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  1. Qt
  2. QTBUG-94226

QListView - broken drag-n-drop items movement

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Done
    • Affects Version/s: 5.15.2, 6.1.0
    • Fix Version/s: 6.1.3, 6.2.0 Alpha
    • Component/s: Widgets: Itemviews
    • Labels:
      None
    • Platform/s:
      Windows
    • Commits:
      14e09ada69fc3f1b09a8ad8228c3b8ebb542b220 (qt/qtbase/dev) 6809ee8f3e52187807807fd4ff7f59ec90a8e234 (qt/tqtc-qtbase/5.15) 04cc12e26f8ee356ae666f50a85f0db3804d9c8a (qt/qtbase/6.1)

      Description

      I have the next code 

      #include <QFont>
      #include <QApplication>
      #include <QListView>
      #include <QStandardItemModel>
      
      class MyModel : public QStandardItemModel
      {
      public:
          Qt::ItemFlags flags(const QModelIndex &index) const override
          {
              Q_UNUSED(index);
              return Qt::ItemIsSelectable
                      | Qt::ItemIsEditable
                      | Qt::ItemIsDragEnabled
                      | Qt::ItemIsEnabled;
          }
      };
      //------------------------------------------------------------------------------
      int main(int argc, char *argv[])
      {
          QApplication a(argc, argv);
          a.setFont({"Verdana", 16});
          MyModel model;
          auto style = a.style();
          model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogCancelButton), "cancel"));
          model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_FileDialogInfoView), "info"));
          model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogOpenButton)  , "open"));
          model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogSaveButton)  , "save"));
          model.appendRow(new QStandardItem(style->standardIcon(QStyle::SP_DialogOkButton)    , "cancel"));
      
          QListView list;
          list.show();
          list.resize(700, 500);
          list.setModel(&model);
      
          list.setIconSize({64, 64});
          list.setViewMode(QListView::IconMode);
          list.setWrapping(false);
          list.setResizeMode(QListView::Fixed);
          list.setMovement(QListView::Snap);
          list.setGridSize({128, 128});
          list.setSelectionBehavior(QAbstractItemView::SelectItems);
          list.setSelectionMode(QAbstractItemView::ExtendedSelection);
          list.setDragDropMode(QListView::DragDrop);
          list.setAcceptDrops(true);
          list.setDefaultDropAction(Qt::MoveAction);
          list.setDragDropOverwriteMode(false);
          list.showDropIndicator();
          return a.exec();
      }
      
      

      In Qt 5.13.2 (MinGW x64) it works very well. I can move items in list similiarly like icons on the OS Windows desktop with snapping to grid. But in Qt 5.15.2 items have become undraggable and unmovable with the same code. The same is true for Qt 6.1.0 - the newest version of Qt.

       

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            Assignee:
            vhilshei Volker Hilsheimer
            Reporter:
            alexnevskiy Alex Nevskiy
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              Dates

              Created:
              Updated:
              Resolved:

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