Many thanks to everybody. I decided to make a backport to qt5.15

@VRonin said in Treeview remove row:

if(parent.isValid() && parent.column()>0) return 0; const TreeItem *parentItem = getItem(parent); return parentItem ? parentItem->childCount() : 0;

All good now. Thank you very much, sir.

It should be used as following:
__listView.positionViewAtIndex(treeView.currentIndex.row, treeView.Beginning)

And it works when the treeview's length is enough long.

@lawrence-emke hi,
i think what you need is QML Flickable type

Window { visible: true width: 640 height: 480 title: qsTr("Hello World") Flickable { width: 400; height: 400 contentWidth: gameBoard.width; contentHeight: gameBoard.height clip: true ScrollBar.horizontal: ScrollBar { active: true} ScrollBar.vertical: ScrollBar { active: true} Rectangle{ id: gameBoard height: 2000 width: 2000 color: "grey" Repeater{ model: 10 Drag.active: dragMouse.drag.active Rectangle{ height: 80;width: 80 x : width * index y : height * index color: Qt.rgba(Math.random(),Math.random(),Math.random(),1) MouseArea{ id:dragMouse anchors.fill: parent drag.target: parent } } } } } }

@SGaist thanks a lots for your reply, bu how to do it?

@sailord
So it did use SizeHint but it was just returning too small value ?
Super :)

Hello,

Thanks a lot for the replies.

I found out another way by which we can hide the 'section' if the parent doesn't have any childrens.
ui.treeView->setRowHidden(parentRow, rootIndex, true)

In my example,
Fruits -
............Apple
............Orange
Animals -
.............Lion
.............Tiger
Colors -
............Red
............Green
............BLue

Fruits is 0th parent
Animals is 1st parent
Colors is the 2nd parent

So whenever any of the children's are missing ( which we come to know while filling up the model ), I am setting the respective "parent" row as hidden.
This approach worked fine and as expected.

Is anything wrong with this approach?
Model remains the same, only the view is hidden or unhidden based on some condition.
Please Let me know.

Hi,
It seems I can go with the solution I described. I don't need the tree view to be focused, so I just removed the “focus rect” (if that is the name Qt people know ;)) by setting the focus policy of the tree to Qt.NoFocus. I draw the “cursor” then myself by giving a different backlog in QAbstractItemModel::data. That makes anyway sense since the cursor position is part of my domain model.

Thanks for help and inspiration!
Dan

@VRonin said in Implement QSortFilterProxyModel with own TreeModel?:

Good guess, can you show us your code?

I solved it: I had to pass the parent index (tree structure), so the line should look like this:

QVariant data = m_proxy->data(m_proxy->index(index.row(), 4, index.parent()));

Hi and welcome to devnet,

What version of Qt are you using ?
On what OS ?
With what compiler ?
Can you provide a minimal compilable example that shows that behaviour ?

By adding the line "property alias mouser: mouseArea" to the TreeView.qml of Qt, I can implement mouser.onPressed: {...} inside my TreeView code.
This way both the selection and drag&drop work, but I actually don't like the idea of modifying Qt code.

No one out there with an approach how to solve this a bit cleaner?

@VRonin
Can you please provide an example or something to follow? Because I am still a newbie at both Qt and QML.
Sorry for bothering you with my many questions.

Update:
as you can see in the code, I change the state of the delegate through the mouse area in the delegate (it's commented out in the code). I was using it to test the states, now I've noticed another thing; Whenever I collapse the parent Item and then expand it, the previous states are not saved....does this have to do anything with what you mentioned?

The best way seems to use QDropEvent::source to get the QTreeWidget and use currentItem() on it. :)

@6thC did your application consist of a tree and you could apply a delegate to specific items? because that's where I'm stuck now. I am still researching on how to connect QML with C++ and as usual if I figured out a way of applying delegates to specific items based on a logical condition (like your warning and maximum states), I will let you know.

Thanks for your time bro!