QTreeview : How to change the defalut position of the text item - qt

Question

Could you please let me know how to chage the position of the item in QTreeView.By default the item displayed at Left most and in the center of the item box.But how should i change it so that it will display in top

Answer 1

Using a Qt built-in item model
If you are using e.g. QFileSystemModel you have to inherit from it and override the data() behaviour:
class MyFileSystemModel : public QFileSystemModel {
public:
QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const {
if (role == Qt::TextAlignmentRole)
return Qt::AlignTop; //maybe different result depending on column/row
else
return QFileSystemModel::data(index, role);
}
and then use that class instead.
Using own item model
If you implemented your own item model all you have to do is handle Qt::TextAlignmentRole in data():
QVariant MyTreeModel::data (const QModelIndex &index, int role) const {
if (role == Qt::TextAlignmentRole)
return Qt::AlignTop; //maybe different result depending on column/row
//handle other roles
return QVariant();
}
The tree view should now automatically align the items to the top.
If you want to customize the appearance even further, here are the roles that are used by QTreeView. For more customization I think you have to implement your own QTreeView subclass.
Using QStandardItemModel
If you did not implement your own model but used QStandardItemModel you have to call
setTextAlignment(Qt::Alignment alignment) with Qt::AlignTop on your standard items before adding them to the model.