Qt - no such signal error
- by bullettime
I'm trying to trigger a signal when a double click happens in one of the draggable widgets on the fridge magnets example. Here's the changes I made to the example source:
DragLabel:
class DragLabel : public QLabel
{
public:
DragLabel(const QString &text, QWidget *parent);
QString labelText() const;
public slots:
void testSlot(){qDebug()<<"testSlot";} //<-- implemented this slot
protected:
void mouseDoubleClickEvent(QMouseEvent *ev){emit testSignal();} //<-- overriden this method
private:
QString m_labelText;
signals:
void testSignal(); //<-- added this signal
};
The only thing I changed in the implementation file is adding connect(this,SIGNAL(testSignal()),this,SLOT(testSlot())); to DragLabel's constructor.
Trying to compile the project resulted in 'undefined reference to `DragLabel::testSignal()' and 'collect2: ld returned 1 exit status' errors.
When I comment out the call to the signal, it compiles and runs, but gives off 'Object::connect: No such signal QLabel::testSignal() in draglabel.cpp' warning in the application output. Apparently testSignal() isn't being recognized as a signal.
What am I missing?
