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Minimizing Vertical Spacing in QGridLayout

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  • A Offline
    A Offline
    Absurd
    wrote on last edited by
    #20

    Thanks for the help. Appreciate it!

    Ok, running the exact same code as yours, I get different results...

    main.cpp:

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

    Widget.h:

    #ifndef WIDGET_H_
    #define WIDGET_H_
    
    #include <QWidget>
    
    class Widget : public QWidget {
        Q_OBJECT
    
    public:
        Widget(QWidget* parent = 0);
    };
    
    #endif
    

    Widget.cpp:

    #include "Widget.h"
    #include <QGridLayout>
    #include <QLineEdit>
    #include <QSpacerItem>
    
    Widget::Widget(QWidget *parent)
        : QWidget(parent)
    {
        QGridLayout *gLay = new QGridLayout(this);
        gLay->setSpacing(0);
        gLay->setMargin(0);
    
        for(int i(0); i < 4; i++){
            for(int j(0); j < 32; j++) {
                if( j == 0 || j == 31){
                    gLay->addItem(new QSpacerItem(0,0,QSizePolicy::Expanding, QSizePolicy::Minimum),i,j);
                } else {
                    QLineEdit *le = new QLineEdit(this);
                    le->setMaxLength(1);
                    le->setFixedWidth(16);
                    le->setAlignment(Qt::AlignCenter);
                    le->setText("0");
                    gLay->addWidget(le,i,j,1,1, Qt::AlignCenter);
                }
            }
        }
    }
    

    And then:

    $> qmake-qt4 -project
    $> qmake-qt4 testing.pro
    $> make
    $> ./testing
    

    and the result:
    0_1545131067077_61efcb2e-9c97-48ec-8d01-eaaaa3fac713-image.png


    Maybe I am using different qt version?
    Maybe it's an environment issue?
    What else could it be?

    1 Reply Last reply
    0
    • A Offline
      A Offline
      Absurd
      wrote on last edited by Absurd
      #21

      Important update
      I tried to compile & run the same code on another machine, and guess what...

      0_1545142446417_9270b473-9f2b-43a9-b213-846dae79abd5-image.png

      $> uname -a
      Linux 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
      

      Does anyone has an idea on why would different machine render the GUI differently?

      mrjjM 1 Reply Last reply
      0
      • A Absurd

        Important update
        I tried to compile & run the same code on another machine, and guess what...

        0_1545142446417_9270b473-9f2b-43a9-b213-846dae79abd5-image.png

        $> uname -a
        Linux 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
        

        Does anyone has an idea on why would different machine render the GUI differently?

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #22

        @Absurd
        Are the both linuxes ? ( with GNOME)

        A 1 Reply Last reply
        0
        • mrjjM mrjj

          @Absurd
          Are the both linuxes ? ( with GNOME)

          A Offline
          A Offline
          Absurd
          wrote on last edited by Absurd
          #23

          @mrjj
          Yes, they are both Linux-based, but not both are GNOME:

          The bad:

          $> uname -a 
          Linux 3.10.0-327.el7.x86_64 #1 SMP Thu Oct 29 17:29:29 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
          $> ls /usr/bin/*session
          /usr/bin/gnome-session*  /usr/bin/gnome-session-custom-session*
          $> qmake-qt4 --version
          QMake version 2.01a
          Using Qt version 4.8.5 in /usr/lib64
          

          The good:

          $> uname -a
          Linux 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
          $> ls /usr/bin/*session
          /usr/bin/byobu-select-session*  /usr/bin/dbus-run-session*
          $> qmake-qt4 --version
          QMake version 2.01a
          Using Qt version 4.8.7 in /usr/lib/x86_64-linux-gnu
          
          mrjjM 1 Reply Last reply
          0
          • A Absurd

            @mrjj
            Yes, they are both Linux-based, but not both are GNOME:

            The bad:

            $> uname -a 
            Linux 3.10.0-327.el7.x86_64 #1 SMP Thu Oct 29 17:29:29 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
            $> ls /usr/bin/*session
            /usr/bin/gnome-session*  /usr/bin/gnome-session-custom-session*
            $> qmake-qt4 --version
            QMake version 2.01a
            Using Qt version 4.8.5 in /usr/lib64
            

            The good:

            $> uname -a
            Linux 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
            $> ls /usr/bin/*session
            /usr/bin/byobu-select-session*  /usr/bin/dbus-run-session*
            $> qmake-qt4 --version
            QMake version 2.01a
            Using Qt version 4.8.7 in /usr/lib/x86_64-linux-gnu
            
            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #24

            @Absurd
            Hi
            Could yo try to do

            #include <QDebug>
            #include <QStyle>
            
            int main(int argc, char *argv[])
            {
                QApplication a(argc, argv);
                qDebug() << QApplication::style()->objectName();
            ...normal code...
            

            and see if they list different styles ?

            1 Reply Last reply
            1
            • A Offline
              A Offline
              Absurd
              wrote on last edited by Absurd
              #25

              Adding the code you suggested;
              The Bad prints out "oxygen",
              The Good prints out "windows".

              What does that mean?

              Thanks.

              mrjjM 1 Reply Last reply
              0
              • A Absurd

                Adding the code you suggested;
                The Bad prints out "oxygen",
                The Good prints out "windows".

                What does that mean?

                Thanks.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #26

                @Absurd
                It means that it uses different QStyles for the look and apparently
                the oxygen draws the LineEdit with little border or something like that.

                on the good, could you try

                 QStyle *style = QStyleFactory::create("oxygen");
                    if(style)
                    {
                        qDebug("Oxygen loaded!");        
                        QApplication::setStyle(style);
                    }
                

                and see if it then get a space like the bad one ?

                1 Reply Last reply
                2
                • A Offline
                  A Offline
                  Absurd
                  wrote on last edited by Absurd
                  #27

                  You nailed it!
                  I added this code on the 'Good', but QStyleFactory::create("oxygen"); returned NULL for some reason (do you happen to know how can I inspect why? is there something like 'errno' I can print out?), so instead I tried this on the 'Bad':

                  QStyle *style = QStyleFactory::create("windows");
                     if(style)
                     {
                         qDebug("windows loaded!");        
                         QApplication::setStyle(style);
                     }
                  

                  and voilà:
                  0_1545145924547_6f35a3ef-60b0-4f07-b136-60657b3ef691-image.png

                  Now, I guess I can use it as a WA, but I'm curious:
                  How is the QStyle determined inside a QApplication?
                  Could it be related to the qt4 versions? (in the 'Bad' machine I didn't have to install qt4 - it was there when I got it, but on the 'Good' I had to install it with sudo apt install qt4-default)

                  Thanks again!

                  mrjjM 1 Reply Last reply
                  0
                  • A Absurd

                    You nailed it!
                    I added this code on the 'Good', but QStyleFactory::create("oxygen"); returned NULL for some reason (do you happen to know how can I inspect why? is there something like 'errno' I can print out?), so instead I tried this on the 'Bad':

                    QStyle *style = QStyleFactory::create("windows");
                       if(style)
                       {
                           qDebug("windows loaded!");        
                           QApplication::setStyle(style);
                       }
                    

                    and voilà:
                    0_1545145924547_6f35a3ef-60b0-4f07-b136-60657b3ef691-image.png

                    Now, I guess I can use it as a WA, but I'm curious:
                    How is the QStyle determined inside a QApplication?
                    Could it be related to the qt4 versions? (in the 'Bad' machine I didn't have to install qt4 - it was there when I got it, but on the 'Good' I had to install it with sudo apt install qt4-default)

                    Thanks again!

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by mrjj
                    #28

                    @Absurd said in Minimizing Vertical Spacing in QGridLayout:
                    Hi
                    As far as i know QStyleFactory cannot tell you why. only list available styles.

                    • How is the QStyle determined inside a QApplication?
                      Never saw the actual for that detection. so cant tell. sorry.

                    Im wondering if 4.8.5 had a small bug where even disable the border would not
                    reduce the space used. And that was fixed in 4.8.7. Or it simply is a QStyle drawing difference.

                    1 Reply Last reply
                    0
                    • A Offline
                      A Offline
                      Absurd
                      wrote on last edited by
                      #29

                      I will try installing 4.8.7 and will update if the behavior is different there...

                      1 Reply Last reply
                      1

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