How to use QTableView & Model

cherple

No worries, it isn't your fault, because I tried backgroundcolorrole and it returned the same results before.

After entering ur code, this is what it looks like:
http://img.photobucket.com/albums/v483/dragonlancer/D6781CF8-2598-46CA-9290-167CB12FF98C.jpg
The code:
http://img.photobucket.com/albums/v483/dragonlancer/64707ED7-6081-466D-AE35-48263E2A959D.jpg
My table view settings:
http://img.photobucket.com/albums/v483/dragonlancer/74A8A89E-97ED-4A1F-8E68-92AF0101CFA9.jpg

alex_malyu

Could you post all code for whole model class and may be table view subclass?

As for now I can only see one potential problem -
you do not check that index passed to data is valid,
which you should do,

Code I posted works for me when my model subclass is set to QTableView.
Check if it works for you,

cpp:

#include "mymodel.h"
#include<QColor>
#include<QVariant>


MyModel::MyModel(QObject *parent)
	: QAbstractTableModel(parent)
{

}

MyModel::~MyModel()
{

}

int MyModel::rowCount ( const QModelIndex & parent ) const
{
	return 5;
}

int MyModel::columnCount ( const QModelIndex & parent ) const
{
	return 7;
}

QVariant MyModel::data ( const QModelIndex & index, int role )  const
{
	if ( index.isValid() )
	{
		if( role == Qt::DisplayRole )
		{
			QString str = QString("%1:%2").arg (index.row()).arg (index.column());
			return QVariant( str );
		}
		else if( role == Qt::BackgroundColorRole )
		{
			if( index.row() == index.column() )
				return QVariant(QColor(Qt::red));
			else if( index.row() < index.column() )
				return QVariant(QColor(Qt::yellow));
			else 
				return QVariant(QColor(Qt::green));
		}

	}
	return QVariant();
}

.h:

#pragma once

#ifndef MYMODEL_H
#define MYMODEL_H

#include <QAbstractTableModel>

class MyModel : public QAbstractTableModel
{
	Q_OBJECT

public:;
	MyModel(QObject *parent=NULL);
	~MyModel();

	int rowCount ( const QModelIndex & parent = QModelIndex() ) const;
	int columnCount ( const QModelIndex & parent = QModelIndex() ) const;
	QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const;

private:

};

#endif // MYMODEL_H

cherple

The only difference between our code is the number of row and column returned, as well as this:

MyModel::MyModel(QObject *parent)
: QAbstractTableModel(parent)
{

My code uses QWidget instead of QObject. My constructor only sets data into gridNum[r][c] which is being returned in data(). Other than that I don't see any difference.. Damn this is frustrating..

alex_malyu

Try to replace your data() , rowCount, columnCount with mine.
Did you override QTableView? If yes try to see what happens if you use QTableView class instead of your view with default options set.

cherple

I copied your code exactly and it's the same. Could the difference I. at version be the problem? I'm using Qt 4.8.1

alex_malyu

@cherple It works with Qt 4.8.6. I do not have earlier version to check .
It might be a Qt problem. But I doubt it.
Have you tried my suggestion to use my model as it is together with QTableView?
All you need on top of code above is main like:

#include "mymodel.h"
#include <QtGui/QApplication>
#include <QTableView>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	QTableView w;
    MyModel* model = new MyModel();
 	w.setModel( model );

	w.show();
	return a.exec();
}