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QTreeView hide that "1" category?



  • I'd like to hide that gray rectangle with "1" in it.. Is it possible?

    It's seen here,
    http://qt-project.org/doc/qt-4.8/images/selection2.png

    Just above "America".



  • You can use "setHeaderHidden(true)":http://qt-project.org/doc/qt-5.0/qtwidgets/qtreeview.html#headerHidden-prop;

    @treeView->setHeaderHidden(true);@



  • Thanks a bunch.
    Also, another question: Can I have different context menus for different items within TreeView?
    I'd like to decide what options to display basing on item icon path.



  • When you create a custom context menu, with either the customContextMenuRequested() signal, or a redefinition of the virtual function contextMenuEvent() of your view (see "contextMenuPolicy":http://qt-project.org/doc/qt-4.8/qwidget.html#contextMenuPolicy-prop), you can get the item under the mouse with "QAbstractItemView::indexAt()":http://qt-project.org/doc/qt-4.8/qabstractitemview.html#indexAt and populate your menu accordingly.



  • Note that a well-behaved model would return actually useful data for the headers. So, instead of 1 it would display a useful name for the column.



  • bq. Note that a well-behaved model would return actually useful data for the headers. So, instead of 1 it would display a useful name for the column.

    Yes althrough I don't need or want headers this time, for this application.



  • Uh, and one more question.

    If I want to programatically add tab widget, that contains a web view, do I have to create a new class that inherits from QTabWidget? (So that I can place widgets inside QTabWidget)

    I haven't seen anything like myTab->addWidget.



  • QTabWidget::addTab already allows that without subclassing.



  • Eeh. Another question. It's so hard (if not impossible) to find answers for such 'easy' things.
    Can I somehow prevent renaming tree nodes on double click that are inside QTreeView?

    Cheers.



  • You can either disable edit triggers for the whole view with:
    @theView−>setEditTriggers(QAbstractItemView::NoEditTriggers);@

    or make that the set of flags returned by the model's QAbstractItemModel::flags() function doesn't include Qt::ItemIsEditable for the non-editable items or use QStandardItem::setEditable(false) if the model is a QStandardItemModel.



  • Thanks, also, is there some way to start renaming a TreeView item?
    Something like myQStandardItem->startRenaming();



  • You have to call the view's "edit()":http://qt-project.org/doc/qt-4.8/qabstractitemview.html#edit function with the model index to edit (myQStandardItem->index()).



  • Another question. I've got this:
    @
    QModelIndex m = projectView->indexAt(p);
    QString icn = m.data(Qt::DisplayRole).toString();
    QMessageBox::warning(0,"!",icn);
    @
    But that displays name of that index (for example, someItemAtTreeView), and I want to get that item's icon instead.
    I've tried Qt::DecorationRole, but I couldn't get it to return me a QIcon or QPixmap..

    Edit: please use @ tags around code sections; Andre



  • Why are you converting to a string, if what you are after is an image? I would convert to a QImage or a QPixmap...

    And yes, you do need to use the DecorationRole.



  • Could you give me an example?

    bq. Why are you converting to a string, if what you are after is an image?

    That was an example of what works for me, though, I don't know how to change it so I get QIcon.
    If I try:

    QIcon icn = m.data(Qt::DecorationRole);

    It is unable to convert it into QIcon. Hmmph. If I do: m.data(Qt::DecorationRole).toString() it's always an empty string.



  • Well, that is because it probably isn't a QIcon. Converting to a string really isn't going to help you. Did you try converting to a QImage or a QPixmap using QVariant::toImage() or QVariant::toPixmap?



  • Uh, I don't have these functions in QVariant. Also, class reference doesn't seem to introduce them either.



  • For these types, you might have to use QVariant::value<QPixmap>() / QVariant::value<QIcon>().

    You could check what type is actually stored with QVariant::typeName().



  • Done.
    Now, is there a way to dected whether user stopped editing QTreeView item's name? (As I've forced QAbstractItemView::edit() before, now I'd like to detect when editing stops)



  • If you don't set a delegate, the model is updated when the editor widget is closed, so, you can catch the change with the model's dataChanged() signal.

    If you want to see both the new and old data, you need to either derive the model, to override QAbstractItemModel::setData, or install a delegate, whose QAbstractItemDelegate::setModelData() function will be called at the end of editing.


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