Error when inherit from QQuickGridView

[zeangel]

I want to override the function of keyPreesEvent of QQuickGridView, so I created an class inherit from QQuickGridView, but the link failed.
Anybody who can help?

#ifndef BASEGRIDVIEW_P_H
#define BASEGRIDVIEW_P_H

#include <QObject>
#include <QtQuick/private/qquickgridview_p.h>

class BaseGridView : public QQuickGridView
{
Q_OBJECT
// Q_INTERFACES(QQmlParserStatus)

public:
explicit BaseGridView(QQuickItem * parent = Q_NULLPTR): QQuickGridView(parent)
{

}

//protected:
// void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;

// Q_DISABLE_COPY(BaseGridView)
};

#endif // BASEGRIDVIEW_P_H

I got these link errors:

./debug/moc_basegridview_p.cpp:79: undefined reference to QQuickGridView::qt_metacast(char const*)' ./debug/moc_basegridview_p.cpp:84: undefined reference to QQuickGridView::qt_metacall(QMetaObject::Call, int, void**)'
./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata+0x4): undefined reference to QQuickGridView::staticMetaObject' ./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata$_ZTV12BaseGridView[__ZTV12BaseGridView]+0x5c): undefined reference to QQuickGridView::keyPressEvent(QKeyEvent*)'
./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata$_ZTV12BaseGridView[__ZTV12BaseGridView]+0xb4): undefined reference to QQuickGridView::geometryChanged(QRectF const&, QRectF const&)' ./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata$_ZTV12BaseGridView[__ZTV12BaseGridView]+0xe4): undefined reference to QQuickGridView::viewportMoved(QFlagsQt::Orientation)'
./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata$_ZTV12BaseGridView[__ZTV12BaseGridView]+0xe8): undefined reference to QQuickGridView::setHighlightFollowsCurrentItem(bool)' ./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata$_ZTV12BaseGridView[__ZTV12BaseGridView]+0xec): undefined reference to QQuickGridView::setHighlightMoveDuration(int)'
./debug\moc_basegridview_p.o:moc_basegridview_p.cpp:(.rdata$_ZTV12BaseGridView[__ZTV12BaseGridView]+0xf0): undefined reference to QQuickGridView::initItem(int, QObject*)' /plugin/basegridview_p.h:9: undefined reference to QQuickGridView::~QQuickGridView()'

In my pro file, I already added this:
QT += core qml quick
QT += core-private gui-private qml-private quick-private

BTW, when I inherit from QQuickFlickable, there is no link error.

I'm using Qt5.6.0

[p3c0]

@zeangel I'm not aware of the error( may be you are missing some header files ?) but why would you want to subclass private classes ? Chances are that the code changes with each new releases.
I think you should have a look at Keys QML Type.