Show root path in QTreeview for QFileSystemModel.

Mammamia

I have a folder structure like this.

Qt_Apps
- Demo1
- Demo2

Now I want to show the contents of the above given directory in the same way as its shown above. Not only the contents but also the parent/root directory name.

QString path = "D:/Qt_Apps"
QFileSystemModel* fileModel = new QFileSystemModel(this);
fileModel->setFilter(QDir::NoDotAndDotDot | QDir::Files);
//set root path
fileModel->setRootPath(path);

//create view
QTreeView* view = new QTreeView(this);
view->setModel(model);

If I run the above example code then I could see that only the contents of the given directory is displayed as given below

Demo1
Demo2

Here the parent directory is omitted.
Is there any way to show also the parent directory in the treeview structure??

mrjj

Hi
I wonder if you use
http://doc.qt.io/qt-5/qabstractitemview.html#setRootIndex
with QFileSystemModels methods to get a QModelIndex,
http://doc.qt.io/qt-5/qfilesystemmodel.html#index-1
If you can change what is Root.
Never tried it so might be stupid suggestion :)

Mammamia

@mrjj

I have tried that also. But didn't help.

QString path = "D:/Qt_Apps";
QModelIndex indx = model->index(path);
qDebug() << indx.data();   // QVariant(QString, "Qt_Apps")

...
view->setRootIndex(indx);
...

mrjj

Ok, was just a thought.
Im not aware of other method to show the root
when its not a drive.

Mammamia

I have repeated my test to verify how setRootIndex() works.

Suppose if we are currently in directory "D:/Qt_Apps"

Test-1
Below code will show the contents of directory "D:/Qt_Apps/ColorApp"

QModelIndex indx = model->index("D:/Qt_Apps/ColorApp");
view->setRootIndex(indx);

Test-2
Now we are in the directory "D:/Qt_Apps/ColorApp"
Below code will take us back to its parent directory "D:/Qt_Apps"

QModelIndex indx = model->index("D:/Qt_Apps");
view->setRootIndex(indx);

VRonin

It's not super starightforward. Reimplementing the model to is an option (and probably the most efficient one) . if you want something out of the box you can use KSelectionProxyModel

QString path = "D:/Qt_Apps"
QFileSystemModel* fileModel = new QFileSystemModel(this);
fileModel->setFilter(QDir::NoDotAndDotDot | QDir::Files);
//set root path
fileModel->setRootPath("D:/");

QItemSelectionModel* fileSelection=new QItemSelectionModel(fileModel,this);

KSelectionProxyModel* subFolderProxy=new KSelectionProxyModel(fileSelection,this);
subFolderProxy->setFilterBehavior(KSelectionProxyModel::SubTrees);

fileSelection->select(fileModel->index("D:/Qt_Apps"),QItemSelectionModel::ClearAndSelect); //this is how you select subfolders

//create view
QTreeView* view = new QTreeView(this);
view->setModel(subFolderProxy);

Mammamia

@VRonin thanks for the Suggestion.. I am planning to re implement the model by myself.

Mammamia

I have written my own model by subclassing QStandardItemModel.
I have written a blog post with the code and explanation which can be found here,
Custom FileSystemModel display

mrjj

@Mammamia
Thank you for sharing!