Add subtitle system to imgui backend, and use it.

backends/ui/imgui/RendererBackend.cpp

@@ -17,6 +17,8 @@
 #include <log.hpp>
 #include <options.hpp>
 #include <web_functions.hpp>
+#include <fmt/core.h>
+#include <fmt/format.h>
 using std::vector;
 using namespace Looper::Options;
 void RendererBackend::on_resize() {
@@ -222,7 +224,8 @@ RendererBackend::~RendererBackend() {
     renderer_backend = nullptr;
 }
 void RendererBackend::SetWindowTitle(const char *title) {
-    SDL_SetWindowTitle(window, title);
+    this->title_text = title;
+    update_real_title();
 }
 void RendererBackend::GuiFunction() {
     // Do nothing by default.
@@ -414,12 +417,11 @@ bool RendererBackend::BeginMainMenuBar() {
     if (ImGui::BeginMainMenuBar()) {
         ImVec2 winsize = ImGui::GetWindowSize();
         float texsize = winsize.y;
-	ImGui::SetCursorPosX(0);
-	ImGui::SetCursorPosY(0);
+        ImGui::SetCursorPosX(0);
+        ImGui::SetCursorPosY(0);
         ImGui::Image((ImTextureID)(icon_texture), ImVec2(texsize, texsize));
-	//ImGui::SetCursorPosY((winsize.y - ImGui::GetFrameHeight()) / 2);
-	ImGui::TextUnformatted(SDL_GetWindowTitle(window));
-	menubar_start = ImGui::GetCursorPosX();
+        ImGui::TextUnformatted(title_text.c_str());
+        menubar_start = ImGui::GetCursorPosX();
         return true;
     } else {
         return false;
@@ -470,10 +472,28 @@ SDL_HitTestResult RendererBackend::HitTest(SDL_Window *window, const SDL_Point *
 	}
 
 }
+void RendererBackend::SetSubtitle(const char *subtitle) {
+    this->subtitle = subtitle;
+    update_real_title();
+}
+void RendererBackend::update_real_title() {
+    if (subtitle == "") {
+        SDL_SetWindowTitle(window, title_text.c_str());
+    } else {
+        SDL_SetWindowTitle(window, fmt::format("{} - {}", subtitle, title_text).c_str());
+    }
+}
 void RendererBackend::EndMainMenuBar() {
 #ifndef __EMSCRIPTEN__
     menubar_end = ImGui::GetCursorPosX();
     ImVec2 size = ImGui::GetWindowSize();
+    if (subtitle != "") {
+        ImVec4 text_color = ImGui::GetStyleColorVec4(ImGuiCol_Text);
+        text_color.w *= 0.5;
+        ImGui::PushStyleColor(ImGuiCol_Text, text_color);
+        ImGui::TextUnformatted(subtitle.c_str());
+        ImGui::PopStyleColor();
+    }
     float btnw = size.y;
     int btn_count = 3;
     ImVec2 btn_size(btnw, btnw);

backends/ui/imgui/RendererBackend.h

@@ -30,6 +30,9 @@ class RendererBackend {
     int menubar_start;
     int menubar_end;
     int title_btn_start;
+    std::string subtitle;
+    std::string title_text;
+    void update_real_title();
     public:
     bool is_fullscreen();
     bool is_maximized();
@@ -55,6 +58,10 @@ class RendererBackend {
     const char *prefPath;
     ImVec4 accent_color = ImVec4(0.75, 1.0, 1.0, 1.0);
     int Run();
+    void SetSubtitle(const char *subtitle);
+    inline void ClearSubtitle() {
+        SetSubtitle("");
+    }
     void SetWindowTitle(const char *title);
     virtual void Init();
     virtual void GuiFunction();

backends/ui/imgui/main.cpp

@@ -154,6 +154,7 @@ void MainLoop::Init() {
         }
     }
     theme->Apply(accent_color, (float)scale);
+    SetWindowTitle("Looper");
     FileLoaded();
 }
 void MainLoop::Drop(std::string file) {
@@ -201,9 +202,9 @@ void MainLoop::FileLoaded() {
     auto file_maybe = playback->get_current_title();
     if (file_maybe.has_value()) {
         auto name = file_maybe.value();
-        SetWindowTitle((name + std::string(" - Looper")).c_str());
+        SetSubtitle(name.c_str());
     } else {
-        SetWindowTitle("Looper");
+        ClearSubtitle();
     }
     streams = playback->get_streams();
     properties = playback->get_property_list();