How to call a function by hovering over a TreeView's item?

[SRaD]

Using Qt5, I've got a QTreeView and a model that inherits from QAbstractItemModel similar to the following:

`- Root
   |- System1
   |   |- subsystem1
   |   `- subsystem2
   `- System2
       |- subsystem3   
       `- subsystem4   

What I'm looking to do is call a function as the mouse hovers over one of the subsystem item's in the TreeView's row and even change the color of the row's text. I need to do this without clicking on the item, just a mouse-over hover.

Any help much appreciated.

[JonB]

@SRaD
You do this at the view side, QTreeView and the QAbstractItemView it inherits from. There are a couple of approaches, e.g. if all you decide you want to do is change color or whether you do want a function to be called. Take a look at a couple of examples:
https://stackoverflow.com/questions/43035378/qtreeview-item-hover-selected-background-color-based-on-current-color
https://stackoverflow.com/questions/28802763/highlight-item-with-mouse-hover-in-qtreeview
https://stackoverflow.com/questions/53452304/qtreeview-how-to-call-an-action-when-mouse-hovers-over-a-row

[SRaD]

I'm trying to capture when the mouse hovers over a specific row and column in my TreeView. I've added a class which inherits from QStyledItemDelegate and set it to a column, and overridden the paint(...) method. The paint method gets called, but QStyle::State_MouseOver does not seem to be capturing the event.

Thoughts where I am going wrong on this?

mainWindow.cpp

tvd = new MyTreeViewDelegate;

treeView = new MyTreeView;
treeView->setModel(treeModel);
treeView->setItemDelegateForColumn(0, tvd);                          

treeViewDelegate.cpp

void MyTreeViewDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QModelIndex parent = index.parent();

    if (parent.row() == 0 && (option.state & QStyle::State_MouseOver)) 
        std::cout << "we have mouseover!" << std::endl;

    // ...
}

[mrjj]

Hi
Can you try with
myTreeView->viewport()->setAttribute( Qt::WA_Hover );

[SRaD]

@mrjj Thanks, that fixed it.