Insert fill circle into cell of QTableWidget

[juaniyoalm]

@mrjj
But the problem is that I don't change the value with model->setData...., as I told you, I change it with methods place in Cell class and after emit signals to notified to model and call dataChanged method...

[mrjj]

@juaniyoalm

i dont see that matters with roles.
the delegate ask model and model get from the vector/cell so
should just be fine.

[juaniyoalm]

@mrjj

I can not return a cell in the data method of the model because it gives me an error:

[mrjj]

@juaniyoalm
you try to return a Cell pointer.
Should be like
mundo->getCell(index.row(), index.column())->somePublicVariable
or
mundo->getCell(index.row(), index.column())->Func(); // return some data, int , float , etc

Why you want to return the cell pointer ?
Just return some of its data

[juaniyoalm]

@mrjj

I think I'm not understanding ... hah.

If I put the following:

When I modify the value in this method:

Or these:

That signals activate this method (slot):

But in no time I pass the role and then the model does not know what data to return...

[mrjj]

Hi
The view itself ask for
Qt::DisplayRole and Qt::EditRole ( if u edit cell )
the new roles was for the delegate to request data it needs.

You did study for more than a few minutes the
http://doc.qt.io/qt-5/model-view-programming.html
right ?

[juaniyoalm]

@mrjj

Ok, I understand now. The problems are solved:

QVariant CellModel::data(const QModelIndex &index, int role) const
{
    if(!index.isValid())
        return QVariant();

    if(index.row() >= mundo->getWorld().size() || index.row() < 0 ||
           index.column() >= mundo->getWorld()[0].size() || index.column() < 0)
        return QVariant();

    if(role == CircleSize)
    {
        return this->mundo->getCell(index.row(), index.column())->getFungivoresSize();
    }

    if(role == FoodCount)
    {
        return this->mundo->getCell(index.row(), index.column())->getFood();
    }
    return QVariant();
}

And paint method:

void CellDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    int cellValue = index.model()->data(index, Qt::UserRole+2).toInt();
    qreal circleValue = index.model()->data(index, Qt::UserRole+1).toInt();

    qreal circleRealValue = (circleValue*20)/50;

    painter->save();
    painter->fillRect(option.rect, QBrush(QColor((255 - cellValue), 255, 51)));

    painter->setBrush(Qt::blue);
    painter->drawEllipse(static_cast<QPointF>(option.rect.center()), circleRealValue, circleRealValue);
    painter->setRenderHint(QPainter::Antialiasing, true);
    painter->setPen(Qt::NoPen);

    painter->restore();
}

[mrjj]

Hi
Super.
Note you should try to reuse the CircleSize, FoodCount constexpr if possible
instead of Qt::UserRole+1.
you can just make a .h file and put them there and let both
model and delegate include it.

[juaniyoalm]

@mrjj

Ok I have already done it.

I want to thank all of you who have tried to help me, especially @mrjj and @SGaist . You have had a lot of patience with me. Thank you.

Surely I will have more questions about the project later. I'll stay here.

[mrjj]

@juaniyoalm
Well good work then. :)
Please mark as solved.
You can always make new posts
for new problems.

and happy programming.