FTXUI Render Thread Example

main.cpp

// This code is from the Datarazer project. You may find more info here: https://wiltech.org/datarazer
// This code also to be used as an example for threaded rendering with FXTUI: https://github.com/ArthurSonzogni/FTXUI

int main() {
    // ...
    Element current_render = text("Loading application...");
    
    // Initialize renderer
    std::mutex render_mtx;
    std::mutex event_mtx;
    auto component = Renderer([&] {
        std::lock_guard<std::mutex> lock(render_mtx);
        return current_render;
    });

    // Setup event handling buffer to be executed on 2nd thread
    std::vector<Event> event_buffer;
    component |= CatchEvent([&](Event event) {
        if (event.is_cursor_reporting()) {
            return false;
        }
        {
            std::lock_guard<std::mutex> lock(event_mtx);
            event_buffer.push_back(event);
        }
        return true;
    });
    application_thread_running = true;
    std::thread application_thread([&] {
        // Initialize main classes
        auto vc = new ViewWindowController();
        auto dc = new DiskController();

        auto mwin = std::shared_ptr<MainWindow>(new MainWindow(vc, dc));
        vc->AddWindow(mwin);
        vc->SetActiveWindow(0);
        
        // View Components
        while (application_thread_running) {
            // Build render buffer
            auto new_frame = vc->Render();
            {
                std::lock_guard<std::mutex> lock(render_mtx);
                current_render = new_frame;
            }

            // Handle events this frame
            {
                std::lock_guard<std::mutex> lock(event_mtx);
                while (event_buffer.size() != 0) {
                    auto event = *(event_buffer.begin());
                    vc->OnUserInput(event);
                    event_buffer.erase(event_buffer.begin());
                }
            }

            // Force FTXUI to refresh the frame
            screen.Post(Event::Custom);
            std::this_thread::sleep_for(0.001s);
        }
        // stop application
        delete vc;
        delete dc;
    }
    
    // Start FTXUI on the main thread
    screen.Loop(component);
    
    exit(EXIT_SUCCESS);
}