[Qt-interest] Trouble making ListView accepting drops

[Nathan Hüsken]

Bump.

Sorry, but I still can not get it to work.
Anyone knows a code example where elements can be copied from one list
view to another per drag and drop?

Thanks!

On 10/05/2011 01:19 PM, Nathan Hüsken wrote:
> Hi,
> 
> I have two list views. The first (ImageList) is a list of images, the
> second (ReferencesList) is a list of references to these images. The
> first has the model ImageListModel, the second the model
> ReferencesListModel.
> 
> Now I want to enable drag and drop, dragging images from the first
> listview to the second to create a new reference.
> 
> In the constructor of the main window I do this to enable drag and drop:
> 
> imageList->setDragEnabled(true);
> referencesList->setAcceptDrops(true);
> referencesList->setDropIndicatorShown(true);
> 
> Also, I added the code, listed below, to enable drag and drop for the lists.
> Now, dragging an element from the imageList works, but when I drag it
> over the referencesList, the icon indicates I can not drop it here.
> 
> What am I missing?
> Thanks!
> 
> This is the relevant code I added to the models:
> -------------------------- ImageListModel.cpp------------------------
> Qt::DropActions ImageListModel::supportedDragActions() const {
>   return Qt::CopyAction;
> }
> 
> const QPixmap ImageListModel::getThumbnail(const QString& name) const {
>   return m_images.find(name)->second.m_thumbnail;
> }
> 
> Qt::ItemFlags ImageListModel::flags(const QModelIndex& index) const {
>    Qt::ItemFlags defaultFlags = QAbstractListModel::flags(index);
>    if (index.isValid())
>      return Qt::ItemIsDragEnabled | defaultFlags;
>    else
>      return defaultFlags;
> }
> 
> QStringList ImageListModel::mimeTypes() const
> {
>   QStringList types;
>   types << "application/image.name";
>   return types;
> }
> 
> QMimeData *ImageListModel::mimeData(const QModelIndexList &indexes) const {
>      QMimeData *mimeData = new QMimeData();
>      QByteArray encodedData;
> 
>      QDataStream stream(&encodedData, QIODevice::WriteOnly);
> 
>      foreach (QModelIndex index, indexes) {
>          if (index.isValid()) {
>              QString text = m_imageNames[index.row()]; // Image name
> contains the names of the images and is supposed to be used for reference
>              stream << text;
>          }
>      }
>      mimeData->setData("application/image.name", encodedData);
>      return mimeData;
>  }
> 
> ----------------------------ReferecesListModel.cpp---------------------
> QStringList ReferencesListModel::mimeTypes() const {
>   QStringList types;
>   types << "application/image.name";
>    return types;
> }
> 
> Qt::DropActions ReferencesListModel::supportedDropActions() const {
>   return Qt::CopyAction;
> }
> 
> bool ReferencesListModel::dropMimeData(const QMimeData *data,
> Qt::DropAction action, int row, int column, const QModelIndex &parent) {
>   // Not implemented yet
>   return true;
> }
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