Pass 2d array c++ to qml using GridView

arlyn123

I have a sudoku matrix in c++ code:

#include "SudokuModel.h"

SudokuModel::SudokuModel(QObject *parent) : QObject(parent)
{
    sudokuMatrix = {
        {5, 3, 0, 0, 7, 0, 0, 0, 0},
        {6, 0, 0, 1, 9, 5, 0, 0, 0},
        {0, 9, 8, 0, 0, 0, 0, 6, 0},
        {8, 0, 0, 0, 6, 0, 0, 0, 3},
        {4, 0, 0, 8, 0, 3, 0, 0, 1},
        {7, 0, 0, 0, 2, 0, 0, 0, 6},
        {0, 6, 0, 0, 0, 0, 2, 8, 0},
        {0, 0, 0, 4, 1, 9, 0, 0, 5},
        {0, 0, 0, 0, 8, 0, 0, 7, 9}
    };
}

int SudokuModel::getValue(int row, int col) const
{
    return sudokuMatrix[row][col];
}

And its header:

#ifndef SUDOKUMODEL_H
#define SUDOKUMODEL_H

#include <QObject>
#include <QList>

class SudokuModel : public QObject
{
    Q_OBJECT
public:
    explicit SudokuModel(QObject *parent = nullptr);

    Q_INVOKABLE int getValue(int row, int col) const;

private:
    QList<QList<int>> sudokuMatrix;
};

#endif

And I want to pass its values using setContextProperty in a qml GridView. How can I do that?
I also read that you can also pass a c++ 2d array to qml using QAbstractTableModel but how can I work with it? Does anyone has an example with a QAbstractTableModel?

JoeCFD

@arlyn123 you need a C++ model for gridview. for example: QAbstractTableModel
check here out:
https://forum.qt.io/topic/71629/2d-game-grid-model-from-c-to-qml

arlyn123

@JoeCFD Yes if you can, but firstly I have an error int the board.cpp that says board.cpp:36:12: Use of undeclared identifier 'qVariantFromValue'

jsulm

@arlyn123 said in Pass 2d array c++ to qml using GridView:

qVariantFromValue

It is obsolete, see https://doc.qt.io/qt-5/qvariant-obsolete.html#qVariantFromValue

arlyn123

@jsulm should I use QVariant::fromValue, right? I am a newbie to qml

jsulm

@arlyn123 Yes