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My table does't not dynamic update.

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  • A Offline
    A Offline
    architect23
    wrote on last edited by
    #6

    I solved my problem:
    before beginInsertRows(), I set beginResetModel() and after endInsertRows(), I set endResetModel()

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    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by Christian Ehrlicher
      #7

      This is no solution but a hacky workaround... You should better fix your problem instead.

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      • A Offline
        A Offline
        architect23
        wrote on last edited by
        #8

        No problem, help me:)

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        • Christian EhrlicherC Offline
          Christian EhrlicherC Offline
          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on last edited by Christian Ehrlicher
          #9

          You don't post valid, compileable code, how should we help?
          This problem could be stripped down to maybe 50 lines of code. If you provide it and it still does not work we might be able to help.

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          • JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by
            #10

            As @Christian-Ehrlicher says. Start by checking your row number parameters to beginInsertRows() and which of the two models you are inserting into.

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            • A Offline
              A Offline
              architect23
              wrote on last edited by
              #11

              On the contrary, I just gave a piece of code where a sorting model was created and some methods were applied to it. If something was missing, then I expected to hear this: why do you need my entire code? No one will look at it.

              Christian EhrlicherC 1 Reply Last reply
              0
              • A architect23

                On the contrary, I just gave a piece of code where a sorting model was created and some methods were applied to it. If something was missing, then I expected to hear this: why do you need my entire code? No one will look at it.

                Christian EhrlicherC Offline
                Christian EhrlicherC Offline
                Christian Ehrlicher
                Lifetime Qt Champion
                wrote on last edited by
                #12

                @architect23 said in My table does't not dynamic update.:

                No one will look at it.

                Correct, therefore I requested a minimal, compilable example - as I already wrote I would guess it's not more than 50 lines of code.
                The code you gave told us only that you create a local QSortFilterProxyModel which will be destructed on function exit. Also you did not show use where and how you update the data...

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

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                • A Offline
                  A Offline
                  architect23
                  wrote on last edited by
                  #13

                  Can you give me simple example for dynamic sort?

                  Pl45m4P 1 Reply Last reply
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                  • A architect23

                    Can you give me simple example for dynamic sort?

                    Pl45m4P Offline
                    Pl45m4P Offline
                    Pl45m4
                    wrote on last edited by
                    #14

                    @architect23

                    https://doc.qt.io/qt-6/qtwidgets-itemviews-customsortfiltermodel-example.html


                    If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                    ~E. W. Dijkstra

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                    • A Offline
                      A Offline
                      architect23
                      wrote on last edited by
                      #15
                      		QVariant lhs_data = model->data(left, Qt::DisplayRole);<-------------- 0.00
                      		QVariant rhs_data = model->data(right, Qt::DisplayRole);<--------------5.37
                      

                      In first string I always get zero, I don't understand why?

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

                        This example works fine for me, prove us that there is an error in Qt:

                        int main(int argc, char* argv[])
                        {
                        	QApplication app(argc, argv);
                        	QTableView tv;
                        	tv.setSortingEnabled(true);
                        	auto model = new QStandardItemModel;
                        	for (int i = 0; i < 10; ++i)
                        		model->appendRow(new QStandardItem(QString::number(i + 1)));
                        	auto proxy = new QSortFilterProxyModel;
                        	proxy->setSourceModel(model);
                        	proxy->sort(0);
                        	proxy->setDynamicSortFilter(true);
                        	QTimer t;
                        	t.start(1000);
                        	auto rand = QRandomGenerator::global();
                        	QObject::connect(&t, &QTimer::timeout, [&]() {
                        		int row = rand->bounded(0, 9);
                        		auto item = model->item(row);
                        		item->setText(QString::number(rand->bounded(1, 200)));
                        	});
                        	tv.setModel(proxy);
                        	tv.show();
                        	return app.exec();
                        }
                        

                        Attention: It sorts by DisplayRole so "123" < "80"

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                        • A architect23
                          		QVariant lhs_data = model->data(left, Qt::DisplayRole);<-------------- 0.00
                          		QVariant rhs_data = model->data(right, Qt::DisplayRole);<--------------5.37
                          

                          In first string I always get zero, I don't understand why?

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #17

                          @architect23

                          In first string I always get zero, I don't understand why?

                          Depends what data you have in model->data(left), which nobody but you knows, and for that matter which model model refers to. How should anyone answer?

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                          • A Offline
                            A Offline
                            architect23
                            wrote on last edited by architect23
                            #18

                            I solved my problem, no dynamic sort because no data yet, but I don't understand I have two string with two function:
                            function1()
                            function2()
                            in function1():

                            beginInsertRows(model_index, parent_filter->rowCount(), parent_filter->rowCount());
                            	parent_filter->InsertChild(filterNode);
                            	endInsertRows();
                            

                            and it callback function lessThan()-OK
                            in function2():

                            beginInsertRows(model_index, parent_filter->rowCount(), parent_filter->rowCount());
                            	parent_filter->InsertChild(new_row);
                            	endInsertRows();
                            

                            but it did't callback lessThan() after endInsertRows()-why?????

                            JonBJ 1 Reply Last reply
                            0
                            • A architect23

                              I solved my problem, no dynamic sort because no data yet, but I don't understand I have two string with two function:
                              function1()
                              function2()
                              in function1():

                              beginInsertRows(model_index, parent_filter->rowCount(), parent_filter->rowCount());
                              	parent_filter->InsertChild(filterNode);
                              	endInsertRows();
                              

                              and it callback function lessThan()-OK
                              in function2():

                              beginInsertRows(model_index, parent_filter->rowCount(), parent_filter->rowCount());
                              	parent_filter->InsertChild(new_row);
                              	endInsertRows();
                              

                              but it did't callback lessThan() after endInsertRows()-why?????

                              JonBJ Offline
                              JonBJ Offline
                              JonB
                              wrote on last edited by JonB
                              #19

                              @architect23
                              Since the code is identical the difference must come from either the value of filterNode versus new_row or the content of the node pointed to by parent_filter.

                              Maybe lessThan(), which is needed for sorting, is not called because e.g. parent_filter has no children in one case so it does not need to compare to sort?

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