QListView deselect item by clicking on selected Item

[A Former User]

Hey,

I have a question about the QListView. In a QListView I can set the SelectionMode via listView->setSelectionMode(QAbstractItemView::SelectionMode).I want to achieve the same as with QAbstractItemView::ExtendedSelection but without pressing the CTRL key. The best would be to simply click on the activated item and this will deselect it. Is this possible in a simple way?

[mrjj]

@Gabber
Hi
Ok. i missed the shift part.

Well you can try a mousepress override.
Normally one would subclass QItemSelectionModel but I'm not sure if we can know ctrl was pressed (in the view) and
change the selection. logic

You can try

class ToggleListView : public QListView
{
    Q_OBJECT
public:
    explicit ToggleListView(QWidget *parent = Q_NULLPTR) : QListView(parent) {}
protected:
    void mousePressEvent(QMouseEvent *event) override
    {
        Qt::KeyboardModifiers keys;
        keys.setFlag(Qt::ControlModifier);
        event->setModifiers(keys);
        QListView::mousePressEvent(event);
    }
};

Seems to be ok but you might want to test if shift is pressed and then not set CTRL.

[mrjj]

Hi
But does
setSelectionMode(QAbstractItemView::SelectionMode::MultiSelection);
not function as you want as it can select/deselect by clicking ?
(no ctrl)

[A Former User]

Hi,

no MultiSelection is not what I want. I want a single item selection and the possibility to select multiple items with shift. Selecting and deselecting a single selection should only be done by mouse click (not CTRL + mouse).

[mrjj]

@Gabber
Hi
Ok. i missed the shift part.

Well you can try a mousepress override.
Normally one would subclass QItemSelectionModel but I'm not sure if we can know ctrl was pressed (in the view) and
change the selection. logic

You can try

class ToggleListView : public QListView
{
    Q_OBJECT
public:
    explicit ToggleListView(QWidget *parent = Q_NULLPTR) : QListView(parent) {}
protected:
    void mousePressEvent(QMouseEvent *event) override
    {
        Qt::KeyboardModifiers keys;
        keys.setFlag(Qt::ControlModifier);
        event->setModifiers(keys);
        QListView::mousePressEvent(event);
    }
};

Seems to be ok but you might want to test if shift is pressed and then not set CTRL.

[A Former User]

@mrjj
Thanks for your code example, it works perfectly!

I have thought about the whole thing again and will stay for now with a simple select (without shift). Therefore I will mark the thread as solved.