feat(travel): Optimize arrival data updates and enhance UI responsiveness

main/ui/apps/travel/ui/main.cpp

@@ -160,8 +160,10 @@ void MainUI::update_arrivals(const std::vector<RouteArrivalData>& arrival_data)
     return;
   }
 
-  // Hide message label
+  // Hide message label only if it's currently visible
+  if (!lv_obj_has_flag(msg_label_, LV_OBJ_FLAG_HIDDEN)) {
     lv_obj_add_flag(msg_label_, LV_OBJ_FLAG_HIDDEN);
+  }
 
   // Update each route display
   for (int i = 0; i < MAX_DISPLAY_ROUTES; i++) {
@@ -186,17 +188,21 @@ void MainUI::update_route_display_(RouteDisplay& display, const RouteArrivalData
     display.cached_visible = true;
   }
 
-  // Update header with line color
+  // Update header text (station -> direction)
   std::string header_text = data.route.station_name + " -> " + data.route.direction_name;
   if (header_text != display.cached_header_text) {
     lv_label_set_text(display.header, header_text.c_str());
     display.cached_header_text = header_text;
   }
 
+  // Update line color only if changed
+  if (data.route.line_color != display.cached_line_color) {
     if (!data.route.line_color.empty()) {
       lv_color_t line_color = hex_to_lv_color_(data.route.line_color);
       lv_obj_set_style_text_color(display.header, line_color, 0);
     }
+    display.cached_line_color = data.route.line_color;
+  }
 
   // Update arrival labels - only if text changed
   for (int i = 0; i < MAX_ARRIVALS_PER_ROUTE; i++) {
@@ -217,23 +223,28 @@ void MainUI::update_route_display_(RouteDisplay& display, const RouteArrivalData
       display.cached_arrival_texts[i] = arrival_text;
     }
 
-    // Handle visibility
+    // Handle visibility only if changed
+    if (should_show != display.cached_arrival_visible[i]) {
       if (should_show) {
-      if (lv_obj_has_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN)) {
         lv_obj_clear_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN);
-      }
       } else {
-      if (!lv_obj_has_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN)) {
         lv_obj_add_flag(display.arrival_labels[i], LV_OBJ_FLAG_HIDDEN);
       }
+      display.cached_arrival_visible[i] = should_show;
     }
   }
 
   // Show error if any
   if (!data.is_valid && !data.error_message.empty()) {
     std::string error_text = "  錯誤: " + data.error_message;
+    if (error_text != display.cached_arrival_texts[0]) {
       lv_label_set_text(display.arrival_labels[0], error_text.c_str());
+      display.cached_arrival_texts[0] = error_text;
+    }
+    if (!display.cached_arrival_visible[0]) {
       lv_obj_clear_flag(display.arrival_labels[0], LV_OBJ_FLAG_HIDDEN);
+      display.cached_arrival_visible[0] = true;
+    }
   }
 }
 
@@ -244,7 +255,10 @@ void MainUI::update_last_refresh_time(const std::string& time_str) {
   }
 
   std::string full_text = "更新: " + time_str;
+  if (full_text != cached_refresh_time_text) {
     lv_label_set_text(refresh_time_label_, full_text.c_str());
+    cached_refresh_time_text = full_text;
+  }
 
   lvgl_port_unlock();
 }

main/ui/apps/travel/ui/main.h

@@ -37,6 +37,7 @@ private:
   lv_obj_t* settings_btn_ = nullptr;
   lv_obj_t* refresh_time_label_ = nullptr;
   lv_obj_t* msg_label_ = nullptr;
+  std::string cached_refresh_time_text;
 
   // Route display containers (up to MAX_ROUTES)
   struct RouteDisplay {
@@ -46,7 +47,9 @@ private:
 
     // Cached values for change detection
     std::string cached_header_text;
+    std::string cached_line_color;
     std::string cached_arrival_texts[3];
+    bool cached_arrival_visible[3] = {false, false, false};
     bool cached_visible = false;
   };
   RouteDisplay route_displays_[5];

main/ui/apps/travel/ui/main_handler.cpp

@@ -238,8 +238,11 @@ void MainUIHandler::fetch_and_update_arrivals_() {
     arrival_data.push_back(data);
   }
 
-  // Update UI
+  // Update UI only if data changed
+  if (has_arrival_data_changed_(arrival_data)) {
     main_ui_->update_arrivals(arrival_data);
+    cached_arrival_data_ = arrival_data;
+  }
   main_ui_->update_last_refresh_time(get_current_time_string_());
 }
 
@@ -296,6 +299,37 @@ std::string MainUIHandler::get_current_time_string_() {
   return std::string(buffer);
 }
 
+bool MainUIHandler::has_arrival_data_changed_(const std::vector<RouteArrivalData>& new_data) {
+  if (new_data.size() != cached_arrival_data_.size()) {
+    return true;
+  }
+
+  for (size_t i = 0; i < new_data.size(); i++) {
+    const auto& new_route = new_data[i];
+    const auto& cached_route = cached_arrival_data_[i];
+
+    if (new_route.route.station_code != cached_route.route.station_code ||
+        new_route.route.direction != cached_route.route.direction ||
+        new_route.is_valid != cached_route.is_valid ||
+        new_route.error_message != cached_route.error_message) {
+      return true;
+    }
+
+    if (new_route.arrivals.size() != cached_route.arrivals.size()) {
+      return true;
+    }
+
+    for (size_t j = 0; j < new_route.arrivals.size(); j++) {
+      if (new_route.arrivals[j].arrival_time != cached_route.arrivals[j].arrival_time ||
+          new_route.arrivals[j].arrival_time_full != cached_route.arrivals[j].arrival_time_full) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
 void MainUIHandler::on_settings_button_clicked_static_(lv_event_t* e) {
   MainUIHandler* handler = static_cast<MainUIHandler*>(lv_event_get_user_data(e));
   if (handler) {

main/ui/apps/travel/ui/main_handler.h

@@ -47,6 +47,7 @@ private:
 
   void on_settings_button_clicked_();
   void fetch_and_update_arrivals_();
+  bool has_arrival_data_changed_(const std::vector<RouteArrivalData>& new_data);
   std::string format_arrival_time_(const std::string& api_time);
   std::string format_arrival_time_full_(const std::string& api_time);
   std::string get_current_time_string_();
@@ -65,6 +66,8 @@ private:
   SettingsButtonCallback on_settings_callback_ = nullptr;
   void* settings_callback_user_data_ = nullptr;
 
+  std::vector<RouteArrivalData> cached_arrival_data_;
+
   static constexpr uint32_t LVGL_LOCK_TIMEOUT_MS = 4000;
 };