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The Problem: I have a custom event on QLineEdit inside a custom QComboBox and only specific events are being passed from QComboBox to QLineEdit when I want. I can't get tab to be passed.

I want when an event passed to QComboBox it will be passed to the QComboBox->lineEdit().

QCustomCombo::QCustomCombo():
 m_lineEdit(new QCustomLineEdit)

 setEditable(true);
 setLineEdit(m_lineEdit);


bool QCustomCombo::event(QEvent * event)

 if(event->type() == QEvent::KeyPress)
 
 QKeyEvent * keyEvent = static_cast<QKeyEvent *>(event);
 if(keyEvent->key() == Qt::Key_tab)
 
 //pass to lineEdit();
 //I have tried 'return true/false and QWidget::event(event)'
 //I have also tried commenting out QCustomCombo::event, same problem
 
 
 return QWidget::event(event);

QCustomLineEdit

bool QCustomLineEdit::event(QEvent * event)

 if(event->type() == QEvent::KeyPress)
 
 QKeyEvent * keyEvent = static_cast<QKeyEvent *>(event);
 if(keyEvent->key() == Qt::Key_tab)
 
 //Do custom Stuff
 return true;
 
 if(keyEvent->key() == Qt::Key_Right)
 
 //Do custom Stuff
 return true;
 
 
 return QWidget::event(event);

The QLineEdit has a custom event for left and right arrow and tab. Only the arrows get passed. But I can't get the tab to pass to it.

Use QApplication::notify

bool QCustomCombo::event(QEvent * event)

 if(event->type() == QEvent::KeyPress)
 
 QKeyEvent * keyEvent = static_cast<QKeyEvent *>(event);
 if(keyEvent->key() == Qt::Key_Tab)
 
 qApp->notify(m_lineEdit, event);
 return true;
 
 
 return QWidget::event(event);

I want when an event passed to QComboBox it will be passed to the
QComboBox->lineEdit().

installEventFilter() is your friend here. It allows object A to install an event filter on another object B, so that before object B's event(QEvent *) method gets called, object A's eventFilter(QObject *, QEvent *) method will be called first, so that object A can decide how to handle the event (and whether or not the event should be passed on to object B afterwards).

You can use that so that your CustomCombo can see and react to events that would otherwise go directly to the `QComboBox.