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  4. [SOLVED]How to delete an item from the treeview by droping an item to pushbutton or to an group box
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[SOLVED]How to delete an item from the treeview by droping an item to pushbutton or to an group box

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drag and droptreeview
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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #28

    Implement it in one of the usual ways:

    • React to the delete or backspace key
    • Have a delete button that will delete the currently selected row/column etc.
    • Have a dedicated column with e.g. a QPushButton to delete the row completely.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    RatzzR 1 Reply Last reply
    0
    • SGaistS SGaist

      Implement it in one of the usual ways:

      • React to the delete or backspace key
      • Have a delete button that will delete the currently selected row/column etc.
      • Have a dedicated column with e.g. a QPushButton to delete the row completely.
      RatzzR Offline
      RatzzR Offline
      Ratzz
      wrote on last edited by
      #29

      @SGaist
      I already have a delete button which deletes entire row.

      --Alles ist gut.

      RatzzR 1 Reply Last reply
      0
      • RatzzR Ratzz

        @SGaist
        I already have a delete button which deletes entire row.

        RatzzR Offline
        RatzzR Offline
        Ratzz
        wrote on last edited by
        #30

        @mrjj
        The code you shared is working (group box).

        --Alles ist gut.

        mrjjM 1 Reply Last reply
        0
        • RatzzR Ratzz

          @mrjj
          The code you shared is working (group box).

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #31

          @Ratzz
          Ok. super.

          RatzzR 1 Reply Last reply
          0
          • mrjjM mrjj

            @Ratzz
            Ok. super.

            RatzzR Offline
            RatzzR Offline
            Ratzz
            wrote on last edited by
            #32

            @mrjj
            But now i can drag items from treeview as well as listview to pushbutton and groupbox. But i do not want the user to allow listview items to dragged to pushbutton/groupbox

            --Alles ist gut.

            mrjjM 1 Reply Last reply
            0
            • RatzzR Ratzz

              @mrjj
              But now i can drag items from treeview as well as listview to pushbutton and groupbox. But i do not want the user to allow listview items to dragged to pushbutton/groupbox

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #33

              @Ratzz
              Hmm maybe you can check with
              sender();
              in dragEnterEvent
              and if its the not a Treeview then reject the drop

              like

              QTreeView* theone= dynamic_cast<QTreeView*>(sender());
                 if( theone!= NULL ) 
                 { 
                    event->acceptProposedAction();
                 }
              
              RatzzR 1 Reply Last reply
              0
              • mrjjM mrjj

                @Ratzz
                Hmm maybe you can check with
                sender();
                in dragEnterEvent
                and if its the not a Treeview then reject the drop

                like

                QTreeView* theone= dynamic_cast<QTreeView*>(sender());
                   if( theone!= NULL ) 
                   { 
                      event->acceptProposedAction();
                   }
                
                RatzzR Offline
                RatzzR Offline
                Ratzz
                wrote on last edited by
                #34

                @mrjj
                I do not have dragEnterEvent event yet! . we have a custom event using dropMimeData .

                --Alles ist gut.

                mrjjM 1 Reply Last reply
                0
                • RatzzR Ratzz

                  @mrjj
                  I do not have dragEnterEvent event yet! . we have a custom event using dropMimeData .

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by mrjj
                  #35

                  @Ratzz
                  how does this custom event look like ?

                  and its not an options just to disable Drag from listview?

                  RatzzR 1 Reply Last reply
                  0
                  • mrjjM mrjj

                    @Ratzz
                    how does this custom event look like ?

                    and its not an options just to disable Drag from listview?

                    RatzzR Offline
                    RatzzR Offline
                    Ratzz
                    wrote on last edited by Ratzz
                    #36

                    @mrjj
                    All drag drop events are handled in this. I am not aware how Bec, previous programmer has done it.

                    bool MessageModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)
                    {
                        if(action == Qt::CopyAction)
                        {
                    //        QStringList format = data->formats();
                            QByteArray encodedData = data->data("application/x-qabstractitemmodeldatalist");
                            QDataStream stream(&encodedData, QIODevice::ReadOnly);
                            QMap<int,  QVariant> roleDataMap;
                    //        roleDataMap.setInsertInOrder(true);
                            QMap<int, QString> sortMsgs;
                    
                            while (!stream.atEnd())
                            {
                                int row, col;
                                stream >> row >> col >> roleDataMap;
                                QString tmp = roleDataMap.value(0).toString();
                                //MsgId1.append(tmp);
                                sortMsgs.insert(row,tmp);
                            }
                            QList < QString > MsgId1 = sortMsgs.values();
                    
                            if(parent.parent().isValid() && !parent.parent().parent().isValid())
                            {
                                QStandardItemModel::dropMimeData(data,action,row,column,parent);
                                emit addFrameMessageIds(parent.row(), -1, MsgId1);
                                return true;
                            }
                            if(parent.parent().parent().isValid() && column == -1)
                            {
                                QStandardItemModel::dropMimeData(data,action,parent.row() +1,column,parent.parent());
                                emit addFrameMessageIds(parent.parent().row(),parent.row() +1, MsgId1);
                                return true;
                            }
                            if(parent.parent().parent().isValid() && column == 0)
                            {
                                QStandardItemModel::dropMimeData(data,action,row,column,parent);
                                emit addFrameMessageIds(parent.row(), row, MsgId1);
                                return true;
                            }
                        }
                        else if(action == Qt::MoveAction)
                        {
                            if(!parent.isValid())
                            {
                                return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                            }
                            if(indexesLocal.parent().parent().isValid() && !parent.parent().isValid() && column == -1)
                            {
                                //Msg is dropped on major frame
                                return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                            }
                            if(indexesLocal.parent().parent().isValid() && !parent.parent().parent().isValid() && column == -1)
                            {
                                //Msg is dropped on minor frame
                                if(indexesLocal.parent().row() != parent.row())
                                {
                                    QStandardItemModel::dropMimeData(data,action,row,column,parent);
                                    emit moveFrameMessageIds(indexesLocal.parent().row(),parent.row(),indexesLocal.row(),-1);
                                    return true;
                                }
                                else
                                {
                                    QStandardItemModel::dropMimeData(data,action, 0 ,column,parent);
                                    emit moveFrameMessageIds(indexesLocal.parent().row(),parent.row(),indexesLocal.row(),0);
                                    return true;
                                }
                            }
                            if(indexesLocal.parent().parent().isValid() && parent.parent().parent().isValid() && column == -1)
                            {
                                //      Msg is dropped on another msg
                                QStandardItemModel::dropMimeData(data,action,parent.row()+1,column,parent.parent());
                                emit moveFrameMessageIds(indexesLocal.parent().row(),parent.parent().row(),indexesLocal.row(),parent.row()+1);
                                return true;
                            }
                            if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && !parent.parent().isValid() && column == -1)
                            {
                                //      Minor frame is dropped on Major frame
                                QStandardItemModel::dropMimeData(data,action,0,indexesLocal.column(),indexesLocal.parent());
                                emit moveFrame(indexesLocal.row(),0);
                                return true;
                            }
                            if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && parent.parent().isValid() && !(parent.parent().parent().isValid()) && column == -1)
                            {
                                // Minor frame is dropped on another minor frame
                                int pre = indexesLocal.row();
                                int cur = parent.row();
                                QStandardItemModel::dropMimeData(data,action,parent.row()+1,column,parent.parent());
                                emit moveFrame(indexesLocal.row(),parent.row());
                                return true;
                            }
                            if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && parent.parent().parent().isValid() && column == -1)
                            {
                                return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                                //      Minor frame is dropped on msg
                            }
                            if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && !parent.parent().isValid() && column == 0)
                            {
                                QStandardItemModel::dropMimeData(data,action,row,indexesLocal.column(),indexesLocal.parent());
                                emit moveFrame(indexesLocal.row(),row);
                                return true;
                                //      Minor frame is dropped after minor
                            }
                            if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && !parent.parent().parent().isValid() && column == 0)
                            {
                                return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                                //      Minor frame is dropped after msg
                            }
                            if(indexesLocal.parent().parent().isValid() && parent.isValid() && !parent.parent().isValid() && column == 0)
                            {
                                return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                                //      Msg is dropped after minor
                            }
                            if(indexesLocal.parent().parent().isValid() && parent.parent().isValid() && !parent.parent().parent().isValid() && column == 0)
                            {
                                QStandardItemModel::dropMimeData(data,action,row,parent.column(),parent);
                                emit moveFrameMessageIds(indexesLocal.parent().row(),parent.row(),indexesLocal.row(),row);
                                return true;
                                //      Msg is dropped after msg
                            }
                    }
                    }
                    

                    And one more thing. If i drag items to pushbutton/group box the listview count is not getting updated.. ex:if i have 5 items and drag 1 item to pushbutton_delete then the count will be 5 . if i manually press delete button now then the list is getting updated to 3.

                    --Alles ist gut.

                    mrjjM 1 Reply Last reply
                    0
                    • RatzzR Ratzz

                      @mrjj
                      All drag drop events are handled in this. I am not aware how Bec, previous programmer has done it.

                      bool MessageModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)
                      {
                          if(action == Qt::CopyAction)
                          {
                      //        QStringList format = data->formats();
                              QByteArray encodedData = data->data("application/x-qabstractitemmodeldatalist");
                              QDataStream stream(&encodedData, QIODevice::ReadOnly);
                              QMap<int,  QVariant> roleDataMap;
                      //        roleDataMap.setInsertInOrder(true);
                              QMap<int, QString> sortMsgs;
                      
                              while (!stream.atEnd())
                              {
                                  int row, col;
                                  stream >> row >> col >> roleDataMap;
                                  QString tmp = roleDataMap.value(0).toString();
                                  //MsgId1.append(tmp);
                                  sortMsgs.insert(row,tmp);
                              }
                              QList < QString > MsgId1 = sortMsgs.values();
                      
                              if(parent.parent().isValid() && !parent.parent().parent().isValid())
                              {
                                  QStandardItemModel::dropMimeData(data,action,row,column,parent);
                                  emit addFrameMessageIds(parent.row(), -1, MsgId1);
                                  return true;
                              }
                              if(parent.parent().parent().isValid() && column == -1)
                              {
                                  QStandardItemModel::dropMimeData(data,action,parent.row() +1,column,parent.parent());
                                  emit addFrameMessageIds(parent.parent().row(),parent.row() +1, MsgId1);
                                  return true;
                              }
                              if(parent.parent().parent().isValid() && column == 0)
                              {
                                  QStandardItemModel::dropMimeData(data,action,row,column,parent);
                                  emit addFrameMessageIds(parent.row(), row, MsgId1);
                                  return true;
                              }
                          }
                          else if(action == Qt::MoveAction)
                          {
                              if(!parent.isValid())
                              {
                                  return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                              }
                              if(indexesLocal.parent().parent().isValid() && !parent.parent().isValid() && column == -1)
                              {
                                  //Msg is dropped on major frame
                                  return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                              }
                              if(indexesLocal.parent().parent().isValid() && !parent.parent().parent().isValid() && column == -1)
                              {
                                  //Msg is dropped on minor frame
                                  if(indexesLocal.parent().row() != parent.row())
                                  {
                                      QStandardItemModel::dropMimeData(data,action,row,column,parent);
                                      emit moveFrameMessageIds(indexesLocal.parent().row(),parent.row(),indexesLocal.row(),-1);
                                      return true;
                                  }
                                  else
                                  {
                                      QStandardItemModel::dropMimeData(data,action, 0 ,column,parent);
                                      emit moveFrameMessageIds(indexesLocal.parent().row(),parent.row(),indexesLocal.row(),0);
                                      return true;
                                  }
                              }
                              if(indexesLocal.parent().parent().isValid() && parent.parent().parent().isValid() && column == -1)
                              {
                                  //      Msg is dropped on another msg
                                  QStandardItemModel::dropMimeData(data,action,parent.row()+1,column,parent.parent());
                                  emit moveFrameMessageIds(indexesLocal.parent().row(),parent.parent().row(),indexesLocal.row(),parent.row()+1);
                                  return true;
                              }
                              if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && !parent.parent().isValid() && column == -1)
                              {
                                  //      Minor frame is dropped on Major frame
                                  QStandardItemModel::dropMimeData(data,action,0,indexesLocal.column(),indexesLocal.parent());
                                  emit moveFrame(indexesLocal.row(),0);
                                  return true;
                              }
                              if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && parent.parent().isValid() && !(parent.parent().parent().isValid()) && column == -1)
                              {
                                  // Minor frame is dropped on another minor frame
                                  int pre = indexesLocal.row();
                                  int cur = parent.row();
                                  QStandardItemModel::dropMimeData(data,action,parent.row()+1,column,parent.parent());
                                  emit moveFrame(indexesLocal.row(),parent.row());
                                  return true;
                              }
                              if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && parent.parent().parent().isValid() && column == -1)
                              {
                                  return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                                  //      Minor frame is dropped on msg
                              }
                              if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && !parent.parent().isValid() && column == 0)
                              {
                                  QStandardItemModel::dropMimeData(data,action,row,indexesLocal.column(),indexesLocal.parent());
                                  emit moveFrame(indexesLocal.row(),row);
                                  return true;
                                  //      Minor frame is dropped after minor
                              }
                              if(indexesLocal.parent().isValid() && !(indexesLocal.parent().parent().isValid()) && !parent.parent().parent().isValid() && column == 0)
                              {
                                  return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                                  //      Minor frame is dropped after msg
                              }
                              if(indexesLocal.parent().parent().isValid() && parent.isValid() && !parent.parent().isValid() && column == 0)
                              {
                                  return QStandardItemModel::dropMimeData(data,action,indexesLocal.row(),indexesLocal.column(),indexesLocal.parent());
                                  //      Msg is dropped after minor
                              }
                              if(indexesLocal.parent().parent().isValid() && parent.parent().isValid() && !parent.parent().parent().isValid() && column == 0)
                              {
                                  QStandardItemModel::dropMimeData(data,action,row,parent.column(),parent);
                                  emit moveFrameMessageIds(indexesLocal.parent().row(),parent.row(),indexesLocal.row(),row);
                                  return true;
                                  //      Msg is dropped after msg
                              }
                      }
                      }
                      

                      And one more thing. If i drag items to pushbutton/group box the listview count is not getting updated.. ex:if i have 5 items and drag 1 item to pushbutton_delete then the count will be 5 . if i manually press delete button now then the list is getting updated to 3.

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #37

                      @Ratzz said:

                      But i do not want the user to allow listview items to dragged to pushbutton/groupbox

                      So why can you not check there ?

                      also
                      http://doc.qt.io/qt-5/qtreewidget.html#dropMimeData
                      Seems to be when something is dropped on Tree and im confused what it has to do with the
                      Groupbox ?

                      RatzzR 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        @Ratzz said:

                        But i do not want the user to allow listview items to dragged to pushbutton/groupbox

                        So why can you not check there ?

                        also
                        http://doc.qt.io/qt-5/qtreewidget.html#dropMimeData
                        Seems to be when something is dropped on Tree and im confused what it has to do with the
                        Groupbox ?

                        RatzzR Offline
                        RatzzR Offline
                        Ratzz
                        wrote on last edited by
                        #38

                        @mrjj
                        Since the groupbox is deletes item as you suggested it also deletes listview items when dragged.

                        --Alles ist gut.

                        mrjjM 1 Reply Last reply
                        0
                        • RatzzR Ratzz

                          @mrjj
                          Since the groupbox is deletes item as you suggested it also deletes listview items when dragged.

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #39

                          @Ratzz
                          And the DragGBox do have
                          void dragEnterEvent(QDragEnterEvent* event) {
                          event->acceptProposedAction();
                          }

                          So why cant you just check that sender if the accepted one and then acccept or if not then
                          reject the drop?

                          RatzzR 1 Reply Last reply
                          0
                          • mrjjM mrjj

                            @Ratzz
                            And the DragGBox do have
                            void dragEnterEvent(QDragEnterEvent* event) {
                            event->acceptProposedAction();
                            }

                            So why cant you just check that sender if the accepted one and then acccept or if not then
                            reject the drop?

                            RatzzR Offline
                            RatzzR Offline
                            Ratzz
                            wrote on last edited by
                            #40

                            @mrjj
                            dragEnterEvent shoud be used for main class?

                            --Alles ist gut.

                            mrjjM 1 Reply Last reply
                            0
                            • RatzzR Ratzz

                              @mrjj
                              dragEnterEvent shoud be used for main class?

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #41

                              @mrjj said:
                              For the DropGroupBox class.
                              I assume you use that one?

                              RatzzR 1 Reply Last reply
                              0
                              • mrjjM mrjj

                                @mrjj said:
                                For the DropGroupBox class.
                                I assume you use that one?

                                RatzzR Offline
                                RatzzR Offline
                                Ratzz
                                wrote on last edited by Ratzz
                                #42

                                @mrjj
                                yes i have used this one.
                                Since its different class how to pull the sender to it?
                                can you just drop me some piece of code.

                                --Alles ist gut.

                                1 Reply Last reply
                                0
                                • ? Guest
                                  RatzzR Offline
                                  RatzzR Offline
                                  Ratzz
                                  wrote on last edited by
                                  #43

                                  @mrjj
                                  Not it does not allow even the treeview items to drop

                                  --Alles ist gut.

                                  1 Reply Last reply
                                  0
                                  • ? Guest
                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #44

                                    STOP
                                    sender() not working for events it seems.
                                    So cannot work.
                                    So its a no go.

                                    RatzzR 1 Reply Last reply
                                    0
                                    • mrjjM mrjj

                                      STOP
                                      sender() not working for events it seems.
                                      So cannot work.
                                      So its a no go.

                                      RatzzR Offline
                                      RatzzR Offline
                                      Ratzz
                                      wrote on last edited by
                                      #45

                                      @mrjj
                                      ok fine.. what next?!

                                      --Alles ist gut.

                                      mrjjM 1 Reply Last reply
                                      0
                                      • RatzzR Ratzz

                                        @mrjj
                                        ok fine.. what next?!

                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #46

                                        @Ratzz
                                        you can use
                                        QWidget * QDropEvent::source() const

                                        read here
                                        http://doc.qt.io/qt-5.5/qdropevent.html#source

                                        RatzzR 1 Reply Last reply
                                        0
                                        • mrjjM mrjj

                                          @Ratzz
                                          you can use
                                          QWidget * QDropEvent::source() const

                                          read here
                                          http://doc.qt.io/qt-5.5/qdropevent.html#source

                                          RatzzR Offline
                                          RatzzR Offline
                                          Ratzz
                                          wrote on last edited by
                                          #47

                                          @mrjj
                                          this way?

                                              void dragEnterEvent(QDragEnterEvent* event) {
                                                  QWidget * theone= dynamic_cast<QWidget*>(event->source());
                                                  if( theone == NULL )
                                                  {
                                                      event->acceptProposedAction();
                                                  }
                                              }

                                          --Alles ist gut.

                                          mrjjM 1 Reply Last reply
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