Confirm cheat changes on closing window

Lang/English.pj.Lang

@@ -536,7 +536,8 @@
 #2059#  "Nintendo 64DD Japanese Retail IPL ROM not found.\nIt is required to play japanese region 64DD disk images.\n\nPlease select the required ROM in the Settings."
 #2061#  "Nintendo 64DD American Retail IPL ROM not found.\nIt is required to play american region 64DD disk images.\n\nPlease select the required ROM in the Settings."
 #2062#  "Nintendo 64DD Development IPL ROM not found.\nIt is required to play development 64DD disk images.\n\nPlease select the required ROM in the Settings."
-
+#2063#  "Failed to update cheat, it is invalid"
+#2064#  "Invalid Cheat"
 
 /*********************************************************************************
 * Android                                                                        *

Source/Project64-core/Multilanguage.h

@@ -577,6 +577,8 @@ enum LanguageStringID
     MSG_MSGBOX_WARNING_TITLE = 2060,
     MSG_USA_IPL_REQUIRED = 2061,
     MSG_TOOL_IPL_REQUIRED = 2062,
+    MSG_CHEAT_INVALID_MSG = 2063,
+    MSG_CHEAT_INVALID_TITLE = 2064,
 
     /*********************************************************************************
     * Android                                                                        *

Source/Project64-core/Multilanguage/LanguageClass.cpp

@@ -542,6 +542,8 @@ void CLanguage::LoadDefaultStrings(void)
     DEF_STR(MSG_IPL_REQUIRED, "Nintendo 64DD Japanese Retail IPL ROM not found.\nIt is required to play japanese region 64DD disk images.\n\nPlease select the required ROM in the Settings.");
     DEF_STR(MSG_USA_IPL_REQUIRED, "Nintendo 64DD American Retail IPL ROM not found.\nIt is required to play american region 64DD disk images.\n\nPlease select the required ROM in the Settings.");
     DEF_STR(MSG_TOOL_IPL_REQUIRED, "Nintendo 64DD Development IPL ROM not found.\nIt is required to play development 64DD disk images.\n\nPlease select the required ROM in the Settings.");
+    DEF_STR(MSG_CHEAT_INVALID_MSG, "Failed to update cheat, it is invalid");
+    DEF_STR(MSG_CHEAT_INVALID_TITLE, "Invalid Cheat");
 
     /*********************************************************************************
     * Android                                                                        *

Source/Project64/UserInterface/CheatClassUI.cpp

@@ -112,6 +112,11 @@ LRESULT CCheatsUI::OnDestroy(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/
 
 LRESULT CCheatsUI::OnCloseCmd(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
 {
+    if (m_EditCheat.ValuesChanged())
+    {
+        return 0;
+    }
+
     if (g_BaseSystem)
     {
         g_BaseSystem->ExternalEvent(SysEvent_ResumeCPU_Cheats);
@@ -1033,9 +1038,26 @@ bool CEditCheat::ValuesChanged(void)
         return true;
     }
     if (Result == IDYES)
+    {
+        bool validcodes, validoptions, nooptions;
+        CodeFormat  Format;
+        ReadCodeEntries(validcodes, validoptions, nooptions, Format);
+        if (!nooptions)
+        {
+            ReadOptions(validoptions, Format);
+        }
+
+        bool CanAdd = validcodes && (validoptions || nooptions) && GetDlgItem(IDC_CODE_NAME).GetWindowTextLength() > 0;
+        if (CanAdd)
         {
             SendMessage(WM_COMMAND, MAKELPARAM(IDC_ADD, 0));
         }
+        else
+        {
+            MessageBox(wGS(MSG_CHEAT_INVALID_MSG).c_str(), wGS(MSG_CHEAT_INVALID_TITLE).c_str(), MB_ICONERROR);
+            return true;
+        }
+    }
     return false;
 }
 

Source/Project64/UserInterface/CheatClassUI.h

@@ -14,6 +14,7 @@
 #include <Project64-core\N64System\Enhancement\EnhancementList.h>
 
 class CEditCheat;
+class CCheatsUI;
 
 class CCheatList :
     public CDialogImpl<CCheatList>
@@ -79,6 +80,8 @@ private:
 class CEditCheat :
     public CDialogImpl<CEditCheat>
 {
+    friend CCheatsUI;
+
 public:
     enum
     {