#include <QApplication>
#include <QPushButton>
#include <QMainWindow>
#include <iostream>
#include <QMouseEvent>
#include <QMenu>


class CustomPushButton : public QPushButton
{
   Q_OBJECT

public:
   CustomPushButton(QWidget* pParent = nullptr)
      : QPushButton(pParent)
   {
      // Accept touch events to give visual feedback ob touch begin
      setAttribute(Qt::WA_AcceptTouchEvents);
   }

   bool event(QEvent* e)
   {
      if (e->type() == QEvent::MouseButtonPress)
      {
         std::cout << "PushButton MousePress - Source: " << dynamic_cast<QMouseEvent*>(e)->source() << std::endl;
         setText("pressed");
      }
      else if (e->type() == QEvent::TouchBegin)
      {
         std::cout << "PushButton TouchBeginn" << std::endl;
      }
      else if (e->type() == QEvent::TouchCancel)
      {
         std::cout << "PushButton TouchCancel" << std::endl;
      }
      else if (e->type() == QEvent::TouchEnd)
      {
         std::cout << "PushButton TouchEnd" << std::endl;
      }
      else if (e->type() == QEvent::MouseButtonRelease)
      {
         std::cout << "PushButton MouseRelease - Source: " << dynamic_cast<QMouseEvent*>(e)->source() << std::endl;
         setText("pushMe");
      }
      else if (e->type() == QEvent::MouseMove)
      {
         std::cout << "PushButton MouseMove" << std::endl;
      }
      return QPushButton::event(e);
   }
};

class CustomWidget : public QWidget
{

public:
   CustomWidget(QWidget* parent) :QWidget(parent)
   {
      setAttribute(Qt::WA_AcceptTouchEvents);
   }

   bool event(QEvent* e)
   {
      if (e->type() == QEvent::MouseButtonPress)
      {
         std::cout << "CustomWidget MousePress" << std::endl;
         QPalette pal = QPalette();
         pal.setColor(QPalette::Window, Qt::green);
         setPalette(pal);
      }
      else if (e->type() == QEvent::TouchBegin)
      {
         std::cout << "CustomWidget TouchBeginn" << std::endl;
      }
      else if (e->type() == QEvent::TouchCancel)
      {
         std::cout << "CustomWidget TouchCancel" << std::endl;
      }
      else if (e->type() == QEvent::TouchEnd)
      {
         std::cout << "CustomWidget TouchEnd" << std::endl;
      }
      else if (e->type() == QEvent::MouseButtonRelease)
      {
         std::cout << "CustomWidget MouseRelease" << std::endl;
         QPalette pal = QPalette();
         pal.setColor(QPalette::Window, Qt::red);
         setPalette(pal);
      }
      else if (e->type() == QEvent::MouseMove)
      {
         std::cout << "CustomWidget MouseMove" << std::endl;
      }
      return QWidget::event(e);
   }
};

class CustomEventFilter : public QObject
{
   bool eventFilter(QObject* obj, QEvent* e) override
   {
      if (e->type() == QEvent::MouseButtonPress)
      {
         std::cout << "Filter MousePress" << std::endl;
      }
      else if (e->type() == QEvent::TouchBegin)
      {
         std::cout << "Filter TouchBeginn" << std::endl;
      }
      else if (e->type() == QEvent::TouchCancel)
      {
         std::cout << "Filter TouchCancel" << std::endl;
      }
      else if (e->type() == QEvent::TouchEnd)
      {
         std::cout << "Filter TouchEnd" << std::endl;
      }
      else if (e->type() == QEvent::MouseButtonRelease)
      {
         std::cout << "Filter MouseRelease" << std::endl;
      }
      return false;
   }
};

int main(int argc, char* argv[])
{
   QCoreApplication::setOrganizationName("QtExamples");
   QApplication app(argc, argv);
   CustomEventFilter filter;
   app.installEventFilter(&filter);
   QMainWindow* mainWindow = new QMainWindow();

   //Create Parent Widget
   CustomWidget* customWidget = new CustomWidget(mainWindow);
   customWidget->setGeometry(10, 10, 300, 300);
   QPalette pal = QPalette();
   pal.setColor(QPalette::Window, Qt::green);
   customWidget->setAutoFillBackground(true);
   customWidget->setPalette(pal);

   QMenu* menu = new QMenu("MyMenu", customWidget);
   menu->addAction("Action1");
   menu->addAction("Action2");

   // Button to open the popup / menu
   QPushButton* button = new QPushButton(customWidget);
   button->setText("menu");
   button->setMenu(menu);

   // Button which stays "down" - only mousepress is arrived
   CustomPushButton* testButton = new CustomPushButton(customWidget);
   testButton->setText("pushMe");
   testButton->move(150, 60);

   mainWindow->show();
   return app.exec();
}
#include "qtDemo.moc"