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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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  • 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
                                0
                                • RatzzR Ratzz

                                  @mrjj
                                  this way?

                                      void dragEnterEvent(QDragEnterEvent* event) {
                                          QWidget * theone= dynamic_cast<QWidget*>(event->source());
                                          if( theone == NULL )
                                          {
                                              event->acceptProposedAction();
                                          }
                                      }
                                  mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on last edited by mrjj
                                  #48

                                  @Ratzz
                                  almost but must be the type you want to allow
                                  QTreeView * theone= dynamic_cast<QTreeView*>(event->source());
                                  if( theone != NULL )
                                  {
                                  event->acceptProposedAction();
                                  }

                                  so it says if it IS a Treeview then say ok
                                  For other types, it should not allow then. (red sign)
                                  I hope :)

                                  1 Reply Last reply
                                  0
                                  • RatzzR Offline
                                    RatzzR Offline
                                    Ratzz
                                    wrote on last edited by Ratzz
                                    #49

                                    @mrjj
                                    yes its working fine :)
                                    i should implement for Pushbutton also .

                                    --Alles ist gut.

                                    mrjjM 1 Reply Last reply
                                    0
                                    • RatzzR Ratzz

                                      @mrjj
                                      yes its working fine :)
                                      i should implement for Pushbutton also .

                                      mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #50

                                      @Ratzz
                                      Super :)

                                      RatzzR 1 Reply Last reply
                                      0
                                      • mrjjM mrjj

                                        @Ratzz
                                        Super :)

                                        RatzzR Offline
                                        RatzzR Offline
                                        Ratzz
                                        wrote on last edited by
                                        #51

                                        @mrjj
                                        when i click delete button i do ui->label->setText(QString::number(parent->rowCount())); which gives me count of the number of rows. But if i drag the row will be deleted but count is not getting updated. how to update it ?
                                        Should it be done on GroupDropBox??

                                        --Alles ist gut.

                                        mrjjM 1 Reply Last reply
                                        0
                                        • RatzzR Ratzz

                                          @mrjj
                                          when i click delete button i do ui->label->setText(QString::number(parent->rowCount())); which gives me count of the number of rows. But if i drag the row will be deleted but count is not getting updated. how to update it ?
                                          Should it be done on GroupDropBox??

                                          mrjjM Offline
                                          mrjjM Offline
                                          mrjj
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #52

                                          @Ratzz
                                          GroupBox would not know about parent.
                                          The Tree should update when the It is removed.

                                          But then you drag, do you call the buttons on_click so the
                                          ui->label->setText(QString::number(parent->rowCount()))
                                          is executed ?
                                          The groupBox example does not call anything as the Tree removes the item it self so
                                          I assume that is why you dont see Count Changes.

                                          mrjjM 1 Reply Last reply
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