add an example to embed a server in a Qt GUI app

examples/qt_app_server/main_window.h

@@ -0,0 +1,34 @@
+#ifndef MAIN_WINDOW_H_
+#define MAIN_WINDOW_H_
+
+#include <QMainWindow>
+
+// Some global QObject with public signals for ApiView to inform the handling
+// of client requests.
+// "Context" is a bad name, you should change it.
+class Context : public QObject {
+  Q_OBJECT
+
+public:
+  explicit Context(QObject* parent = nullptr) : QObject(parent) {
+  }
+
+  // Public signals emitted from ApiView:
+signals:
+  void SomeApiSignal(const QString& text);
+  // Add other signals here...
+};
+
+class MainWindow : public QMainWindow {
+  Q_OBJECT
+
+public:
+  explicit MainWindow(Context* context, QWidget* parent = nullptr);
+
+private:
+  // You should encapsulate the required information as the signal parameters.
+  // I use QString just for demostrating how to transfer data from ApiView.
+  void OnSomeApiSignal(const QString& text);
+};
+
+#endif  // MAIN_WINDOW_H_