Error calling base class's 'paint' method.

litearc

I'm subclassing QAbstractItemDelegate to display certain data differently, but for text data, I simply want to print it normally, so I'm trying to call the base class's paint method:

@
void Prop_Delegate::paint(QPainter *painter, const QStyleOptionViewItem &style, const QModelIndex &idx) const {
QAbstractItemDelegate::paint(painter, style, idx);
}
@

However, this gives the error: Undefined symbols for architecture x86_64. Can someone please tell me what is wrong? I included QAbstractItemDelegate in the header, and calling QAbstractItemDelegate::parent() doesn't raise any error. Here is the complete source:

prop_delegate.h
@
#ifndef PROP_DELEGATE_H
#define PROP_DELEGATE_H

#include <QAbstractItemDelegate>

class Prop_Delegate : public QAbstractItemDelegate {
Q_OBJECT

public:
Prop_Delegate(QObject *p = 0) : QAbstractItemDelegate(p) {};

// necessary overloaded methods.                                                                                                        
void paint(QPainter *, const QStyleOptionViewItem &, const QModelIndex &) const;                                                        
QSize sizeHint(const QStyleOptionViewItem &, const QModelIndex &) const;

};

#endif
@

prop_delegate.cpp
@
#include "prop_delegate.h"
#include "tile.h"

#include <QPainter>
#include <QSize>

void Prop_Delegate::paint(QPainter *painter, const QStyleOptionViewItem &style, const QModelIndex &idx) const {
switch (idx.column()){
case 0:
painter->save();
if (idx.model()->data(idx, Qt::DisplayRole).toBool())
painter->fillRect(style.rect, style.palette.highlight());
painter->restore();
break;
case 1:
QAbstractItemDelegate::paint(painter, style, idx);
break;
}
}

QSize Prop_Delegate::sizeHint(const QStyleOptionViewItem &, const QModelIndex &) const {
return QSize(21, 100);
}
@

Thanks!

SGaist

Hi and welcome to devnet,

Basic checks:

Which version of Qt are you using ? If Qt 5, did you add

@QT += widgets@

to your pro file ?

If so, are you building in 32bit mode and linking to a 64bit Qt ?

litearc

Sorry, yes I'm using Qt 5.2 (the error was also there in 5.1). I did add "QT += widgets" in my pro file. I'm not sure about what mode I'm building in or linking in. I just type 'make' in the terminal. So far, I haven't gotten any problems. Is there any way to force it to build and compile in the same mode? Thanks.

Chris Kawa

The word abstract in QAbstractItemDelegate is not random :) This is an abstract class and paint() is a pure virtual method so you can't call it.

SGaist

Shame on me… Too used to QStyledItemDelegate… Which you should use by the way