Fix exiting WifiSelectionActivity renderer early

## Summary

* Fix underscore on keyboard
  * Remove special handling of special row characters
* Fix navigating between special row items
* Standardize keyboard activity to use standard loop
  * Fix issue with rendering keyboard non-stop

Fixes https://github.com/daveallie/crosspoint-reader/issues/131

lib/Epub/Epub/ParsedText.cpp

@@ -106,6 +106,18 @@ std::vector<size_t> ParsedText::computeLineBreaks(const int pageWidth, const int
         ans[i] = j;  // j is the index of the last word in this optimal line
       }
     }
+
+    // Handle oversized word: if no valid configuration found, force single-word line
+    // This prevents cascade failure where one oversized word breaks all preceding words
+    if (dp[i] == MAX_COST) {
+      ans[i] = i;  // Just this word on its own line
+      // Inherit cost from next word to allow subsequent words to find valid configurations
+      if (i + 1 < static_cast<int>(totalWordCount)) {
+        dp[i] = dp[i + 1];
+      } else {
+        dp[i] = 0;
+      }
+    }
   }
 
   // Stores the index of the word that starts the next line (last_word_index + 1)

lib/Epub/Epub/Section.cpp

@@ -115,26 +115,56 @@ bool Section::clearCache() const {
 
 bool Section::persistPageDataToSD(const int fontId, const float lineCompression, const int marginTop,
                                   const int marginRight, const int marginBottom, const int marginLeft,
-                                  const bool extraParagraphSpacing) {
+                                  const bool extraParagraphSpacing, const std::function<void()>& progressSetupFn,
+                                  const std::function<void(int)>& progressFn) {
+  constexpr size_t MIN_SIZE_FOR_PROGRESS = 50 * 1024;  // 50KB
   const auto localPath = epub->getSpineItem(spineIndex).href;
   const auto tmpHtmlPath = epub->getCachePath() + "/.tmp_" + std::to_string(spineIndex) + ".html";
-  File tmpHtml;
-  if (!FsHelpers::openFileForWrite("SCT", tmpHtmlPath, tmpHtml)) {
-    return false;
+
+  // Retry logic for SD card timing issues
+  bool success = false;
+  size_t fileSize = 0;
+  for (int attempt = 0; attempt < 3 && !success; attempt++) {
+    if (attempt > 0) {
+      Serial.printf("[%lu] [SCT] Retrying stream (attempt %d)...\n", millis(), attempt + 1);
+      delay(50);  // Brief delay before retry
+    }
+
+    // Remove any incomplete file from previous attempt before retrying
+    if (SD.exists(tmpHtmlPath.c_str())) {
+      SD.remove(tmpHtmlPath.c_str());
+    }
+
+    File tmpHtml;
+    if (!FsHelpers::openFileForWrite("SCT", tmpHtmlPath, tmpHtml)) {
+      continue;
+    }
+    success = epub->readItemContentsToStream(localPath, tmpHtml, 1024);
+    fileSize = tmpHtml.size();
+    tmpHtml.close();
+
+    // If streaming failed, remove the incomplete file immediately
+    if (!success && SD.exists(tmpHtmlPath.c_str())) {
+      SD.remove(tmpHtmlPath.c_str());
+      Serial.printf("[%lu] [SCT] Removed incomplete temp file after failed attempt\n", millis());
+    }
   }
-  bool success = epub->readItemContentsToStream(localPath, tmpHtml, 1024);
-  tmpHtml.close();
 
   if (!success) {
-    Serial.printf("[%lu] [SCT] Failed to stream item contents to temp file\n", millis());
+    Serial.printf("[%lu] [SCT] Failed to stream item contents to temp file after retries\n", millis());
     return false;
   }
 
-  Serial.printf("[%lu] [SCT] Streamed temp HTML to %s\n", millis(), tmpHtmlPath.c_str());
+  Serial.printf("[%lu] [SCT] Streamed temp HTML to %s (%d bytes)\n", millis(), tmpHtmlPath.c_str(), fileSize);
 
-  ChapterHtmlSlimParser visitor(tmpHtmlPath, renderer, fontId, lineCompression, marginTop, marginRight, marginBottom,
-                                marginLeft, extraParagraphSpacing,
-                                [this](std::unique_ptr<Page> page) { this->onPageComplete(std::move(page)); });
+  // Only show progress bar for larger chapters where rendering overhead is worth it
+  if (progressSetupFn && fileSize >= MIN_SIZE_FOR_PROGRESS) {
+    progressSetupFn();
+  }
+
+  ChapterHtmlSlimParser visitor(
+      tmpHtmlPath, renderer, fontId, lineCompression, marginTop, marginRight, marginBottom, marginLeft,
+      extraParagraphSpacing, [this](std::unique_ptr<Page> page) { this->onPageComplete(std::move(page)); }, progressFn);
   success = visitor.parseAndBuildPages();
 
   SD.remove(tmpHtmlPath.c_str());

lib/Epub/Epub/Section.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <functional>
 #include <memory>
 
 #include "Epub.h"
@@ -31,6 +32,8 @@ class Section {
   void setupCacheDir() const;
   bool clearCache() const;
   bool persistPageDataToSD(int fontId, float lineCompression, int marginTop, int marginRight, int marginBottom,
-                           int marginLeft, bool extraParagraphSpacing);
+                           int marginLeft, bool extraParagraphSpacing,
+                           const std::function<void()>& progressSetupFn = nullptr,
+                           const std::function<void(int)>& progressFn = nullptr);
   std::unique_ptr<Page> loadPageFromSD() const;
 };

lib/Epub/Epub/blocks/TextBlock.cpp

@@ -4,11 +4,18 @@
 #include <Serialization.h>
 
 void TextBlock::render(const GfxRenderer& renderer, const int fontId, const int x, const int y) const {
+  // Validate iterator bounds before rendering
+  if (words.size() != wordXpos.size() || words.size() != wordStyles.size()) {
+    Serial.printf("[%lu] [TXB] Render skipped: size mismatch (words=%u, xpos=%u, styles=%u)\n", millis(),
+                  (uint32_t)words.size(), (uint32_t)wordXpos.size(), (uint32_t)wordStyles.size());
+    return;
+  }
+
   auto wordIt = words.begin();
   auto wordStylesIt = wordStyles.begin();
   auto wordXposIt = wordXpos.begin();
 
-  for (int i = 0; i < words.size(); i++) {
+  for (size_t i = 0; i < words.size(); i++) {
     renderer.drawText(fontId, *wordXposIt + x, y, wordIt->c_str(), true, *wordStylesIt);
 
     std::advance(wordIt, 1);
@@ -46,6 +53,13 @@ std::unique_ptr<TextBlock> TextBlock::deserialize(File& file) {
 
   // words
   serialization::readPod(file, wc);
+
+  // Sanity check: prevent allocation of unreasonably large lists (max 10000 words per block)
+  if (wc > 10000) {
+    Serial.printf("[%lu] [TXB] Deserialization failed: word count %u exceeds maximum\n", millis(), wc);
+    return nullptr;
+  }
+
   words.resize(wc);
   for (auto& w : words) serialization::readString(file, w);
 
@@ -59,6 +73,13 @@ std::unique_ptr<TextBlock> TextBlock::deserialize(File& file) {
   wordStyles.resize(sc);
   for (auto& s : wordStyles) serialization::readPod(file, s);
 
+  // Validate data consistency: all three lists must have the same size
+  if (wc != xc || wc != sc) {
+    Serial.printf("[%lu] [TXB] Deserialization failed: size mismatch (words=%u, xpos=%u, styles=%u)\n", millis(), wc,
+                  xc, sc);
+    return nullptr;
+  }
+
   // style
   serialization::readPod(file, style);
 

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp

@@ -11,6 +11,9 @@
 const char* HEADER_TAGS[] = {"h1", "h2", "h3", "h4", "h5", "h6"};
 constexpr int NUM_HEADER_TAGS = sizeof(HEADER_TAGS) / sizeof(HEADER_TAGS[0]);
 
+// Minimum file size (in bytes) to show progress bar - smaller chapters don't benefit from it
+constexpr size_t MIN_SIZE_FOR_PROGRESS = 50 * 1024;  // 50KB
+
 const char* BLOCK_TAGS[] = {"p", "li", "div", "br", "blockquote"};
 constexpr int NUM_BLOCK_TAGS = sizeof(BLOCK_TAGS) / sizeof(BLOCK_TAGS[0]);
 
@@ -221,6 +224,11 @@ bool ChapterHtmlSlimParser::parseAndBuildPages() {
     return false;
   }
 
+  // Get file size for progress calculation
+  const size_t totalSize = file.size();
+  size_t bytesRead = 0;
+  int lastProgress = -1;
+
   XML_SetUserData(parser, this);
   XML_SetElementHandler(parser, startElement, endElement);
   XML_SetCharacterDataHandler(parser, characterData);
@@ -249,6 +257,17 @@ bool ChapterHtmlSlimParser::parseAndBuildPages() {
       return false;
     }
 
+    // Update progress (call every 10% change to avoid too frequent updates)
+    // Only show progress for larger chapters where rendering overhead is worth it
+    bytesRead += len;
+    if (progressFn && totalSize >= MIN_SIZE_FOR_PROGRESS) {
+      const int progress = static_cast<int>((bytesRead * 100) / totalSize);
+      if (lastProgress / 10 != progress / 10) {
+        lastProgress = progress;
+        progressFn(progress);
+      }
+    }
+
     done = file.available() == 0;
 
     if (XML_ParseBuffer(parser, static_cast<int>(len), done) == XML_STATUS_ERROR) {

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.h

@@ -18,6 +18,7 @@ class ChapterHtmlSlimParser {
   const std::string& filepath;
   GfxRenderer& renderer;
   std::function<void(std::unique_ptr<Page>)> completePageFn;
+  std::function<void(int)> progressFn;  // Progress callback (0-100)
   int depth = 0;
   int skipUntilDepth = INT_MAX;
   int boldUntilDepth = INT_MAX;
@@ -48,7 +49,8 @@ class ChapterHtmlSlimParser {
   explicit ChapterHtmlSlimParser(const std::string& filepath, GfxRenderer& renderer, const int fontId,
                                  const float lineCompression, const int marginTop, const int marginRight,
                                  const int marginBottom, const int marginLeft, const bool extraParagraphSpacing,
-                                 const std::function<void(std::unique_ptr<Page>)>& completePageFn)
+                                 const std::function<void(std::unique_ptr<Page>)>& completePageFn,
+                                 const std::function<void(int)>& progressFn = nullptr)
       : filepath(filepath),
         renderer(renderer),
         fontId(fontId),
@@ -58,7 +60,8 @@ class ChapterHtmlSlimParser {
         marginBottom(marginBottom),
         marginLeft(marginLeft),
         extraParagraphSpacing(extraParagraphSpacing),
-        completePageFn(completePageFn) {}
+        completePageFn(completePageFn),
+        progressFn(progressFn) {}
   ~ChapterHtmlSlimParser() = default;
   bool parseAndBuildPages();
   void addLineToPage(std::shared_ptr<TextBlock> line);

src/activities/network/WifiSelectionActivity.cpp

@@ -187,11 +187,21 @@ void WifiSelectionActivity::selectNetwork(const int index) {
   if (selectedRequiresPassword) {
     // Show password entry
     state = WifiSelectionState::PASSWORD_ENTRY;
-    enterNewActivity(new KeyboardEntryActivity(renderer, inputManager, "Enter WiFi Password",
-                                               "",    // No initial text
-                                               64,    // Max password length
-                                               false  // Show password by default (hard keyboard to use)
-                                               ));
+    enterNewActivity(new KeyboardEntryActivity(
+        renderer, inputManager, "Enter WiFi Password",
+        "",     // No initial text
+        50,     // Y position
+        64,     // Max password length
+        false,  // Show password by default (hard keyboard to use)
+        [this](const std::string& text) {
+          enteredPassword = text;
+          exitActivity();
+        },
+        [this] {
+          state = WifiSelectionState::NETWORK_LIST;
+          updateRequired = true;
+          exitActivity();
+        }));
     updateRequired = true;
   } else {
     // Connect directly for open networks
@@ -208,11 +218,6 @@ void WifiSelectionActivity::attemptConnection() {
 
   WiFi.mode(WIFI_STA);
 
-  // Get password from keyboard if we just entered it
-  if (subActivity && !usedSavedPassword) {
-    enteredPassword = static_cast<KeyboardEntryActivity*>(subActivity.get())->getText();
-  }
-
   if (selectedRequiresPassword && !enteredPassword.empty()) {
     WiFi.begin(selectedSSID.c_str(), enteredPassword.c_str());
   } else {
@@ -269,6 +274,11 @@ void WifiSelectionActivity::checkConnectionStatus() {
 }
 
 void WifiSelectionActivity::loop() {
+  if (subActivity) {
+    subActivity->loop();
+    return;
+  }
+
   // Check scan progress
   if (state == WifiSelectionState::SCANNING) {
     processWifiScanResults();
@@ -281,24 +291,9 @@ void WifiSelectionActivity::loop() {
     return;
   }
 
-  // Handle password entry state
-  if (state == WifiSelectionState::PASSWORD_ENTRY && subActivity) {
-    const auto keyboard = static_cast<KeyboardEntryActivity*>(subActivity.get());
-    keyboard->handleInput();
-
-    if (keyboard->isComplete()) {
-      attemptConnection();
-      return;
-    }
-
-    if (keyboard->isCancelled()) {
-      state = WifiSelectionState::NETWORK_LIST;
-      exitActivity();
-      updateRequired = true;
-      return;
-    }
-
-    updateRequired = true;
+  if (state == WifiSelectionState::PASSWORD_ENTRY) {
+    // Reach here once password entry finished in subactivity
+    attemptConnection();
     return;
   }
 
@@ -441,6 +436,10 @@ std::string WifiSelectionActivity::getSignalStrengthIndicator(const int32_t rssi
 
 void WifiSelectionActivity::displayTaskLoop() {
   while (true) {
+    if (subActivity) {
+      continue;
+    }
+
     if (updateRequired) {
       updateRequired = false;
       xSemaphoreTake(renderingMutex, portMAX_DELAY);
@@ -461,9 +460,6 @@ void WifiSelectionActivity::render() const {
     case WifiSelectionState::NETWORK_LIST:
       renderNetworkList();
       break;
-    case WifiSelectionState::PASSWORD_ENTRY:
-      renderPasswordEntry();
-      break;
     case WifiSelectionState::CONNECTING:
       renderConnecting();
       break;
@@ -561,23 +557,6 @@ void WifiSelectionActivity::renderNetworkList() const {
   renderer.drawButtonHints(UI_FONT_ID, "« Back", "Connect", "", "");
 }
 
-void WifiSelectionActivity::renderPasswordEntry() const {
-  // Draw header
-  renderer.drawCenteredText(READER_FONT_ID, 5, "WiFi Password", true, BOLD);
-
-  // Draw network name with good spacing from header
-  std::string networkInfo = "Network: " + selectedSSID;
-  if (networkInfo.length() > 30) {
-    networkInfo.replace(27, networkInfo.length() - 27, "...");
-  }
-  renderer.drawCenteredText(UI_FONT_ID, 38, networkInfo.c_str(), true, REGULAR);
-
-  // Draw keyboard
-  if (subActivity) {
-    static_cast<KeyboardEntryActivity*>(subActivity.get())->render(58);
-  }
-}
-
 void WifiSelectionActivity::renderConnecting() const {
   const auto pageHeight = renderer.getScreenHeight();
   const auto height = renderer.getLineHeight(UI_FONT_ID);

src/activities/reader/EpubReaderActivity.cpp

@@ -227,23 +227,51 @@ void EpubReaderActivity::renderScreen() {
                                     SETTINGS.extraParagraphSpacing)) {
       Serial.printf("[%lu] [ERS] Cache not found, building...\n", millis());
 
+      // Progress bar dimensions
+      constexpr int barWidth = 200;
+      constexpr int barHeight = 10;
+      constexpr int boxMargin = 20;
+      const int textWidth = renderer.getTextWidth(READER_FONT_ID, "Indexing...");
+      const int boxWidthWithBar = (barWidth > textWidth ? barWidth : textWidth) + boxMargin * 2;
+      const int boxWidthNoBar = textWidth + boxMargin * 2;
+      const int boxHeightWithBar = renderer.getLineHeight(READER_FONT_ID) + barHeight + boxMargin * 3;
+      const int boxHeightNoBar = renderer.getLineHeight(READER_FONT_ID) + boxMargin * 2;
+      const int boxXWithBar = (GfxRenderer::getScreenWidth() - boxWidthWithBar) / 2;
+      const int boxXNoBar = (GfxRenderer::getScreenWidth() - boxWidthNoBar) / 2;
+      constexpr int boxY = 50;
+      const int barX = boxXWithBar + (boxWidthWithBar - barWidth) / 2;
+      const int barY = boxY + renderer.getLineHeight(READER_FONT_ID) + boxMargin * 2;
+
+      // Always show "Indexing..." text first
       {
-        const int textWidth = renderer.getTextWidth(READER_FONT_ID, "Indexing...");
-        constexpr int margin = 20;
-        const int x = (GfxRenderer::getScreenWidth() - textWidth - margin * 2) / 2;
-        constexpr int y = 50;
-        const int w = textWidth + margin * 2;
-        const int h = renderer.getLineHeight(READER_FONT_ID) + margin * 2;
-        renderer.fillRect(x, y, w, h, false);
-        renderer.drawText(READER_FONT_ID, x + margin, y + margin, "Indexing...");
-        renderer.drawRect(x + 5, y + 5, w - 10, h - 10);
+        renderer.fillRect(boxXNoBar, boxY, boxWidthNoBar, boxHeightNoBar, false);
+        renderer.drawText(READER_FONT_ID, boxXNoBar + boxMargin, boxY + boxMargin, "Indexing...");
+        renderer.drawRect(boxXNoBar + 5, boxY + 5, boxWidthNoBar - 10, boxHeightNoBar - 10);
         renderer.displayBuffer();
         pagesUntilFullRefresh = 0;
       }
 
       section->setupCacheDir();
+
+      // Setup callback - only called for chapters >= 50KB, redraws with progress bar
+      auto progressSetup = [this, boxXWithBar, boxWidthWithBar, boxHeightWithBar, boxMargin, barX, barY, barWidth,
+                            barHeight]() {
+        renderer.fillRect(boxXWithBar, boxY, boxWidthWithBar, boxHeightWithBar, false);
+        renderer.drawText(READER_FONT_ID, boxXWithBar + boxMargin, boxY + boxMargin, "Indexing...");
+        renderer.drawRect(boxXWithBar + 5, boxY + 5, boxWidthWithBar - 10, boxHeightWithBar - 10);
+        renderer.drawRect(barX, barY, barWidth, barHeight);
+        renderer.displayBuffer();
+      };
+
+      // Progress callback to update progress bar
+      auto progressCallback = [this, barX, barY, barWidth, barHeight](int progress) {
+        const int fillWidth = (barWidth - 2) * progress / 100;
+        renderer.fillRect(barX + 1, barY + 1, fillWidth, barHeight - 2, true);
+        renderer.displayBuffer(EInkDisplay::FAST_REFRESH);
+      };
+
       if (!section->persistPageDataToSD(READER_FONT_ID, lineCompression, marginTop, marginRight, marginBottom,
-                                        marginLeft, SETTINGS.extraParagraphSpacing)) {
+                                        marginLeft, SETTINGS.extraParagraphSpacing, progressSetup, progressCallback)) {
         Serial.printf("[%lu] [ERS] Failed to persist page data to SD\n", millis());
         section.reset();
         return;

src/activities/reader/EpubReaderChapterSelectionActivity.cpp

@@ -57,9 +57,9 @@ void EpubReaderChapterSelectionActivity::loop() {
 
   const bool skipPage = inputManager.getHeldTime() > SKIP_PAGE_MS;
 
-  if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
+  if (inputManager.wasReleased(InputManager::BTN_CONFIRM)) {
     onSelectSpineIndex(selectorIndex);
-  } else if (inputManager.wasPressed(InputManager::BTN_BACK)) {
+  } else if (inputManager.wasReleased(InputManager::BTN_BACK)) {
     onGoBack();
   } else if (prevReleased) {
     if (skipPage) {

src/activities/util/KeyboardEntryActivity.cpp

@@ -10,41 +10,55 @@ const char* const KeyboardEntryActivity::keyboard[NUM_ROWS] = {
 
 // Keyboard layouts - uppercase/symbols
 const char* const KeyboardEntryActivity::keyboardShift[NUM_ROWS] = {"~!@#$%^&*()_+", "QWERTYUIOP{}|", "ASDFGHJKL:\"",
-                                                                    "ZXCVBNM<>?", "^  _____<OK"};
+                                                                    "ZXCVBNM<>?", "SPECIAL ROW"};
 
-void KeyboardEntryActivity::setText(const std::string& newText) {
-  text = newText;
-  if (maxLength > 0 && text.length() > maxLength) {
-    text.resize(maxLength);
-  }
+void KeyboardEntryActivity::taskTrampoline(void* param) {
+  auto* self = static_cast<KeyboardEntryActivity*>(param);
+  self->displayTaskLoop();
 }
 
-void KeyboardEntryActivity::reset(const std::string& newTitle, const std::string& newInitialText) {
-  if (!newTitle.empty()) {
-    title = newTitle;
+void KeyboardEntryActivity::displayTaskLoop() {
+  while (true) {
+    if (updateRequired) {
+      updateRequired = false;
+      xSemaphoreTake(renderingMutex, portMAX_DELAY);
+      render();
+      xSemaphoreGive(renderingMutex);
+    }
+    vTaskDelay(10 / portTICK_PERIOD_MS);
   }
-  text = newInitialText;
-  selectedRow = 0;
-  selectedCol = 0;
-  shiftActive = false;
-  complete = false;
-  cancelled = false;
 }
 
 void KeyboardEntryActivity::onEnter() {
   Activity::onEnter();
 
-  // Reset state when entering the activity
-  complete = false;
-  cancelled = false;
+  renderingMutex = xSemaphoreCreateMutex();
+
+  // Trigger first update
+  updateRequired = true;
+
+  xTaskCreate(&KeyboardEntryActivity::taskTrampoline, "KeyboardEntryActivity",
+              2048,               // Stack size
+              this,               // Parameters
+              1,                  // Priority
+              &displayTaskHandle  // Task handle
+  );
 }
 
-void KeyboardEntryActivity::loop() {
-  handleInput();
-  render(10);
+void KeyboardEntryActivity::onExit() {
+  Activity::onExit();
+
+  // Wait until not rendering to delete task to avoid killing mid-instruction to EPD
+  xSemaphoreTake(renderingMutex, portMAX_DELAY);
+  if (displayTaskHandle) {
+    vTaskDelete(displayTaskHandle);
+    displayTaskHandle = nullptr;
+  }
+  vSemaphoreDelete(renderingMutex);
+  renderingMutex = nullptr;
 }
 
-int KeyboardEntryActivity::getRowLength(int row) const {
+int KeyboardEntryActivity::getRowLength(const int row) const {
   if (row < 0 || row >= NUM_ROWS) return 0;
 
   // Return actual length of each row based on keyboard layout
@@ -58,7 +72,7 @@ int KeyboardEntryActivity::getRowLength(int row) const {
     case 3:
       return 10;  // zxcvbnm,./
     case 4:
-      return 10;  // ^, space (5 wide), backspace, OK (2 wide)
+      return 10;  // caps (2 wide), space (5 wide), backspace (2 wide), OK
     default:
       return 0;
   }
@@ -75,8 +89,8 @@ char KeyboardEntryActivity::getSelectedChar() const {
 
 void KeyboardEntryActivity::handleKeyPress() {
   // Handle special row (bottom row with shift, space, backspace, done)
-  if (selectedRow == SHIFT_ROW) {
-    if (selectedCol == SHIFT_COL) {
+  if (selectedRow == SPECIAL_ROW) {
+    if (selectedCol >= SHIFT_COL && selectedCol < SPACE_COL) {
       // Shift toggle
       shiftActive = !shiftActive;
       return;
@@ -90,7 +104,7 @@ void KeyboardEntryActivity::handleKeyPress() {
       return;
     }
 
-    if (selectedCol == BACKSPACE_COL) {
+    if (selectedCol >= BACKSPACE_COL && selectedCol < DONE_COL) {
       // Backspace
       if (!text.empty()) {
         text.pop_back();
@@ -100,7 +114,6 @@ void KeyboardEntryActivity::handleKeyPress() {
 
     if (selectedCol >= DONE_COL) {
       // Done button
-      complete = true;
       if (onComplete) {
         onComplete(text);
       }
@@ -109,42 +122,61 @@ void KeyboardEntryActivity::handleKeyPress() {
   }
 
   // Regular character
-  char c = getSelectedChar();
-  if (c != '\0' && c != '^' && c != '_' && c != '<') {
-    if (maxLength == 0 || text.length() < maxLength) {
-      text += c;
-      // Auto-disable shift after typing a letter
-      if (shiftActive && ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))) {
-        shiftActive = false;
-      }
+  const char c = getSelectedChar();
+  if (c == '\0') {
+    return;
+  }
+
+  if (maxLength == 0 || text.length() < maxLength) {
+    text += c;
+    // Auto-disable shift after typing a letter
+    if (shiftActive && ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))) {
+      shiftActive = false;
     }
   }
 }
 
-bool KeyboardEntryActivity::handleInput() {
-  if (complete || cancelled) {
-    return false;
-  }
-
-  bool handled = false;
-
+void KeyboardEntryActivity::loop() {
   // Navigation
   if (inputManager.wasPressed(InputManager::BTN_UP)) {
     if (selectedRow > 0) {
       selectedRow--;
       // Clamp column to valid range for new row
-      int maxCol = getRowLength(selectedRow) - 1;
+      const int maxCol = getRowLength(selectedRow) - 1;
       if (selectedCol > maxCol) selectedCol = maxCol;
     }
-    handled = true;
-  } else if (inputManager.wasPressed(InputManager::BTN_DOWN)) {
+    updateRequired = true;
+  }
+
+  if (inputManager.wasPressed(InputManager::BTN_DOWN)) {
     if (selectedRow < NUM_ROWS - 1) {
       selectedRow++;
-      int maxCol = getRowLength(selectedRow) - 1;
+      const int maxCol = getRowLength(selectedRow) - 1;
       if (selectedCol > maxCol) selectedCol = maxCol;
     }
-    handled = true;
-  } else if (inputManager.wasPressed(InputManager::BTN_LEFT)) {
+    updateRequired = true;
+  }
+
+  if (inputManager.wasPressed(InputManager::BTN_LEFT)) {
+    // Special bottom row case
+    if (selectedRow == SPECIAL_ROW) {
+      // Bottom row has special key widths
+      if (selectedCol >= SHIFT_COL && selectedCol < SPACE_COL) {
+        // In shift key, do nothing
+      } else if (selectedCol >= SPACE_COL && selectedCol < BACKSPACE_COL) {
+        // In space bar, move to shift
+        selectedCol = SHIFT_COL;
+      } else if (selectedCol >= BACKSPACE_COL && selectedCol < DONE_COL) {
+        // In backspace, move to space
+        selectedCol = SPACE_COL;
+      } else if (selectedCol >= DONE_COL) {
+        // At done button, move to backspace
+        selectedCol = BACKSPACE_COL;
+      }
+      updateRequired = true;
+      return;
+    }
+
     if (selectedCol > 0) {
       selectedCol--;
     } else if (selectedRow > 0) {
@@ -152,9 +184,31 @@ bool KeyboardEntryActivity::handleInput() {
       selectedRow--;
       selectedCol = getRowLength(selectedRow) - 1;
     }
-    handled = true;
-  } else if (inputManager.wasPressed(InputManager::BTN_RIGHT)) {
-    int maxCol = getRowLength(selectedRow) - 1;
+    updateRequired = true;
+  }
+
+  if (inputManager.wasPressed(InputManager::BTN_RIGHT)) {
+    const int maxCol = getRowLength(selectedRow) - 1;
+
+    // Special bottom row case
+    if (selectedRow == SPECIAL_ROW) {
+      // Bottom row has special key widths
+      if (selectedCol >= SHIFT_COL && selectedCol < SPACE_COL) {
+        // In shift key, move to space
+        selectedCol = SPACE_COL;
+      } else if (selectedCol >= SPACE_COL && selectedCol < BACKSPACE_COL) {
+        // In space bar, move to backspace
+        selectedCol = BACKSPACE_COL;
+      } else if (selectedCol >= BACKSPACE_COL && selectedCol < DONE_COL) {
+        // In backspace, move to done
+        selectedCol = DONE_COL;
+      } else if (selectedCol >= DONE_COL) {
+        // At done button, do nothing
+      }
+      updateRequired = true;
+      return;
+    }
+
     if (selectedCol < maxCol) {
       selectedCol++;
     } else if (selectedRow < NUM_ROWS - 1) {
@@ -162,35 +216,34 @@ bool KeyboardEntryActivity::handleInput() {
       selectedRow++;
       selectedCol = 0;
     }
-    handled = true;
+    updateRequired = true;
   }
 
   // Selection
   if (inputManager.wasPressed(InputManager::BTN_CONFIRM)) {
     handleKeyPress();
-    handled = true;
+    updateRequired = true;
   }
 
   // Cancel
   if (inputManager.wasPressed(InputManager::BTN_BACK)) {
-    cancelled = true;
     if (onCancel) {
       onCancel();
     }
-    handled = true;
+    updateRequired = true;
   }
-
-  return handled;
 }
 
-void KeyboardEntryActivity::render(int startY) const {
+void KeyboardEntryActivity::render() const {
   const auto pageWidth = GfxRenderer::getScreenWidth();
 
+  renderer.clearScreen();
+
   // Draw title
   renderer.drawCenteredText(UI_FONT_ID, startY, title.c_str(), true, REGULAR);
 
   // Draw input field
-  int inputY = startY + 22;
+  const int inputY = startY + 22;
   renderer.drawText(UI_FONT_ID, 10, inputY, "[");
 
   std::string displayText;
@@ -204,9 +257,9 @@ void KeyboardEntryActivity::render(int startY) const {
   displayText += "_";
 
   // Truncate if too long for display - use actual character width from font
-  int charWidth = renderer.getSpaceWidth(UI_FONT_ID);
-  if (charWidth < 1) charWidth = 8;  // Fallback to approximate width
-  int maxDisplayLen = (pageWidth - 40) / charWidth;
+  int approxCharWidth = renderer.getSpaceWidth(UI_FONT_ID);
+  if (approxCharWidth < 1) approxCharWidth = 8;  // Fallback to approximate width
+  const int maxDisplayLen = (pageWidth - 40) / approxCharWidth;
   if (displayText.length() > static_cast<size_t>(maxDisplayLen)) {
     displayText = "..." + displayText.substr(displayText.length() - maxDisplayLen + 3);
   }
@@ -215,22 +268,22 @@ void KeyboardEntryActivity::render(int startY) const {
   renderer.drawText(UI_FONT_ID, pageWidth - 15, inputY, "]");
 
   // Draw keyboard - use compact spacing to fit 5 rows on screen
-  int keyboardStartY = inputY + 25;
-  const int keyWidth = 18;
-  const int keyHeight = 18;
-  const int keySpacing = 3;
+  const int keyboardStartY = inputY + 25;
+  constexpr int keyWidth = 18;
+  constexpr int keyHeight = 18;
+  constexpr int keySpacing = 3;
 
   const char* const* layout = shiftActive ? keyboardShift : keyboard;
 
   // Calculate left margin to center the longest row (13 keys)
-  int maxRowWidth = KEYS_PER_ROW * (keyWidth + keySpacing);
-  int leftMargin = (pageWidth - maxRowWidth) / 2;
+  constexpr int maxRowWidth = KEYS_PER_ROW * (keyWidth + keySpacing);
+  const int leftMargin = (pageWidth - maxRowWidth) / 2;
 
   for (int row = 0; row < NUM_ROWS; row++) {
-    int rowY = keyboardStartY + row * (keyHeight + keySpacing);
+    const int rowY = keyboardStartY + row * (keyHeight + keySpacing);
 
     // Left-align all rows for consistent navigation
-    int startX = leftMargin;
+    const int startX = leftMargin;
 
     // Handle bottom row (row 4) specially with proper multi-column keys
     if (row == 4) {
@@ -240,64 +293,37 @@ void KeyboardEntryActivity::render(int startY) const {
       int currentX = startX;
 
       // CAPS key (logical col 0, spans 2 key widths)
-      int capsWidth = 2 * keyWidth + keySpacing;
-      bool capsSelected = (selectedRow == 4 && selectedCol == SHIFT_COL);
-      if (capsSelected) {
-        renderer.drawText(UI_FONT_ID, currentX - 2, rowY, "[");
-        renderer.drawText(UI_FONT_ID, currentX + capsWidth - 4, rowY, "]");
-      }
-      renderer.drawText(UI_FONT_ID, currentX + 2, rowY, shiftActive ? "CAPS" : "caps");
-      currentX += capsWidth + keySpacing;
+      const bool capsSelected = (selectedRow == 4 && selectedCol >= SHIFT_COL && selectedCol < SPACE_COL);
+      renderItemWithSelector(currentX + 2, rowY, shiftActive ? "CAPS" : "caps", capsSelected);
+      currentX += 2 * (keyWidth + keySpacing);
 
       // Space bar (logical cols 2-6, spans 5 key widths)
-      int spaceWidth = 5 * keyWidth + 4 * keySpacing;
-      bool spaceSelected = (selectedRow == 4 && selectedCol >= SPACE_COL && selectedCol < BACKSPACE_COL);
-      if (spaceSelected) {
-        renderer.drawText(UI_FONT_ID, currentX - 2, rowY, "[");
-        renderer.drawText(UI_FONT_ID, currentX + spaceWidth - 4, rowY, "]");
-      }
-      // Draw centered underscores for space bar
-      int spaceTextX = currentX + (spaceWidth / 2) - 12;
-      renderer.drawText(UI_FONT_ID, spaceTextX, rowY, "_____");
-      currentX += spaceWidth + keySpacing;
+      const bool spaceSelected = (selectedRow == 4 && selectedCol >= SPACE_COL && selectedCol < BACKSPACE_COL);
+      const int spaceTextWidth = renderer.getTextWidth(UI_FONT_ID, "_____");
+      const int spaceXWidth = 5 * (keyWidth + keySpacing);
+      const int spaceXPos = currentX + (spaceXWidth - spaceTextWidth) / 2;
+      renderItemWithSelector(spaceXPos, rowY, "_____", spaceSelected);
+      currentX += spaceXWidth;
 
       // Backspace key (logical col 7, spans 2 key widths)
-      int bsWidth = 2 * keyWidth + keySpacing;
-      bool bsSelected = (selectedRow == 4 && selectedCol == BACKSPACE_COL);
-      if (bsSelected) {
-        renderer.drawText(UI_FONT_ID, currentX - 2, rowY, "[");
-        renderer.drawText(UI_FONT_ID, currentX + bsWidth - 4, rowY, "]");
-      }
-      renderer.drawText(UI_FONT_ID, currentX + 6, rowY, "<-");
-      currentX += bsWidth + keySpacing;
+      const bool bsSelected = (selectedRow == 4 && selectedCol >= BACKSPACE_COL && selectedCol < DONE_COL);
+      renderItemWithSelector(currentX + 2, rowY, "<-", bsSelected);
+      currentX += 2 * (keyWidth + keySpacing);
 
       // OK button (logical col 9, spans 2 key widths)
-      int okWidth = 2 * keyWidth + keySpacing;
-      bool okSelected = (selectedRow == 4 && selectedCol >= DONE_COL);
-      if (okSelected) {
-        renderer.drawText(UI_FONT_ID, currentX - 2, rowY, "[");
-        renderer.drawText(UI_FONT_ID, currentX + okWidth - 4, rowY, "]");
-      }
-      renderer.drawText(UI_FONT_ID, currentX + 8, rowY, "OK");
-
+      const bool okSelected = (selectedRow == 4 && selectedCol >= DONE_COL);
+      renderItemWithSelector(currentX + 2, rowY, "OK", okSelected);
     } else {
       // Regular rows: render each key individually
       for (int col = 0; col < getRowLength(row); col++) {
-        int keyX = startX + col * (keyWidth + keySpacing);
-
         // Get the character to display
-        char c = layout[row][col];
+        const char c = layout[row][col];
         std::string keyLabel(1, c);
+        const int charWidth = renderer.getTextWidth(UI_FONT_ID, keyLabel.c_str());
 
-        // Draw selection highlight
-        bool isSelected = (row == selectedRow && col == selectedCol);
-
-        if (isSelected) {
-          renderer.drawText(UI_FONT_ID, keyX - 2, rowY, "[");
-          renderer.drawText(UI_FONT_ID, keyX + keyWidth - 4, rowY, "]");
-        }
-
-        renderer.drawText(UI_FONT_ID, keyX + 2, rowY, keyLabel.c_str());
+        const int keyX = startX + col * (keyWidth + keySpacing) + (keyWidth - charWidth) / 2;
+        const bool isSelected = row == selectedRow && col == selectedCol;
+        renderItemWithSelector(keyX, rowY, keyLabel.c_str(), isSelected);
       }
     }
   }
@@ -305,4 +331,15 @@ void KeyboardEntryActivity::render(int startY) const {
   // Draw help text at absolute bottom of screen (consistent with other screens)
   const auto pageHeight = GfxRenderer::getScreenHeight();
   renderer.drawText(SMALL_FONT_ID, 10, pageHeight - 30, "Navigate: D-pad | Select: OK | Cancel: BACK");
+  renderer.displayBuffer();
+}
+
+void KeyboardEntryActivity::renderItemWithSelector(const int x, const int y, const char* item,
+                                                   const bool isSelected) const {
+  if (isSelected) {
+    const int itemWidth = renderer.getTextWidth(UI_FONT_ID, item);
+    renderer.drawText(UI_FONT_ID, x - 6, y, "[");
+    renderer.drawText(UI_FONT_ID, x + itemWidth, y, "]");
+  }
+  renderer.drawText(UI_FONT_ID, x, y, item);
 }

src/activities/util/KeyboardEntryActivity.h

@@ -1,9 +1,13 @@
 #pragma once
 #include <GfxRenderer.h>
 #include <InputManager.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/semphr.h>
+#include <freertos/task.h>
 
 #include <functional>
 #include <string>
+#include <utility>
 
 #include "../Activity.h"
 
@@ -30,80 +34,44 @@ class KeyboardEntryActivity : public Activity {
    * @param inputManager Reference to InputManager for handling input
    * @param title Title to display above the keyboard
    * @param initialText Initial text to show in the input field
+   * @param startY Y position to start rendering the keyboard
    * @param maxLength Maximum length of input text (0 for unlimited)
    * @param isPassword If true, display asterisks instead of actual characters
+   * @param onComplete Callback invoked when input is complete
+   * @param onCancel Callback invoked when input is cancelled
    */
-  KeyboardEntryActivity(GfxRenderer& renderer, InputManager& inputManager, const std::string& title = "Enter Text",
-                        const std::string& initialText = "", const size_t maxLength = 0, const bool isPassword = false)
+  explicit KeyboardEntryActivity(GfxRenderer& renderer, InputManager& inputManager, std::string title = "Enter Text",
+                                 std::string initialText = "", const int startY = 10, const size_t maxLength = 0,
+                                 const bool isPassword = false, OnCompleteCallback onComplete = nullptr,
+                                 OnCancelCallback onCancel = nullptr)
       : Activity("KeyboardEntry", renderer, inputManager),
-        title(title),
-        text(initialText),
+        title(std::move(title)),
+        text(std::move(initialText)),
+        startY(startY),
         maxLength(maxLength),
-        isPassword(isPassword) {}
-
-  /**
-   * Handle button input. Call this in your main loop.
-   * @return true if input was handled, false otherwise
-   */
-  bool handleInput();
-
-  /**
-   * Render the keyboard at the specified Y position.
-   * @param startY Y-coordinate where keyboard rendering starts (default 10)
-   */
-  void render(int startY = 10) const;
-
-  /**
-   * Get the current text entered by the user.
-   */
-  const std::string& getText() const { return text; }
-
-  /**
-   * Set the current text.
-   */
-  void setText(const std::string& newText);
-
-  /**
-   * Check if the user has completed text entry (pressed OK on Done).
-   */
-  bool isComplete() const { return complete; }
-
-  /**
-   * Check if the user has cancelled text entry.
-   */
-  bool isCancelled() const { return cancelled; }
-
-  /**
-   * Reset the keyboard state for reuse.
-   */
-  void reset(const std::string& newTitle = "", const std::string& newInitialText = "");
-
-  /**
-   * Set callback for when input is complete.
-   */
-  void setOnComplete(OnCompleteCallback callback) { onComplete = callback; }
-
-  /**
-   * Set callback for when input is cancelled.
-   */
-  void setOnCancel(OnCancelCallback callback) { onCancel = callback; }
+        isPassword(isPassword),
+        onComplete(std::move(onComplete)),
+        onCancel(std::move(onCancel)) {}
 
   // Activity overrides
   void onEnter() override;
+  void onExit() override;
   void loop() override;
 
  private:
   std::string title;
+  int startY;
   std::string text;
   size_t maxLength;
   bool isPassword;
+  TaskHandle_t displayTaskHandle = nullptr;
+  SemaphoreHandle_t renderingMutex = nullptr;
+  bool updateRequired = false;
 
   // Keyboard state
   int selectedRow = 0;
   int selectedCol = 0;
   bool shiftActive = false;
-  bool complete = false;
-  bool cancelled = false;
 
   // Callbacks
   OnCompleteCallback onComplete;
@@ -116,16 +84,17 @@ class KeyboardEntryActivity : public Activity {
   static const char* const keyboardShift[NUM_ROWS];
 
   // Special key positions (bottom row)
-  static constexpr int SHIFT_ROW = 4;
+  static constexpr int SPECIAL_ROW = 4;
   static constexpr int SHIFT_COL = 0;
-  static constexpr int SPACE_ROW = 4;
   static constexpr int SPACE_COL = 2;
-  static constexpr int BACKSPACE_ROW = 4;
   static constexpr int BACKSPACE_COL = 7;
-  static constexpr int DONE_ROW = 4;
   static constexpr int DONE_COL = 9;
 
+  static void taskTrampoline(void* param);
+  [[noreturn]] void displayTaskLoop();
   char getSelectedChar() const;
   void handleKeyPress();
   int getRowLength(int row) const;
+  void render() const;
+  void renderItemWithSelector(int x, int y, const char* item, bool isSelected) const;
 };