QFileSystemModel/TreeView - issues

jacob.n

Here, constructor and desctructor

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}

JonB

@jacob-n
OK, but that MainWindow::~MainWindow() was not in what you posted earlier, was it? Given that, if you recompile now you should not get the undefined reference to MainWindow::~MainWindow() error that you showed earlier?

jacob.n

Yeah, fixed that one. Thank you!
Can you please help with next issue, I found how to save data to kind of table and output.
Please advise alternative way to output data from array without saving into temporary table.
#include "Dialog.h"
#include "ui_Dialog.h"

Dialog::Dialog(QWidget *parent)
: QDialog(parent)
, ui(new Ui::Dialog)
{
ui->setupUi(this);

model = new QStandardItemModel(5,2, this);

ui->tableView->setModel(model);
QModelIndex index;

for (int row = 0; row < model->rowCount(); ++row)
{
   for (int col = 0; col < model ->columnCount(); ++col)
   {
      index = model->index (row,col);
      model->setData(index,9);
   }

}

}

Dialog::~Dialog()
{
delete ui;
}

Thanks in advance,
Jacob N

JonB

@jacob-n
Your code just shows putting some data into the model. I don't know what you mean by "output data" and where a "temporary table" is involved.

If you mean you don't need/want the data storage provided by a QStandardItemModel, e.g. you have your own data in an array, look at QAbstractTableModel Class and the Subclassing section instead. All you have to do is

When subclassing QAbstractTableModel, you must implement rowCount(), columnCount(), and data().

Just tie those to your array.

Editable models need to implement setData(), and implement flags() to return a value containing Qt::ItemIsEditable.

And implement setData() to write into your array.

Once you have that you can replace the QStandardItemModel with it and the QTableView will work the same but use your array as the model.

jacob.n

Hello there!

qDebug() << ui->tableView->model()->index(0,0).data();
outputting to console this:
QVariant(int, 1)
I just need to return to function this int value.

like
return ui->tableView->model()->index(0,0).data();
return tableView.getData(something);

What is the proper syntax ?

BR

Jacob

jsulm

@jacob-n said in QFileSystemModel/TreeView - issues:

I just need to return to function this int value

https://doc.qt.io/qt-5/qvariant.html#toInt

icebergenergy

This post is deleted!

jacob.n

is there a way to convert from QVariant to std string?

Christian Ehrlicher

@jacob-n said in QFileSystemModel/TreeView - issues:

is there a way to convert from QVariant to std string?

Convert it to a QString and then to a std::string.

jacob.n

done! Thank you!
How do you guys make back up with QT?
If I just copy folder and trying to open project from new folder it will not build good.
Please advise

jsulm

@jacob-n said in QFileSystemModel/TreeView - issues:

How do you guys make back up with QT?

Using a proper code version system like Git.

"If I just copy folder and trying to open project from new folder it will not build good." - what exactly happens? You probably need to delete the *.pro.user file.