Clearing selection in three view & next selection not executed issues...

Dariusz

Hey

I'm doing some tests with selection in tree views, I want to have only 1 selection active from my tree views, when I run this command, even tho it will clear selection in other view, when I press, initially there is no selection. It feels like bug/glitch? Any ideas how to bite it ? I have to click on item 2x, 1 to clear sel, second to actually select...

void getSelectedItemList(QTreeView *view) {
    qDebug() << view->selectionModel()->selectedIndexes();
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    QTreeView *view = new QTreeView();
    QStandardItemModel *model = new QStandardItemModel();

    for (int x = 0; x < 10; x++) {
        model->appendRow(new QStandardItem(QString::number(x)));
    }
    view->setModel(model);
    QWidget w;
    QGridLayout *lay = new QGridLayout(&w);
    lay->addWidget(view);

    QPushButton *btnA = new QPushButton("Print sel top");
    QObject::connect(btnA, &QPushButton::released, [=]() { getSelectedItemList(view); });

    QTreeView *view2 = new QTreeView();
    QStandardItemModel *model2 = new QStandardItemModel();
    for (int x = 0; x < 10; x++) {
        model2->appendRow(new QStandardItem(QString::number(x)));
    }
    view2->setModel(model2);

    QPushButton *btnB = new QPushButton("Print sel bottom");
    QObject::connect(btnB, &QPushButton::released, [=]() { getSelectedItemList(view2); });
    lay->addWidget(view2);
    lay->addWidget(btnA);
    lay->addWidget(btnB);

    auto selModelA = view->selectionModel();
    auto selModelB = view2->selectionModel();

    QObject::connect(selModelA, &QItemSelectionModel::selectionChanged, [=]() { view2->clearSelection(); });
    QObject::connect(selModelB, &QItemSelectionModel::selectionChanged, [=]() { view->clearSelection(); });

    w.show();
    return a.exec();
}

Dariusz

Hey

Another issue I found, if I do view->currentIndex(), after deselection this still returns a valid item!

JonB

@Dariusz said in Clearing selection in three view & next selection not executed issues...:

Another issue I found, if I do view->currentIndex(), after deselection this still returns a valid item!

For that one I think I know, though I would welcome anyone correcting me!

Current item and selected item are not the same thing. I don't find the docs explain much, but isn't current item the last one selected? Regardless of deselection? I think I understand selected item, not so much "current" item.

Once again, if any expert would care to clarify this I should be most interested.

Dariusz

Bump, can any1 help ?

Christian Ehrlicher

@Dariusz said in Clearing selection in three view & next selection not executed issues...:

Bump, can any1 help ?

Since the selectionChanged signal is called also when you clear the selection you created an endless loop I would guess. Put some debug output when you call clearSelection() to see if I'm correct.

@JonB: yes, selection and current index are two independent things

Dariusz

@Christian-Ehrlicher said in Clearing selection in three view & next selection not executed issues...:

@Dariusz said in Clearing selection in three view & next selection not executed issues...:

Bump, can any1 help ?

Since the selectionChanged signal is called also when you clear the selection you created an endless loop I would guess. Put some debug output when you call clearSelection() to see if I'm correct.

@JonB: yes, selection and current index are two independent things

Hey

Hmmmmmmmmmmmmmmmmmmmmmmmmm I think I might see the issues. Clearing selection on view2 emits signal of selectionChanged for view1 o.O ok I think I got it o.o