I tried to override the keypressevent for my lineEdit control using eventFiltering.
but when i run my application it doesnt do anything! i even set a break point inside the eventFiltering method , but i never get there!!?
This is my source codes :
MainWindow.h
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5.  
  6. namespace Ui {
  7. class MainWindow;
  8. }
  9.  
  10. class MainWindow : public QMainWindow
  11. {
  12.     Q_OBJECT
  13.  
  14. public:
  15.     explicit MainWindow(QWidget *parent = 0);
  16.     ~MainWindow();
  17.  
  18.  
  19. protected:
  20.     bool eventFilter( QObject* sender, QEvent* event);
  21.  
  22. private:
  23.     Ui::MainWindow *ui;
  24. };
  25.  
  26. #endif // MAINWINDOW_H
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MainWindow.cpp:
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include "QMessageBox"
  4. #include <QKeyEvent>
  5. MainWindow::MainWindow(QWidget *parent) :
  6.     QMainWindow(parent),
  7.     ui(new Ui::MainWindow)
  8. {
  9.     ui->setupUi(this);
  10. }
  11.  
  12. bool MainWindow::eventFilter(QObject *sender, QEvent *event)
  13. {
  14.     if (sender == ui->lineEdit)
  15.     {
  16.         if(event->type()== QEvent::KeyPress)
  17.         {
  18.             QKeyEvent * keyEvent = (QKeyEvent*)(event);
  19.             if( keyEvent->key() == Qt::Key_Control)
  20.             {
  21.                 QMessageBox::information(this,"Salam","Test");
  22.                 return true;
  23.             }else
  24.             {
  25.                  return false;
  26.             }
  27.         }
  28.     }
  29.     return QWidget::eventFilter(sender,event);
  30. }
  31.  
  32. MainWindow::~MainWindow()
  33. {
  34.     delete ui;
  35. }
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