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QComboBox - filtering by typing

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  • M michaeldev

    @SGaist said in QComboBox - filtering by typing:

    Hi,

    doesn't work is a bit too vague.

    Did you check that code?

    aha_1980A Offline
    aha_1980A Offline
    aha_1980
    Lifetime Qt Champion
    wrote on last edited by
    #8

    Hi @michaeldev

    as you can see two posts above @mrjj tested it for you and it works.

    So would you please tell us what's not working for you?

    Regards

    Qt has to stay free or it will die.

    M 1 Reply Last reply
    2
    • aha_1980A aha_1980

      Hi @michaeldev

      as you can see two posts above @mrjj tested it for you and it works.

      So would you please tell us what's not working for you?

      Regards

      M Offline
      M Offline
      michaeldev
      wrote on last edited by
      #9

      @aha_1980 said in QComboBox - filtering by typing:

      Hi @michaeldev

      as you can see two posts above @mrjj tested it for you and it works.

      So would you please tell us what's not working for you?

      Regards

      I wrote "Don't propose LineEdit".

      Interesting, filtering works by first symbols (without additional QLineEdit), but doesn't work by "containing".

      aha_1980A mrjjM 2 Replies Last reply
      0
      • M michaeldev

        @aha_1980 said in QComboBox - filtering by typing:

        Hi @michaeldev

        as you can see two posts above @mrjj tested it for you and it works.

        So would you please tell us what's not working for you?

        Regards

        I wrote "Don't propose LineEdit".

        Interesting, filtering works by first symbols (without additional QLineEdit), but doesn't work by "containing".

        aha_1980A Offline
        aha_1980A Offline
        aha_1980
        Lifetime Qt Champion
        wrote on last edited by
        #10

        @michaeldev

        don't propose != doesn't work

        every combo box includes a line edit, so you can do the filtering within the combo box if you adopt the example.

        you cannot expect us to write your code, we just suggest and help. for free! it's up to you to want our help or not.

        Qt has to stay free or it will die.

        1 Reply Last reply
        0
        • M michaeldev

          @aha_1980 said in QComboBox - filtering by typing:

          Hi @michaeldev

          as you can see two posts above @mrjj tested it for you and it works.

          So would you please tell us what's not working for you?

          Regards

          I wrote "Don't propose LineEdit".

          Interesting, filtering works by first symbols (without additional QLineEdit), but doesn't work by "containing".

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #11

          @michaeldev
          the lineedit is not important. its just that
          the sample would die from recursive calls as we
          would filter and type at same time and trigger signal, that trigger filter that trigger signal etc so
          i just use lineEdit for input as not to waste time to find out what signal to use instead to fix the sample or why
          rapid change of input would make it crash in its own lists. or what ever it was.

          it does work fine otherwise finding any combination of wildcards i tried.

          I expected you to put a debugger to it and see what is going on. :)

          1 Reply Last reply
          3
          • M Offline
            M Offline
            michaeldev
            wrote on last edited by
            #12

            Right now my code :

            #ifndef MYCOMBOBOX_H
            #define MYCOMBOBOX_H
            
            #include <QComboBox>
            #include <QtSql>
            
            class MyComboBox : public QComboBox
            {
            
                Q_OBJECT
            
            public:
                explicit MyComboBox(QWidget *parent);
                virtual void showPopup();
                void focusOutEvent(QFocusEvent* event);
                void init(const QSqlRelationalTableModel *model,
                          const int idx,
                          const QString &relFiled);
            
            private:
                int relFieldIdx;
            };
            
            #endif // MYCOMBOBOX_H
            
            
            #include "mycombobox.h"
            
            #include <QCompleter>
            #include <QApplication>
            
            MyComboBox::MyComboBox(QWidget *parent) :
                QComboBox(parent)
            {
            }
            
            //Better do this in constructor, but - file ui
            void MyComboBox::init(const QSqlRelationalTableModel *model,
                                  const int idx,
                                  const QString &relFiled)
            {
                QSqlTableModel *relModel = model->relationModel(idx);
            
                relFieldIdx = relModel->fieldIndex(relFiled);
            
                setModel(relModel);
                setModelColumn(relFieldIdx);
                setEditable(false);
            }
            
            void MyComboBox::showPopup()
            {
                setEditable(true);
            
                QCompleter *completer = new QCompleter(model(), this);
                completer->setCompletionMode(QCompleter::PopupCompletion);
                completer->setCompletionColumn(relFieldIdx);
                setCompleter(completer);
            
                QComboBox::showPopup();
            }
            
            void MyComboBox::focusOutEvent(QFocusEvent* event) {
            
                //This code (probably) should be done differently
                if ((QApplication::focusWidget() != this) && (QApplication::focusWidget() != view()))
                    setEditable(false);
                //
            
                QComboBox::focusOutEvent(event);
            }
            
            

            I don't have filtering by typing "by containing", only "by first symbols". But there is only one widget - MyComboBox. Maybe later I will make filtering in "God's regime ))
            Using - first call init(...)

            1 Reply Last reply
            0
            • VRoninV Offline
              VRoninV Offline
              VRonin
              wrote on last edited by VRonin
              #13

              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;
              }
              

              "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

              M 2 Replies Last reply
              3
              • 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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