[Martin]

Hi,

is there a chance to create a TreeView including some extra icons / buttons. I want to check / select nodes and their children. Or is it possible to use custom items per node? An example would be very helpful.

Thank you
Martin

[GüntherFelgo Team]

Hi,

QML is very flexible and you can create the behavior you want with some custom UI. You can see a snippet for a ListView with foldable items here: https://felgo.com/doc/apps-howto-scrollview-and-listview/#create-foldable-sub-sections-in-list-delegates

You can create something similar for your use-case by customizing the delegate.

Best,
Günther

[Martin]

Hi Günther,

thank you. But since I have to deal with tree structures I thought the TreeView is the correct item. Otherwise I have to implement the tree structures by myself in the ListView. That’s very hard work to do.

Kind regards
Martin

[GüntherFelgo Team]

Sure, TreeView is also a viable choice if it fits your use-case and model setup better. I am not familiar with the specific customisation options or limitations, but it is possible to use own delegates similar to the ListView. Generally own delegate are the way to go when customising views.

Qt 5 TreeView has an itemDelegate, rowDelegate and headerDelegate properties: https://doc.qt.io/qt-5/qml-qtquick-controls-treeview.html

For Felgo 4 and Qt 6, the control was changed and supports a TreeView::delegate: https://doc.qt.io/qt-6/qml-qtquick-treeview.html.

[Martin]

Sounds good. Is there an example I can start with? I’m struggling with the model. Do I have to create it by myself in C++?

[GüntherFelgo Team]

Yes, the TreeView expects a custom C++ model based on QAbstractItemModel. I don’t have an example at hand, but it is generally more complex than the ListView, where you can have a QML ListModel or JS array as the data source.