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Login screen (How to?)

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  • cxamC Offline
    cxamC Offline
    cxam
    wrote on last edited by
    #1

    Hi! I designed my Qt Gui application using QtDesigner and in order to make diverse layers inside the application (login, main menu, settings, etc.) I made diverse QWidgets for each layer and depending which button inside the GUI was pressed the layers where showing or hiding... Now I have to make all this cool buttons functional and I have to make the login screen usable but I don't know how, in my login screen I have 4 elements: 1: the logo, 2&3: Username and Password QLineEdits and 4: The "Enter" button. I have to make all those funcitional.

    Thanks in advance:

    Carlos.

    Stay Hungry, Stay Foolish

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      What are you going to validate your username/password ? Database ? Local file ?

      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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      • cxamC Offline
        cxamC Offline
        cxam
        wrote on last edited by
        #3

        Just a string, the username and pasword wont be changed

        Stay Hungry, Stay Foolish

        kshegunovK 1 Reply Last reply
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        • cxamC cxam

          Just a string, the username and pasword wont be changed

          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by
          #4

          @cxam

          Just a string, the username and pasword wont be changed

          Just to put a note here - if you use a C++ string for the username and password suppose like this:

          const char * password = "my very secret password";
          

          No one can stop me (or anyone else) from loading your application/library in the disassembler and extracting that string. So do consider this, when thinking about passwords.

          Read and abide by the Qt Code of Conduct

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          2
          • cxamC Offline
            cxamC Offline
            cxam
            wrote on last edited by
            #5

            Yeah I know that it may not be really secure but I just want it to work the easiest way posible, anyways I still dont know how to make the username / password validation system

            Stay Hungry, Stay Foolish

            kshegunovK 1 Reply Last reply
            0
            • cxamC cxam

              Yeah I know that it may not be really secure but I just want it to work the easiest way posible, anyways I still dont know how to make the username / password validation system

              kshegunovK Offline
              kshegunovK Offline
              kshegunov
              Moderators
              wrote on last edited by
              #6

              @cxam
              It's an ordinary dialog, is it not?

              Read and abide by the Qt Code of Conduct

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              • cxamC Offline
                cxamC Offline
                cxam
                wrote on last edited by
                #7

                no, it's not the login takes places in the only window of the software: "mainwindow" when you enter the correct credentials then the login disappears and show the whole thing.

                Stay Hungry, Stay Foolish

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #8

                  Well since it's only a very light login, put the logic in the widget and emit a signal when the login is successful. Then in your main window react on that signal and do the changes needed.

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

                  cxamC 1 Reply Last reply
                  0
                  • SGaistS SGaist

                    Well since it's only a very light login, put the logic in the widget and emit a signal when the login is successful. Then in your main window react on that signal and do the changes needed.

                    cxamC Offline
                    cxamC Offline
                    cxam
                    wrote on last edited by
                    #9

                    @SGaist I have, really little C++ knowledge, would you please tell me the code I have to add ? Thanks in advance

                    Stay Hungry, Stay Foolish

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #10

                      Do you mean the comparison logic ?

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

                      cxamC 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        Do you mean the comparison logic ?

                        cxamC Offline
                        cxamC Offline
                        cxam
                        wrote on last edited by
                        #11

                        @SGaist Yes.

                        Stay Hungry, Stay Foolish

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #12

                          Something like

                          void MyLoginWidget::onOkButtonClicked() 
                          {
                              if (_usernameLineEdit->text() == MyValidUserName &&
                                  _passwordLineEdit->text() == MyTopSecretPassword) {
                                  emit loginSuccessful();
                              } else (
                                  QMessageBox::warning(this, tr("Error"), tr("Invalid username/password combination");
                                  _usernameLineEdit->clear();
                                  _passwordLineEdit->clear();
                              }
                          }
                          

                          WARNING: this is just a quick and dirty sample code.

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

                          cxamC 1 Reply Last reply
                          2
                          • SGaistS SGaist

                            Something like

                            void MyLoginWidget::onOkButtonClicked() 
                            {
                                if (_usernameLineEdit->text() == MyValidUserName &&
                                    _passwordLineEdit->text() == MyTopSecretPassword) {
                                    emit loginSuccessful();
                                } else (
                                    QMessageBox::warning(this, tr("Error"), tr("Invalid username/password combination");
                                    _usernameLineEdit->clear();
                                    _passwordLineEdit->clear();
                                }
                            }
                            

                            WARNING: this is just a quick and dirty sample code.

                            cxamC Offline
                            cxamC Offline
                            cxam
                            wrote on last edited by
                            #13

                            @SGaist So I have to add that code on "mainwindow.ccp" right ? (Sorry about my C++ knowledge haha)

                            Stay Hungry, Stay Foolish

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #14

                              No, in the login widget. The MainWindow widget should only react on the loginSuccessful signal.

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

                              cxamC 1 Reply Last reply
                              0
                              • SGaistS SGaist

                                No, in the login widget. The MainWindow widget should only react on the loginSuccessful signal.

                                cxamC Offline
                                cxamC Offline
                                cxam
                                wrote on last edited by
                                #15

                                @SGaist I hope this will show you more or less how I have my project structured: http://postimg.org/gallery/oeciyc12/660b7d39/

                                Stay Hungry, Stay Foolish

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #16

                                  Ok… So you are trying to have everything in only once widget. Not a good idea. You should following the "Single Responsibility" paradigm. Create one widget per "complex" widget you will have in your main window. Otherwise you will end up with a monster class that does way to much things for its own good and yours to maintain.

                                  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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                                  • cxamC Offline
                                    cxamC Offline
                                    cxam
                                    wrote on last edited by cxam
                                    #17

                                    @SGaist Yeah, I knew that my weird distribution would bring problems hahah. So I'll have to change it. Can you tell me which is the best distribution since I want that EVERYTHING happens in just one window (When I have the project finished I will embed it) ?

                                    Stay Hungry, Stay Foolish

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

                                      Creating several widgets doesn't mean to you will have one application window per widget. What I'm suggesting is to separate things code-wise. You will still have only one MainWindow in the end containing everything but cleanly separated from a coding point of view.

                                      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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                                      • cxamC Offline
                                        cxamC Offline
                                        cxam
                                        wrote on last edited by
                                        #19

                                        @SGaist Ok, I've created a new project > application > QtWidgets application then it created the "MainWindow" class, "MainWindow" header and "MainWindow" Ui.
                                        So for each "screen" I have to create a new C++ class ? Or... How? I don't understand the way to create widgets...

                                        Stay Hungry, Stay Foolish

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                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #20

                                          Yes, create a new C++ class. You will have the option to "pre-populate" it for design development. You should take the time to look at Qt Creator/Designer and Qt's tutorial about how to create UI 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

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