Objects organised in a matrix

[MortyMars]

Hello everyone,

I'd like to know if it's possible to organise Widgets as elements of a matrix, by assigning them indices, row /column for example.

I have a large number of 'QTextEdit' in several of my application windows on which I'd like to run content tests. And rather than doing these tests widget by widget, I would have liked to access each of them iteratively through the code.

In fact, what I'm looking for are objects of the form object[i][j].

Is this possible?
And if so, how?

Thanks in advance.

[Pl45m4]

@MortyMars said in Objects organised in a matrix:

In fact, what I'm looking for are objects of the form object[i][j].

In general:
QVector< QVector< QTextEdit * > > m_textEditMatrix;

But there might be a better way in your use case.
If you widgets are in a layout at all time (QGridLayout for example), you can access them by row/column as well.

[MortyMars]

@Pl45m4
Thanks for your feedback

I'm glad to hear that there are one or more solutions to my problem.

However, I'm going to have to look into the solutions you suggest because, so far, I haven't managed anything, either with QVector or with QGridLayout (but I'm not very good at it...).

By any chance, do you have any more telling examples to suggest?

Thank you

[Pl45m4]

@MortyMars

What examples?
Depends on you graphical representation of your "data" and if you only store them as grid of QTextEdits or if they are really ordered like that in your GUI.

See the QGridLayout documentation

• https://doc.qt.io/qt-6/qgridlayout.html#details

@Pl45m4 said in Objects organised in a matrix:

QVector< QVector< QTextEdit * > > m_textEditMatrix;

This works when you want to store the widgets in your own structure.
So you can do something like m_textEditMatrix[i][j] or m_textEditMatrix.at(i).at(j), which is slightly better.

[MortyMars]

@Pl45m4
I'm sorry to insist, but I can't manage and I need a basic answer.

For the first solution, I created a QGridLayout called gridLtxt1 in a QMainWindow.
This contains 11 rows of 6 columns of QTextEdit.

My question is:
What is the code that allows me to modify the content of the Widget below, for example by changing its content from FALSE to TRUE?

Thanks !

[Christian Ehrlicher]

@MortyMars said in Objects organised in a matrix:

What is the code that allows me to modify the content of the Widget below, for example by changing its content from FALSE to TRUE?

ui->textEdit_15->setText("TRUE");

[MortyMars]

@Christian-Ehrlicher

Thanks for your help

But I was hoping - and this is the whole point of the initial question - to access the textEdit by a reference to its position in the grid rather than by its name, which would allow me to process iteratively rather than object by object.

If that's not possible, I admit I don't see the point of grouping Widgets in these grids... :-(

[JonB]

@MortyMars
QLayoutItem *QGridLayout::itemAtPosition(int row, int column) const
followed by
QWidget *QLayoutItem::widget() const
on the returned QLayoutItem, will give you the QTextEdit or whatever is there. Use qobject_cast<QTextEdit *>(widget) on the widget to check if it is/access it as a QTextEdit*.

[Christian Ehrlicher]

@MortyMars ... or use the apporach @Pl45m4 already wrote above and store them in your own container.

[Pl45m4]

@MortyMars said in Objects organised in a matrix:

to access the textEdit by a reference to its position in the grid rather than by its name, which would allow me to process iteratively rather than object by object.

Put your QTextEdits in a container like:

@Pl45m4 said in Objects organised in a matrix:

QVector< QVector< QTextEdit * > > m_textEditMatrix;

Either you take them from your Designer file and add them in your code.
Or you code your QTextEdits directly and add them to your layout also by code.

QVector< QVector< QTextEdit * > > m_textEditMatrix;
QTextEdit * edit_0_0 = new QTextEdit(this);
QTextEdit * edit_0_1 = new QTextEdit(this);
QTextEdit * edit_0_2 = new QTextEdit(this);
QTextEdit * edit_1_0 = new QTextEdit(this);
QTextEdit * edit_1_1 = new QTextEdit(this);
QTextEdit * edit_1_2 = new QTextEdit(this);

// Add a loop that fills your matrix
QVector<QTextEdit*> tmpRow;
tmpRow.push_back(edit_0_0);
tmpRow.push_back(edit_0_1);
tmpRow.push_back(edit_0_2);
m_textEditMatrix.push_back(tmpRow);

// test with:
int row, col;
row = 0;
col = 1;
m_textEditMatrix.at(row).at(col)->setText("True");

[JonB]

@MortyMars
...Or :) ... If you all want to do is iterate the QTextEdits, not know/care which one is which (e.g. you're setting some attribute on them all)

QList<QTextEdit *> allTextEdits = parentWidget.findChildren<QTextEdit *>();
```

[MortyMars]

@Pl45m4 said in Objects organised in a matrix:

@Pl45m4 @Christian-Ehrlicher @JonB :
Thank you all for trying to help me, especially as I'm clearly not at the right level to understand everything instantly, but I'll keep at it, I promise.

Either you take them from your Designer file and add them in your code.

How can I get the QTextEdit from my form?

[JonB]

@MortyMars

How can I get the QTextEdit from my form?

When you use Designer all the widgets you create and name go into ui->, e.g. ui->textEdit1.

[Pl45m4]

@MortyMars said in Objects organised in a matrix:

How can I get the QTextEdit from my form?

In your mainWindow with

ui->objectname
(the name you see in QtDesigner, like textEdit_10).
I recommend to rename them, so you know what widget is where.

[MortyMars]

@Pl45m4
Here's the code I've come up with.
The compilation runs smoothly, but I can't see any changes to the content of the QTextEdit in my form...

`QVector< QVector< QTextEdit* >> m_textEditMatrix;
    ui->edit_0_0 = new QTextEdit(this);
    ui->edit_0_1 = new QTextEdit(this);
    ui->edit_0_2 = new QTextEdit(this);
    ui->edit_0_3 = new QTextEdit(this);
    ui->edit_0_4 = new QTextEdit(this);
    ui->edit_0_5 = new QTextEdit(this);

    // Add a loop that fills your matrix
    QVector<QTextEdit*> tmpRow;
    tmpRow.push_back(ui->edit_0_0);
    tmpRow.push_back(ui->edit_0_1);
    tmpRow.push_back(ui->edit_0_2);
    tmpRow.push_back(ui->edit_0_3);
    tmpRow.push_back(ui->edit_0_4);
    tmpRow.push_back(ui->edit_0_5);


    m_textEditMatrix.push_back(tmpRow);

    // test with:
    //int row, col;
    //row = 0;
    //col = 0;
    m_textEditMatrix.at(0).at(0)->setText("True");
    m_textEditMatrix.at(0).at(1)->setText("True");
    m_textEditMatrix.at(0).at(2)->setText("True");
    m_textEditMatrix.at(0).at(3)->setText("True");
    m_textEditMatrix.at(0).at(4)->setText("True");
    m_textEditMatrix.at(0).at(5)->setText("True");>
``

[Christian Ehrlicher]

@MortyMars said in Objects organised in a matrix:

ui->edit_0_0 = new QTextEdit(this);
ui->edit_0_1 = new QTextEdit(this);
ui->edit_0_2 = new QTextEdit(this);
ui->edit_0_3 = new QTextEdit(this);
ui->edit_0_4 = new QTextEdit(this);
ui->edit_0_5 = new QTextEdit(this);

Why? They are already created within ui.setupUi().

[MortyMars]

@Christian-Ehrlicher,

I confess, I've stupidly copied and adapted the code provided for objects that don't yet exist.
By commenting out the unnecessary lines, IT WORKS !

Thank you all very much for your support and patience, I'll be able to move forward, and if I need to I'll know where to find you :-)