feat(ui): handle CSimpleButton_GetButtonState script function

src/ui/CSimpleButton.cpp

@@ -83,6 +83,10 @@ void CSimpleButton::Enable(int32_t enabled) {
     }
 }
 
+CSimpleButtonState CSimpleButton::GetButtonState() {
+    return this->m_state;
+}
+
 FrameScript_Object::ScriptIx* CSimpleButton::GetScriptByName(const char* name, ScriptData& data) {
     auto parentScript = CSimpleFrame::GetScriptByName(name, data);
 

src/ui/CSimpleButton.hpp

@@ -62,6 +62,7 @@ class CSimpleButton : public CSimpleFrame {
 
         // Member functions
         CSimpleButton(CSimpleFrame* parent);
+        CSimpleButtonState GetButtonState();
         void RunOnClickScript(const char* btn, int32_t down);
         void SetClickAction(uint64_t action);
         void SetFontString(CSimpleFontString* text);

src/ui/CSimpleButtonScript.cpp

@@ -75,7 +75,24 @@ int32_t CSimpleButton_IsEnabled(lua_State* L) {
 }
 
 int32_t CSimpleButton_GetButtonState(lua_State* L) {
-    WHOA_UNIMPLEMENTED();
+    auto type = CSimpleButton::GetObjectType();
+    auto button = static_cast<CSimpleButton*>(FrameScript_GetObjectThis(L, type));
+
+    auto buttonState = button->GetButtonState();
+
+    if (buttonState == BUTTONSTATE_DISABLED) {
+        lua_pushstring(L, "DISABLED");
+        return 1;
+    } else if (buttonState == BUTTONSTATE_PUSHED) {
+        lua_pushstring(L, "PUSHED");
+        return 1;
+    } else if (buttonState == BUTTONSTATE_NORMAL) {
+        lua_pushstring(L, "NORMAL");
+        return 1;
+    }
+
+    lua_pushstring(L, "UNKNOWN");
+    return 1;
 }
 
 int32_t CSimpleButton_SetButtonState(lua_State* L) {