Insert fill circle into cell of QTableWidget

[mrjj]

@juaniyoalm
Hi
Can we talk about the actual data ?
What is the data for the circle ?
you say "value of the circle"
can u specify what that means ?
The delegate has access to the cell so it can have any values at the same time.
So to avoid confusing, could you tell what data you need to paint the circle ?

[juaniyoalm]

@mrjj
Yeah, I need size array of fungivores in each cell to paint circle. This value can get it whit a method of Cell class.

The data method of model can you see above.

[mrjj]

@juaniyoalm
well just do as @SGaist suggests and the delegate can use your custom role(s)
to get the data it needs.
user roles are nothing complicated at all.
its just an id that let you assign a vlue to that id for an index.
like
model->setData(model->index(0,0), 90 , Qt::UserRole + 1 );

To avoid to ugly code and stupid mistakes, we define it as a const.
constexpr int CircleData = Qt::UserRole+1;
constexpr int SomeOtherData = Qt::UserRole+2;

and use instead of the raw value. This is a must to do. :)

[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.