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Custom QWidget Keyboard first time click issue.

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  • A Offline
    A Offline
    Arvind K
    wrote on last edited by
    #6

    Any Updates??
    Please feel free to ask any questions on above code.

    mrjjM 1 Reply Last reply
    0
    • A Arvind K

      Any Updates??
      Please feel free to ask any questions on above code.

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

      @Arvind-K
      Hi
      What did
      qDebug() << "focus widget " << qApp->focusObject();
      report ?
      in the case where it dont type.

      1 Reply Last reply
      0
      • A Offline
        A Offline
        Arvind K
        wrote on last edited by
        #8

        @mrjj

        i used qDebug() << "focus widget " << qApp->focusObject(); at button click event.

        it doesn't fire at first time . but at second time click on Button "a" i get "focus widget QPushButton(0x26bbc00, name= "Buttona")" log .

        i think at first time my keyboard widget doesn't get activate. after click on widget anywhere it gets activate and after that it works proper.

        how to solve this issue.?

        1 Reply Last reply
        0
        • J.HilkJ Offline
          J.HilkJ Offline
          J.Hilk
          Moderators
          wrote on last edited by
          #9

          Hi,

          from my experience, this behaviour comes from the focus shift,

          you click a button and than it gets the focus a and only than the clicked mechanimn works.

          IIRC, you can change that a couple of different ways.

          the following comes to my mind:

          • Chaning the signal from clicked to released
          • Subclassing QPushButton and manually emitting the pressed signal during focus in event

          Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


          Q: What's that?
          A: It's blue light.
          Q: What does it do?
          A: It turns blue.

          A 1 Reply Last reply
          0
          • J.HilkJ J.Hilk

            Hi,

            from my experience, this behaviour comes from the focus shift,

            you click a button and than it gets the focus a and only than the clicked mechanimn works.

            IIRC, you can change that a couple of different ways.

            the following comes to my mind:

            • Chaning the signal from clicked to released
            • Subclassing QPushButton and manually emitting the pressed signal during focus in event
            A Offline
            A Offline
            Arvind K
            wrote on last edited by
            #10

            @J.Hilk

            Thank you for your reply.

            1. At the first time my Push button click event is not getting fired so released event is also not working.
            2. I have implemented focus in event but at first time its also not getting emitting.
            mrjjM 1 Reply Last reply
            0
            • A Arvind K

              @J.Hilk

              Thank you for your reply.

              1. At the first time my Push button click event is not getting fired so released event is also not working.
              2. I have implemented focus in event but at first time its also not getting emitting.
              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #11

              @Arvind-K
              Hi
              for my keyboard, I find it needed to have
              NoFocus for focusPolicy on the buttons or they steal focus from Lineedit.

              1 Reply Last reply
              1
              • A Offline
                A Offline
                Arvind K
                wrote on last edited by
                #12

                still, the issue is pending. Please provide a solution.

                1 Reply Last reply
                -1
                • D Offline
                  D Offline
                  deleted372
                  wrote on last edited by
                  #13

                  It may be a silly question, does it happen with all the buttons of your keyboard?
                  Are you sure that the first time you push on a button of your keyboard the slot keyboardHandler() gets called?

                  A 1 Reply Last reply
                  0
                  • D deleted372

                    It may be a silly question, does it happen with all the buttons of your keyboard?
                    Are you sure that the first time you push on a button of your keyboard the slot keyboardHandler() gets called?

                    A Offline
                    A Offline
                    Arvind K
                    wrote on last edited by
                    #14

                    @JoZCaVaLLo

                    Yes, it happens with all the buttons of a keyboard. slot keyboardHandler() does not get called for the first time. another thing I observed that when I called a keyboard on QPushbutton clicked event then keyboard works properly. this issue happens with QlineEdit Only.

                    1 Reply Last reply
                    0
                    • D Offline
                      D Offline
                      deleted372
                      wrote on last edited by
                      #15

                      I would call lineEditkeyboard->setLineEdit(line) only when the lineEdit gets the focus.
                      In addition, in the setLineEdit(), I would call this->setFocusProxy(line). In order to avoid your keyboard to steal the focus from your linedit.

                      A 1 Reply Last reply
                      0
                      • D deleted372

                        I would call lineEditkeyboard->setLineEdit(line) only when the lineEdit gets the focus.
                        In addition, in the setLineEdit(), I would call this->setFocusProxy(line). In order to avoid your keyboard to steal the focus from your linedit.

                        A Offline
                        A Offline
                        Arvind K
                        wrote on last edited by
                        #16

                        @JoZCaVaLLo
                        @mrjj
                        @J-Hilk
                        @dheerendra
                        one more thing to share when I called keyboard widget with a show() like
                        lineEditkeyboard->setLineEdit(line);
                        lineEditkeyboard->show();

                        the keyboard works properly but when I called Keyboard like

                        lineEditkeyboard->setLineEdit(line);
                        lineEditkeyboard->setWindowModality(Qt::ApplicationModal);
                        lineEditkeyboard->show();

                        then I face the same issue of the first click.

                        mrjjM 1 Reply Last reply
                        0
                        • A Arvind K

                          @JoZCaVaLLo
                          @mrjj
                          @J-Hilk
                          @dheerendra
                          one more thing to share when I called keyboard widget with a show() like
                          lineEditkeyboard->setLineEdit(line);
                          lineEditkeyboard->show();

                          the keyboard works properly but when I called Keyboard like

                          lineEditkeyboard->setLineEdit(line);
                          lineEditkeyboard->setWindowModality(Qt::ApplicationModal);
                          lineEditkeyboard->show();

                          then I face the same issue of the first click.

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #17

                          @Arvind-K
                          hi, we need to find out what is happening.
                          please do
                          qDebug() << "focus widget " << qApp->focusObject();
                          which tells us when you open the keyboard, who has focus.
                          Meaning who will get the keys if u type.
                          I think you have something that steals keyboard focus when u open the
                          lineEditkeyboard

                          A 1 Reply Last reply
                          0
                          • mrjjM mrjj

                            @Arvind-K
                            hi, we need to find out what is happening.
                            please do
                            qDebug() << "focus widget " << qApp->focusObject();
                            which tells us when you open the keyboard, who has focus.
                            Meaning who will get the keys if u type.
                            I think you have something that steals keyboard focus when u open the
                            lineEditkeyboard

                            A Offline
                            A Offline
                            Arvind K
                            wrote on last edited by
                            #18

                            @mrjj

                            as you said I have done same when keyboard widget is shown.
                            output is

                            DBG default: focus widget QLineEdit(0x227ca90, name = "lineEdit")

                            lineEdit is Nothing but the QLineEdit on Keyboard widget.

                            mrjjM 1 Reply Last reply
                            0
                            • A Arvind K

                              @mrjj

                              as you said I have done same when keyboard widget is shown.
                              output is

                              DBG default: focus widget QLineEdit(0x227ca90, name = "lineEdit")

                              lineEdit is Nothing but the QLineEdit on Keyboard widget.

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

                              @Arvind-K
                              Ok so it does have the focus when first click is not registered?

                              A 1 Reply Last reply
                              0
                              • mrjjM mrjj

                                @Arvind-K
                                Ok so it does have the focus when first click is not registered?

                                A Offline
                                A Offline
                                Arvind K
                                wrote on last edited by
                                #20

                                @mrjj

                                Yes.
                                after that when I click on Anywhere on Widget Nothing happen or no Any event gets called.

                                mrjjM 1 Reply Last reply
                                0
                                • A Arvind K

                                  @mrjj

                                  Yes.
                                  after that when I click on Anywhere on Widget Nothing happen or no Any event gets called.

                                  mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #21

                                  @Arvind-K
                                  so the widget appear frozen for a moment ?
                                  Do you have any kind of loops in constructor or anything like that ?

                                  A 1 Reply Last reply
                                  0
                                  • mrjjM mrjj

                                    @Arvind-K
                                    so the widget appear frozen for a moment ?
                                    Do you have any kind of loops in constructor or anything like that ?

                                    A Offline
                                    A Offline
                                    Arvind K
                                    wrote on last edited by
                                    #22

                                    @mrjj

                                    No, there is no Loop in the constructor or No Any other code only I have connected signal to Slot.

                                    Keyboard::Keyboard(QWidget *parent) :
                                    QWidget(parent),
                                    ui(new Ui::Keyboard)
                                    {
                                    ui->setupUi(this);

                                    this->setWindowFlags(Qt::WindowStaysOnTopHint);
                                    connect ( ui->Buttonq, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonw, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttone, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonr, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttont, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttony, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonu, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttoni, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttono, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonp, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    
                                    connect ( ui->Buttona, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttons, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttond, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonf, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttong, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonh, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonj, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonk, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonl, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonz, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonx, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonc, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonv, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonb, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonn, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Buttonm, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button0, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button1, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button2, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button3, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button4, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button5, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button6, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button7, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button8, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->Button9, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    connect ( ui->space, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                    
                                    outputText = "";
                                    shift = false;
                                    

                                    }

                                    mrjjM 1 Reply Last reply
                                    0
                                    • A Arvind K

                                      @mrjj

                                      No, there is no Loop in the constructor or No Any other code only I have connected signal to Slot.

                                      Keyboard::Keyboard(QWidget *parent) :
                                      QWidget(parent),
                                      ui(new Ui::Keyboard)
                                      {
                                      ui->setupUi(this);

                                      this->setWindowFlags(Qt::WindowStaysOnTopHint);
                                      connect ( ui->Buttonq, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonw, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttone, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonr, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttont, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttony, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonu, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttoni, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttono, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonp, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      
                                      connect ( ui->Buttona, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttons, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttond, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonf, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttong, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonh, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonj, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonk, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonl, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonz, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonx, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonc, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonv, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonb, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonn, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Buttonm, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button0, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button1, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button2, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button3, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button4, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button5, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button6, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button7, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button8, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->Button9, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      connect ( ui->space, SIGNAL( clicked() ), this, SLOT( keyboardHandler() ) );
                                      
                                      outputText = "";
                                      shift = false;
                                      

                                      }

                                      mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #23

                                      @Arvind-K
                                      ok. when this situation is happening.
                                      Does the buttons show activated effect ?
                                      I mean can u see u pres them or anything ?

                                      A 1 Reply Last reply
                                      0
                                      • A Offline
                                        A Offline
                                        Arvind K
                                        wrote on last edited by
                                        #24

                                        @mrjj

                                        As I mentioned Previously when I set WindowModality of Keyboard widget to QApplicationModal I face this First Click issue otherwise it works fine. but if I didn't set windowModality then Keyboard goes back to the parent widget.

                                        **lineEditkeyboard->setWindowModality(Qt::ApplicationModal); **

                                        mrjjM 1 Reply Last reply
                                        0
                                        • A Arvind K

                                          @mrjj

                                          As I mentioned Previously when I set WindowModality of Keyboard widget to QApplicationModal I face this First Click issue otherwise it works fine. but if I didn't set windowModality then Keyboard goes back to the parent widget.

                                          **lineEditkeyboard->setWindowModality(Qt::ApplicationModal); **

                                          mrjjM Offline
                                          mrjjM Offline
                                          mrjj
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #25

                                          Hmm.
                                          The code looks ok fine and i cant see any reason for
                                          QApplicationModal to cause this effect but
                                          it could be a bug in Qt.

                                          1 Reply Last reply
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