refactor(event-handling): guard input events with imgui state

Move mouse enable/disable logic into set_imgui_enabled and check imgui_enable before forwarding non-ImGui events to handlers. This prevents duplicate processing and ensures proper mouse state when toggling ImGui.

src/app.cpp

@@ -634,7 +634,8 @@ void App::update() {
 }
 
 void App::handle_sdl_event(SDL_Event& e) {
-    if (m_window.is_enable_imgui()) {
+    bool imgui_enable = m_window.is_enable_imgui();
+    if (imgui_enable) {
         ImGui_ImplSDL3_ProcessEvent(&e);
     }
 
@@ -643,32 +644,53 @@ void App::handle_sdl_event(SDL_Event& e) {
         m_running = false;
         break;
     case SDL_EVENT_KEY_DOWN:
-    case SDL_EVENT_KEY_UP:
+        if (imgui_enable && e.key.key == SDLK_ESCAPE) {
+            m_window.set_imgui_enabled(false);
+
+        } else {
             handle_sdl_key(e);
+        }
+        break;
+    case SDL_EVENT_KEY_UP:
+        if (!imgui_enable) {
+            handle_sdl_key(e);
+        }
         break;
     case SDL_EVENT_MOUSE_BUTTON_DOWN:
     case SDL_EVENT_MOUSE_BUTTON_UP:
+        if (!imgui_enable) {
             handle_sdl_mouse_button(e);
+        }
+
         break;
     case SDL_EVENT_MOUSE_MOTION:
-        handle_mouse_move(e.motion.x, e.motion.y, e.motion.xrel, e.motion.yrel);
+        if (!imgui_enable) {
+            handle_mouse_move(e.motion.x, e.motion.y, e.motion.xrel,
+                              e.motion.yrel);
+        }
+
         break;
     case SDL_EVENT_WINDOW_RESIZED:
+
         handle_window_resize(e.window.data1, e.window.data2);
+
         break;
     case SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED:
+
         handle_framebuffer_resize(e.window.data1, e.window.data2);
+
         break;
-    case SDL_EVENT_MOUSE_WHEEL: {
+    case SDL_EVENT_MOUSE_WHEEL:
+        if (!imgui_enable) {
             float scroll_x = e.wheel.x;
             float scroll_y = e.wheel.y;
             if (e.wheel.direction == SDL_MOUSEWHEEL_FLIPPED) {
                 scroll_y = -scroll_y;
             }
             handle_mouse_scroll(scroll_x, scroll_y);
-        break;
         }
 
+        break;
     case SDL_EVENT_WINDOW_FOCUS_GAINED:
         handle_window_focus(true);
         break;
@@ -676,7 +698,10 @@ void App::handle_sdl_event(SDL_Event& e) {
         handle_window_focus(false);
         break;
     case SDL_EVENT_TEXT_INPUT:
+        if (!imgui_enable) {
             handle_text_input(e.text.text);
+        }
+
         break;
     }
 }

src/window.cpp

@@ -76,10 +76,8 @@ bool Window::handle_key_event(const KeyEvent& e) {
     if (e.key == Key::LEFT_ALT && e.action == KeyAction::PRESS) {
         if (m_game_running) {
             if (m_mouse_enable) {
-                disable_mouse();
                 set_imgui_enabled(false);
             } else {
-                enable_mouse();
                 set_imgui_enabled(true);
             }
             return true;
@@ -225,7 +223,14 @@ void Window::should_close_window() {
 
 bool Window::is_enable_imgui() const { return m_imgui_enable; }
 
-void Window::set_imgui_enabled(bool enable) { m_imgui_enable = enable; }
+void Window::set_imgui_enabled(bool enable) {
+    m_imgui_enable = enable;
+    if (!enable) {
+        disable_mouse();
+    } else {
+        enable_mouse();
+    }
+}
 
 void Window::set_vsync(bool enable) {
     if (!SDL_GL_SetSwapInterval(static_cast<int>(enable))) {