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About functions and lineEdit

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  • P Offline
    P Offline
    Project try
    wrote on last edited by
    #8

    @
    QObject::connect(edit,SIGNAL(editingFinished()),"what to use here ",SLOT());

    @

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #9

      Since you are using a QLineEdit you will need to get the string and then convert it to an integer.

      @
      QObject::connect(myLineEdit,SIGNAL(editingFinished()), this,SLOT(mySlot()));

      void MyMainWindow::mySlot()
      {
      QString numberText = myLineEdit->text();
      int number = numberText.toString()
      //etc...
      }
      @

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      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • P Offline
        P Offline
        Project try
        wrote on last edited by
        #10

        Thanks buddy , I tried something I hope it will work , the problem is now I need to setlayout , but when I call that function it says :

        @
        error: C3861: 'setlayout': identifier not found
        @

        and there's only this one I didn't setlayout before and it's a new project

        these are the headers I'm using until now:

        #include <QApplication>
        #include<QLabel>
        #include<QHBoxLayout>
        #include<QLineEdit>
        #include<QIntValidator>
        #include <QWidget>

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #11

          You're welcome

          You wrote it wrong, it's setLayout

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

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          • P Offline
            P Offline
            Project try
            wrote on last edited by
            #12

            Same error man :( , even when I write the first two or three letters the function doesn't show , other functions shows like setlocal

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #13

              Can you show the code where this setLayout can be found ?

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

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              • P Offline
                P Offline
                Project try
                wrote on last edited by
                #14

                @
                #include <QApplication>
                #include<QLabel>
                #include<QHBoxLayout>
                #include<QLineEdit>
                #include<QIntValidator>
                #include <QWidget>

                int sum(int x,int y){
                return x+y;
                }

                int main(int argc, char *argv[])
                {
                int x;
                int y;
                QApplication a(argc, argv);

                QLabel *check=new QLabel(QObject::tr("Add numbers:"));
                
                QHBoxLayout *left=new QHBoxLayout;
                
                left->addWidget(check);
                 QValidator *Valid=new QIntValidator();
                
                QLineEdit *edit =new QLineEdit;
                edit->setMaximumWidth(5);
                edit->setFixedWidth(5);
                check->setBuddy(edit);
                edit->setValidator(Valid);
                QObject::connect(edit,SIGNAL(editingFinished()),edit,SLOT(setText(x)));
                QLineEdit *edit1=new QLineEdit;
                edit1->setMaximumWidth(5);
                edit1->setFixedWidth(5);
                check->setBuddy(edit1);
                edit1->setValidator(Valid);
                QObject::connect(edit1,SIGNAL(editingFinished()),edit1,SLOT(setText(y)));
                        left->addWidget(edit);
                QHBoxLayout *Mainlayout=new QHBoxLayout;
                Mainlayout->addLayout(left);
                

                setLayout(Mainlayout);

                sum(x,y);

                return a.exec&#40;&#41;;
                

                }

                @

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #15

                  That won't do what you want at all.

                  You are calling setLayout in main and not on a widget

                  Also your connection statements are wrong.

                  Please, have a look at some of Qt's example to see how things work

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

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                  • P Offline
                    P Offline
                    Project try
                    wrote on last edited by
                    #16

                    Well , that's the only way I would learn is by making mistakes :D , that's why I wanted to do it my way before trying what you guys have told me.

                    by the way why can't I call it in main ? should I include something first ?

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                    • P Offline
                      P Offline
                      Project try
                      wrote on last edited by
                      #17

                      and could you please tell me where should I call it ?

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #18

                        setLayout is a function of QWidget, so you need a QWidget object.

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

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                        • P Offline
                          P Offline
                          Project try
                          wrote on last edited by
                          #19

                          what if I made a class and inherited qwidget ? or there's a better way ?

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                          • P Offline
                            P Offline
                            Project try
                            wrote on last edited by
                            #20

                            Oh , so I could just create a pointer to that object and use that pointer to set the layout ? and if I wanted to make bigger programs I should just inherit it on my classes ?

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #21

                              Subclass QWidget, it's the correct way to go here.

                              You really should take a look at Qt's demos and examples, that will give you a good ground to build on

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

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                              • P Offline
                                P Offline
                                Project try
                                wrote on last edited by
                                #22

                                I really looked at some examples about two weeks ago " I don't have much time " since I've been busy with my midterms exams :(

                                but I'll finish this one , hopefully it will work then I'll look at some examples tomorrow.

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                                • P Offline
                                  P Offline
                                  Project try
                                  wrote on last edited by
                                  #23

                                  about converting from string to int , should always do this ? is there a way to just take an integer or any type i want from the user ?

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                                  • P Offline
                                    P Offline
                                    Project try
                                    wrote on last edited by
                                    #24

                                    I think I'll create a new class to do these things , specially that this won't work because there's no reference. is it ok if I posted on this thread tomorrow ? or it's against the rules to bump a thread with +12 hours without posting ?

                                    thanks man , I really appreciate your help.

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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #25

                                      It's better not to bump 24 hours is the common time interval.

                                      If you want integers directly, use a QSpinBox, it will simplify your program

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

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