/*
  Bug-Description:
    If a window has no titlebar and there is an ActiveX-Control other Widgets (e.g. QLineEdit) are not painted any more.
    However, other events (like KeyPress, ...) are handled correctly.
  
  Description:
    Small test-programm, which shows ActiveX-Control Bug.
    Steps to produce:
      1) Click "Toggle Titlebar"
      2) Enter something in the Edit-Box
        => nothing is displayed
      3) Click "Toggle Titlebar" again
        => entered text is visible
    
  Compile:
    qtBase=<path-to-qt-version-5.5.0>
    qtInclude=$qtBase/include
    qtLib=$qtBase/lib

    cl -nologo activex-bug.cc -MD \
      \
      -I$qtInclude \
      -I$qtInclude/QtGui \
      -I$qtInclude/QtCore \
      -I$qtInclude/QtWidgets \
      -I$qtInclude/QtAngle \
      -I$qtInclude/ActiveQt \
      \
      $qtLib/qtmain.lib \
      $qtLib/Qt5Core.lib \
      $qtLib/Qt5Widgets.lib \
      $qtLib/Qt5Gui.lib \
      $qtLib/Qt5AxBase.lib \
      $qtLib/Qt5AxContainer.lib \
      \
      user32.lib gdi32.lib kernel32.lib Ole32.lib OleAut32.lib -Feactivex-bug.exe
  
  Docu:
    from: http://www.qtforum.org/article/17217/error-class-qapplication-has-no-member-named-setmainwidget.html
    
    http://doc.qt.io/qt-5/activeqt-index.html
    http://www.qtforum.org/article/22777/embedding-media-player-in-qt-application.html
  
  Maybe
    QWidget::DrawChildren	0x2	If you enable this option, the widget's children are rendered recursively into the target. By default, this option is enabled.
  is switched off? (see http://doc.qt.io/qt-4.8/qwidget.html)
*/

#include <QtGui>
#include <QtCore>
#include <QLabel>
#include <QMainWindow>
#include <QApplication>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QLineEdit>
#include <QAxWidget>
#include <QPushButton>
#include <functional>
#include <iostream>

#include <QMetaEnum>
/*
std::string eventTypeToString(QEvent::Type type) {
  // from: http://stackoverflow.com/questions/22535469/how-to-get-human-readable-event-type-from-qevent
  static int eventEnumIndex = QEvent::staticMetaObject.indexOfEnumerator("Type");
  return QEvent::staticMetaObject.enumerator(eventEnumIndex).valueToKey(type);
}
*/
// ////////
class MyButton : public QPushButton {
public:
  MyButton(const QString & text, std::function<void()> _cb)
    : QPushButton(text), cb(_cb) {
    // v- https://wiki.qt.io/How_to_Use_QPushButton/de
    //  ST: works only with moc-Compiler
    //QObject::connect(this, SIGNAL(clicked()), qApp, SLOT(cb()));
  }
  
  virtual bool event(QEvent * e) override {
    if ( e->type() == QEvent::MouseButtonRelease ) {
      QMouseEvent *me = (QMouseEvent *)e;
      if ( hitButton(me->pos()) ) {
        cb();
      }
    }
//std::cout << "button event; type=" << e->type() << " " << eventTypeToString(e->type()) << "\n";
    return QPushButton::event(e);
  }
  
private:
  std::function<void()> cb;
};

// ////////
void toggleTitleBar(QWidget *widget, bool titleBar) {
  // v- stolen from: d:\Repository\WinccOA-Branch3.14\src\Exe\UiQT\Shapes\ShapeExtHdl.cxx
  QPoint p(widget->pos());
  Qt::WindowFlags flags = widget->windowFlags();

  if ( !titleBar )
  {
    // keep only "stay on top" flag
    flags &= (Qt::WindowStaysOnTopHint | Qt::WindowType_Mask);
    flags |= Qt::FramelessWindowHint;
  }
  else
  {
    // keep only "stay on top" flag
    flags &= (Qt::WindowStaysOnTopHint | Qt::WindowType_Mask);
  }

  widget->setWindowFlags(flags);
  widget->move(p);
  widget->show();
}

// ////////
int main( int argc, char **argv ) {
  QApplication app(argc,argv);
  QMainWindow win;
  bool titleBar = true;
  
  QVBoxLayout *vbox = new QVBoxLayout();
  
  // ActiveX-Control
  { QAxWidget* widget = new QAxWidget();
  
    widget->setControl("WMPlayer.OCX");
    //widget->dynamicCall("Navigate(const QString&)", QString("http://qtcentre.org"));  
    vbox->addWidget(widget);
  }
  
  // Edit+Label
  { QHBoxLayout *hbox = new QHBoxLayout();
    
    hbox->addWidget(new QLabel("edit1: ", 0));
    hbox->addWidget(new QLineEdit("abc"));

    QWidget *hboxWidget = new QWidget();
    hboxWidget->setLayout(hbox);
    vbox->addWidget(hboxWidget);
  }

  // Buttons
  { QHBoxLayout *hbox = new QHBoxLayout();

    //hbox->addWidget(new QPushButton(" Okay "));
    //hbox->addWidget(new QPushButton(" Cancel "));
    hbox->addWidget(new MyButton(" Toggle Titlebar ", [&win, &titleBar]() {
      std::cerr << "toggle title\n";
      titleBar = !titleBar;
      toggleTitleBar(&win, titleBar);
    }));
    hbox->addWidget(new MyButton(" Quit ", [&app]() {
      std::cerr << "quit pressed\n";
      app.exit();
    }));

    QWidget *hboxWidget = new QWidget();
    hboxWidget->setLayout(hbox);
    vbox->addWidget(hboxWidget);
  }

  // main
  { QWidget *vboxWidget = new QWidget();
    vboxWidget->setLayout(vbox);
    win.setCentralWidget(vboxWidget); 
  }
  win.show();
  return app.exec();
}