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QTreeWidget with LineEdit to filter and search element in my tree

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  • C coilo

    Hello guys,

    I am new to the world of Qt. I am trying to do a filter for my QTreeWidget. I have a list of items in my tree and I would like to use a search input (with a LineEdit) to find my item from my list.
    Here the pic of my GUI so that you can better understand :

    So when I write a letter in my LineEdit i would like to show only items who started with this letter.
    But unfortunately i have no idea how to deal with it.

    If someone can help me, thank you very much.

    CP71C Offline
    CP71C Offline
    CP71
    wrote on last edited by CP71
    #2

    @coilo
    Hi.
    Never done!
    As the first idea I think:

    QList<QTreeWidgetItem*> list;

    list = MyQTreeWidget->findChildren<QTreeWidgetItem*>();

    Then foreach in the list to find text that contains your substring, then select QTreeWidgetItem

    Unique doubt, I'm not sure that list has the correct order, you must check

    C 1 Reply Last reply
    1
    • VRoninV Offline
      VRoninV Offline
      VRonin
      wrote on last edited by
      #3

      Instead of using QTreeWidget split the model and the view (QStandardItemModel+QTreeView)
      Then you can just use a QSortFilterProxyModel in-between to do the filtering

      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
      ~Napoleon Bonaparte

      On a crusade to banish setIndexWidget() from the holy land of Qt

      C 1 Reply Last reply
      4
      • CP71C CP71

        @coilo
        Hi.
        Never done!
        As the first idea I think:

        QList<QTreeWidgetItem*> list;

        list = MyQTreeWidget->findChildren<QTreeWidgetItem*>();

        Then foreach in the list to find text that contains your substring, then select QTreeWidgetItem

        Unique doubt, I'm not sure that list has the correct order, you must check

        C Offline
        C Offline
        coilo
        wrote on last edited by
        #4

        @CP71
        Hmmm i am going to try your solution ! Thanks for the help

        CP71C 1 Reply Last reply
        1
        • VRoninV VRonin

          Instead of using QTreeWidget split the model and the view (QStandardItemModel+QTreeView)
          Then you can just use a QSortFilterProxyModel in-between to do the filtering

          C Offline
          C Offline
          coilo
          wrote on last edited by
          #5

          @VRonin
          The problem is that I have already used this tree for other functions. So I would like to avoid redoing everything and keep the QTreeWidget format. But yeah you're right, I don't think that the QtreeWidget format is the most appropriate :(

          1 Reply Last reply
          0
          • C coilo

            @CP71
            Hmmm i am going to try your solution ! Thanks for the help

            CP71C Offline
            CP71C Offline
            CP71
            wrote on last edited by
            #6

            @coilo
            You are welcome.
            Please, write the result of your test, so I know if it is a good way for future
            Thanks

            C 1 Reply Last reply
            1
            • CP71C CP71

              @coilo
              You are welcome.
              Please, write the result of your test, so I know if it is a good way for future
              Thanks

              C Offline
              C Offline
              coilo
              wrote on last edited by
              #7

              @CP71
              Yes of course no problem !
              But i have some issues here, i am a beginner with Qt, i am trying your solution the function contains does not exist with QTreeWidgetItem.
              Here is my code :

              void MainWindow::on_lineEdit_textChanged(const QString &arg1)
              {
              QList<QTreeWidgetItem*> list;
              list= ui->treeWidget->findChildren<QTreeWidgetItem*>();

              foreach (QTreeWidgetItem* myitem,list)
              {
                  if(myitem->contains(arg1))
                  { 
                      list.append(myitem);
                  }
              }
              

              }

              Thanks again ! =)

              CP71C 1 Reply Last reply
              0
              • C coilo

                @CP71
                Yes of course no problem !
                But i have some issues here, i am a beginner with Qt, i am trying your solution the function contains does not exist with QTreeWidgetItem.
                Here is my code :

                void MainWindow::on_lineEdit_textChanged(const QString &arg1)
                {
                QList<QTreeWidgetItem*> list;
                list= ui->treeWidget->findChildren<QTreeWidgetItem*>();

                foreach (QTreeWidgetItem* myitem,list)
                {
                    if(myitem->contains(arg1))
                    { 
                        list.append(myitem);
                    }
                }
                

                }

                Thanks again ! =)

                CP71C Offline
                CP71C Offline
                CP71
                wrote on last edited by
                #8

                @coilo
                try
                https://doc.qt.io/qt-5/qtreewidgetitem.html#text

                1 Reply Last reply
                1
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #9

                  Hi,

                  For the searching part, no need to complicate stuff, QTreeWidget has you covered with findItems.

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

                  CP71C 1 Reply Last reply
                  1
                  • SGaistS SGaist

                    Hi,

                    For the searching part, no need to complicate stuff, QTreeWidget has you covered with findItems.

                    CP71C Offline
                    CP71C Offline
                    CP71
                    wrote on last edited by CP71
                    #10

                    @coilo
                    as @SGaist says

                    https://stackoverflow.com/questions/29694416/qtreewidgetitem-find-child-by-text

                    I'm sure that my first idea is not a good way! :(

                    1 Reply Last reply
                    1
                    • C Offline
                      C Offline
                      coilo
                      wrote on last edited by coilo
                      #11
                      This post is deleted!
                      JonBJ 1 Reply Last reply
                      0
                      • C coilo

                        This post is deleted!

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by
                        #12

                        @coilo said in QTreeWidget with LineEdit to filter and search element in my tree:

                        ui->treeWidget->clear(); //i would like to delete all element (but only the view not the data)

                        You won't be able to do this. In a QTreeWidget it manages the data and the displayed items itself, you cannot have one without the other. As someone said earlier, the best way to really do this is with your own QTreeView plus a QSortFilterProxyModel, which would achieve what you want, but you have said you have reasons for not wanting to change over.

                        If you are going to stick with your QTreeWidget you will need to clear its current members and then re-add the desired new items from sublist into your ui->treeWidget, not just call ui->treeWidget->setCurrentItem() (which only selects an existing item already in a QTreeWidget).

                        Note also: you find items recursively, but you only produce a "flat" sublist. If doing it this way you will need to code whatever to re-add the old items in the correct hierarchy/parentage.

                        1 Reply Last reply
                        2
                        • VRoninV Offline
                          VRoninV Offline
                          VRonin
                          wrote on last edited by VRonin
                          #13

                          Disclaimer

                          This is not the advised solution, the correct one is to use QStandardItemModel+QSortFilterProxyModel+QTreeView.


                          Since you are already hacking, might as well hack properly.

                          • Create a QTreeView right next to your QTreeWidget.
                          • Add a private QSortFilterProxyModel* m_proxy; member to MainWindow
                          • in the MainWindow constructor add:
                          m_proxy  = new QSortFilterProxyModel(this);
                          m_proxy->setSourceModel(ui->treeWidget->model());
                          ui->treeView->setModel(m_proxy);
                          ui->treeWidget->hide();
                          
                          • on_lineEdit_textChanged becomes:
                          void MainWindow::on_lineEdit_textChanged(const QString &arg1)
                          {
                              m_proxy->setFilterRegularExpression(arg1);
                          }
                          

                          "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                          ~Napoleon Bonaparte

                          On a crusade to banish setIndexWidget() from the holy land of Qt

                          1 Reply Last reply
                          4
                          • C Offline
                            C Offline
                            coilo
                            wrote on last edited by
                            #14

                            Hmmm ok i tried what you suggested me and it works yeah ! But i will consider changing my QTreeWidget into QStandardItemModel+QSortFilterProxyModel+QTreeView to do it properly in the future.

                            Thanks a lot guys !

                            1 Reply Last reply
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