Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3.  
  4.  
  5. MainWindow::MainWindow(QWidget *parent) :
  6.     QMainWindow(parent),
  7.     ui(new Ui::MainWindow)
  8. {
  9.     ui->setupUi(this);
  10.  
  11.  
  12.  
  13. }
  14.  
  15. MainWindow::~MainWindow()
  16. {
  17.     delete ui;
  18. }
  19. class Mouse : public QObject
  20. {
  21.     Q_OBJECT
  22.  
  23.  
  24. protected:
  25.     bool eventFilter(QObject *obj, QEvent *event);
  26. };
  27. Mouse *mouse = new Mouse();
  28. bool Mouse::eventFilter(QObject *obj, QEvent *event)
  29. {
  30.     if (event->type() == QEvent::MouseButtonPress) {
  31.  
  32.         return true;
  33.     } else {
  34.         // standard event processing
  35.         return QObject::eventFilter(obj, event);
  36.     }
  37. }
  38. QLabel*label=new QLabel();
  39. label->installEventFilter(mouse);
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I wanted to install event filter in Qlabel of my ui application ....I have posted the code above but I am having problem with it...I might be declaring the class in wrong section please help me how to install eventfilter in qlabel for mouseevent handling