mod: overhaul reader menu with long-press actions and quick toggles

Consolidate dictionary items: remove "Lookup Word History" and
"Delete Dictionary Cache" from the menu. Long-press on "Lookup Word"
opens history; delete-dict-cache is now a sentinel entry at the bottom
of the history list.

Replace "Reading Orientation" with "Toggle Portrait/Landscape" that
toggles between two configurable preferred orientations (new settings:
Preferred Portrait, Preferred Landscape). Long-press opens a manual
4-option orientation sub-menu.

Add "Toggle Font Size" menu item that cycles through font sizes and
applies on menu exit (with section re-layout).

Rename "Letterbox Fill" to "Override Letterbox Fill" and
"Sync Progress" to "Sync Reading Progress" in reader menu.

All long-press flows use ignoreNextConfirmRelease to prevent the
button release from triggering actions on the subsequent screen.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/I18n/I18nKeys.h

@@ -365,6 +365,11 @@ enum class StrId : uint16_t {
   STR_DICT_CACHE_DELETED,
   STR_NO_CACHE_TO_DELETE,
   STR_TABLE_OF_CONTENTS,
+  STR_TOGGLE_ORIENTATION,
+  STR_TOGGLE_FONT_SIZE,
+  STR_OVERRIDE_LETTERBOX_FILL,
+  STR_PREFERRED_PORTRAIT,
+  STR_PREFERRED_LANDSCAPE,
   // Sentinel - must be last
   _COUNT
 };

lib/I18n/translations/english.yaml

@@ -281,7 +281,7 @@ STR_HW_LEFT_LABEL: "Left (3rd button)"
 STR_HW_RIGHT_LABEL: "Right (4th button)"
 STR_GO_TO_PERCENT: "Go to %"
 STR_GO_HOME_BUTTON: "Go Home"
-STR_SYNC_PROGRESS: "Sync Progress"
+STR_SYNC_PROGRESS: "Sync Reading Progress"
 STR_DELETE_CACHE: "Delete Book Cache"
 STR_CHAPTER_PREFIX: "Chapter: "
 STR_PAGES_SEPARATOR: " pages  |  "
@@ -331,3 +331,8 @@ STR_BOOKMARK_REMOVED: "Bookmark removed"
 STR_DICT_CACHE_DELETED: "Dictionary cache deleted"
 STR_NO_CACHE_TO_DELETE: "No cache to delete"
 STR_TABLE_OF_CONTENTS: "Table of Contents"
+STR_TOGGLE_ORIENTATION: "Toggle Portrait/Landscape"
+STR_TOGGLE_FONT_SIZE: "Toggle Font Size"
+STR_OVERRIDE_LETTERBOX_FILL: "Override Letterbox Fill"
+STR_PREFERRED_PORTRAIT: "Preferred Portrait"
+STR_PREFERRED_LANDSCAPE: "Preferred Landscape"

src/CrossPointSettings.cpp

@@ -135,7 +135,9 @@ uint8_t CrossPointSettings::writeSettings(FsFile& file, bool count_only) const {
   writer.writeItem(file, fadingFix);
   writer.writeItem(file, embeddedStyle);
   writer.writeItem(file, sleepScreenLetterboxFill);
-  // New fields need to be added at end for backward compatibility
+  // New fields added at end for backward compatibility
+  writer.writeItem(file, preferredPortrait);
+  writer.writeItem(file, preferredLandscape);
 
   return writer.item_count;
 }
@@ -267,6 +269,10 @@ bool CrossPointSettings::loadFromFile() {
     { uint8_t _ignore; serialization::readPod(inputFile, _ignore); }  // legacy: sleepScreenGradientDir
     if (++settingsRead >= fileSettingsCount) break;
     // New fields added at end for backward compatibility
+    readAndValidate(inputFile, preferredPortrait, ORIENTATION_COUNT);
+    if (++settingsRead >= fileSettingsCount) break;
+    readAndValidate(inputFile, preferredLandscape, ORIENTATION_COUNT);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   if (frontButtonMappingRead) {

src/CrossPointSettings.h

@@ -183,6 +183,12 @@ class CrossPointSettings {
   // Use book's embedded CSS styles for EPUB rendering (1 = enabled, 0 = disabled)
   uint8_t embeddedStyle = 1;
 
+  // Preferred orientations for the portrait/landscape toggle in the reader menu.
+  // preferredPortrait: PORTRAIT (0) or INVERTED (2)
+  // preferredLandscape: LANDSCAPE_CW (1) or LANDSCAPE_CCW (3)
+  uint8_t preferredPortrait = PORTRAIT;
+  uint8_t preferredLandscape = LANDSCAPE_CW;
+
   ~CrossPointSettings() = default;
 
   // Get singleton instance

src/SettingsList.h

@@ -110,6 +110,23 @@ inline std::vector<SettingInfo> getSettingsList() {
       SettingInfo::Enum(StrId::STR_ORIENTATION, &CrossPointSettings::orientation,
                         {StrId::STR_PORTRAIT, StrId::STR_LANDSCAPE_CW, StrId::STR_INVERTED, StrId::STR_LANDSCAPE_CCW},
                         "orientation", StrId::STR_CAT_READER),
+      SettingInfo::DynamicEnum(
+          StrId::STR_PREFERRED_PORTRAIT, {StrId::STR_PORTRAIT, StrId::STR_INVERTED},
+          [] { return static_cast<uint8_t>(SETTINGS.preferredPortrait == CrossPointSettings::INVERTED ? 1 : 0); },
+          [](uint8_t idx) {
+            SETTINGS.preferredPortrait = (idx == 1) ? CrossPointSettings::INVERTED : CrossPointSettings::PORTRAIT;
+          },
+          "preferredPortrait", StrId::STR_CAT_READER),
+      SettingInfo::DynamicEnum(
+          StrId::STR_PREFERRED_LANDSCAPE, {StrId::STR_LANDSCAPE_CW, StrId::STR_LANDSCAPE_CCW},
+          [] {
+            return static_cast<uint8_t>(SETTINGS.preferredLandscape == CrossPointSettings::LANDSCAPE_CCW ? 1 : 0);
+          },
+          [](uint8_t idx) {
+            SETTINGS.preferredLandscape =
+                (idx == 1) ? CrossPointSettings::LANDSCAPE_CCW : CrossPointSettings::LANDSCAPE_CW;
+          },
+          "preferredLandscape", StrId::STR_CAT_READER),
       SettingInfo::Toggle(StrId::STR_EXTRA_SPACING, &CrossPointSettings::extraParagraphSpacing, "extraParagraphSpacing",
                           StrId::STR_CAT_READER),
       SettingInfo::Toggle(StrId::STR_TEXT_AA, &CrossPointSettings::textAntiAliasing, "textAntiAliasing",

src/activities/reader/EpubReaderActivity.cpp

@@ -250,8 +250,8 @@ void EpubReaderActivity::loop() {
     exitActivity();
     enterNewActivity(new EpubReaderMenuActivity(
         this->renderer, this->mappedInput, epub->getTitle(), currentPage, totalPages, bookProgressPercent,
-        SETTINGS.orientation, hasDictionary, isBookmarked, epub->getCachePath(),
+        SETTINGS.orientation, SETTINGS.fontSize, hasDictionary, isBookmarked, epub->getCachePath(),
-        [this](const uint8_t orientation) { onReaderMenuBack(orientation); },
+        [this](const uint8_t orientation, const uint8_t fontSize) { onReaderMenuBack(orientation, fontSize); },
         [this](EpubReaderMenuActivity::MenuAction action) { onReaderMenuConfirm(action); }));
   }
 
@@ -342,11 +342,13 @@ void EpubReaderActivity::loop() {
   }
 }
 
-void EpubReaderActivity::onReaderMenuBack(const uint8_t orientation) {
+void EpubReaderActivity::onReaderMenuBack(const uint8_t orientation, const uint8_t fontSize) {
   exitActivity();
   // Apply the user-selected orientation when the menu is dismissed.
   // This ensures the menu can be navigated without immediately rotating the screen.
   applyOrientation(orientation);
+  // Apply font size change (no-op if unchanged).
+  applyFontSize(fontSize);
   // Force a half refresh on the next render to clear menu/popup artifacts
   pagesUntilFullRefresh = 1;
   requestUpdate();
@@ -563,24 +565,6 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
           }));
       break;
     }
-    case EpubReaderMenuActivity::MenuAction::DELETE_DICT_CACHE: {
-      if (Dictionary::cacheExists()) {
-        Dictionary::deleteCache();
-        {
-          RenderLock lock(*this);
-          GUI.drawPopup(renderer, tr(STR_DICT_CACHE_DELETED));
-          renderer.displayBuffer(HalDisplay::FAST_REFRESH);
-        }
-      } else {
-        {
-          RenderLock lock(*this);
-          GUI.drawPopup(renderer, tr(STR_NO_CACHE_TO_DELETE));
-          renderer.displayBuffer(HalDisplay::FAST_REFRESH);
-        }
-      }
-      vTaskDelay(1500 / portTICK_PERIOD_MS);
-      break;
-    }
     case EpubReaderMenuActivity::MenuAction::SELECT_CHAPTER: {
       // Calculate values BEFORE we start destroying things
       const int currentP = section ? section->currentPage : 0;
@@ -706,7 +690,8 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
       exitActivity();
       enterNewActivity(new LookedUpWordsActivity(
           renderer, mappedInput, epub->getCachePath(), SETTINGS.getReaderFontId(), SETTINGS.orientation,
-          [this]() { pendingSubactivityExit = true; }, [this]() { pendingSubactivityExit = true; }));
+          [this]() { pendingSubactivityExit = true; }, [this]() { pendingSubactivityExit = true; },
+          true));  // initialSkipRelease: consumed the long-press that triggered this
       break;
     }
     case EpubReaderMenuActivity::MenuAction::GO_HOME: {
@@ -766,6 +751,7 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
     }
     // Handled locally in the menu activity (cycle on Confirm, never dispatched here)
     case EpubReaderMenuActivity::MenuAction::ROTATE_SCREEN:
+    case EpubReaderMenuActivity::MenuAction::TOGGLE_FONT_SIZE:
     case EpubReaderMenuActivity::MenuAction::LETTERBOX_FILL:
       break;
   }
@@ -798,6 +784,28 @@ void EpubReaderActivity::applyOrientation(const uint8_t orientation) {
   }
 }
 
+void EpubReaderActivity::applyFontSize(const uint8_t fontSize) {
+  if (SETTINGS.fontSize == fontSize) {
+    return;
+  }
+
+  // Preserve current reading position so we can restore after reflow.
+  {
+    RenderLock lock(*this);
+    if (section) {
+      cachedSpineIndex = currentSpineIndex;
+      cachedChapterTotalPageCount = section->pageCount;
+      nextPageNumber = section->currentPage;
+    }
+
+    SETTINGS.fontSize = fontSize;
+    SETTINGS.saveToFile();
+
+    // Reset section to force re-layout with the new font size.
+    section.reset();
+  }
+}
+
 // TODO: Failure handling
 void EpubReaderActivity::render(Activity::RenderLock&& lock) {
   if (!epub) {

src/activities/reader/EpubReaderActivity.h

@@ -33,9 +33,10 @@ class EpubReaderActivity final : public ActivityWithSubactivity {
   void saveProgress(int spineIndex, int currentPage, int pageCount);
   // Jump to a percentage of the book (0-100), mapping it to spine and page.
   void jumpToPercent(int percent);
-  void onReaderMenuBack(uint8_t orientation);
+  void onReaderMenuBack(uint8_t orientation, uint8_t fontSize);
   void onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction action);
   void applyOrientation(uint8_t orientation);
+  void applyFontSize(uint8_t fontSize);
 
  public:
   explicit EpubReaderActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, std::unique_ptr<Epub> epub,

src/activities/reader/EpubReaderMenuActivity.cpp

@@ -3,6 +3,7 @@
 #include <GfxRenderer.h>
 #include <I18n.h>
 
+#include "CrossPointSettings.h"
 #include "MappedInputManager.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
@@ -20,6 +21,55 @@ void EpubReaderMenuActivity::loop() {
     return;
   }
 
+  // --- Orientation sub-menu mode ---
+  if (orientationSelectMode) {
+    if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+      if (ignoreNextConfirmRelease) {
+        ignoreNextConfirmRelease = false;
+      } else {
+        pendingOrientation = static_cast<uint8_t>(orientationSelectIndex);
+        orientationSelectMode = false;
+        requestUpdate();
+      }
+      return;
+    }
+    if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+      orientationSelectMode = false;
+      ignoreNextConfirmRelease = false;
+      requestUpdate();
+      return;
+    }
+    buttonNavigator.onNext([this] {
+      orientationSelectIndex = ButtonNavigator::nextIndex(orientationSelectIndex,
+                                                          static_cast<int>(orientationLabels.size()));
+      requestUpdate();
+    });
+    buttonNavigator.onPrevious([this] {
+      orientationSelectIndex = ButtonNavigator::previousIndex(orientationSelectIndex,
+                                                              static_cast<int>(orientationLabels.size()));
+      requestUpdate();
+    });
+    return;
+  }
+
+  // --- Long-press detection (before release checks) ---
+  if (mappedInput.isPressed(MappedInputManager::Button::Confirm) && mappedInput.getHeldTime() >= LONG_PRESS_MS) {
+    const auto selectedAction = menuItems[selectedIndex].action;
+    if (selectedAction == MenuAction::LOOKUP) {
+      ignoreNextConfirmRelease = true;
+      auto cb = onAction;
+      cb(MenuAction::LOOKED_UP_WORDS);
+      return;
+    }
+    if (selectedAction == MenuAction::ROTATE_SCREEN) {
+      orientationSelectMode = true;
+      ignoreNextConfirmRelease = true;
+      orientationSelectIndex = pendingOrientation;
+      requestUpdate();
+      return;
+    }
+  }
+
   // Handle navigation
   buttonNavigator.onNext([this] {
     selectedIndex = ButtonNavigator::nextIndex(selectedIndex, static_cast<int>(menuItems.size()));
@@ -31,12 +81,29 @@ void EpubReaderMenuActivity::loop() {
     requestUpdate();
   });
 
-  // Use local variables for items we need to check after potential deletion
   if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    if (ignoreNextConfirmRelease) {
+      ignoreNextConfirmRelease = false;
+      return;
+    }
+
     const auto selectedAction = menuItems[selectedIndex].action;
     if (selectedAction == MenuAction::ROTATE_SCREEN) {
-      // Cycle orientation preview locally; actual rotation happens on menu exit.
+      // Toggle between the two preferred orientations.
-      pendingOrientation = (pendingOrientation + 1) % orientationLabels.size();
+      // If currently in a portrait-category orientation (Portrait/Inverted), switch to preferredLandscape.
+      // If currently in a landscape-category orientation (CW/CCW), switch to preferredPortrait.
+      const bool isCurrentlyPortrait = (pendingOrientation == CrossPointSettings::PORTRAIT ||
+                                        pendingOrientation == CrossPointSettings::INVERTED);
+      if (isCurrentlyPortrait) {
+        pendingOrientation = SETTINGS.preferredLandscape;
+      } else {
+        pendingOrientation = SETTINGS.preferredPortrait;
+      }
+      requestUpdate();
+      return;
+    }
+    if (selectedAction == MenuAction::TOGGLE_FONT_SIZE) {
+      pendingFontSize = (pendingFontSize + 1) % CrossPointSettings::FONT_SIZE_COUNT;
       requestUpdate();
       return;
     }
@@ -58,9 +125,9 @@ void EpubReaderMenuActivity::loop() {
     // 3. CRITICAL: Return immediately. 'this' is likely deleted now.
     return;
   } else if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
-    // Return the pending orientation to the parent so it can apply on exit.
+    // Return the pending orientation and font size to the parent so it can apply on exit.
-    onBack(pendingOrientation);
+    onBack(pendingOrientation, pendingFontSize);
-    return;  // Also return here just in case
+    return;
   }
 }
 
@@ -120,6 +187,11 @@ void EpubReaderMenuActivity::render(Activity::RenderLock&&) {
       const auto width = renderer.getTextWidth(UI_10_FONT_ID, value);
       renderer.drawText(UI_10_FONT_ID, contentX + contentWidth - 20 - width, displayY, value, !isSelected);
     }
+    if (menuItems[i].action == MenuAction::TOGGLE_FONT_SIZE) {
+      const char* value = I18N.get(fontSizeLabels[pendingFontSize]);
+      const auto width = renderer.getTextWidth(UI_10_FONT_ID, value);
+      renderer.drawText(UI_10_FONT_ID, contentX + contentWidth - 20 - width, displayY, value, !isSelected);
+    }
     if (menuItems[i].action == MenuAction::LETTERBOX_FILL) {
       // Render current letterbox fill value on the right edge of the content area.
       const char* value = I18N.get(letterboxFillLabels[letterboxFillToIndex()]);
@@ -128,6 +200,30 @@ void EpubReaderMenuActivity::render(Activity::RenderLock&&) {
     }
   }
 
+  // --- Orientation sub-menu overlay ---
+  if (orientationSelectMode) {
+    constexpr int popupMargin = 15;
+    constexpr int popupLineHeight = 28;
+    const int optionCount = static_cast<int>(orientationLabels.size());
+    const int popupH = popupMargin * 2 + popupLineHeight * optionCount;
+    const int popupW = contentWidth - 60;
+    const int popupX = contentX + (contentWidth - popupW) / 2;
+    const int popupY = 180 + hintGutterHeight;
+
+    renderer.fillRect(popupX - 2, popupY - 2, popupW + 4, popupH + 4, true);
+    renderer.fillRect(popupX, popupY, popupW, popupH, false);
+
+    for (int i = 0; i < optionCount; ++i) {
+      const int optY = popupY + popupMargin + i * popupLineHeight;
+      const bool isSel = (i == orientationSelectIndex);
+      if (isSel) {
+        renderer.fillRect(popupX + 2, optY, popupW - 4, popupLineHeight, true);
+      }
+      const char* label = I18N.get(orientationLabels[i]);
+      renderer.drawText(UI_10_FONT_ID, popupX + popupMargin, optY, label, !isSel);
+    }
+  }
+
   // Footer / Hints
   const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
   GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);

src/activities/reader/EpubReaderMenuActivity.h

@@ -7,6 +7,7 @@
 #include <vector>
 
 #include "../ActivityWithSubactivity.h"
+#include "CrossPointSettings.h"
 #include "util/BookSettings.h"
 #include "util/ButtonNavigator.h"
 
@@ -19,6 +20,7 @@ class EpubReaderMenuActivity final : public ActivityWithSubactivity {
     LOOKUP,
     LOOKED_UP_WORDS,
     ROTATE_SCREEN,
+    TOGGLE_FONT_SIZE,
     LETTERBOX_FILL,
     SELECT_CHAPTER,
     GO_TO_BOOKMARK,
@@ -26,19 +28,20 @@ class EpubReaderMenuActivity final : public ActivityWithSubactivity {
     GO_HOME,
     SYNC,
     DELETE_CACHE,
-    DELETE_DICT_CACHE
   };
 
   explicit EpubReaderMenuActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, const std::string& title,
                                   const int currentPage, const int totalPages, const int bookProgressPercent,
-                                  const uint8_t currentOrientation, const bool hasDictionary,
+                                  const uint8_t currentOrientation, const uint8_t currentFontSize,
-                                  const bool isBookmarked, const std::string& bookCachePath,
+                                  const bool hasDictionary, const bool isBookmarked,
-                                  const std::function<void(uint8_t)>& onBack,
+                                  const std::string& bookCachePath,
+                                  const std::function<void(uint8_t, uint8_t)>& onBack,
                                   const std::function<void(MenuAction)>& onAction)
       : ActivityWithSubactivity("EpubReaderMenu", renderer, mappedInput),
         menuItems(buildMenuItems(hasDictionary, isBookmarked)),
         title(title),
         pendingOrientation(currentOrientation),
+        pendingFontSize(currentFontSize),
         bookCachePath(bookCachePath),
         currentPage(currentPage),
         totalPages(totalPages),
@@ -68,8 +71,11 @@ class EpubReaderMenuActivity final : public ActivityWithSubactivity {
   ButtonNavigator buttonNavigator;
   std::string title = "Reader Menu";
   uint8_t pendingOrientation = 0;
+  uint8_t pendingFontSize = 0;
   const std::vector<StrId> orientationLabels = {StrId::STR_PORTRAIT, StrId::STR_LANDSCAPE_CW, StrId::STR_INVERTED,
                                                 StrId::STR_LANDSCAPE_CCW};
+  const std::vector<StrId> fontSizeLabels = {StrId::STR_SMALL, StrId::STR_MEDIUM, StrId::STR_LARGE,
+                                             StrId::STR_X_LARGE};
   std::string bookCachePath;
   // Letterbox fill override: 0xFF = Default (use global), 0 = Dithered, 1 = Solid, 2 = None
   uint8_t pendingLetterboxFill = BookSettings::USE_GLOBAL;
@@ -80,7 +86,15 @@ class EpubReaderMenuActivity final : public ActivityWithSubactivity {
   int totalPages = 0;
   int bookProgressPercent = 0;
 
-  const std::function<void(uint8_t)> onBack;
+  // Long-press state
+  bool ignoreNextConfirmRelease = false;
+  static constexpr unsigned long LONG_PRESS_MS = 700;
+
+  // Orientation sub-menu state (entered via long-press on Toggle Portrait/Landscape)
+  bool orientationSelectMode = false;
+  int orientationSelectIndex = 0;
+
+  const std::function<void(uint8_t, uint8_t)> onBack;
   const std::function<void(MenuAction)> onAction;
 
   // Map the internal override value to an index into letterboxFillLabels.
@@ -111,19 +125,16 @@ class EpubReaderMenuActivity final : public ActivityWithSubactivity {
     }
     if (hasDictionary) {
       items.push_back({MenuAction::LOOKUP, StrId::STR_LOOKUP_WORD});
-      items.push_back({MenuAction::LOOKED_UP_WORDS, StrId::STR_LOOKUP_HISTORY});
     }
-    items.push_back({MenuAction::ROTATE_SCREEN, StrId::STR_ORIENTATION});
+    items.push_back({MenuAction::ROTATE_SCREEN, StrId::STR_TOGGLE_ORIENTATION});
-    items.push_back({MenuAction::LETTERBOX_FILL, StrId::STR_LETTERBOX_FILL});
+    items.push_back({MenuAction::TOGGLE_FONT_SIZE, StrId::STR_TOGGLE_FONT_SIZE});
+    items.push_back({MenuAction::LETTERBOX_FILL, StrId::STR_OVERRIDE_LETTERBOX_FILL});
     items.push_back({MenuAction::SELECT_CHAPTER, StrId::STR_TABLE_OF_CONTENTS});
     items.push_back({MenuAction::GO_TO_BOOKMARK, StrId::STR_GO_TO_BOOKMARK});
     items.push_back({MenuAction::GO_TO_PERCENT, StrId::STR_GO_TO_PERCENT});
     items.push_back({MenuAction::GO_HOME, StrId::STR_CLOSE_BOOK});
     items.push_back({MenuAction::SYNC, StrId::STR_SYNC_PROGRESS});
     items.push_back({MenuAction::DELETE_CACHE, StrId::STR_DELETE_CACHE});
-    if (hasDictionary) {
-      items.push_back({MenuAction::DELETE_DICT_CACHE, StrId::STR_DELETE_DICT_CACHE});
-    }
     return items;
   }
 

src/activities/reader/LookedUpWordsActivity.cpp

@@ -1,6 +1,7 @@
 #include "LookedUpWordsActivity.h"
 
 #include <GfxRenderer.h>
+#include <I18n.h>
 
 #include <algorithm>
 
@@ -16,6 +17,9 @@ void LookedUpWordsActivity::onEnter() {
   ActivityWithSubactivity::onEnter();
   words = LookupHistory::load(cachePath);
   std::reverse(words.begin(), words.end());
+  // Append the "Delete Dictionary Cache" sentinel entry
+  words.push_back("\xE2\x80\x94 " + std::string(tr(STR_DELETE_DICT_CACHE)));
+  deleteDictCacheIndex = static_cast<int>(words.size()) - 1;
   requestUpdate();
 }
 
@@ -39,6 +43,7 @@ void LookedUpWordsActivity::loop() {
     return;
   }
 
+  // Empty list has only the sentinel entry; if even that's gone, just go back.
   if (words.empty()) {
     if (mappedInput.wasReleased(MappedInputManager::Button::Back) ||
         mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
@@ -57,6 +62,10 @@ void LookedUpWordsActivity::loop() {
         // Confirm delete
         LookupHistory::removeWord(cachePath, words[pendingDeleteIndex]);
         words.erase(words.begin() + pendingDeleteIndex);
+        // Adjust sentinel index since we removed an item before it
+        if (deleteDictCacheIndex > pendingDeleteIndex) {
+          deleteDictCacheIndex--;
+        }
         if (selectedIndex >= static_cast<int>(words.size())) {
           selectedIndex = std::max(0, static_cast<int>(words.size()) - 1);
         }
@@ -72,9 +81,10 @@ void LookedUpWordsActivity::loop() {
     return;
   }
 
-  // Detect long press on Confirm to trigger delete
+  // Detect long press on Confirm to trigger delete (only for real word entries, not sentinel)
   constexpr unsigned long DELETE_HOLD_MS = 700;
-  if (mappedInput.isPressed(MappedInputManager::Button::Confirm) && mappedInput.getHeldTime() >= DELETE_HOLD_MS) {
+  if (selectedIndex != deleteDictCacheIndex &&
+      mappedInput.isPressed(MappedInputManager::Button::Confirm) && mappedInput.getHeldTime() >= DELETE_HOLD_MS) {
     deleteConfirmMode = true;
     ignoreNextConfirmRelease = true;
     pendingDeleteIndex = selectedIndex;
@@ -106,6 +116,33 @@ void LookedUpWordsActivity::loop() {
   });
 
   if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    // Consume stale release from long-press navigation into this activity
+    if (ignoreNextConfirmRelease) {
+      ignoreNextConfirmRelease = false;
+      return;
+    }
+
+    // Handle the "Delete Dictionary Cache" sentinel entry
+    if (selectedIndex == deleteDictCacheIndex) {
+      if (Dictionary::cacheExists()) {
+        Dictionary::deleteCache();
+        {
+          Activity::RenderLock lock(*this);
+          GUI.drawPopup(renderer, tr(STR_DICT_CACHE_DELETED));
+          renderer.displayBuffer(HalDisplay::FAST_REFRESH);
+        }
+      } else {
+        {
+          Activity::RenderLock lock(*this);
+          GUI.drawPopup(renderer, tr(STR_NO_CACHE_TO_DELETE));
+          renderer.displayBuffer(HalDisplay::FAST_REFRESH);
+        }
+      }
+      vTaskDelay(1500 / portTICK_PERIOD_MS);
+      requestUpdate();
+      return;
+    }
+
     const std::string& headword = words[selectedIndex];
 
     Rect popupLayout;
@@ -197,6 +234,9 @@ void LookedUpWordsActivity::render(Activity::RenderLock&&) {
   const int contentTop = hintGutterHeight + metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing;
   const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing;
 
+  // The list always has at least the sentinel entry
+  const bool hasRealWords = (deleteDictCacheIndex > 0);
+
   if (words.empty()) {
     renderer.drawCenteredText(UI_10_FONT_ID, contentTop + 20, "No words looked up yet");
   } else {
@@ -234,8 +274,8 @@ void LookedUpWordsActivity::render(Activity::RenderLock&&) {
     const auto labels = mappedInput.mapLabels("Cancel", "Delete", "", "");
     GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
   } else {
-    // "Hold select to delete" hint above button hints
+    // "Hold select to delete" hint above button hints (only when real words exist)
-    if (!words.empty()) {
+    if (hasRealWords) {
       const char* deleteHint = "Hold select to delete";
       const int hintWidth = renderer.getTextWidth(SMALL_FONT_ID, deleteHint);
       const int hintX = contentX + (renderer.getScreenWidth() - hintGutterWidth - hintWidth) / 2;

src/activities/reader/LookedUpWordsActivity.h

@@ -10,13 +10,14 @@ class LookedUpWordsActivity final : public ActivityWithSubactivity {
  public:
   explicit LookedUpWordsActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, const std::string& cachePath,
                                  int readerFontId, uint8_t orientation, const std::function<void()>& onBack,
-                                 const std::function<void()>& onDone)
+                                 const std::function<void()>& onDone, bool initialSkipRelease = false)
       : ActivityWithSubactivity("LookedUpWords", renderer, mappedInput),
         cachePath(cachePath),
         readerFontId(readerFontId),
         orientation(orientation),
         onBack(onBack),
-        onDone(onDone) {}
+        onDone(onDone),
+        ignoreNextConfirmRelease(initialSkipRelease) {}
 
   void onEnter() override;
   void onExit() override;
@@ -41,5 +42,9 @@ class LookedUpWordsActivity final : public ActivityWithSubactivity {
   bool ignoreNextConfirmRelease = false;
   int pendingDeleteIndex = 0;
 
+  // Sentinel index: the "Delete Dictionary Cache" entry at the end of the list.
+  // -1 if not present (shouldn't happen when dictionary exists).
+  int deleteDictCacheIndex = -1;
+
   int getPageItems() const;
 };