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How to change ui something from different class

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  • B Offline
    B Offline
    beqa
    wrote on 19 Feb 2017, 09:23 last edited by
    #3

    Hi

    void Tunnelqtworking::on_actionResidual_triggered()

    {

    dif.Residual();   // solving
    
    ResidualForm res;     // different class object 
    res.update_data();    // update this data
    

    }

    void ResidualForm::update_data() // this update_data()
    {
    ....

    ui.lcdNumber->display(r1);
    ui.lcdNumber->update();
    

    }

    M 1 Reply Last reply 19 Feb 2017, 09:30
    0
    • B beqa
      19 Feb 2017, 09:23

      Hi

      void Tunnelqtworking::on_actionResidual_triggered()

      {

      dif.Residual();   // solving
      
      ResidualForm res;     // different class object 
      res.update_data();    // update this data
      

      }

      void ResidualForm::update_data() // this update_data()
      {
      ....

      ui.lcdNumber->display(r1);
      ui.lcdNumber->update();
      

      }

      M Offline
      M Offline
      mrjj
      Lifetime Qt Champion
      wrote on 19 Feb 2017, 09:30 last edited by mrjj
      #4

      @beqa
      Well, ResidualForm res; is a local variable and it will deleted as soon as
      on_actionResidual_triggered ends so it only be shown on screen for a very short time.

      Try to new it

      ResidualForm *res= new ResidualForm(this); // use this to give it a parent, else you leak
      res->update_data(); // update this data
      res->show();

      Also is ResidualForm ment to be a Dialog and popup or how was it planned to be shown ?
      You are not inserting it into anything.

      1 Reply Last reply
      0
      • B Offline
        B Offline
        beqa
        wrote on 19 Feb 2017, 09:35 last edited by
        #5

        I have tried signal and slot, but has not worked.
        I emit like this

        void Tunnelqtworking::on_actionResidual_triggered()
        {
        dif.Residual(); // solving

        ResidualForm res; // different class object
        emit update_data(5); // I figured out ,that it needs a parameter
        }
        but in ResidualForm i can't create Tunnelqtworking object, its big and give me unclear errors

        M 1 Reply Last reply 19 Feb 2017, 09:38
        0
        • B beqa
          19 Feb 2017, 09:35

          I have tried signal and slot, but has not worked.
          I emit like this

          void Tunnelqtworking::on_actionResidual_triggered()
          {
          dif.Residual(); // solving

          ResidualForm res; // different class object
          emit update_data(5); // I figured out ,that it needs a parameter
          }
          but in ResidualForm i can't create Tunnelqtworking object, its big and give me unclear errors

          M Offline
          M Offline
          mrjj
          Lifetime Qt Champion
          wrote on 19 Feb 2017, 09:38 last edited by
          #6

          @beqa

          What should ResidualForm res; do ?
          It will die there.
          So this can never work if its any kind of window.

          You want it to popup there ?

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          0
          • B Offline
            B Offline
            beqa
            wrote on 19 Feb 2017, 09:49 last edited by
            #7

            I have tabWidget and add this widget
            ui.tabWidget->addTab(new ResidualForm(), "Residual");

            1 Reply Last reply
            0
            • B Offline
              B Offline
              beqa
              wrote on 19 Feb 2017, 09:55 last edited by
              #8

              I take ResidualForm *res in my .h;
              and definit res = new ResidualForm(this);
              but nothing change

              1 Reply Last reply
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              • B Offline
                B Offline
                beqa
                wrote on 19 Feb 2017, 10:10 last edited by
                #9

                i try on debug and it enter ordinary this update_data function, but dont change ui element. Seems, ui has restriction from outside

                M 1 Reply Last reply 19 Feb 2017, 10:21
                0
                • B beqa
                  19 Feb 2017, 10:10

                  i try on debug and it enter ordinary this update_data function, but dont change ui element. Seems, ui has restriction from outside

                  M Offline
                  M Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on 19 Feb 2017, 10:21 last edited by
                  #10

                  @beqa
                  well in this case, you should NOT make a new one. you should
                  use the one you insert.

                  ui.tabWidget->addTab(new ResidualForm(), "Residual");

                  --->

                  ResidualForm *res; // THIS IN H

                  and u add it
                  res=new ResidualForm()
                  ui.tabWidget->addTab(res, "Residual");

                  so its the same.
                  res->update_data() is for the same shown on screen.

                  Do NOT create new one as its not related to the one shown on screen.

                  So the error is. You insert one , you see on screen.
                  Then you create a SECOND one that you update but its never shown on screen.

                  1 Reply Last reply
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                  • B Offline
                    B Offline
                    beqa
                    wrote on 19 Feb 2017, 11:01 last edited by
                    #11

                    THANK YOU, YOU ARE WELCOME. ITS WORK.
                    Differently, I wonder is it possible to change different class's ui?

                    M 1 Reply Last reply 19 Feb 2017, 11:04
                    1
                    • B beqa
                      19 Feb 2017, 11:01

                      THANK YOU, YOU ARE WELCOME. ITS WORK.
                      Differently, I wonder is it possible to change different class's ui?

                      M Offline
                      M Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on 19 Feb 2017, 11:04 last edited by
                      #12

                      @beqa said in How to change ui something from different class:

                      , I wonder is it possible to change different class's ui?

                      They are private for the reason, that one should not directly access another's Windows
                      widgets.
                      But you can move it to public and you can access ui-> from outside but this leads
                      to bad code and not a good idea.
                      Its much better to provide function the outside can use
                      Like your update_data

                      If you allow the outside to know the inner details of other classes, you get spaghetti code and
                      a little change will result in many other changes in rest of program.

                      1 Reply Last reply
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                      • B Offline
                        B Offline
                        beqa
                        wrote on 19 Feb 2017, 11:10 last edited by
                        #13

                        thanks, you are very Helpfull

                        1 Reply Last reply
                        1

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                        19 Feb 2017, 11:04

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