Implement clearItemData in common models

A virtual method clearItemData was added to QAIM for Qt6.
This patch implements that method to all Qt concrete models for which
it makes sense.

Task-number: QTBUG-69616
Change-Id: If980fcfc36f723128bc56ec4587c5c3a338dbbcc
Reviewed-by: David Faure <david.faure@kdab.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/widgets/itemviews/qtreewidget.cpp b/src/widgets/itemviews/qtreewidget.cpp
index a0af27115d..a898661963 100644
--- a/src/widgets/itemviews/qtreewidget.cpp
+++ b/src/widgets/itemviews/qtreewidget.cpp
@@ -390,6 +390,27 @@ bool QTreeModel::setData(const QModelIndex &index, const QVariant &value, int ro
     return false;
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+bool QTreeModel::clearItemData(const QModelIndex &index)
+{
+    if (!checkIndex(index, CheckIndexOption::IndexIsValid))
+        return false;
+    QTreeWidgetItem *itm = item(index);
+    if (!itm)
+        return false;
+    const auto beginIter = itm->values.at(index.column()).cbegin();
+    const auto endIter = itm->values.at(index.column()).cend();
+    if (std::all_of(beginIter, endIter, [](const QWidgetItemData& data) -> bool { return !data.value.isValid(); })
+        && !itm->d->display.at(index.column()).isValid()) {
+        return true; //it's already cleared
+    }
+    itm->d->display[index.column()] = QVariant();
+    itm->values[index.column()].clear();
+    emit dataChanged(index, index, QVector<int>{});
+    return true;
+}
+#endif
+
 QMap<int, QVariant> QTreeModel::itemData(const QModelIndex &index) const
 {
     QMap<int, QVariant> roles;