Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. [SOLVED]How to delete an item from the treeview by droping an item to pushbutton or to an group box
Forum Updated to NodeBB v4.3 + New Features

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

Scheduled Pinned Locked Moved General and Desktop
drag and droptreeview
54 Posts 4 Posters 23.3k Views 3 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #25

    Out of curiosity… Why are you creating so many widgets that should allow to delete items from your view using dnd ? It doesn't feel very intuitive nor following the guidelines of major OSs

    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
    • mrjjM mrjj

      @Ratzz
      Hi
      Something must gone wrong. maybe.
      Tried it here and it does accept drops

      https://www.dropbox.com/s/7bkqatzm6vt1kmz/promotedgb.zip?dl=0

      RatzzR Offline
      RatzzR Offline
      Ratzz
      wrote on last edited by Ratzz
      #26

      @mrjj
      Yes your code is working . But do not know in my case its not working .
      You have used Listwidget and i have used list view . Does it matters??

      --Alles ist gut.

      1 Reply Last reply
      0
      • SGaistS SGaist

        Out of curiosity… Why are you creating so many widgets that should allow to delete items from your view using dnd ? It doesn't feel very intuitive nor following the guidelines of major OSs

        RatzzR Offline
        RatzzR Offline
        Ratzz
        wrote on last edited by
        #27

        @SGaist
        Yes , My treeview is in between listview and groupbox . even if the listview items are dragged to the pushbutton_delete its getting deleted. which in my case should not. what is the best way to do ??

        --Alles ist gut.

        1 Reply Last reply
        0
        • 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

                                          • Login

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Categories
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups
                                          • Search
                                          • Get Qt Extensions
                                          • Unsolved