Getting data from C++ model inside delegate - c++

Question

I have a model on C++ end and a treeview
TreeView {
id: view
itemDelegate: Rectangle{
property int indexOfThisDelegate: model.index
Text {
text:???
font.pixelSize: 14
}
}
model: myModel
onCurrentIndexChanged: console.log("current index", currentIndex)
TableViewColumn {
title: "Name"
role: "type"
resizable: true
}
onClicked: console.log("clicked", index)
onDoubleClicked: isExpanded(index) ? collapse(index) : expand(index)
}
How can I get data from my TreeItem? The problem is that indexOfThisDelegate is integer instead of QModelIndex, so
I would like to have something like
Text {
text:model.getDescription(currentlyPaintedModelIndex)
font.pixelSize: 14
}
or should I have a mapping between integer and tree QModelIndex?

Answer 1

Ok, figured it out myself
In the model:
QHash<int, QByteArray> MenuTreeModel::roleNames() const
{
QHash<int, QByteArray> roles;
roles[TitleRole] = "Title";
return roles;
}
// of course it could me more complex with many roles
QVariant MenuTreeModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid())
{
return QVariant();
}
MenuTreeItem *item = itemForIndex(index);
if (role != TitleRole)
{
return QVariant();
}
QString str = item->data(index.column()).toString();
return item->data(index.column());
}
Our custom tree item (for example):
class MenuTreeItem
{
// item data, contains title
QList<QVariant> m_itemData;
};
In qml:
TreeView {
id: view
itemDelegate: Rectangle{
Text {
text:model.Title
font.pixelSize: 14
}
}
model: myModel
}