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QComboBox - filtering by typing

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  • VRoninV VRonin

    Does this do what you want?

    #include <QApplication>
    #include <QStringListModel>
    #include <QPushButton>
    #include <QComboBox>
    #include <QSortFilterProxyModel>
    
    int main(int argc, char **argv) {
      QApplication app(argc, argv);
      QStringList modleList;
      for(int i=1;i<1000;++i)
      modleList <<  QStringLiteral("%1%2").arg(QLatin1Char('a'+(i%26))).arg(i,3,10,QLatin1Char('0'));
      QStringListModel model(modleList);
      QSortFilterProxyModel filterModel;
      filterModel.setSourceModel(&model);
      QComboBox w;
      w.setModel(&filterModel);
      w.setEditable(true);
      w.setCompleter(nullptr);
      QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
      w.show();
      app.exec();
      return 0;
    }
    
    M Offline
    M Offline
    michaeldev
    wrote on last edited by
    #14

    @VRonin said in QComboBox - filtering by typing:

    Does this do what you want?

    #include <QApplication>
    #include <QStringListModel>
    #include <QPushButton>
    #include <QComboBox>
    #include <QSortFilterProxyModel>
    
    int main(int argc, char **argv) {
      QApplication app(argc, argv);
      QStringList modleList;
      for(int i=1;i<1000;++i)
      modleList <<  QStringLiteral("%1%2").arg(QLatin1Char('a'+(i%26))).arg(i,3,10,QLatin1Char('0'));
      QStringListModel model(modleList);
      QSortFilterProxyModel filterModel;
      filterModel.setSourceModel(&model);
      QComboBox w;
      w.setModel(&filterModel);
      w.setEditable(true);
      w.setCompleter(nullptr);
      QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
      w.show();
      app.exec();
      return 0;
    }
    

    There isn't filtration by content. Am I wrong?

    kshegunovK JonBJ 2 Replies Last reply
    0
    • M michaeldev

      @VRonin said in QComboBox - filtering by typing:

      Does this do what you want?

      #include <QApplication>
      #include <QStringListModel>
      #include <QPushButton>
      #include <QComboBox>
      #include <QSortFilterProxyModel>
      
      int main(int argc, char **argv) {
        QApplication app(argc, argv);
        QStringList modleList;
        for(int i=1;i<1000;++i)
        modleList <<  QStringLiteral("%1%2").arg(QLatin1Char('a'+(i%26))).arg(i,3,10,QLatin1Char('0'));
        QStringListModel model(modleList);
        QSortFilterProxyModel filterModel;
        filterModel.setSourceModel(&model);
        QComboBox w;
        w.setModel(&filterModel);
        w.setEditable(true);
        w.setCompleter(nullptr);
        QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
        w.show();
        app.exec();
        return 0;
      }
      

      There isn't filtration by content. Am I wrong?

      kshegunovK Offline
      kshegunovK Offline
      kshegunov
      Moderators
      wrote on last edited by
      #15

      Looking at the code I'm pretty sure there is. Have you actually loaded it in your IDE and given it a try?

      Read and abide by the Qt Code of Conduct

      M 1 Reply Last reply
      1
      • kshegunovK kshegunov

        Looking at the code I'm pretty sure there is. Have you actually loaded it in your IDE and given it a try?

        M Offline
        M Offline
        michaeldev
        wrote on last edited by
        #16

        @kshegunov said in QComboBox - filtering by typing:

        Looking at the code I'm pretty sure there is. Have you actually loaded it in your IDE and given it a try?

        Of course.

        1 Reply Last reply
        0
        • M michaeldev

          @VRonin said in QComboBox - filtering by typing:

          Does this do what you want?

          #include <QApplication>
          #include <QStringListModel>
          #include <QPushButton>
          #include <QComboBox>
          #include <QSortFilterProxyModel>
          
          int main(int argc, char **argv) {
            QApplication app(argc, argv);
            QStringList modleList;
            for(int i=1;i<1000;++i)
            modleList <<  QStringLiteral("%1%2").arg(QLatin1Char('a'+(i%26))).arg(i,3,10,QLatin1Char('0'));
            QStringListModel model(modleList);
            QSortFilterProxyModel filterModel;
            filterModel.setSourceModel(&model);
            QComboBox w;
            w.setModel(&filterModel);
            w.setEditable(true);
            w.setCompleter(nullptr);
            QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
            w.show();
            app.exec();
            return 0;
          }
          

          There isn't filtration by content. Am I wrong?

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

          @michaeldev said in QComboBox - filtering by typing:

          There isn't filtration by content. Am I wrong?

          What does the line:

            QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
          

          do?

          M SGaistS 2 Replies Last reply
          0
          • JonBJ JonB

            @michaeldev said in QComboBox - filtering by typing:

            There isn't filtration by content. Am I wrong?

            What does the line:

              QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
            

            do?

            M Offline
            M Offline
            michaeldev
            wrote on last edited by
            #18

            @JonB said in QComboBox - filtering by typing:

            @michaeldev said in QComboBox - filtering by typing:

            There isn't filtration by content. Am I wrong?

            What does the line:

              QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
            

            do?

            Have you actually loaded it in your IDE and given it a try?

            JonBJ kshegunovK 2 Replies Last reply
            0
            • M michaeldev

              @JonB said in QComboBox - filtering by typing:

              @michaeldev said in QComboBox - filtering by typing:

              There isn't filtration by content. Am I wrong?

              What does the line:

                QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
              

              do?

              Have you actually loaded it in your IDE and given it a try?

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

              @michaeldev
              No, I don't have an IDE or a C++ compiler.

              1 Reply Last reply
              0
              • M michaeldev

                @JonB said in QComboBox - filtering by typing:

                @michaeldev said in QComboBox - filtering by typing:

                There isn't filtration by content. Am I wrong?

                What does the line:

                  QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                

                do?

                Have you actually loaded it in your IDE and given it a try?

                kshegunovK Offline
                kshegunovK Offline
                kshegunov
                Moderators
                wrote on last edited by
                #20

                @michaeldev said in QComboBox - filtering by typing:

                Have you actually loaded it in your IDE and given it a try?

                I have and it works. There a couple of GUI tweaks to be done to it, which I imagine are left to you, however the example is functional!

                Read and abide by the Qt Code of Conduct

                M 1 Reply Last reply
                1
                • kshegunovK kshegunov

                  @michaeldev said in QComboBox - filtering by typing:

                  Have you actually loaded it in your IDE and given it a try?

                  I have and it works. There a couple of GUI tweaks to be done to it, which I imagine are left to you, however the example is functional!

                  M Offline
                  M Offline
                  michaeldev
                  wrote on last edited by michaeldev
                  #21

                  @kshegunov said in QComboBox - filtering by typing:

                  @michaeldev said in QComboBox - filtering by typing:

                  Have you actually loaded it in your IDE and given it a try?

                  I have and it works. There a couple of GUI tweaks to be done to it, which I imagine are left to you, however the example is functional!

                  Thanks a lot. Даже так: спасибо, друг! ))

                  1 Reply Last reply
                  0
                  • VRoninV VRonin

                    Does this do what you want?

                    #include <QApplication>
                    #include <QStringListModel>
                    #include <QPushButton>
                    #include <QComboBox>
                    #include <QSortFilterProxyModel>
                    
                    int main(int argc, char **argv) {
                      QApplication app(argc, argv);
                      QStringList modleList;
                      for(int i=1;i<1000;++i)
                      modleList <<  QStringLiteral("%1%2").arg(QLatin1Char('a'+(i%26))).arg(i,3,10,QLatin1Char('0'));
                      QStringListModel model(modleList);
                      QSortFilterProxyModel filterModel;
                      filterModel.setSourceModel(&model);
                      QComboBox w;
                      w.setModel(&filterModel);
                      w.setEditable(true);
                      w.setCompleter(nullptr);
                      QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                      w.show();
                      app.exec();
                      return 0;
                    }
                    
                    M Offline
                    M Offline
                    michaeldev
                    wrote on last edited by michaeldev
                    #22

                    @VRonin said in QComboBox - filtering by typing:

                    Does this do what you want?

                    #include <QApplication>
                    #include <QStringListModel>
                    #include <QPushButton>
                    #include <QComboBox>
                    #include <QSortFilterProxyModel>
                    
                    int main(int argc, char **argv) {
                      QApplication app(argc, argv);
                      QStringList modleList;
                      for(int i=1;i<1000;++i)
                      modleList <<  QStringLiteral("%1%2").arg(QLatin1Char('a'+(i%26))).arg(i,3,10,QLatin1Char('0'));
                      QStringListModel model(modleList);
                      QSortFilterProxyModel filterModel;
                      filterModel.setSourceModel(&model);
                      QComboBox w;
                      w.setModel(&filterModel);
                      w.setEditable(true);
                      w.setCompleter(nullptr);
                      QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                      w.show();
                      app.exec();
                      return 0;
                    }
                    

                    This code does. After changing filtering code to

                    filterModel.setFilterRegExp(QRegExp(input, Qt::CaseInsensitive, QRegExp::FixedString))
                    

                    I have situation nearly to my target. Why "nearly" : I have to press twice filtering symbol in edit. After first pressing - all item appears in edit. And list are being filtered by this item, so - only one item in list. After second pressing - everything is OK. There are filter substring in edit and appropriate items in list.

                    1 Reply Last reply
                    0
                    • JonBJ JonB

                      @michaeldev said in QComboBox - filtering by typing:

                      There isn't filtration by content. Am I wrong?

                      What does the line:

                        QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                      

                      do?

                      SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #23

                      @JonB said in QComboBox - filtering by typing:

                      @michaeldev said in QComboBox - filtering by typing:

                      There isn't filtration by content. Am I wrong?

                      What does the line:

                        QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                      

                      do?

                      It connects the editTextChanged signal to a lambda to which a reference to filterModel is passed (the content of the square brackets), that will be called with a QString parameter (matching the signature of the signal). The lambda body updates the regular expression used by filterModel.

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

                      M JonBJ 2 Replies Last reply
                      2
                      • SGaistS SGaist

                        @JonB said in QComboBox - filtering by typing:

                        @michaeldev said in QComboBox - filtering by typing:

                        There isn't filtration by content. Am I wrong?

                        What does the line:

                          QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                        

                        do?

                        It connects the editTextChanged signal to a lambda to which a reference to filterModel is passed (the content of the square brackets), that will be called with a QString parameter (matching the signature of the signal). The lambda body updates the regular expression used by filterModel.

                        M Offline
                        M Offline
                        michaeldev
                        wrote on last edited by
                        #24

                        @SGaist said in QComboBox - filtering by typing:

                        @JonB said in QComboBox - filtering by typing:

                        @michaeldev said in QComboBox - filtering by typing:

                        There isn't filtration by content. Am I wrong?

                        What does the line:

                          QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                        

                        do?

                        It connects the editTextChanged signal to a lambda to which a reference to filterModel is passed (the content of the square brackets), that will be called with a QString parameter (matching the signature of the signal). The lambda body updates the regular expression used by filterModel.

                        It's clear.

                        1 Reply Last reply
                        0
                        • SGaistS SGaist

                          @JonB said in QComboBox - filtering by typing:

                          @michaeldev said in QComboBox - filtering by typing:

                          There isn't filtration by content. Am I wrong?

                          What does the line:

                            QObject::connect(&w, &QComboBox::editTextChanged, &filterModel, [&filterModel](const QString& input){filterModel.setFilterRegExp('^'+input);},Qt::QueuedConnection);
                          

                          do?

                          It connects the editTextChanged signal to a lambda to which a reference to filterModel is passed (the content of the square brackets), that will be called with a QString parameter (matching the signature of the signal). The lambda body updates the regular expression used by filterModel.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by JonB
                          #25

                          @SGaist
                          My question was purely a rhetorical one! In reply to @michaeldev's

                          There isn't filtration by content. Am I wrong?

                          I was trying to draw his attention to the connect() line with the lambda containing the regular expression as doing the filtering when he said he couldn't see anything which would be doing that.

                          1 Reply Last reply
                          0
                          • T Offline
                            T Offline
                            TENK228
                            wrote on last edited by
                            #26

                            The best option I found is with QCompleter class

                            combo->setEditable(true); // make placeholder editable
                            combo->setCurrentIndex(-1); // focus on placeholder
                            combo->lineEdit()->setPlaceholderText("Enter keywords...");
                            combo->setInsertPolicy(QComboBox::NoInsert); // make QComboBox not insertable, but still editable
                            combo->completer()->setCompletionMode(QCompleter::PopupCompletion); // popup list below with possible options
                            combo->completer()->setCaseSensitivity(Qt::CaseInsensitive);
                            combo->completer()->setFilterMode(Qt::MatchContains); // Finding any matches in text
                            
                            1 Reply Last reply
                            6
                            • V Offline
                              V Offline
                              viTes
                              wrote on last edited by
                              #27

                              come from py, with pyside6, the worked code should be:

                              from PySide6.QtWidgets import QComboBox, QCompleter, QWidget
                              from PySide6.QtCore import Qt, QStringListModel
                              
                              
                              class Selector(QComboBox):
                              
                                  def __init__(self, item_list: list | tuple, parent: QWidget = None, filter: bool = True):
                                      super().__init__(parent)
                              
                                      self.item_list = item_list
                                      self.setEditable(True); self.setInsertPolicy(self.InsertPolicy.NoInsert)
                                      self.addItems(item_list)
                                      if filter:
                                          completer = self._init_completer()
                                          self.setCompleter(completer)
                              
                                      self.editTextChanged.connect(self.on_text_changed)
                              
                                  def _init_completer(self) -> QCompleter:
                                      comp = QCompleter(self)
                                      comp.setFilterMode(Qt.MatchFlag.MatchContains)
                                      comp.setCompletionMode(QCompleter.CompletionMode.PopupCompletion)
                                      comp.setCaseSensitivity(Qt.CaseSensitivity.CaseInsensitive)
                                      return comp
                              
                                  def on_text_changed(self, text):
                                      filtered_items = [item for item in self.item_list if text.lower() in item.lower()]
                                      model = QStringListModel(filtered_items, self)
                                      self.completer().setModel(model)
                              

                              Referenced from @TENK228 code.
                              (this problem troubled me, a newer, for a few days.)

                              1 Reply Last reply
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