How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.

[JonB]

@Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:

&& !index.parent().isValid()

Ah, well done! I kind of thought that was for a child of the root element, and the root element was that parent. But I think it makes sense, I haven't actually ever used QTreeView I don't think.

Do you mean you only want to alter presentation when multiple items are selected, not just a single one? Normally you would do colour/font via stylesheet on selected items. But that won't distinguish multiple versus single selection. QTreeView::selectionModel/selectedIndexes() gives you which items/indexes are selected, that's all I know, somehow work from there?

[Aviral 0]

@JonB I am trying this piece of code:
const bool shouldBeBold = (index.column() == 0);
if (role == Qt::FontRole && shouldBeBold) {
QFont boldFont;
boldFont.setBold(true);
return boldFont;
} else {
return DomModel::data(index, role);
}

you repied to this code in past at someone elses pproblem.
but its not working

[JonB]

@Aviral-0
Debugging techniques:

• Put a qDebug() into your if statement, does it get hit at all?
• Set shouldBeBold = true unconditionally, does any items come up in bold?
• Try, say, role == Qt::ForegroundRole and return QColor(Qt::red), does that work in case it's some bold issue?
• If you are doing this on selected items it might be that selection sets font instead, I don't know.

[Aviral 0]

@JonB Nothing worked. any other ideas?

[JonB]

@Aviral-0
If "nothing worked" that means you are saying your code is not being called at all. I cannot help if you say that is the case.

[Aviral 0]

This post is deleted!

[Aviral 0]

@JonB
Hi I solved it. I have added a function in mainwindow.cpp
view->setSelectionMode(QAbstractItemView::MultiSelection);
and I am able to select multiple items.
thankyou for your patience and help!

[Aviral 0]

Hi, Hope you are having a good day.
Now I need the checkboxes to all the parents of child.
I have attached the photo attached of what I need.
What to change in the if condition to make it happen?

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

    DomItem *item = static_cast<DomItem*>(index.internalPointer());
    const QDomNode node = item->node();

    //if ( role == Qt::CheckStateRole && !index.parent().isValid())
    //if ( role == Qt::CheckStateRole && index.column() == 0 && !index.parent().isValid())
    if ( role == Qt::CheckStateRole && index.column() == 0 && !index.parent().isValid() )
    {
        return static_cast< int >( item->isChecked() ? Qt::Checked : Qt::Unchecked );
}
    if (role != Qt::DisplayRole)
        return QVariant();

    switch (index.column()) {
        case 0:
            return node.nodeName();
        case 1:
        {
            const QDomNamedNodeMap attributeMap = node.attributes();
            QStringList attributes;
            for (int i = 0; i < attributeMap.count(); ++i) {
                QDomNode attribute = attributeMap.item(i);
                attributes << attribute.nodeName() + "=\""
                              + attribute.nodeValue() + '"';
            }
            return attributes.join(' ');
        }
        case 2:
            return node.nodeValue().split('\n').join(' ');
        default:
            break;

    }

    return item->data(index.column());
}

[JonB]

@Aviral-0
So change the && !index.parent().isValid(), which you put in to make it root-only, to whatever it is you want to show checkboxes against?

[Aviral 0]

@JonB Please look at the image I jhave attached!
Image(https://wetransfer.com/downloads/a9b408bd97b18185f4fc64ac8053fbb520221205051935/8f1754)

[JonB]

@Aviral-0
Then upload an image to your post (best, the post toolbar has "cloud" icon tooltip Upload Image), or at worst given a link to where the image can be seen. If you think I am going to download an image you want me to look at from a site , I am not.

[Aviral 0]

[JonB]

@Aviral-0
[I presume you also want a checkbox against the devices node.] So you want a checkbox against each node in the tree, but not against leaves? So check to see (in data()) whether the DomItem item for the index has any children or not.

[Aviral 0]

@JonB Yes they have childItems

[JonB]

@Aviral-0
I know! So test for that when deciding whether to request a checkbox or not, in place of your && !index.parent().isValid() which is currently restricting them to root-only node.

[Aviral 0]

@JonB
Yes, but removing that causes checkboxes at every line,
I only want at items which are root or parent to some items. Not on leafs

[JonB]

@Aviral-0
You are ignoring what I am writing. I told you how to do that, you have not acted on it.

[Aviral 0]

@JonB I have tried it bro... I tried removing !index.parent.isvalid()
and placing some other functions.
I am not fully understanding of what you are suggesting. can you tell me what to write there?

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

    DomItem *item = static_cast<DomItem*>(index.internalPointer());
    const QDomNode node = item->node();

   // if ( role == Qt::CheckStateRole && !index.parent().isValid())
    //if ( role == Qt::CheckStateRole && index.column() == 0 )
    if ( role == Qt::CheckStateRole && (index.column() == 0)  )
    {
        return static_cast< int >( item->isChecked() ? Qt::Checked : Qt::Unchecked );
}
    if (role != Qt::DisplayRole)
        return QVariant();

    switch (index.column()) {
        case 0:
            return node.nodeName();
        case 1:
        {
            const QDomNamedNodeMap attributeMap = node.attributes();
            QStringList attributes;
            for (int i = 0; i < attributeMap.count(); ++i) {
                QDomNode attribute = attributeMap.item(i);
                attributes << attribute.nodeName() + "=\""
                              + attribute.nodeValue() + '"';
            }
            return attributes.join(' ');
        }
        case 2:
            return node.nodeValue().split('\n').join(' ');
        default:
            break;

    }

    return item->data(index.column());
}


Qt::ItemFlags DomModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;

    Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsSelectable;

    if ( index.column() == 0 )
        flags |= Qt::ItemIsUserCheckable;
    return flags;
}
//! [6]

[JonB]

@Aviral-0
I am not your "bro"! You need to replace the original && !index.parent().isValid() with the condition for QDomNode node not having any children.

[Aviral 0]

@JonB You don't know anything, just arrogant rude. I didn't find any solutions to my problem from you!