Solved Insert fill circle into cell of QTableWidget

[SGaist]

Is the matrix a two dimensional table ?

[juaniyoalm]

@SGaist
Yes, in each cell there is fungus (int value) and fungivores (array of fungivores).

I've tried pass QPair or Qlist to QStandarItemModel but is not posible cast to qvariant

[SGaist]

What are you currently using to store that "matrix" ?

[juaniyoalm]

Vector<Vector<Cell>>

[juaniyoalm]

Some answer please???

[SGaist]

Please show some patience and allow 24 hours to run before bumping your own thread. This is a community forum where people answer on their own time. They might not even live in the same timezone as you.

As for your current trouble. You can build a QAbstractTableModel that will give access to your matrix. For the specific members of your Cell class, you can use custom roles.

[juaniyoalm]

@SGaist

I'm sorry, it was my vacation day and I wanted to move forward with the project. I'm sorry.

To assign the matrix to the model simply the model creates a variable of the same type as the matrix and initialize the model I assign it in some way, is it correct? I do not understand the roles very well ...

[SGaist]

You should also provide APIs that will allow you ton modify that matrix.

As for the roles, they are there to retrieve specific information from the model's elements.

[juaniyoalm]

@SGaist said in Insert fill circle into cell of QTableWidget:

You should also provide APIs that will allow you ton modify that matrix.
As for the roles, they are there to retrieve specific information from the model's elements.

I'm sorry but I still do not understand well the models and roles in QT.
Can anyone give me an example of how the model class should be?

I have a matrix (vector <vector <Cell >>) and when modifying some attributes of the Cell class, have to change what is painted in the graphic representation (Only the one in the cell corresponding to the coordinates of the matrix).

[mrjj]

@juaniyoalm
Hi
Its something like this
https://meetingcpp.com/blog/items/an-introduction-into-qt-part-3.html
However he uses a
std::vector<PersonalData> mydata;
where you have
vector <vector <Cell >>
so you need to use both index.row and index.col
to address your matrix. ( the data)

[juaniyoalm]

@mrjj Thanks so much.

I was doing it that way, but how did I assign the matrix to the model variable? At this moment, I am creating the matrix in mainwindow class ...

[mrjj]

@juaniyoalm
Hi
well the vector <vector <Cell >> matrix could be inside the model
and you would use method like the Addperson in sample to fill it.
Much like you do now. when maxtrix is outside of the model.
You could also fill it in mainwindow and simply give whole matrix to model
to copy it to internal variable.(matrix) but thats a bit waste full.

Also i been wanting to ask you. You do use a TableView because you need scrolling correct?
I mean there are far more rows with cells than can fit on on screen ?

[juaniyoalm]

@mrjj

Yes, there is no row limit, it can be 20 rows, 100 or 1000 xD. I always have to think about what I do to behave well when I do the parallel implementation, using pthread and openmp.

[mrjj]

@juaniyoalm
Ok so scrolling is needed:)
Also make sure to check out QtConcurrent and QThread before jumping to pthread.

[juaniyoalm]

@mrjj

ok, I will look it.

I have a doubt, when I modify a value of the Cell class (this is done in a method of the Cell class ), it will be modified automatically in the model or I have to do model-> setData (model-> index (i, j) , matrix [i] [j] -> getModifiedValue ())? The Cell of matrix are pointer...

[mrjj]

@juaniyoalm
Well if you go with QAbstractTableModel
your matrix IS the data so if you modify it
and call dataChanged (model call ) to let view know data has been altered.

[juaniyoalm]

@mrjj

ok, this is my model implementation:

/#include "cellmodel.h"

CellModel::CellModel(QObject *parent) : QAbstractTableModel(parent){}
CellModel::CellModel(int rows, int columns, int fungivores)
{
    this->mundo = new World(rows, columns, fungivores);
}

int CellModel::rowCount(const QModelIndex &parent) const
{
    return this->mundo->world.size();
}
int CellModel::columnCount(const QModelIndex &parent) const
{
    return this->mundo->world[0].size();
}

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

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

    if(role == Qt::DisplayRole || role == Qt::EditRole)
    {
        return this->mundo->world[index.row()][index.column()]->getFood();
    }
    return QVariant();
}

bool CellModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (index.isValid() && role == Qt::EditRole && !(index.row() >= this->mundo->world.size() || index.row() < 0 ||
                                                     index.column() >= this->mundo->world[0].size() || index.column() < 0))
    {
        int row = index.row();
        int col = index.column();

        this->mundo->world[row][col]->setFood(value.toInt());

        emit dataChanged(index, index);
        return true;
    }
    return false;
}

Qt::ItemFlags CellModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::ItemIsEnabled;
    return QAbstractTableModel::flags(index) | Qt::ItemIsEditable;
}

if I modify the value in this way: model-> world-> world [0] [0] -> setFood (200);

1- All row is changed instead of just the selected cell.

2 - Repaint all matrix, although the data of the others have not changed.

[mrjj]

hi
If you place break point and check
CellModel::data
return this->mundo->world[index.row()][index.column()]->getFood();
is row and index what you expect and does getFood() return different values?

it looks ok.
very much like
http://doc.qt.io/qt-5/qtwidgets-itemviews-addressbook-tablemodel-cpp.html

[juaniyoalm]

@mrjj Hi!!

In the variable index I get the whole world object (contains the matrix). Attached image:

I think the problem is in the setData method because if I delete the content of this method (I only leave the return false) the behavior does not change, that is, it continues to paint all row instead of just the one that has been modified.

EDIT:

When I modify the value with the setValue method of the Cell class, it does not pass through the setData method.

[mrjj]

@juaniyoalm
Hi
is index.row / col always 0,0 ?
you can use QDebug to easy see it
while running.