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How to hide/show all rows?(QTablewidget)

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  • S Slawomir_Piernikowski

    If you want to see only some of the rows or none you can implement QSortFilterProxyModel and filter data.

    EngelardE Offline
    EngelardE Offline
    Engelard
    wrote on last edited by Engelard
    #6

    @Slawomir_Piernikowski said in How to hide/show all rows?(QTablewidget):

    you can implement QSortFilterProxyModel

    I read manual in documentation, it assume that i should use function setModel(); to my tabWidget, but this function is private, and since my tabWidget is made in ui(Designer), i can't remake whole app, create new class just for inheritance, to much code should be repaired.

    Is there any other way to do something else, or at least access that private function?

    P.S. why this function even private... Such an obstacle for me now.

    mrjjM S 2 Replies Last reply
    0
    • EngelardE Engelard

      @Slawomir_Piernikowski said in How to hide/show all rows?(QTablewidget):

      you can implement QSortFilterProxyModel

      I read manual in documentation, it assume that i should use function setModel(); to my tabWidget, but this function is private, and since my tabWidget is made in ui(Designer), i can't remake whole app, create new class just for inheritance, to much code should be repaired.

      Is there any other way to do something else, or at least access that private function?

      P.S. why this function even private... Such an obstacle for me now.

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #7

      @Engelard
      Hi
      its private as QTablewidget uses a inner model.
      The Widgets version is just a wrapper for the View version.
      You could use
      QTableView with a QStandardItemModel instead.
      Code is also most the same, except you will add the Items to the model and not
      directly to Table.

      EngelardE 1 Reply Last reply
      1
      • mrjjM mrjj

        @Engelard
        Hi
        its private as QTablewidget uses a inner model.
        The Widgets version is just a wrapper for the View version.
        You could use
        QTableView with a QStandardItemModel instead.
        Code is also most the same, except you will add the Items to the model and not
        directly to Table.

        EngelardE Offline
        EngelardE Offline
        Engelard
        wrote on last edited by Engelard
        #8

        @mrjj Can you pls write some crucial lines which i should add? I really can't understand this concept of model and hardly understand the half of what you said))

        mrjjM 1 Reply Last reply
        0
        • EngelardE Engelard

          @mrjj Can you pls write some crucial lines which i should add? I really can't understand this concept of model and hardly understand the half of what you said))

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by mrjj
          #9

          @Engelard
          There is sample here
          https://stackoverflow.com/questions/18964377/using-qtableview-with-a-model
          THey use a custom model
          class VehicleModel : public QAbstractTableModel

          You can just use
          http://doc.qt.io/qt-5/qstandarditemmodel.html
          It looks worse than it is.

          Basically you can do ( to add a row of data to the model)

          QList<QStandardItem *> items;
          
          items.append(new QStandardItem("Column 1 Text"));
          items.append(new QStandardItem("Column 2 Text"));
          
          QStandardItemModel* model = new QStandardItemModel(this);
          
          model->setColumnCount(2);
          model->appendRow(items);
          

          and set model to TableView.
          This is the same as when you addItem to the TableWidget.

          They then use setFilterFixedString ( on the QSortFilterProxyModel ) to filter the model.

          EngelardE 1 Reply Last reply
          6
          • EngelardE Engelard

            @Slawomir_Piernikowski said in How to hide/show all rows?(QTablewidget):

            you can implement QSortFilterProxyModel

            I read manual in documentation, it assume that i should use function setModel(); to my tabWidget, but this function is private, and since my tabWidget is made in ui(Designer), i can't remake whole app, create new class just for inheritance, to much code should be repaired.

            Is there any other way to do something else, or at least access that private function?

            P.S. why this function even private... Such an obstacle for me now.

            S Offline
            S Offline
            Slawomir_Piernikowski
            wrote on last edited by Slawomir_Piernikowski
            #10

            @Engelard
            It is always like this. Some widgets has some limitaions like for example private member to which there is no access without inheritens. In your case if you have such a problem it would be better to try to know QTableView and how works Model-View-Controlle.
            There is plenty articles but the best is Qt help documentation.
            Go to qt help and write in the search line: Model. next choose "Model/View Tutorial"

            1 Reply Last reply
            0
            • mrjjM mrjj

              @Engelard
              There is sample here
              https://stackoverflow.com/questions/18964377/using-qtableview-with-a-model
              THey use a custom model
              class VehicleModel : public QAbstractTableModel

              You can just use
              http://doc.qt.io/qt-5/qstandarditemmodel.html
              It looks worse than it is.

              Basically you can do ( to add a row of data to the model)

              QList<QStandardItem *> items;
              
              items.append(new QStandardItem("Column 1 Text"));
              items.append(new QStandardItem("Column 2 Text"));
              
              QStandardItemModel* model = new QStandardItemModel(this);
              
              model->setColumnCount(2);
              model->appendRow(items);
              

              and set model to TableView.
              This is the same as when you addItem to the TableWidget.

              They then use setFilterFixedString ( on the QSortFilterProxyModel ) to filter the model.

              EngelardE Offline
              EngelardE Offline
              Engelard
              wrote on last edited by Engelard
              #11

              @mrjj said in How to hide/show all rows?(QTablewidget):

              and set model to TableView.

              told u i can't set it because it's private)

              Correct answer from Slawomir_Piernikowski , but will do so next time. Good lesson that was, every time when will create some huge/important widget - will do that only through manual creation of additional class with inheritance. No fast creation by hands with Designer anymore.

              mrjjM S 2 Replies Last reply
              0
              • EngelardE Engelard

                @mrjj said in How to hide/show all rows?(QTablewidget):

                and set model to TableView.

                told u i can't set it because it's private)

                Correct answer from Slawomir_Piernikowski , but will do so next time. Good lesson that was, every time when will create some huge/important widget - will do that only through manual creation of additional class with inheritance. No fast creation by hands with Designer anymore.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #12

                @Engelard
                "set model to TableView" -> TableVIEW allows setModel :)
                You are using the Widget version. which dont allow it.

                • No fast creation by hands with Designer anymore.

                It has nothing to do with Designer. :)
                TableWidget is simply slow with that many items and your method of hiding rows
                You can insert a TableView in designer too.

                So its not about using Designer or not.
                You can even use designer with custom classes too.
                So even if you decide you need a custom class. There is nothing stopping you for using
                Designer for some of the forms and then insert classes from code also.

                So it was more that the class used could not fulfill the requirements of 100K rows and show hide them. :)
                And yes, that came around as it was fast and easy to use TableWidget. and its meant to
                be easy to use. However, ease of use comes with a price in this case.

                EngelardE 2 Replies Last reply
                4
                • EngelardE Engelard

                  @mrjj said in How to hide/show all rows?(QTablewidget):

                  and set model to TableView.

                  told u i can't set it because it's private)

                  Correct answer from Slawomir_Piernikowski , but will do so next time. Good lesson that was, every time when will create some huge/important widget - will do that only through manual creation of additional class with inheritance. No fast creation by hands with Designer anymore.

                  S Offline
                  S Offline
                  Slawomir_Piernikowski
                  wrote on last edited by Slawomir_Piernikowski
                  #13

                  @Engelard
                  Do not be disappointed. All widgets are only classes and you use them to create objects.
                  So it is only about object orientated programming. You have to get to know methods in classes and how to use them. But it takes some time.......but after you once write your soft it will be easier to use Model view control in your other project and then it will not take so much time.

                  1 Reply Last reply
                  0
                  • mrjjM mrjj

                    @Engelard
                    "set model to TableView" -> TableVIEW allows setModel :)
                    You are using the Widget version. which dont allow it.

                    • No fast creation by hands with Designer anymore.

                    It has nothing to do with Designer. :)
                    TableWidget is simply slow with that many items and your method of hiding rows
                    You can insert a TableView in designer too.

                    So its not about using Designer or not.
                    You can even use designer with custom classes too.
                    So even if you decide you need a custom class. There is nothing stopping you for using
                    Designer for some of the forms and then insert classes from code also.

                    So it was more that the class used could not fulfill the requirements of 100K rows and show hide them. :)
                    And yes, that came around as it was fast and easy to use TableWidget. and its meant to
                    be easy to use. However, ease of use comes with a price in this case.

                    EngelardE Offline
                    EngelardE Offline
                    Engelard
                    wrote on last edited by Engelard
                    #14

                    @mrjj said in How to hide/show all rows?(QTablewidget):

                    "set model to TableView" -> TableVIEW allows setModel :)

                    To much tables on this week, did'nt see exactly what you wrote) I Will try it.

                    UPDATE.

                    Read about tableView. There is so much to remake, replaced my tabWid with View, about 200 errors got, will take a day to remake whole app)) Or maybe more.

                    QTableView (and other Model/View widgets) is preferable for displaying a significant amount of data.

                    Well, did'nt know that when i started my app)

                    mrjjM 1 Reply Last reply
                    0
                    • EngelardE Engelard

                      @mrjj said in How to hide/show all rows?(QTablewidget):

                      "set model to TableView" -> TableVIEW allows setModel :)

                      To much tables on this week, did'nt see exactly what you wrote) I Will try it.

                      UPDATE.

                      Read about tableView. There is so much to remake, replaced my tabWid with View, about 200 errors got, will take a day to remake whole app)) Or maybe more.

                      QTableView (and other Model/View widgets) is preferable for displaying a significant amount of data.

                      Well, did'nt know that when i started my app)

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #15

                      @Engelard
                      well that 200 errors is mostly about same stuff i assume.
                      But yeah, switching to View can be a bit involving later.

                      Btw, you can try
                      ui->tableWidget->setUpdatesEnabled(false);
                      for loop with hiderow
                      ui->tableWidget->setUpdatesEnabled(true);
                      and see if that speed it up.
                      But changing to View version will make you more happy in the long run :)

                      1 Reply Last reply
                      0
                      • Christian EhrlicherC Offline
                        Christian EhrlicherC Offline
                        Christian Ehrlicher
                        Lifetime Qt Champion
                        wrote on last edited by
                        #16

                        @mrjj said in How to hide/show all rows?(QTablewidget):

                        Btw, you can try
                        ui->tableWidget->setUpdatesEnabled(false);
                        for loop with hiderow
                        ui->tableWidget->setUpdatesEnabled(true);
                        and see if that speed it up.

                        Will not help here - QHeaderView::setSectionHidden() doesn't care for such things and this is simply not meant to hide more than a few rows.

                        Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                        Visit the Qt Academy at https://academy.qt.io/catalog

                        mrjjM 1 Reply Last reply
                        2
                        • mrjjM mrjj

                          @Engelard
                          "set model to TableView" -> TableVIEW allows setModel :)
                          You are using the Widget version. which dont allow it.

                          • No fast creation by hands with Designer anymore.

                          It has nothing to do with Designer. :)
                          TableWidget is simply slow with that many items and your method of hiding rows
                          You can insert a TableView in designer too.

                          So its not about using Designer or not.
                          You can even use designer with custom classes too.
                          So even if you decide you need a custom class. There is nothing stopping you for using
                          Designer for some of the forms and then insert classes from code also.

                          So it was more that the class used could not fulfill the requirements of 100K rows and show hide them. :)
                          And yes, that came around as it was fast and easy to use TableWidget. and its meant to
                          be easy to use. However, ease of use comes with a price in this case.

                          EngelardE Offline
                          EngelardE Offline
                          Engelard
                          wrote on last edited by
                          #17

                          @mrjj said in How to hide/show all rows?(QTablewidget):

                          TableWidget is simply slow with that many items and your method of hiding rows

                          Why then TableWidget exist? Why they dont just left only View type, what can do tableWidget what can't View?

                          @mrjj said in How to hide/show all rows?(QTablewidget):

                          You can even use designer with custom classes too.

                          How. In my test program i created tableView in designer, how should i create new class for it? I rly can't get it, how it might be created from ui and my custom class simultaneously.

                          mrjjM 1 Reply Last reply
                          0
                          • EngelardE Engelard

                            @mrjj said in How to hide/show all rows?(QTablewidget):

                            TableWidget is simply slow with that many items and your method of hiding rows

                            Why then TableWidget exist? Why they dont just left only View type, what can do tableWidget what can't View?

                            @mrjj said in How to hide/show all rows?(QTablewidget):

                            You can even use designer with custom classes too.

                            How. In my test program i created tableView in designer, how should i create new class for it? I rly can't get it, how it might be created from ui and my custom class simultaneously.

                            mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by mrjj
                            #18

                            @Engelard
                            Hi
                            It exists for use cases with just a few hundred items and
                            is meant as a convenient class. ( it is a View with private model)

                            • how it might be created from ui and my custom class simultaneously.
                              You can use a feature of Creator called promotion.
                              http://doc.qt.io/qt-5/designer-using-custom-widgets.html
                              Think of it as runtime replace. You place say a normal Widget on the form.
                              and then promote it to your widget subclass. Then when run, its your class
                              instead of the default one.
                            EngelardE 1 Reply Last reply
                            1
                            • Christian EhrlicherC Christian Ehrlicher

                              @mrjj said in How to hide/show all rows?(QTablewidget):

                              Btw, you can try
                              ui->tableWidget->setUpdatesEnabled(false);
                              for loop with hiderow
                              ui->tableWidget->setUpdatesEnabled(true);
                              and see if that speed it up.

                              Will not help here - QHeaderView::setSectionHidden() doesn't care for such things and this is simply not meant to hide more than a few rows.

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #19

                              @Christian-Ehrlicher
                              Ah, i though HideRow was something else :)
                              So treeWidget->setUniformRowHeights(true);
                              will not speed anything up either i assume.

                              1 Reply Last reply
                              0
                              • mrjjM mrjj

                                @Engelard
                                Hi
                                It exists for use cases with just a few hundred items and
                                is meant as a convenient class. ( it is a View with private model)

                                • how it might be created from ui and my custom class simultaneously.
                                  You can use a feature of Creator called promotion.
                                  http://doc.qt.io/qt-5/designer-using-custom-widgets.html
                                  Think of it as runtime replace. You place say a normal Widget on the form.
                                  and then promote it to your widget subclass. Then when run, its your class
                                  instead of the default one.
                                EngelardE Offline
                                EngelardE Offline
                                Engelard
                                wrote on last edited by Engelard
                                #20

                                @mrjj said in How to hide/show all rows?(QTablewidget):

                                You can use a feature of Creator called promotion.

                                Hey nice feature. The only thing i don't like, is this message EVERY time i compile my project(brow.h is my mainWindow, main class if you wish):

                                0_1542560263077_cmonnn.jpg

                                And every time clicking yes yes yes...

                                1 Reply Last reply
                                0
                                • Christian EhrlicherC Offline
                                  Christian EhrlicherC Offline
                                  Christian Ehrlicher
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #21

                                  Then close the ui_brow.h - since it is generated it will be created on every compile.

                                  Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                                  Visit the Qt Academy at https://academy.qt.io/catalog

                                  1 Reply Last reply
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