}
/*!
+ Returns whether a model can accept a drop of data.
+
+ This can be used to indicate whether a drop of certain data is allowed, for example
+ by using a 'forbidden' emblem on a mouse cursor during a drag operation.
+
+ This method returns true by default.
+
+ \sa dropMimeData(), {Using drag and drop with item views}
+ */
+bool QAbstractItemModel::canDropMimeData(const QMimeData *data, Qt::DropAction action,
+ int row, int column,
+ const QModelIndex &parent) const
+{
+ return true;
+}
+
+/*!
Handles the \a data supplied by a drag and drop operation that ended with
the given \a action.
greater than or equal zero, it means that the drop occurred just before the
specified \a row and \a column in the specified \a parent.
- \sa supportedDropActions(), {Using drag and drop with item views}
+ \sa supportedDropActions(), canDropMimeData(), {Using drag and drop with item views}
*/
bool QAbstractItemModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
int row, int column, const QModelIndex &parent)
virtual QStringList mimeTypes() const;
virtual QMimeData *mimeData(const QModelIndexList &indexes) const;
+ virtual bool canDropMimeData(const QMimeData *data, Qt::DropAction action,
+ int row, int column, const QModelIndex &parent) const;
virtual bool dropMimeData(const QMimeData *data, Qt::DropAction action,
int row, int column, const QModelIndex &parent);
virtual Qt::DropActions supportedDropActions() const;
void match();
void dropMimeData_data();
void dropMimeData();
+ void canDropMimeData();
void changePersistentIndex();
void movePersistentIndex();
const QModelIndex &destinationParent, int destinationChild);
void reset();
+ bool canDropMimeData(const QMimeData *data, Qt::DropAction action,
+ int row, int column, const QModelIndex &parent) const;
+
int cCount, rCount;
mutable bool wrongIndex;
QVector<QVector<QString> > table;
QAbstractItemModel::reset();
}
+bool QtTestModel::canDropMimeData(const QMimeData *data, Qt::DropAction action,
+ int row, int column, const QModelIndex &parent) const
+{
+ Q_UNUSED(data);
+ Q_UNUSED(action);
+
+ // For testing purposes, we impose some arbitrary rules on what may be dropped.
+ if (!parent.isValid() && row < 0 && column < 0) {
+ // a drop in emtpy space in the view is allowed.
+ // For example, in a filesystem view, a file may be dropped into empty space
+ // if it represents a writable directory.
+ return true;
+ }
+
+ // We then arbitrarily decide to only allow drops on odd rows.
+ // A filesystem view/model might be able to drop onto (writable) directories.
+ return row % 2 == 0;
+}
+
/**
* The source Model *must* be initialized before the _data function, since the _data function uses QModelIndexes to reference the items in the tables.
* Therefore, we must initialize it globally.
}
}
+void tst_QAbstractItemModel::canDropMimeData()
+{
+ QtTestModel model(3, 3);
+
+ QVERIFY(model.canDropMimeData(0, Qt::CopyAction, -1, -1, QModelIndex()));
+ QVERIFY(model.canDropMimeData(0, Qt::CopyAction, 0, 0, QModelIndex()));
+ QVERIFY(!model.canDropMimeData(0, Qt::CopyAction, 1, 0, QModelIndex()));
+}
+
void tst_QAbstractItemModel::changePersistentIndex()
{
QtTestModel model(3, 3);