I already postet the question here (
https://stackoverflow.com/questions/59130393/qlistview-moverow-from-model-not-called),
but maybe it is better to write here.
I'm having a Listview which should show a preview of an image. The model it
self contains also the original image. In the listview it should be able to
change the order of the items, where I have problems.
Here you can find the ListItem and the Listmodel:
class ListItem{public:
ListItem();
ListItem(QString name, QImage image);
QImage* previewIcon();
void setPreviewIcon(QImage icon);
QImage *image();
void setImage(QImage* image);
void setImage(QImage image);
void setName(QString name);
void setChecked(bool checked);
QString name();
bool checked();private:
QImage m_preview;
QImage m_image;
QString m_name;
bool m_checked;};
This model stores the image it self and a preview of it. This works fine
for inserting and removing items:
class ListModel: public QAbstractListModel{
Q_OBJECT
public:
ListModel(QObject *parent = nullptr);
int rowCount(const QModelIndex &parent = QModelIndex()) const override;
QVariant data(const QModelIndex &index, int role =
Qt::DisplayRole) const override;
bool setData(const QModelIndex &index, const QVariant &value,
int role = Qt::EditRole) override;
Qt::ItemFlags flags(const QModelIndex &index) const override;
QModelIndex index(int row, int column = 0, const QModelIndex
&parent = QModelIndex()) const override;
bool removeRow(int row, const QModelIndex &parent = QModelIndex());
bool removeRows(int row, int count, const QModelIndex &parent
= QModelIndex()) override;
bool insertRow(int row, const QModelIndex &parent = QModelIndex());
bool insertRows(int row, int count, const QModelIndex &parent
= QModelIndex()) override;
bool appendItem(ListItem* item);
bool moveRows(const QModelIndex &sourceParent, int sourceRow,
int count, const QModelIndex &destinationParent, int destinationChild)
override;
bool moveRow(const QModelIndex &sourceParent, int sourceRow,
const QModelIndex &destinationParent, int destinationChild);
Qt::DropActions supportedDropActions() const override;
QHash<int, QByteArray> roleNames() const override;private:
ListItem* getItem(const QModelIndex &index) const;
private:
QList<ListItem*> m_scannedDocuments;};
This is the setup of the QListView:
m_scannedDocumentsModel = new ListModel();
m_scannedDocuments = new QListView();
m_scannedDocuments->setModel(m_scannedDocumentsModel);
m_scannedDocuments->setDragDropMode(QAbstractItemView::InternalMove);
m_scannedDocuments->setMovement(QListView::Snap);
m_scannedDocuments->setDefaultDropAction(Qt::MoveAction);
Dragging and droping is fine for the preview, the name and if it is checked
or not. The problem is the image "m_image". When I'm doing a move in the
view, the view calls insertRows() and inserts a new item and removes the
old item, but does not call moveRows.
Why moveRows() is not called?
Here you can find the full implementation: ListModel.cpp
<https://github.com/Murmele/skanlite/blob/ListViewInSkanlite/src/ListModel.cpp>
ListModel.h
<https://github.com/Murmele/skanlite/blob/ListViewInSkanlite/src/ListModel.h>
Another approach I tested is, to create a userRole for the image it self.
Here I tried to reimplement roleNames() as
QHash<int, QByteArray> ListModel::roleNames() const {
QHash<int, QByteArray> roles = QAbstractItemModel::roleNames();
roles[Qt::UserRole] = "Qt::UserRole";
return roles;}
and implemented the role Qt::UserRole in setdata()/data() but this doesn't
work either.
What is the best way to have a complex model and moving them in a listview?
Cheers,
Martin
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