rough draft a callback inside HardwareAbstract

to show concept.

Platformio/HAL/HardwareAbstract.cpp

@@ -18,4 +18,14 @@ std::optional<HardwareAbstract::batteryStatus> HardwareAbstract::getBatteryStatu
         return currentStatus;
     }
     return std::nullopt;
-}
+}
+
+  void HardwareAbstract::notifyBatteryChange(HardwareAbstract::batteryStatus aStatus){
+    for (auto handler : mBatteryEventHandlers){
+        handler(aStatus);
+    }
+  }
+
+  void HardwareAbstract::onBatteryChange(std::function<void(HardwareAbstract::batteryStatus)> onBatteryStatusChangeHandler){
+    mBatteryEventHandlers.push_back(std::move(onBatteryStatusChangeHandler));
+  }

Platformio/HAL/HardwareAbstract.hpp

@@ -2,10 +2,12 @@
 // 2023 Matthew Colvin
 
 #pragma once
+#include <functional>
 #include <lvgl.h>
 #include <memory>
 #include <optional>
 #include <string>
+#include <vector>
 #include "BatteryInterface.h"
 #include "DisplayInterface.h"
 #include "wifiHandlerInterface.h"
@@ -34,6 +36,10 @@ public:
   /// @param message - Debug message
   virtual void debugPrint(std::string message) = 0;
 
+  // Didn't actually implement this but would need to set up something to intermittently notify of batteryChange.
+  void notifyBatteryChange(batteryStatus aStatus);
+  void onBatteryChange(std::function<void(batteryStatus)> onBatteryStatusChangeHandler);
+
   private:
     std::shared_ptr<BatteryInterface> mBattery;
     std::shared_ptr<wifiHandlerInterface> mWifiHandler;

Platformio/OmoteUI/OmoteUI.cpp

@@ -93,7 +93,7 @@ void OmoteUI::loopHandler(){
 void OmoteUI::layout_UI() {
 
   // --- LVGL UI Configuration ---
-    
+
   // Set the background color
   lv_obj_set_style_bg_color(lv_scr_act(), lv_color_black(), LV_PART_MAIN);
 
@@ -173,10 +173,10 @@ void OmoteUI::layout_UI() {
 
   // Add content to the Apple TV tab (3)
   // Add a nice apple tv logo
-  
+
   lv_obj_t* appleImg = imgs.addAppleTVIcon(tab3);
   lv_obj_align(appleImg, LV_ALIGN_CENTER, 0, -60);
-  
+
   // create two buttons and add their icons accordingly
   lv_obj_t *button = lv_btn_create(tab3);
   lv_obj_align(button, LV_ALIGN_BOTTOM_LEFT, 10, 0);
@@ -240,7 +240,7 @@ void OmoteUI::layout_UI() {
 
   brightnessIcon = imgs.addHighBrightnessIcon(menuBox);
   lv_obj_align(brightnessIcon, LV_ALIGN_TOP_RIGHT, 0, -1);
-  
+
   lv_obj_add_event_cb(
       slider, [](lv_event_t *e) { mInstance->bl_slider_event_cb(e); },
       LV_EVENT_VALUE_CHANGED, NULL);
@@ -307,6 +307,11 @@ void OmoteUI::layout_UI() {
   lv_obj_set_style_bg_color(menuBox, color_primary, LV_PART_MAIN);
   lv_obj_set_style_border_width(menuBox, 0, LV_PART_MAIN);
 
+  mHardware->onBatteryChange([menuLabel](HardwareAbstract::batteryStatus aCurrentBattery){
+    // I dont know enough about lvgl to do this but basically take aCurrentBattery and update UI elements here.
+    // See Notice menuLabel is captured and useable here.
+  });
+
   // Add content to the smart home tab (4)
 
   lv_obj_set_layout(tab4, LV_LAYOUT_FLEX);
@@ -490,7 +495,7 @@ void OmoteUI::layout_UI() {
   lv_obj_t *img1 = imgs.addLeftGradiant(lv_scr_act());
   lv_obj_align(img1, LV_ALIGN_BOTTOM_LEFT, 0, 0);
   lv_obj_set_size(img1, 30, 30); // stretch the 1-pixel high image to 30px
-  
+
   lv_obj_t* img2 = imgs.addRightGradiant(lv_scr_act());
   lv_obj_align(img2, LV_ALIGN_BOTTOM_RIGHT, 0, 0);
   lv_obj_set_size(img2, 30, 30);