双击一个 QLineEdit 为什么会产生一个 QEvent：KeyPress

双击一个 QLineEdit 为什么会产生一个 QEvent：KeyPress

qt 4.7.1

#include
#include

#include
#include

class HotkeyEdit: public QLineEdit
{
Q_OBJECT
public:
HotkeyEdit(QWidget *parent=0);
void mouseDoubleClickEvent ( QMouseEvent * event );
void keyPressEvent ( QKeyEvent * event );
};

HotkeyEdit::HotkeyEdit(QWidget *parent):QLineEdit(parent)
{
}

void HotkeyEdit::mouseDoubleClickEvent ( QMouseEvent * event ){
qDebug() << "HotkeyEdit::mouseDoubleClickEvent";
event->ignore();
}

void HotkeyEdit::keyPressEvent ( QKeyEvent * event )
{
QKeySequence keySeq(event->modifiers() + event->key());
int keyCode=event->key();
if( (keyCode==Qt::Key_Control) || (keyCode==Qt::Key_Alt) || (keyCode==Qt::Key_Shift) || (keyCode==Qt::Key_Meta))
{
qDebug() << "keyCode:" << keySeq.toString() << event->key();
}else
{
qDebug() << "KeyPress:" << keySeq.toString() << event->key();
setText(keySeq.toString());
}
}

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
HotkeyEdit w;
w.show();

return a.exec();
}

#include "main.moc"

不明白啊 = =！

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