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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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  • mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by mrjj
    #17

    Hi you have to use the Dropbutton also.

    That is why I though using Mainwindow would be easier.

    Best way to do that is to use the promote feature.

    1. save the code in a file called dropbutton.h
      (just to be safe, also create dropbutton.cpp as empty)
    2. right click on your button you want to be a drop button.
      Select "Promote To..."
      In "Promoted classname" type
      DropButton
      (case Matters!)
      in
      header file : type
      dropbutton.h
      Then click "Add" and then Promote.
      Now when you run the program, the normal buttons becomes the DropButton.
    1 Reply Last reply
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    • C Offline
      C Offline
      ClapCreative
      wrote on last edited by
      #18

      Thanks mates

      Try us out ClapCreative.com is a professional SEO company Los Angeles offering quality SEO/PPC Services. Contact us info@clapcreative.com or +13238632896

      1 Reply Last reply
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      • RatzzR Offline
        RatzzR Offline
        Ratzz
        wrote on last edited by
        #19

        @mrjj
        Yes, i Tried you code which turns out to be a Dropbutton. How to implement it in my code ?

        --Alles ist gut.

        mrjjM 1 Reply Last reply
        0
        • RatzzR Ratzz

          @mrjj
          Yes, i Tried you code which turns out to be a Dropbutton. How to implement it in my code ?

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #20

          @Ratzz
          As I wrote in answer ?
          Using the promote feature.
          Which will runtime replace a normal button with the DropButton.
          Or you can new a button you self
          Like
          Dropbutton *but=Dropbutton (this)
          and insert into your window/layout.

          RatzzR 1 Reply Last reply
          0
          • mrjjM mrjj

            @Ratzz
            As I wrote in answer ?
            Using the promote feature.
            Which will runtime replace a normal button with the DropButton.
            Or you can new a button you self
            Like
            Dropbutton *but=Dropbutton (this)
            and insert into your window/layout.

            RatzzR Offline
            RatzzR Offline
            Ratzz
            wrote on last edited by
            #21

            @mrjj
            Yes its working now fine..
            I have group box adjacent to treeview. Can i implement the same to groupbox?

            --Alles ist gut.

            mrjjM 1 Reply Last reply
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            • RatzzR Ratzz

              @mrjj
              Yes its working now fine..
              I have group box adjacent to treeview. Can i implement the same to groupbox?

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by mrjj
              #22

              @Ratzz
              Super.
              Well If you promote the GroupBox, there might be issue with
              Parent. I have never tried it.
              Try it :)
              If it says funny stuff , just demote it to a groupbox again.

              Else its pretty much the same, except new filename and new name.

              #include <QGroupBox>
              #include <QDragMoveEvent>
              
              class DropGroupBox : public QGroupBox {
                Q_OBJECT
               public:
                explicit  DropGroupBox(QWidget* parent = 0) : QGroupBox(parent) {
                  setAcceptDrops(true);
                }
               protected:
                void dragEnterEvent(QDragEnterEvent* event) {
                  event->acceptProposedAction();
                }
              
                void dropEvent(QDropEvent* event) {
                  event->setDropAction(Qt::MoveAction);
                  event->accept();
                }
              };
              
              RatzzR 1 Reply Last reply
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              • mrjjM mrjj

                @Ratzz
                Super.
                Well If you promote the GroupBox, there might be issue with
                Parent. I have never tried it.
                Try it :)
                If it says funny stuff , just demote it to a groupbox again.

                Else its pretty much the same, except new filename and new name.

                #include <QGroupBox>
                #include <QDragMoveEvent>
                
                class DropGroupBox : public QGroupBox {
                  Q_OBJECT
                 public:
                  explicit  DropGroupBox(QWidget* parent = 0) : QGroupBox(parent) {
                    setAcceptDrops(true);
                  }
                 protected:
                  void dragEnterEvent(QDragEnterEvent* event) {
                    event->acceptProposedAction();
                  }
                
                  void dropEvent(QDropEvent* event) {
                    event->setDropAction(Qt::MoveAction);
                    event->accept();
                  }
                };
                
                RatzzR Offline
                RatzzR Offline
                Ratzz
                wrote on last edited by Ratzz
                #23

                @mrjj
                i promoted the group using Qpushbutton but not allow me to promote the GroupBox. so i added dropgroupBox.h and promoted it.
                But its not working.

                --Alles ist gut.

                mrjjM 1 Reply Last reply
                0
                • RatzzR Ratzz

                  @mrjj
                  i promoted the group using Qpushbutton but not allow me to promote the GroupBox. so i added dropgroupBox.h and promoted it.
                  But its not working.

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #24

                  @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 1 Reply Last reply
                  0
                  • 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
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