Implement DirtyValues for Quick Settings screen

Author: SteveAmor

src/displayapp/screens/settings/QuickSettings.cpp

@@ -119,9 +119,8 @@ QuickSettings::QuickSettings(Pinetime::Applications::DisplayApp* app,
   lv_obj_set_style_local_text_font(lbl_btn, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, &lv_font_sys_48);
   lv_label_set_text_static(lbl_btn, Symbols::settings);
 
-  taskUpdate = lv_task_create(lv_update_task, 5000, LV_TASK_PRIO_MID, this);
-
   UpdateScreen();
+  taskUpdate = lv_task_create(lv_update_task, LV_DISP_DEF_REFR_PERIOD, LV_TASK_PRIO_MID, this);
 }
 
 QuickSettings::~QuickSettings() {
@@ -132,8 +131,11 @@ QuickSettings::~QuickSettings() {
 }
 
 void QuickSettings::UpdateScreen() {
-  lv_label_set_text(label_time, dateTimeController.FormattedTime().c_str());
   statusIcons.Update();
+  currentDateTime = std::chrono::time_point_cast<std::chrono::minutes>(dateTimeController.CurrentDateTime());
+  if (currentDateTime.IsUpdated()) {
+    lv_label_set_text(label_time, dateTimeController.FormattedTime().c_str());
+  }
 }
 
 void QuickSettings::OnButtonEvent(lv_obj_t* object) {

src/displayapp/screens/settings/QuickSettings.h

@@ -9,6 +9,7 @@
 #include "components/settings/Settings.h"
 #include "components/battery/BatteryController.h"
 #include "displayapp/widgets/StatusIcons.h"
+#include "utility/DirtyValue.h"
 
 namespace Pinetime {
 
@@ -34,6 +35,9 @@ namespace Pinetime {
 
       private:
         DisplayApp* app;
+
+        Utility::DirtyValue<std::chrono::time_point<std::chrono::system_clock, std::chrono::minutes>> currentDateTime {};
+
         Controllers::DateTime& dateTimeController;
         Controllers::BrightnessController& brightness;
         Controllers::MotorController& motorController;