Cannot override FINAL property for delegate and selection

GrandAlex

Hi all,

I have some troubles when I want to implement selection in my TreeView.
I'm following (well I think I am) the documentation and add the following lines in my delegate :

delegate: Item {
    required property bool selected
    required property bool current
    // ...
}

(source:https://doc-snapshots.qt.io/qt6-6.4/qml-qtquick-tableview.html#selecting-items)

My actual code is:

delegate: TreeViewDelegate {
                            id: treeDelegate
                            required property bool selected
                            required property int row
                            indicator: Rectangle {
                                x: leftMargin + (depth * indentation)
                                width: 10
                                height: 10
                                color: "red"
                                y: parent.height / 2 - height / 2
                            }
                            background: Rectangle {
                                width: parent.width
                                opacity: treeDelegate.selected ? 1 : 0
                                color: expanded ? "white" : "gray"
                            }
                            contentItem: Text {
                                text: treeDelegate.selected ? "selected" : "blabla"
                            }
                            onClicked: {
                                treeView.selectionModel.select(treeView.modelIndex(treeDelegate.row, 0), ItemSelectionModel.Toggle | ItemSelectionModel.Rows);
                                console.log("clicked:", treeView.model.data(treeView.modelIndex(treeDelegate.row, 0)));
                                console.log("Selection model selected? ", treeView.selectionModel.isSelected(treeView.modelIndex(treeDelegate.row, 0)));
                                console.log("Delegate selected? ", treeDelegate.selected);
                            }
                        }

For the record, my model is a simple QFileSystemModel, just for test purposes.
I'm trying to get some inspiration from this post : https://forum.qt.io/topic/139031/problem-with-selection-in-treeview-qt6

But I cannot execute my QML code, my view is not loaded because I have an error.
I have the following error on my "require property" :
Cannot override FINAL property

What I am doing wrong ?

dheerendra

@GrandAlex said in Cannot override FINAL property for delegate and selection:

required property bool selected

WHy are you declaring the property required property bool selected again ? 'selected' property is from TreeViewDelegate. Use some other name.

GrandAlex

If I don't add this, my selection system is not available.
Is it not what is advised by the documentation in Qt 6.4, here ? https://doc-snapshots.qt.io/qt6-6.4/qml-qtquick-tableview.html#selecting-items

GrecKo

you can specify that an existing property should be required without redeclaring it : https://doc.qt.io/qt-6/qtqml-syntax-objectattributes.html#required-properties
In your case:

required selected