fix build option issues; refine cmake

examples/qt_app_server/main.cc

@@ -0,0 +1,56 @@
+#include <thread>
+
+#include <QApplication>
+
+#include "examples/qt_app_server/main_window.h"
+
+#include "webcc/logger.h"
+#include "webcc/response_builder.h"
+#include "webcc/server.h"
+#include "webcc/view.h"
+
+class ApiView : public webcc::View {
+public:
+  explicit ApiView(Context* context) : context_(context) {
+  }
+
+  webcc::ResponsePtr Handle(webcc::RequestPtr request) override {
+    if (request->method() == "GET") {
+      emit context_->SomeApiSignal("A GET request has been handled");
+      return webcc::ResponseBuilder{}.OK().Body("Hello, World!")();
+    }
+
+    return {};
+  }
+
+private:
+  Context* context_;
+};
+
+int main(int argc, char** argv) {
+  QApplication app{ argc, argv };
+
+  WEBCC_LOG_INIT("", webcc::LOG_CONSOLE);
+
+  Context context;
+
+  // Create a server and bind view.
+  webcc::Server server{ boost::asio::ip::tcp::v4(), 8000 };
+  server.Route("/", std::make_shared<ApiView>(&context));
+
+  // Run the server in a thread to avoid blocking the GUI.
+  std::thread server_thread{ [&server]() { server.Run(); } };
+
+  // Now show our Qt main window and execute the application loop.
+  MainWindow main_window{ &context };
+  main_window.resize(400, 300);
+  main_window.showNormal();
+
+  int code = app.exec();
+
+  // Stop the server and wait for it to finish.
+  server.Stop();
+  server_thread.join();
+
+  return code;
+}