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  4. How to setBottomWidget insteads of setCentralWidget? and color? (solved)
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How to setBottomWidget insteads of setCentralWidget? and color? (solved)

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  • H Offline
    H Offline
    houmingc
    wrote on last edited by
    #15

    My objective is to get a scrolling text below the Main Window dialog box. Below is my code, implementing QVBoxLayout, nothing is change, please give some more advice. Thanks

    Ticker* pTicker = new Ticker(this);
    pTicker->setText("  I love u but u love me not     ");
    QMainWindow::setCentralWidget(pTicker);
    QVBoxLayout *vbox=new QVBoxLayout(this);
    vbox->addWidget(pTicker);
    
    QPalette pal=palette();
    pal.setColor(QPalette::Background,Qt::green);
    setPalette(pal);
    setAutoFillBackground(true);
    
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    • H Offline
      H Offline
      houmingc
      wrote on last edited by
      #16

      My objective is to get a scrolling text below the Main Window dialog box. Below is my code, implementing QVBoxLayout, nothing is change, please give some more advice. Thanks

      Ticker* pTicker = new Ticker(this);
      
      pTicker->setText("  I love u but u love me not     ");
      
      QMainWindow::setCentralWidget(pTicker);
      
      QVBoxLayout *vbox=new QVBoxLayout(this);
      
      vbox->addWidget(pTicker);
      
      QPalette pal=palette();
      
      pal.setColor(QPalette::Background,Qt::green);
      
      setPalette(pal);
      
      setAutoFillBackground(true);
      
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      0
      • IamSumitI Offline
        IamSumitI Offline
        IamSumit
        wrote on last edited by
        #17

        Hii.

        You can take some referance from the following link for scrolling the text.
        "here":http://stackoverflow.com/questions/12159443/qt-scrolling-the-text-in-qwidget

        Be Cute

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        • H Offline
          H Offline
          houmingc
          wrote on last edited by
          #18

          I added cpp and header file to my added class.
          Compile successfully, created the object successfully
          When i build and run the program, other than the mainwindow, no text appear and scrolling.

          I went into below site. there is a zip file but i can't download, i have feedback to the administrator for months and there isn't any progress. Please help. Did i miss anything. it seems i am getting near to the answer.
          http://www.qtcentre.org/threads/24712-Marquee-QLabel

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #19

            [quote author="houmingc" date="1415239854"]My objective is to get a scrolling text below the Main Window dialog box. Below is my code, implementing QVBoxLayout, nothing is change, please give some more advice. Thanks
            @
            Ticker* pTicker = new Ticker(this);

            pTicker->setText("  I love u but u love me not     ");
            
            QMainWindow::setCentralWidget(pTicker);
            
            QVBoxLayout *vbox=new QVBoxLayout(this);
            
            vbox->addWidget(pTicker);
            
            QPalette pal=palette();
            
            pal.setColor(QPalette::Background,Qt::green);
            
            setPalette(pal);
            
            setAutoFillBackground(true);
            

            @
            [/quote]

            You are setting pTicker as central widget, then you are setting a QVBoxLayout on your MainWindow which will fail since QMainWindow already has a layout.

            So all in all, if you want your pTicker at the bottom in your QMainWindow centralWidget, then put in on the bottom of a widget that you will set as central widget.

            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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            • H Offline
              H Offline
              houmingc
              wrote on last edited by
              #20

              Dear sir, i commented out setCentrealWidget, still not working.

              QLayout: Attempting to add QLayout "" to MainWindow "MainWindow", which already has a layout
              QWidget::setLayout: Attempting to set QLayout "" on MainWindow "MainWindow", which already has a layout

              Ticker* pTicker = new Ticker(this);
              pTicker->setText("  I love u but u love me not     ");
              QLineEdit *lineEdit =new QLineEdit;
              //QMainWindow::setCentralWidget(pTicker);
              QVBoxLayout *vbox=new QVBoxLayout(this);
              vbox->addWidget(lineEdit);
              vbox->addWidget(pTicker);
              setLayout(vbox);
              
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              • H Offline
                H Offline
                houmingc
                wrote on last edited by
                #21

                Is there other container that i can use other than QVBoxLayout.
                what does showEvent and hideEvent do exactly in ticker.cpp?

                can give more guidance for this problem?

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #22

                  To work with QMainWindow's central widget you have to create a container widget and work on it. I already wrote that setting a layout on a QMainWindow will fail since it already has one.

                  @
                  QWidget *containerWidget = new QWidget;
                  QVBoxLayout *layout = new QVBoxLayout(containerWidget);
                  layout->addStretch(1);
                  layout->addWidget(pTicker);
                  setCentralWidget(containerWidget);
                  @

                  "QMainWindow":http://qt-project.org/doc/qt-5/qmainwindow.html#qt-main-window-framework

                  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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                  • H Offline
                    H Offline
                    houmingc
                    wrote on last edited by
                    #23

                    --How to remove former layout---

                    under ui->setupUi(this);
                    I inserted: delete layout();

                    before adding your code. No progress.

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #24

                      Again: stop trying to put your own layout in QMainWindow, it's not meant for that.

                      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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                      • H Offline
                        H Offline
                        houmingc
                        wrote on last edited by
                        #25

                        deleted mainwindow source file.
                        Insert above code into main instead.
                        compiler complain setCentralWidget was not declared in this scope.

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #26

                          Sure it's not, it's meant to be used in a QMainWindow subclass constructor

                          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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