diff --git a/Client/core/CMessageLoopHook.cpp b/Client/core/CMessageLoopHook.cpp
index 564563e0df0..2351d98a160 100644
--- a/Client/core/CMessageLoopHook.cpp
+++ b/Client/core/CMessageLoopHook.cpp
@@ -124,15 +124,37 @@ LRESULT CALLBACK CMessageLoopHook::ProcessMessage(HWND hwnd, UINT uMsg, WPARAM w
     // Alternate alt-tab system
     if (pThis && hwnd == pThis->GetHookedWindowHandle())
     {
-        if (uMsg == WM_ACTIVATE && LOWORD(wParam) == WA_ACTIVE)
+        if (uMsg == WM_ACTIVATE)
         {
-            GetVideoModeManager()->OnGainFocus();
-        }
-        if (uMsg == WM_ACTIVATE && LOWORD(wParam) == WA_INACTIVE)
-        {
-            GetVideoModeManager()->OnLoseFocus();
-            g_pCore->GetKeyBinds()->OnLoseFocus();
+            CModManager* pModManager = CModManager::GetSingletonPtr();
+            WORD         wState = LOWORD(wParam);
+
+            if (pModManager && pModManager->IsLoaded())
+            {
+                CClientBase* pBase = pModManager->GetCurrentMod();
+
+                if (pBase)
+                {
+                    bool bFocus = (wState == WA_CLICKACTIVE) || (wState == WA_ACTIVE);
+                    pBase->OnWindowFocusChange(bFocus);
+                }
+            }
+
+            switch (wState)
+            {
+                case WA_ACTIVE:
+                    GetVideoModeManager()->OnGainFocus();
+                    break;
+
+                case WA_INACTIVE:
+                {
+                    GetVideoModeManager()->OnLoseFocus();
+                    g_pCore->GetKeyBinds()->OnLoseFocus();
+                    break;
+                }
+            }
         }
+
         if (uMsg == WM_PAINT)
         {
             GetVideoModeManager()->OnPaint();
diff --git a/Client/mods/deathmatch/CClient.cpp b/Client/mods/deathmatch/CClient.cpp
index cb0eeb4834f..ab4cb37e7d3 100644
--- a/Client/mods/deathmatch/CClient.cpp
+++ b/Client/mods/deathmatch/CClient.cpp
@@ -314,6 +314,11 @@ void CClient::GetPlayerNames(std::vector<SString>& vPlayerNames)
     }
 }
 
+void CClient::OnWindowFocusChange(bool state)
+{
+    g_pClientGame->OnWindowFocusChange(state);
+}
+
 CClient::InitializeArguments CClient::ExtractInitializeArguments(const char* arguments)
 {
     // Format: "nickname [password]"
diff --git a/Client/mods/deathmatch/CClient.h b/Client/mods/deathmatch/CClient.h
index d8cdaa9668c..49c4a95c7d3 100644
--- a/Client/mods/deathmatch/CClient.h
+++ b/Client/mods/deathmatch/CClient.h
@@ -32,6 +32,8 @@ class CClient : public CClientBase
     bool HandleException(CExceptionInformation* pExceptionInformation);
     void GetPlayerNames(std::vector<SString>& vPlayerNames);
 
+    void OnWindowFocusChange(bool state) override;
+
 private:
     struct InitializeArguments
     {
diff --git a/Client/mods/deathmatch/logic/CClientGame.cpp b/Client/mods/deathmatch/logic/CClientGame.cpp
index 54c2dd8fe20..1e5a6e9fb37 100644
--- a/Client/mods/deathmatch/logic/CClientGame.cpp
+++ b/Client/mods/deathmatch/logic/CClientGame.cpp
@@ -92,6 +92,8 @@ CClientGame::CClientGame(bool bLocalPlay) : m_ServerInfo(new CServerInfo())
     m_lastWeaponSlot = WEAPONSLOT_MAX;            // last stored weapon slot, for weapon slot syncing to server (sets to invalid value)
     ResetAmmoInClip();
 
+    m_bFocused = g_pCore->IsFocused();
+
     m_bCursorEventsEnabled = false;
     m_bInitiallyFadedOut = true;
 
@@ -2565,6 +2567,7 @@ void CClientGame::AddBuiltInEvents()
     m_Events.AddEvent("onClientRender", "", NULL, false);
     m_Events.AddEvent("onClientMinimize", "", NULL, false);
     m_Events.AddEvent("onClientRestore", "", NULL, false);
+    m_Events.AddEvent("onClientMTAFocusChange", "focused", NULL, false);
 
     // Cursor events
     m_Events.AddEvent("onClientClick", "button, state, screenX, screenY, worldX, worldY, worldZ, gui_clicked", NULL, false);
@@ -6548,6 +6551,18 @@ void CClientGame::RestreamWorld()
     g_pGame->GetStreaming()->ReinitStreaming();
 }
 
+void CClientGame::OnWindowFocusChange(bool state)
+{
+    if (state == m_bFocused)
+        return;
+
+    m_bFocused = state;
+
+    CLuaArguments Arguments;
+    Arguments.PushBoolean(state);
+    m_pRootEntity->CallEvent("onClientMTAFocusChange", Arguments, false);
+}
+
 void CClientGame::InsertIFPPointerToMap(const unsigned int u32BlockNameHash, const std::shared_ptr<CClientIFP>& pIFP)
 {
     m_mapOfIfpPointers[u32BlockNameHash] = pIFP;
diff --git a/Client/mods/deathmatch/logic/CClientGame.h b/Client/mods/deathmatch/logic/CClientGame.h
index 1d76e70f112..ef2468303d1 100644
--- a/Client/mods/deathmatch/logic/CClientGame.h
+++ b/Client/mods/deathmatch/logic/CClientGame.h
@@ -256,6 +256,8 @@ class CClientGame
     void EnablePacketRecorder(const char* szFilename);
     void InitVoice(bool bEnabled, unsigned int uiServerSampleRate, unsigned char ucQuality, unsigned int uiBitrate);
 
+    bool IsWindowFocused() const { return m_bFocused; }
+
     // Accessors
 
     CVoiceRecorder*               GetVoiceRecorder() { return m_pVoiceRecorder; };
@@ -439,6 +441,8 @@ class CClientGame
     void RestreamModel(unsigned short usModel);
     void RestreamWorld();
 
+    void OnWindowFocusChange(bool state);
+
 private:
     // CGUI Callbacks
     bool OnKeyDown(CGUIKeyEventArgs Args);
@@ -773,6 +777,7 @@ class CClientGame
     bool m_bBeingDeleted;            // To enable speedy disconnect
 
     bool m_bWasMinimized;
+    bool m_bFocused;
 
     // Cache for speeding up collision processing
 public:
diff --git a/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.cpp b/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.cpp
index 044ab2e57b6..7df2d53e0ec 100644
--- a/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.cpp
+++ b/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.cpp
@@ -23,6 +23,7 @@ void CLuaClientDefs::LoadFunctions()
         {"isChatVisible", ArgumentParserWarn<false, IsChatVisible>},
         {"isChatInputBlocked", ArgumentParser<IsChatInputBlocked>},
         {"clearDebugBox", ArgumentParser<ClearDebug>},
+        {"isMTAWindowFocused", ArgumentParser<IsMTAWindowFocused>},
         {"isCapsLockEnabled", ArgumentParser<IsCapsLockEnabled>}
     };
 
@@ -72,6 +73,11 @@ bool CLuaClientDefs::ClearDebug()
     return true;
 }
 
+bool CLuaClientDefs::IsMTAWindowFocused()
+{
+    return m_pClientGame->IsWindowFocused();
+}
+
 bool CLuaClientDefs::IsCapsLockEnabled()
 {
     return ((::GetKeyState(VK_CAPITAL) & 0x0001) != 0);
diff --git a/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.h b/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.h
index 172cf53557a..7b3b276b83e 100644
--- a/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.h
+++ b/Client/mods/deathmatch/logic/luadefs/CLuaClientDefs.h
@@ -26,5 +26,6 @@ class CLuaClientDefs : public CLuaDefs
     static bool IsChatVisible();
     static bool IsChatInputBlocked();
     static bool ClearDebug();
+    static bool IsMTAWindowFocused();
     static bool IsCapsLockEnabled();
 };
diff --git a/Client/sdk/core/CClientBase.h b/Client/sdk/core/CClientBase.h
index acae1a75d18..17634dab811 100644
--- a/Client/sdk/core/CClientBase.h
+++ b/Client/sdk/core/CClientBase.h
@@ -32,4 +32,6 @@ class CClientBase
 
     virtual bool HandleException(CExceptionInformation* pExceptionInformation) = 0;
     virtual void GetPlayerNames(std::vector<SString>& vPlayerNames) = 0;
+
+    virtual void OnWindowFocusChange(bool state) = 0;
 };