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QPointerEvent throws error

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  • JonBJ JonB

    @curiosity
    There is an awful lot of code (and discussion) here, I am lost as to where you are at. In the following order:

    1. connect(echoComboBox,&QComboBox::editTextChanged, this, [](const QString &text) { qDebug() << "text:" << text; } );
      Does this work?

    2. connect(echoComboBox,&QComboBox::editTextChanged, this, &Window::onCurrentTextChanged);
      Where Window::onCurrentTextChanged(const QString &text) slot has qDebug() << "text:" << text; as its first statement.
      Does this work?

    3. Once those are working. If text does not show from passwordLineEdit->setText(text); where you have gone passwordLineEdit->setEchoMode(QLineEdit::PasswordEchoOnEdit); try without PasswordEchoOnEdit, I don't know if that interferes with what you can do or see when you mark a line edit as being for password entry.

    Christian EhrlicherC Offline
    Christian EhrlicherC Offline
    Christian Ehrlicher
    Lifetime Qt Champion
    wrote on last edited by
    #46

    @JonB It can not work. See my comment about local and member variable. C++ basic stuff.

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    JonBJ 1 Reply Last reply
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    • Christian EhrlicherC Christian Ehrlicher

      @JonB It can not work. See my comment about local and member variable. C++ basic stuff.

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by JonB
      #47

      @Christian-Ehrlicher
      Hi Christian. Per your comment I did try searching this page for echoLabel (got a bit confused in the formatting), I thought I saw it was a local newed variable. But that's not to do with connecting?

      Did you mean echoCombobox? But that is also newed and in scope when connect()ed, and I did not come across a member variable of that name instead? Maybe I mis-searched....

      Maybe I should leave you to it, you have perhaps copied the code and played with it.

      Christian EhrlicherC 1 Reply Last reply
      0
      • JonBJ JonB

        @Christian-Ehrlicher
        Hi Christian. Per your comment I did try searching this page for echoLabel (got a bit confused in the formatting), I thought I saw it was a local newed variable. But that's not to do with connecting?

        Did you mean echoCombobox? But that is also newed and in scope when connect()ed, and I did not come across a member variable of that name instead? Maybe I mis-searched....

        Maybe I should leave you to it, you have perhaps copied the code and played with it.

        Christian EhrlicherC Offline
        Christian EhrlicherC Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on last edited by
        #48

        @JonB You might be right. The code formatting (and useless reposting instead editing the former post) and the difference between the source and the header which makes the whole stuff uncompilable as the header is missing the slot definition for onCurrentTextChanged() confused me. Wonder (every time again) what's so hard writing a minimal and compileable example.

        Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
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        JonBJ 1 Reply Last reply
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        • Christian EhrlicherC Christian Ehrlicher

          @JonB You might be right. The code formatting (and useless reposting instead editing the former post) and the difference between the source and the header which makes the whole stuff uncompilable as the header is missing the slot definition for onCurrentTextChanged() confused me. Wonder (every time again) what's so hard writing a minimal and compileable example.

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #49

          @Christian-Ehrlicher
          If you are correct OP will not even get past my point #1. That is why I suggest they follow those in order and we will know where they do/do not get to :)

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          • C curiosity

            @Christian-Ehrlicher

            I tried formatting it. but this was how it shoed up after posting NewWidget.cpp

            #ifndef WINDOW_H
            #define WINDOW_H
            
            #include <QWidget>
            #include <QLineEdit>
            #include <QDebug>
            
            QT_BEGIN_NAMESPACE
            class QLineEdit;
            class QGroupBox;
            QT_END_NAMESPACE
            
            
            class Window : public QWidget
            {
                Q_OBJECT
            
            public:
                QLineEdit *passwordLineEdit;
            
                Window(QWidget *parent = nullptr);
            
            private:
                QLineEdit *echoLineEdit;
                QLineEdit *validatorLineEdit;
                QLineEdit *alignmentLineEdit;
            
            public slots:
                void echoChanged(int);
                void validatorChanged(int);
                void alignmentChanged(int);
                QGroupBox *createFirstGroup();
            
            };
            
            #endif
            

            //Main.cpp

            #include <QApplication>
            
            #include "NewWidget.h"
            
            int main(int argc, char *argv[])
            {
                QApplication app(argc, argv);
                Window window;
                window.show();
                return app.exec();
            }
            

            code is compiling and running.. except that it is not echoing the text entered

            C Offline
            C Offline
            curiosity
            wrote on last edited by curiosity
            #50

            @Christian-Ehrlicher @JonB
            sorry for the typos.. please read as the " this was how it showed*** up after posting NewWidget.cpp

            JonBJ 1 Reply Last reply
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            • C curiosity

              @Christian-Ehrlicher @JonB
              sorry for the typos.. please read as the " this was how it showed*** up after posting NewWidget.cpp

              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #51

              @curiosity I don't know where you are at now, but if you answer where you get to in the 3 steps I suggested earlier we may know where whatever issue lies.

              C 1 Reply Last reply
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              • JonBJ JonB

                @curiosity I don't know where you are at now, but if you answer where you get to in the 3 steps I suggested earlier we may know where whatever issue lies.

                C Offline
                C Offline
                curiosity
                wrote on last edited by curiosity
                #52

                @JonB

                your point 1 isnt working.. i have a break point inside my connect statement and i tried debugging.

                i have following error

                "mincore\com\oleaut32\dispatch\ups.cpp(2122)\OLEAUT32.dll!00007FFCE48BA726: (caller: 00007FFCE48B9B39) ReturnHr(1) tid(3250) 8002801D Library not registered."

                   QObject::connect(echoComboBox, &QComboBox::currentTextChanged, this,  [&](const QString &text) {
                       qDebug() << "text:" << text;/* i have a breakpoint here which is not getting hit also text is not printed to console*/
                         Window::onCurrentTextChanged(text);
                
                       echoLineEdit->show();
                   });
                
                C 1 Reply Last reply
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                • C curiosity

                  @JonB

                  your point 1 isnt working.. i have a break point inside my connect statement and i tried debugging.

                  i have following error

                  "mincore\com\oleaut32\dispatch\ups.cpp(2122)\OLEAUT32.dll!00007FFCE48BA726: (caller: 00007FFCE48B9B39) ReturnHr(1) tid(3250) 8002801D Library not registered."

                     QObject::connect(echoComboBox, &QComboBox::currentTextChanged, this,  [&](const QString &text) {
                         qDebug() << "text:" << text;/* i have a breakpoint here which is not getting hit also text is not printed to console*/
                           Window::onCurrentTextChanged(text);
                  
                         echoLineEdit->show();
                     });
                  
                  C Offline
                  C Offline
                  curiosity
                  wrote on last edited by
                  #53

                  @JonB
                  Its working now.. the signal was emitted from QCombobox.but it should have been

                     QObject::connect(echoLineEdit, &QLineEdit::textChanged, this,  [&](const QString &text) {
                         Window::onCurrentTextChanged(text);
                         echoLineEdit->show();
                     });
                  

                  Now it is working as expected

                  Pl45m4P 1 Reply Last reply
                  1
                  • C curiosity

                    @JonB
                    Its working now.. the signal was emitted from QCombobox.but it should have been

                       QObject::connect(echoLineEdit, &QLineEdit::textChanged, this,  [&](const QString &text) {
                           Window::onCurrentTextChanged(text);
                           echoLineEdit->show();
                       });
                    

                    Now it is working as expected

                    Pl45m4P Online
                    Pl45m4P Online
                    Pl45m4
                    wrote on last edited by Pl45m4
                    #54

                    @curiosity said in QPointerEvent throws error:

                    Now it is working as expected

                    Great, then mark the topic as solved.

                    Beside the discussion about syntax and other stuff and I believe it was mentioned here before....
                    your lambda is not needed and the content does not make too much sense.

                    Window::onCurrentTextChanged(text);

                    In what scope this is called? If you are in Window and you pass this to your labda, you don't need the fully qualified function name.

                    echoLineEdit->show();

                    Calling show() after the text has changed is not needed unless you never insert text manully but always set text programmatically with setText(...).
                    But even then, connecting to slot onCurrentTextChanged(text) in Window would be way easier.


                    If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                    ~E. W. Dijkstra

                    C 1 Reply Last reply
                    1
                    • Pl45m4P Pl45m4

                      @curiosity said in QPointerEvent throws error:

                      Now it is working as expected

                      Great, then mark the topic as solved.

                      Beside the discussion about syntax and other stuff and I believe it was mentioned here before....
                      your lambda is not needed and the content does not make too much sense.

                      Window::onCurrentTextChanged(text);

                      In what scope this is called? If you are in Window and you pass this to your labda, you don't need the fully qualified function name.

                      echoLineEdit->show();

                      Calling show() after the text has changed is not needed unless you never insert text manully but always set text programmatically with setText(...).
                      But even then, connecting to slot onCurrentTextChanged(text) in Window would be way easier.

                      C Offline
                      C Offline
                      curiosity
                      wrote on last edited by
                      #55

                      @Pl45m4

                      if you say that lambda is not needed, in which context do we use lambda for connect statements

                      jsulmJ 1 Reply Last reply
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                      • C curiosity

                        @Pl45m4

                        if you say that lambda is not needed, in which context do we use lambda for connect statements

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #56

                        @curiosity said in QPointerEvent throws error:

                        in which context do we use lambda for connect statements

                        For example if you want to pass additional parameters to the slot which do not exist in the signal.

                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                        1 Reply Last reply
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                        • C curiosity has marked this topic as solved on

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