If I understand your question correctly, you want to click some button when pressing the enter key. You can just call the QAbstractButton::click()
function to perform a click.
connect(button1,SIGNAL(clicked()),this,SLOT(fileNew()));
connect(button2,SIGNAL(clicked()),this,SLOT(file())); //do this in your constructor, or somewhere else.. just make sure you only do this once
void mywindow::keyReleaseEvent(QKeyEvent *event)
{
switch(event->key())
{
case Qt::Key_Enter:
button1->click();
break;
}
}