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About functions and lineEdit

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  • S Offline
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    SGaist
    Lifetime Qt Champion
    wrote on 6 Mar 2014, 20:46 last edited by
    #5

    [quote author="sierdzio" date="1394138154"][quote author="SGaist" date="1394138001"]Hi[/quote]

    Hehe, ok, I can see we are working in parallel again :D

    I'll leave the "night shift" to you, I'm going to sleep now. Have fun :)[/quote]

    That's what is called multicore mate ! ^^

    Good night ! :)

    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
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      Project try
      wrote on 6 Mar 2014, 21:21 last edited by
      #6

      I'm sorry about the code guys ^^

      thanks for helping , I just wanted to know about question 3:

      lets say I have an integer x;

      and the user edited the line and I used editingfinshed to wait for the user to press enter , after pressing enter what function do I use so what the user entered " integer " get copied in the variable that I've used so I can do calculations ? and should I use connect here ?

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      • P Offline
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        wrote on 6 Mar 2014, 21:26 last edited by
        #7

        I searched and found settext , but it takes strings ? i want to copy it to an int

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        • P Offline
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          Project try
          wrote on 6 Mar 2014, 21:27 last edited by
          #8

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

          @

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          • S Offline
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            SGaist
            Lifetime Qt Champion
            wrote on 6 Mar 2014, 22:13 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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            • P Offline
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              wrote on 6 Mar 2014, 22:23 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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              • S Offline
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                SGaist
                Lifetime Qt Champion
                wrote on 6 Mar 2014, 22:30 last edited by
                #11

                You're welcome

                You wrote it wrong, it's setLayout

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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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                  wrote on 6 Mar 2014, 22:42 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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                  • S Offline
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                    SGaist
                    Lifetime Qt Champion
                    wrote on 6 Mar 2014, 22:53 last edited by
                    #13

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

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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
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                      wrote on 6 Mar 2014, 22:57 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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                      • S Offline
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                        SGaist
                        Lifetime Qt Champion
                        wrote on 6 Mar 2014, 23:07 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

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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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                          wrote on 6 Mar 2014, 23:11 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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                            wrote on 6 Mar 2014, 23:13 last edited by
                            #17

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

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                            • S Offline
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                              SGaist
                              Lifetime Qt Champion
                              wrote on 6 Mar 2014, 23:17 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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                                wrote on 6 Mar 2014, 23:18 last edited by
                                #19

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

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                                  wrote on 6 Mar 2014, 23:21 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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                                  • S Offline
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                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on 6 Mar 2014, 23:22 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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                                      wrote on 6 Mar 2014, 23:26 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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                                        wrote on 6 Mar 2014, 23:27 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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                                          wrote on 7 Mar 2014, 00:11 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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