Support using system titlebar in Imgui backend

backends/ui/imgui/RendererBackend.cpp

@@ -412,15 +412,24 @@ void RendererBackend::BackendInit() {
     SDL_ShowWindow(window);
     started = true;
 }
+bool RendererBackend::UsingSystemTitlebar() {
+    return enable_system_title_bar;
+}
+void RendererBackend::EnableSystemTitlebar(bool enabled) {
+    enable_system_title_bar = true;
+    SDL_SetWindowBordered(window, enable_system_title_bar ? SDL_TRUE : SDL_FALSE);
+}
 bool RendererBackend::BeginMainMenuBar() {
     main_menu_bar_used = true;
     if (ImGui::BeginMainMenuBar()) {
+        if (!enable_system_title_bar) {
             ImVec2 winsize = ImGui::GetWindowSize();
             float texsize = winsize.y;
             ImGui::SetCursorPosX(0);
             ImGui::SetCursorPosY(0);
             ImGui::Image((ImTextureID)(icon_texture), ImVec2(texsize, texsize));
             ImGui::TextUnformatted(title_text.c_str());
+        }
         menubar_start = ImGui::GetCursorPosX();
         return true;
     } else {
@@ -436,6 +445,7 @@ bool RendererBackend::is_maximized() {
 SDL_HitTestResult RendererBackend::HitTest(SDL_Window *window, const SDL_Point *area) {
 	int w, h;
 	bool rtop, rbottom, rleft, rright;
+    if (enable_system_title_bar) return SDL_HITTEST_NORMAL;
 	SDL_GetWindowSize(window, &w, &h);
 	rtop = area->y <= 4;
 	rleft = area->x <= 4;
@@ -485,6 +495,7 @@ void RendererBackend::update_real_title() {
 }
 void RendererBackend::EndMainMenuBar() {
 #ifndef __EMSCRIPTEN__
+    if (!enable_system_title_bar) {
         menubar_end = ImGui::GetCursorPosX();
         ImVec2 size = ImGui::GetWindowSize();
         if (subtitle != "") {
@@ -525,6 +536,7 @@ void RendererBackend::EndMainMenuBar() {
         if (ImGui::MenuItem(titlebar_icons[2])) {
             done = true;
         }
+    }
 #endif
     ImGui::EndMainMenuBar();
 }

backends/ui/imgui/RendererBackend.h

@@ -32,6 +32,7 @@ class RendererBackend {
     int title_btn_start;
     std::string subtitle;
     std::string title_text; 
+    bool enable_system_title_bar;
     void update_real_title();
     public:
     bool is_fullscreen();
@@ -63,6 +64,8 @@ class RendererBackend {
         SetSubtitle("");
     }
     void SetWindowTitle(const char *title);
+    bool UsingSystemTitlebar();
+    void EnableSystemTitlebar(bool enabled);
     virtual void Init();
     virtual void GuiFunction();
     virtual void Deinit();

backends/ui/imgui/main.cpp

@@ -153,6 +153,7 @@ void MainLoop::Init() {
             theme = new Theme(darkPath);
         }
     }
+    EnableSystemTitlebar(get_option<bool>("ui.imgui.enable_system_titlebar", false));
     theme->Apply(accent_color, (float)scale);
     SetWindowTitle("Looper");
     FileLoaded();
@@ -210,6 +211,29 @@ void MainLoop::FileLoaded() {
     properties = playback->get_property_list();
     boolean_properties.clear();
     double_properties.clear();
+    int_properties.clear();
+    string_properties.clear();
+    for (auto &property : properties) {
+        PropertyType type = property.type();
+        auto name = property.path();
+        auto val_maybe = playback->get_property(name);
+        if (!val_maybe.has_value()) continue;
+        auto val = val_maybe.value();
+        switch (type) {
+            case PropertyType::Int: {
+                int_properties[name] = resolve_value<int>(val);
+            } break;
+            case PropertyType::Boolean: {
+                boolean_properties[name] = resolve_value<bool>(val);
+            } break;
+            case PropertyType::String: {
+                string_properties[name] = resolve_value<std::string>(val);
+            } break;
+            case PropertyType::Double: {
+                double_properties[name] = resolve_value<double>(val);
+            } break;
+        }
+    }
 }
 void MainLoop::GuiFunction() {
 #if defined(__EMSCRIPTEN__)||defined(__ANDROID__)
@@ -573,6 +597,11 @@ void MainLoop::GuiFunction() {
             if (ImGui::Checkbox(_TR_CTX("Preference | Debug menu enable", "Enable debug menu in release builds"), &debug_mode)) {
                 set_option<bool>("ui.imgui.debug_mode", debug_mode);
             }
+            bool tmp_enable_system_title_bar = UsingSystemTitlebar();
+            if (ImGui::Checkbox(_TR_CTX("Preference | System title bar", "Enable system title bar"), &tmp_enable_system_title_bar)) {
+                EnableSystemTitlebar(tmp_enable_system_title_bar);
+                set_option<bool>("ui.imgui.enable_system_titlebar", tmp_enable_system_title_bar);
+            }
             if (ImGui::Button(_TRI_CTX(ICON_FK_MAGIC, "Preference | Related non-preference button", "Theme Editor"), ImVec2(ImGui::GetWindowWidth() - (ImGui::GetStyle().WindowPadding.x * 2.0f), 0))) {
                 theme_editor = true;
             }

backends/ui/imgui/main.h

@@ -36,7 +36,6 @@
 using namespace std::filesystem;
 using std::string;
 #define IMGUI_FRONTEND
-
 class MainLoop : public RendererBackend {
     bool show_demo_window = false;
     FileBrowser fileDialog = FileBrowser(false);