Use shared_ptr for the screen history list.

Author: FiveTeethless

lib/3rd_party_adapters/LVGL/Screen.cpp

@@ -2,7 +2,7 @@
 #include <math.h>
 #include <stack>
 
-static std::stack<IScreen *> screenHistory;
+static std::stack<std::shared_ptr<IScreen>> screenHistory;
 
 static inline void IScreen_leave()
 {
@@ -12,8 +12,6 @@ static inline void IScreen_leave()
         //clear the current screen of lvgl
         lv_obj_clean(lv_scr_act());
 
-        //free up the memory of current screen
-        delete screenHistory.top();
         //remove current screen
         screenHistory.pop();
         //draw previous screen
@@ -257,7 +255,7 @@ void ScreenMenu::draw()
     lv_scr_load(screen);
 
     /* add the screen to the screens history list */
-    screenHistory.push(this);
+    screenHistory.push(shared_from_this());
 }
 
 /**
@@ -468,5 +466,5 @@ void ScreenValueModifier::draw()
     lv_scr_load(screen);
 
     /* add the screen to the screens history list */
-    screenHistory.push(this);
+    screenHistory.push(shared_from_this());
 }

lib/3rd_party_adapters/LVGL/Screen.hpp

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <lvgl.h>
+#include <memory>
 #include <user_interaction/MenuItem.hpp>
 
 /**
@@ -25,7 +26,7 @@ class IScreen
  * it receives a list of menu items for it's topology
  * 
  */
-class ScreenMenu final : public IScreen
+class ScreenMenu final : public IScreen, std::enable_shared_from_this<ScreenMenu>
 {
   public:
     ScreenMenu(MenuItemList itemList);
@@ -41,7 +42,7 @@ class ScreenMenu final : public IScreen
  * @brief Screen for value modification
  * 
  */
-class ScreenValueModifier final : public IScreen
+class ScreenValueModifier final : public IScreen, std::enable_shared_from_this<ScreenValueModifier>
 {
   public:
     ScreenValueModifier(const MenuItemValue *const menuItem);