one model for several viewings

[wysota]

I didn't say to modify the code, but to understand it. At least one of the examples provided uses custom roles.

I can't write the complete code for you - you won't learn this way. Besides, I have given you an almost complete solution using QStandardItemModel, what more do you need?

[someralex]

I really can't figure it out. The deadline is coming, and I still don't get it. And it is always easier to understand something using the example. If you can, just provide the approximate code, so I could get it clear. I really need it. I'd be very grateful.
Thank you in advance.

[wysota]

What's wrong with my example a few posts earlier? Or with the one before? If you assemble them both, you get a complete solution for your problem. The first example shows you how to retrieve data from the standard item model and the last shows how to add data to the model. What more do you need? Just wrap the methods I have written into a complete class and you're ready to go.

[someralex]

I have figured everything out! Thanks so much.
I just read it through, studied the code, read the assistent and got it all clear.
I have done the following methods:

QModelIndex myModel::addFolder(const QDir &foldername){
  int row = rowCount(); // number of folders already in the model
  insertRow(row); // add a new row
  QModelIndex ind = index(row, 0); // index of the newly created item
  insertColumn(0, ind); // add a column for future children of the item
  setData(ind, foldername.dirName(), Qt::DisplayRole);
  return ind;
}
 
QModelIndex myModel::addFile(const QModelIndex &parent, const QFileInfo &file){
  int row = rowCount(parent); // get number of files
  insertRow(row, parent); // insert new file
  QModelIndex ind = index(row, 0, parent); // get index
  setData(ind, file.completeBaseName(), Qt::DisplayRole); // insert filename in
  setData(ind, file.absoluteFilePath(), Qt::UserRole); // insert full path in Qt
  return ind;
}
QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::UserRole+1);
  return parent;
}

QModelIndex myModel::addFolder(const QDir &foldername){
  int row = rowCount(); // number of folders already in the model
  insertRow(row); // add a new row
  QModelIndex ind = index(row, 0); // index of the newly created item
  insertColumn(0, ind); // add a column for future children of the item
  setData(ind, foldername.dirName(), Qt::DisplayRole);
  return ind;
}

QModelIndex myModel::addFile(const QModelIndex &parent, const QFileInfo &file){
  int row = rowCount(parent); // get number of files
  insertRow(row, parent); // insert new file
  QModelIndex ind = index(row, 0, parent); // get index
  setData(ind, file.completeBaseName(), Qt::DisplayRole); // insert filename in
  setData(ind, file.absoluteFilePath(), Qt::UserRole); // insert full path in Qt
  return ind;
}
QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::UserRole+1);
  return parent;
}

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void MainWindow::changeItemInLV2(const QModelIndex &myIndex){
     imageLabel->setText(myIndex.sibling(myIndex.row(),0).data(Qt::UserRole).toString());
}

void MainWindow::changeItemInLV2(const QModelIndex &myIndex){
     imageLabel->setText(myIndex.sibling(myIndex.row(),0).data(Qt::UserRole).toString());
}

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And how to create a method to get an image from Qt::UserRole+1 I can't understand.
QVariant doesn't have toPixmap method.
I'm asking for your help. again.

[wysota]

And how to create a method to get an image from Qt::UserRole+1 I can't understand.
QVariant doesn't have toPixmap method.

QPixmap pix = qvariant_cast<QPixmap>(data(index, ImageRole));

QPixmap pix = qvariant_cast<QPixmap>(data(index, ImageRole));

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[someralex]

QPixmap pix = qvariant_cast<QPixmap>(data(index, ImageRole));

void MainWindow::changLV1Item(const QModelIndex &fld){
     lv2->setRootIndex(fld);
     imageLabel->setPixmap(qvariant_cast<QPixmap>(fld.sibling(fld.row(),0).data(Qt::UserRole+1)));
}

void MainWindow::changLV1Item(const QModelIndex &fld){
     lv2->setRootIndex(fld);
     imageLabel->setPixmap(qvariant_cast<QPixmap>(fld.sibling(fld.row(),0).data(Qt::UserRole+1)));
}

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However, it doesn't return anything - QPixmap doesn't return from the model. I think the problem is in Qt::UserRole+1. In my previous post I have written how I fill the model with images. Am I doing something wrong?

[wysota]

QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::UserRole+1);
  return parent;
}

QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::UserRole+1);
  return parent;
}

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Here you add the image to the "parent". Maybe you're simply using a wrong index? Try using Qt:ecorationRole instead of Qt::UserRole+1 and display the model in QTableView or QTreeView. The pixmap should be there. If it's not, then maybe the pixmap is invalid?

[someralex]

QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::DecorationRole);
  return parent;
}

QModelIndex myModel::addImage(const QModelIndex &parent, const QPixmap &image){
  setData(parent, image, Qt::DecorationRole);
  return parent;
}

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Qt:ecorationRole doesn't work also

QPixmap works. The code below displays the image:

imageLabel = new QLabel;
    imageLabel->setPixmap(QPixmap("/docs/doc_1/1.BMP"));

imageLabel = new QLabel;
    imageLabel->setPixmap(QPixmap("/docs/doc_1/1.BMP"));

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[someralex]

Everything went well! It works. I had a little mistake in my code. Qt::UseRole+1 works. I'm really grateful for your help. Many thanks.