Update SingleApplication to v3.5.1 version

SingleApplication/examples/windows_raise_widget/main.cpp

@@ -0,0 +1,59 @@
+
+#include <QWidget>
+
+#include "singleapplication.h"
+
+#ifdef Q_OS_WINDOWS
+#include <Windows.h>
+#endif
+
+void raiseWidget(QWidget* widget);
+
+int main(int argc, char *argv[]) {
+
+#ifdef Q_OS_WINDOWS
+    SingleApplication app(argc, argv, true);
+
+    if (app.isSecondary()) {
+
+        AllowSetForegroundWindow( DWORD( app.primaryPid() ) );
+
+        app.sendMessage("RAISE_WIDGET");
+
+        return 0;
+    }
+#else
+    SingleApplication app(argc, argv);
+#endif
+
+    QWidget* widget = new QWidget;
+
+#ifdef Q_OS_WINDOWS
+    QObject::connect(&app, &SingleApplication::receivedMessage,
+                     widget, [widget] () { raiseWidget(widget); } );
+#else
+    QObject::connect(&app, &SingleApplication::instanceStarted,
+                     widget, [widget] () { raiseWidget(widget); } );
+#endif
+
+    widget->show();
+
+    return app.exec();
+}
+
+void raiseWidget(QWidget* widget) {
+#ifdef Q_OS_WINDOWS
+    HWND hwnd = (HWND)widget->winId();
+
+    // check if widget is minimized to Windows task bar
+    if (::IsIconic(hwnd)) {
+        ::ShowWindow(hwnd, SW_RESTORE);
+    }
+
+    ::SetForegroundWindow(hwnd);
+#else
+    widget->show();
+    widget->raise();
+    widget->activateWindow();
+#endif
+}