Added the display auto power off functionality

src/app/ScreenManager.cpp

@@ -1,8 +1,6 @@
 #include "ScreenManager.h"
 
-ScreenManager::ScreenManager(Adafruit_SSD1306 &display, SDCardManager *sdCardManager) : _displayRef(display), _error(OK)
+ScreenManager::ScreenManager(Adafruit_SSD1306 &display, SDCardManager *sdCardManager) : _displayRef(display)
-, _displayColorInverted(false), _displayDimmed(false), _enabled(true), _refreshRateHz(1), _refreshInterval(1000), _timeRef(0),_forceRefresh(false)
-, _currentView(NO_CURRENT_VIEW), _tail(NULL)
 , _viewNotFound{&(displayError), (ErrorInfo *)malloc(sizeof(ErrorInfo)), RESERVED_VIEW_UID, NULL, NULL}
 , _viewFuncUndefined{&(displayError), (ErrorInfo *)malloc(sizeof(ErrorInfo)), RESERVED_VIEW_UID, NULL, NULL}
 , _currentViewUndefined{&(displayError), (ErrorInfo *)malloc(sizeof(ErrorInfo)), RESERVED_VIEW_UID, NULL, NULL}
@@ -46,6 +44,7 @@ boolean ScreenManager::applyCfgFromSD()
           _displayRef.invertDisplay(cfgDictionary->get("INVERTED")->booleanValue());
           _displayRef.dim(cfgDictionary->get("DIMMED")->booleanValue());
           _displayRef.setTextColor(WHITE);
+          setAutoOFFDelay(cfgDictionary->get("AUTO_OFF")->uintValue());
           
           delete cfgDictionary;
           return true;
@@ -212,6 +211,13 @@ ScreenManager::ViewLink* ScreenManager::getLinkByUID(ViewLinkedList viewLinkedLi
 
 void ScreenManager::run()
 {
+  //We handle the auto off logic here
+  if(_autoOFFDelay && _enabled)
+  {
+    if(millis() - _autoOFFDelayRef > _autoOFFDelay)
+      setEnabled(false);
+  }
+
   if((millis() - _timeRef < _refreshInterval && !_forceRefresh) || !_enabled) return;
 
   _timeRef = millis();
@@ -262,7 +268,8 @@ void ScreenManager::forceRefresh()
 
 boolean ScreenManager::displayView(const uint8_t UID)
 {
-  if(!_enabled) return true;
+  _autoOFFDelayRef = millis();
+  if(!_enabled) return false;
   _forceRefresh = true;
   ViewLink *viewLink = getLinkByUID(_viewLinkedList, UID);
   
@@ -290,6 +297,8 @@ boolean ScreenManager::displayView(const uint8_t UID)
 
 void ScreenManager::displayNextView()
 {
+  _autoOFFDelayRef = millis();
+  if(!_enabled) return;
   _forceRefresh = true;
   _error = OK;
   if(isListEmpty(_viewLinkedList))return;
@@ -323,6 +332,8 @@ void ScreenManager::displayNextView()
 
 void ScreenManager::displayPreviousView()
 {
+  _autoOFFDelayRef = millis();
+  if(!_enabled) return;
   _forceRefresh = true;
   _error = OK;
   if(isListEmpty(_tail))return;
@@ -368,11 +379,14 @@ void ScreenManager::dimDisplay(const boolean dimmed)
 
 void ScreenManager::sleep()
 {
+  _enabled = false;
   _displayRef.sleep();
 }
 
 void ScreenManager::wakeUp()
 {
+  _enabled  = true;
+  _autoOFFDelayRef = millis();
   _displayRef.wakeUp();
 }
 
@@ -423,13 +437,17 @@ void ScreenManager::clearViews()
 
 void ScreenManager::setEnabled(boolean value)
 {
-  _enabled = value;
   if(value)
     wakeUp();
   else
     sleep();
 }
 
+void ScreenManager::setAutoOFFDelay(const uint64_t delay)
+{
+  _autoOFFDelay = delay;
+}
+
 boolean ScreenManager::getEnabled()
 {
   return _enabled;
@@ -454,6 +472,11 @@ int ScreenManager::getCurrentViewUID() const
   return _currentView->UID < 0 ? -1 : _currentView->UID;
 }
 
+uint64_t ScreenManager::getAutoOFFDelay() const
+{
+  return _autoOFFDelay;
+}
+
 boolean ScreenManager::displayError(Adafruit_SSD1306 &display, void *pData)
 {
   const ErrorInfo *errorInfo = (ErrorInfo *) pData;

src/app/ScreenManager.h

@@ -38,6 +38,7 @@ class ScreenManager
     void sleep();
     void wakeUp();
     void setEnabled(boolean value);
+    void setAutoOFFDelay(const uint64_t delay);
     boolean getEnabled();
     boolean init();
     void run();
@@ -48,6 +49,7 @@ class ScreenManager
     Orientation getDisplayOrientation() const;
     boolean isDisplayDimmed() const;
     int getCurrentViewUID() const;
+    uint64_t getAutoOFFDelay() const;
     unsigned char getViewCount();
 
     
@@ -66,15 +68,15 @@ class ScreenManager
     
     Adafruit_SSD1306 &_displayRef;
     ViewLinkedList _viewLinkedList;
-    Error _error;
+    Error _error = OK;
-    boolean _displayColorInverted;
+    boolean _displayColorInverted = false;
-    boolean _displayDimmed;
+    boolean _displayDimmed = false;
-    boolean _enabled;
+    boolean _enabled = true;
-    uint8_t _refreshRateHz;
+    uint8_t _refreshRateHz = 1;
-    uint16_t _refreshInterval;
+    uint16_t _refreshInterval = 1000;
-    uint64_t _timeRef;
+    uint64_t _timeRef = 0, _autoOFFDelayRef = 0, _autoOFFDelay = 0;
-    boolean _forceRefresh;
+    boolean _forceRefresh = false;
-    ViewLink *_currentView, *_tail;
+    ViewLink *_currentView = NO_CURRENT_VIEW, *_tail = nullptr;
     ViewLink _viewNotFound, _viewFuncUndefined, _currentViewUndefined, _viewFunctionFailedToExecute;
     SDCardManager *_sdCardManager;