action_edit_note"/>
     <item type="id" name="action_edit_tags"/>
     <item type="id" name="action_card_info"/>
+    <item type="id" name="action_previous_card_info"/>
     <item type="id" name="action_bury_card"/>
     <item type="id" name="action_bury_note"/>
     <item type="id" name="action_suspend_card"/>