In a QTreewidget, how could I retrieve selected items...?

[MSDQuick]

Hello;

I have a QTreewidget in my project, and I would like to retrieve list of selected items, when I select them using dragging mouse over them:

Any idea?
(or tutorial?)

Thanks.
MSD.

[VRonin]

signal: treeWidget->selectionModel(),&QItemSelectionModel::selectionChanged
getter: treeWidget->selectionModel()->selectedIndexes()

[MSDQuick]

@VRonin
Thank you VRonin thanks for reply, but I'm new in QT and I don't know how should I use Signals and Slots :(

[mrjj]

@MSDQuick
Hi
The treeWidget->selectionModel()->selectedIndexes() returns a list.
http://doc.qt.io/qt-5/qitemselectionmodel.html#selectedIndexes

QModelIndexList selection = yourTableView->selectionModel()->selectedRows();

// Multiple rows can be selected
for(int i=0; i< selection.count(); i++)
{
    QModelIndex index = selection.at(i);
    qDebug() << index.row();
}

You can then use a for loop to process the selected.

To use the signal, you need a slot function that matches the signal
void QItemSelectionModel::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)

So you need a function like
void xxxxx::TreeSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected) {
}
And connect signal to slot
connect(selectionModel, SIGNAL(selectionChanged(const QItemSelection&,const QItemSelection&)), this, SLOT(TreeSelectionChanged(const QItemSelection&,const QItemSelection&)));

[MSDQuick]

@mrjj
You mean I have to put this in my mainwindow.h file :

public slots:
    void TreeSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);

and this in mainwindow.cpp :

void MainWindow::TreeSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
    QModelIndexList selection =  ui->myTreeView->selectionModel()->selectedRows();

      for(int i=0; i< selection.count(); i++)
        {
            QModelIndex index = selection.at(i);
            qDebug() << index.row();
         }
}

Right?

[mrjj]

@MSDQuick
Hi , you are mixing a little.
The TreeSelectionChanged is fired each time you select one
so processing the list there might not be what you want.

Depending on your design. Do you press a button after you have selected some?

You can use the

 QModelIndexList selection =  ui->myTreeView->selectionModel()->selectedRows();

      for(int i=0; i< selection.count(); i++)
        {

without using the signal. Like in a button when pressing ok. etc.

[MSDQuick]

@MSDQuick
I have a TreeView click() event in my project.
So, what I want is : as soon as I click and drag the mouse in the TreeView , the signal be fired.

[mrjj]

@MSDQuick
Ok then TreeSelectionChanged is what you want.

[MSDQuick]

@mrjj
And is this correct:

void MainWindow::on_myTreeView_clicked(const QModelIndex &index)
{
    ui->myTreeView->selectionModel(),&QItemSelectionModel::selectionChanged;    
}

[mrjj]

@MSDQuick
Not at all.
In constructor of mainwindow, connect the signal and slot
connect(treeWidget->selectionModel(), SIGNAL(selectionChanged(const QItemSelection&,const QItemSelection&)), this, SLOT(TreeSelectionChanged(const QItemSelection&,const QItemSelection&)));

Then the treeWidget call your slot.

You should read over this
http://doc.qt.io/qt-5/signalsandslots.html

[MSDQuick]

@mrjj
Oh thanks, I got it. It works now...