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implementing a dynamic display

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  • mzimmersM Offline
    mzimmersM Offline
    mzimmers
    wrote on last edited by
    #15

    I've decided to implement the additional fields using a QDialog object. I created a second form for this dialog, but then realized I don't know how to access this form programmatically. Can someone point me to some directions on this? I've done some looking but haven't found anything that tells me how to connect up a second form.

    Clarification: I know that I want the form to be enabled when a button push delivers a signal, but I don't know how to "point to" this form programatically. I hope this makes sense; I've been struggling to find the right words to explain what I'm looking for.

    Thanks...

    1 Reply Last reply
    1
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #16

      You usually subclass QDialog and give it the necessary API to access what you want. Depending on what you want to add, you can also simply hide what should not be used.

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

      mzimmersM 1 Reply Last reply
      1
      • SGaistS SGaist

        You usually subclass QDialog and give it the necessary API to access what you want. Depending on what you want to add, you can also simply hide what should not be used.

        mzimmersM Offline
        mzimmersM Offline
        mzimmers
        wrote on last edited by
        #17

        @SGaist so each form would then have its own subclass?

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #18

          Just to be sure we are talking about the same thing, what do you mean by form ?

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

          mzimmersM 1 Reply Last reply
          0
          • SGaistS SGaist

            Just to be sure we are talking about the same thing, what do you mean by form ?

            mzimmersM Offline
            mzimmersM Offline
            mzimmers
            wrote on last edited by
            #19

            @SGaist by "form" I mean an entry under "Forms" in the project file; ie, a file with a .ui extension that is generated by Designer.

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #20

              Then that's the most common use case. You create as many "Forms" you need and give them the API you need.

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

              1 Reply Last reply
              1
              • mzimmersM Offline
                mzimmersM Offline
                mzimmers
                wrote on last edited by
                #21

                I see. So, when I created this project, I selected Qt Widgets Application, and Creator automatically set up the form and the class for me. Should I use that class as a model for my new form?

                I still don't quite understand how the program "knows" to use the .ui file. I don't see the connection anywhere in my code.

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #22

                  It's just a starting point. Nothing forbids you to have several forms.

                  The .uil file is processed by uic to generate code (a bit like moc for QObject based classes) then the ui.setupUi(this); line does the "magic" to setup everything you prepared with Designer.

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

                  1 Reply Last reply
                  1
                  • mzimmersM Offline
                    mzimmersM Offline
                    mzimmers
                    wrote on last edited by
                    #23

                    I've tried to implement a new class (patterned after my main form)...obviously I don't understand something.

                    Here's the header:

                    #ifndef CREDENTIALS_H
                    #define CREDENTIALS_H
                    
                    #include <QWidget>
                    
                    namespace Ui
                    {
                        class Credentials;
                    }
                    class Credentials : public QWidget
                    {
                        Q_OBJECT
                    public:
                        explicit Credentials(QWidget *parent = nullptr);
                    private:
                        Ui::Credentials *uiCredentials;
                    };
                    
                    #endif // CREDENTIALS_H
                    

                    and here's the source:

                    #include "credentials.h"
                    #include "ui_credentials.h"
                    
                    Credentials::Credentials(QWidget *parent)
                        : QWidget(parent),
                          uiCredentials(new Ui::Credentials)
                    
                    {
                        uiCredentials->setupUi(this);
                    }
                    

                    I'm getting an error "invalid use of incomplete type 'class Ui::Credentials'. Why is it incomplete?

                    kshegunovK 1 Reply Last reply
                    0
                    • mzimmersM mzimmers

                      I've tried to implement a new class (patterned after my main form)...obviously I don't understand something.

                      Here's the header:

                      #ifndef CREDENTIALS_H
                      #define CREDENTIALS_H
                      
                      #include <QWidget>
                      
                      namespace Ui
                      {
                          class Credentials;
                      }
                      class Credentials : public QWidget
                      {
                          Q_OBJECT
                      public:
                          explicit Credentials(QWidget *parent = nullptr);
                      private:
                          Ui::Credentials *uiCredentials;
                      };
                      
                      #endif // CREDENTIALS_H
                      

                      and here's the source:

                      #include "credentials.h"
                      #include "ui_credentials.h"
                      
                      Credentials::Credentials(QWidget *parent)
                          : QWidget(parent),
                            uiCredentials(new Ui::Credentials)
                      
                      {
                          uiCredentials->setupUi(this);
                      }
                      

                      I'm getting an error "invalid use of incomplete type 'class Ui::Credentials'. Why is it incomplete?

                      kshegunovK Offline
                      kshegunovK Offline
                      kshegunov
                      Moderators
                      wrote on last edited by kshegunov
                      #24
                      #include "ui_credentials_form_file_name.h"
                      

                      Read and abide by the Qt Code of Conduct

                      1 Reply Last reply
                      2
                      • mzimmersM Offline
                        mzimmersM Offline
                        mzimmers
                        wrote on last edited by
                        #25

                        I think I'm already doing that -- in the source file:

                        #include "credentials.h"
                         ***** #include "ui_credentials.h" *****
                        Credentials::Credentials(QWidget *parent)
                        

                        0_1510758968869_credential.PNG

                        1 Reply Last reply
                        0
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #26

                          Did you re-run qmake after adding your new form ?

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

                          mzimmersM 1 Reply Last reply
                          0
                          • SGaistS SGaist

                            Did you re-run qmake after adding your new form ?

                            mzimmersM Offline
                            mzimmersM Offline
                            mzimmers
                            wrote on last edited by
                            #27

                            @SGaist Yes. (I just tried it again to be sure.) I even did a clean/qmake/build...same results.

                            kshegunovK 1 Reply Last reply
                            0
                            • mzimmersM mzimmers

                              @SGaist Yes. (I just tried it again to be sure.) I even did a clean/qmake/build...same results.

                              kshegunovK Offline
                              kshegunovK Offline
                              kshegunov
                              Moderators
                              wrote on last edited by
                              #28

                              And is the root object of your form called "Credentials" (look for it when you open the form in the designer - in the right, in the object tree the first object's name)?

                              Read and abide by the Qt Code of Conduct

                              1 Reply Last reply
                              3
                              • mzimmersM Offline
                                mzimmersM Offline
                                mzimmers
                                wrote on last edited by
                                #29

                                Aha! That did the trick. Thanks, kshegunov. It was simply called "Dialog."

                                So, the step I missed was matching the name of the top-level object created in Designer with the new class I created manually to support it. I looked past this because the first form (and its supporting class) was created automatically when I started the project.

                                Thanks again.

                                mrjjM 1 Reply Last reply
                                2
                                • mzimmersM mzimmers

                                  Aha! That did the trick. Thanks, kshegunov. It was simply called "Dialog."

                                  So, the step I missed was matching the name of the top-level object created in Designer with the new class I created manually to support it. I looked past this because the first form (and its supporting class) was created automatically when I started the project.

                                  Thanks again.

                                  mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on last edited by mrjj
                                  #30

                                  @mzimmers
                                  Hi
                                  Just as a note. you can add as many forms as you like and
                                  have them auto created like mainwindow is.

                                  It sounds you manually created Credentials ?

                                  To get a new form, simply right click top of project, select "Add new" and then
                                  alt text
                                  In next window, you can choose if it should be MainWindow, Dialog or Widget.

                                  This way you get .ui, cpp and h all ready to go.

                                  maybe i misunderstood but just in case :)

                                  mzimmersM 1 Reply Last reply
                                  2
                                  • mrjjM mrjj

                                    @mzimmers
                                    Hi
                                    Just as a note. you can add as many forms as you like and
                                    have them auto created like mainwindow is.

                                    It sounds you manually created Credentials ?

                                    To get a new form, simply right click top of project, select "Add new" and then
                                    alt text
                                    In next window, you can choose if it should be MainWindow, Dialog or Widget.

                                    This way you get .ui, cpp and h all ready to go.

                                    maybe i misunderstood but just in case :)

                                    mzimmersM Offline
                                    mzimmersM Offline
                                    mzimmers
                                    wrote on last edited by
                                    #31

                                    @mrjj oh, that's good to know about. I looked right past that and just created the form from the line below. Thanks, mrjj...I'll remember that for the (not so distant) future.

                                    mrjjM 1 Reply Last reply
                                    0
                                    • mzimmersM mzimmers

                                      @mrjj oh, that's good to know about. I looked right past that and just created the form from the line below. Thanks, mrjj...I'll remember that for the (not so distant) future.

                                      mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #32

                                      @mzimmers
                                      Ah, yep that gives you just the ui file which is useful for hooking somes some interface up
                                      with existing code. But not so much for a brand new window/dialog. :)

                                      1 Reply Last reply
                                      1
                                      • MRenM Offline
                                        MRenM Offline
                                        MRen
                                        wrote on last edited by
                                        #33

                                        Just as a note. you can add as many forms as you like and
                                        have them auto created like mainwindow is.

                                        P.s.:Hi

                                        1 Reply Last reply
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