QTreeWidget error in documentation

Mummoc

Hi, i'm not sure if i'm posting this in the right place but here i go.

Per the documentation, the itemExpanded() SIGNAL should not be emited when calling expandAll(). However it's apparently called. Same issue for itemCollapsed() and collapseAll().

    QTreeWidget* treeA = new QTreeWidget(this);

    treeA->setSelectionMode(QAbstractItemView::NoSelection);
    treeA->setColumnCount(1);
    treeA->setVerticalScrollMode(QAbstractItemView::ScrollPerItem);
    treeA->setHeaderHidden(true);

    QTreeWidgetItem* parentItemA = new QTreeWidgetItem(treeA, QStringList(QString("parent 1")));
    QTreeWidgetItem* childItemA1 = new QTreeWidgetItem(parentItemA, QStringList(QString("child 1")));
    QTreeWidgetItem* childItemA2 = new QTreeWidgetItem(parentItemA, QStringList(QString("child 2")));
    QTreeWidgetItem* childItemA3 = new QTreeWidgetItem(childItemA1, QStringList(QString("child 3")));
    QTreeWidgetItem* childItemA4 = new QTreeWidgetItem(childItemA1, QStringList(QString("child 4")));

    parentItemA->setFlags(parentItemA->flags() | Qt::ItemIsAutoTristate);
    childItemA1->setFlags(childItemA1->flags() | Qt::ItemIsAutoTristate);
    childItemA2->setFlags(childItemA2->flags() | Qt::ItemIsAutoTristate);
    childItemA3->setFlags(childItemA3->flags() | Qt::ItemIsAutoTristate);
    childItemA4->setFlags(childItemA4->flags() | Qt::ItemIsAutoTristate);

    parentItemA->setCheckState(0, Qt::Unchecked);
    childItemA1->setCheckState(0, Qt::Unchecked);
    childItemA2->setCheckState(0, Qt::Unchecked);
    childItemA3->setCheckState(0, Qt::Unchecked);
    childItemA4->setCheckState(0, Qt::Unchecked);

    connect(treeA, SIGNAL(itemExpanded(QTreeWidgetItem*)), this, SLOT(test(QTreeWidgetItem*)));
    connect(treeA, SIGNAL(itemCollapsed(QTreeWidgetItem*)), this, SLOT(test(QTreeWidgetItem*)));

    QHBoxLayout* layout = new QHBoxLayout(this);
    layout->addWidget(treeA);

    treeA->expandAll();
    treeA->collapseAll();

My test SLOT:

void MainWidget::test(QTreeWidgetItem* item){
    qInfo() << item->text(0);
}

And finally the output i get:

"parent 1"
"child 1"
"child 3"
"child 4"
"child 2"
"parent 1"
"child 3"
"child 1"
"child 2"
"child 4"

Is this a known issue ? Is there something I missed ?

Christian Ehrlicher

@Mummoc said in QTreeWidget error in documentation:

Is this a known issue ?

No

Is there something I missed ?

Not until now, thx
https://codereview.qt-project.org/c/qt/qtbase/+/385114