Qt Forum

    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search
    • Unsolved

    Call for Presentations - Qt World Summit

    Unsolved Layout, widgets not inside ???

    General and Desktop
    9
    87
    1037
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • SGaist
      SGaist Lifetime Qt Champion last edited by

      @SPlatten said in Layout, widgets not inside ???:

      QString strLayout(mpobjNode->strGetAttribute(clsXMLnode::mscszAttrLayout));
      if ( strLayout.compare(clsXMLnode::mscszLayoutGrid) == 0 ) {
      mpobjNode->mpobjLayout = new QGridLayout(pParent);
      } else if ( strLayout.compare(clsXMLnode::mscszLayoutHorizontal) == 0 ) {
      mpobjNode->mpobjLayout = new QHBoxLayout(pParent);
      } else if ( strLayout.compare(clsXMLnode::mscszLayoutVertical) == 0 ) {
      mpobjNode->mpobjLayout = new QVBoxLayout(pParent);
      }
      if ( mpobjNode->mpobjLayout != nullptr ) {
      setLayout(mpobjNode->mpobjLayout);
      }

      You know that passing a parent to a layout automatically applies that layout on the parent given ?

      Following the logic of that block of code, you should replace pParent by this and drop the last if.

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

      SPlatten 1 Reply Last reply Reply Quote 1
      • SPlatten
        SPlatten @SGaist last edited by SPlatten

        @SGaist , I've modified the source and tested again, still the same result:

        QString strLayout(mpobjNode->strGetAttribute(clsXMLnode::mscszAttrLayout));
        if ( strLayout.isEmpty() != true ) {
            QWidget* pobjWidget(mpobjNode->pobjGetWidget());
            if ( pobjWidget != nullptr ) {
                if ( strLayout.compare(clsXMLnode::mscszLayoutGrid) == 0 ) {
                    mpobjNode->mpobjLayout = new QGridLayout(pobjWidget);
                } else if ( strLayout.compare(clsXMLnode::mscszLayoutHorizontal) == 0 ) {
                    mpobjNode->mpobjLayout = new QHBoxLayout(pobjWidget);
                } else if ( strLayout.compare(clsXMLnode::mscszLayoutVertical) == 0 ) {
                    mpobjNode->mpobjLayout = new QVBoxLayout(pobjWidget);
                }
            }
        }
        

        In the above code:
        this points to the an instance of clsQtGroupBox.
        mpobjNode is a pointer to the XML node, in this case groupbox.
        pobjWidget is a pointer to the instance of QGroupBox.
        mpobjLayout is a pointer to the layout created using the pobjWidget as a parent.

        Later in the code where the radio buttons or other nodes are created and added to parents:

         if ( mpobjParent != nullptr ) {
            bool blnAppend(true);
        //Does the parent node have a layout?
            QLayout* pobjLayout(mpobjParent->pobjGetLayout());
            if ( pobjLayout != nullptr ) {
        //Yes, add this widget to the layout
                QWidget* pobjWidget(pobjGetWidget());
                if ( pobjWidget != nullptr ) {
                    pobjLayout->addWidget(pobjWidget);
                    blnAppend = false;
                }
            }
        //Update the parent adding 'this' node to it's child list
            mpobjParent->appendChild(this, blnAppend);
        }
        

        this points to an instance of clsQtRadioButton
        mpobjParent is a pointer to the parent clsQtGroupBox
        pobjLayout is a pointer to the layout QLayout created in the previous section.
        pobjWidget is a pointer to QRadioButton widget

        Unfortunately this still results in:
        Screenshot 2021-10-17 at 08.13.40.png

        Kind Regards,
        Sy

        1 Reply Last reply Reply Quote 0
        • SGaist
          SGaist Lifetime Qt Champion last edited by

          The issue I am seeing here is that your children widgets seems to need to know stuff about their parent. Why ?

          Following a top down approach, you start with the "master" widget that for example is your QGroupBox, add a layout to it, then next step, add the two QRadioButtons one after the other.

          If that group box is inside another widget, then it's not its problem. The positioning within a parent widget's layout or in coordinates is the responsibility of said parent.

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

          P 1 Reply Last reply Reply Quote 1
          • P
            Publicnamer @SGaist last edited by

            @SGaist I would just like to point out that in many cases manual layout of widgets saves a lot of development time and the code is perfectly understandable (unless sloppily written). The present-day focus on XML layout is a fad that is wasting a lot of people's time.

            JKSH 1 Reply Last reply Reply Quote 0
            • JKSH
              JKSH Moderators @Publicnamer last edited by

              @Publicnamer said in Layout, widgets not inside ???:

              I would just like to point out that in many cases manual layout of widgets saves a lot of development time and the code is perfectly understandable (unless sloppily written). The present-day focus on XML layout is a fad that is wasting a lot of people's time.

              For small projects, perhaps.

              I, for one, find that a WYSIWYG editor helps me get my GUI up and running faster than manually coding its layouts in C++. And for very large projects, it's helpful to enable a front-end designer and back-end developer to work in parallel.

              Please note that to OP's use-case is not the same as how we typically use XML .ui files in Qt. It is definitely not our "present-day focus".

              Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

              1 Reply Last reply Reply Quote 2
              • AxelVienna
                AxelVienna last edited by

                If you want to know if your QRadioButtons are inside our outside your layout, obtain and print the pointers upon creation. At the end of your code, read the widget pointers of your layout and compare them like that:

                for (int i = 0; i < yourLayout->count(); ++i)
                {
                  QWidget *widget = gridLayout->itemAt(i)->widget();
                  // qdebug or cout the pointer or write it to a vector
                }
                

                That is the only way to figure out if there is a bug in your complex code or a Qt misbehavior.

                C++ and Python walk into a bar. C++ reuses the first glass.

                SPlatten 1 Reply Last reply Reply Quote 2
                • SPlatten
                  SPlatten @AxelVienna last edited by SPlatten

                  @AxelVienna , I modified my code setting the objectName for each widget I then added:

                          if ( pobjWidget != nullptr ) {
                  //Set the object name
                              QString strID(strGetAttribute(clsXMLnode::mscszAttrID)),
                                      strName(mstrName);
                              if ( strID.isEmpty() != true ) {
                                  strName += ", id: " + strID;
                              }
                              pobjWidget->setObjectName(strName);
                          }
                          if ( pobjParent != nullptr && pobjParent->mpobjLayout != nullptr ) {
                              pobjParent->mpobjLayout->addWidget(pobjWidget);
                              for (int i = 0; i < pobjParent->mpobjLayout->count(); ++i) {
                                QWidget *widget = pobjParent->mpobjLayout->itemAt(i)->widget();
                                QString strWidget(widget->objectName()), strParent(widget->parentWidget()->objectName());
                  qDebug() << strWidget << ", parent: " << strParent;
                              }
                          }
                  

                  I checked in the debugger and strWidget is exactly what I expected to see, but there is still no difference in the output.

                  In the above the output is:

                  radiobutton, id: rdoM, parent: groupbox, id: enSEX
                  radiobutton, id: rdoF, parent: groupbox, id: enSEX
                  

                  This is using the XML:

                  <groupbox id="enSEX" eol="true" align="left" layout="vertical" 
                  		     dbfield="vcSex">
                  	<radiobutton id="rdoM" text="Male" default="true" position="0,0"/>
                  	<radiobutton id="rdoF" text="Female" position="1,0"/>
                  </groupbox>
                  

                  The debug output looks correct, but the screen still looks the same.

                  Kind Regards,
                  Sy

                  1 Reply Last reply Reply Quote 0
                  • AxelVienna
                    AxelVienna last edited by

                    As @Publicnamer said, creating an UI fully programmatically takes time and creates fuzz. Your debugging just tells us that two radio buttons are inside a group box. You have to look at the pointers themselves to make sure your layout is really the I’m your group box and the radio buttons are the ones you mean.

                    C++ and Python walk into a bar. C++ reuses the first glass.

                    SPlatten 1 Reply Last reply Reply Quote 0
                    • SPlatten
                      SPlatten @AxelVienna last edited by SPlatten

                      @AxelVienna , time is what I have, I know the nodes are correct, I used the information on this page as a guide:
                      https://doc.qt.io/qt-5/qtwidgets-widgets-groupbox-example.html

                          QGroupBox *groupBox = new QGroupBox(tr("Exclusive Radio Buttons"));
                      
                          QRadioButton *radio1 = new QRadioButton(tr("&Radio button 1"));
                          QRadioButton *radio2 = new QRadioButton(tr("R&adio button 2"));
                          QRadioButton *radio3 = new QRadioButton(tr("Ra&dio button 3"));
                      
                          radio1->setChecked(true);
                          QVBoxLayout *vbox = new QVBoxLayout;
                          vbox->addWidget(radio1);
                          vbox->addWidget(radio2);
                          vbox->addWidget(radio3);
                          vbox->addStretch(1);
                          groupBox->setLayout(vbox);
                      
                          return groupBox;
                      }
                      

                      My clsQtGroupBox is derived from my clsXMLnode class, this class has a member called mpobjLayout which is created when the node has a layout attribute. The group box node has a layout attribute and thats why it has a layout, if the parent of the radio buttons has a layout then they are added to the layout and the layout is set as the layout of the group box. I just can't see how my code differs from the example.

                      Each instance of clsXMLnode has a QWidget which is QGroupBox, QRadioButton etc.

                      Kind Regards,
                      Sy

                      SGaist 1 Reply Last reply Reply Quote 0
                      • AxelVienna
                        AxelVienna last edited by

                        @SPlatten said in Layout, widgets not inside ???:

                        if the parent of the radio buttons has a layout then they are added to the layout

                        That may be the problem. What if the parent hasn’t got a layout (yet)? Does your code throw an exception, returns an error or just stops? Or does it place the buttons outside the group box? I tend to believe that your code provokes the behaviour since I have never seen a bug in Qt that fiddles with widget assignments.

                        C++ and Python walk into a bar. C++ reuses the first glass.

                        SPlatten 1 Reply Last reply Reply Quote 2
                        • SPlatten
                          SPlatten @AxelVienna last edited by

                          @AxelVienna , I manage everything, only the nodes I add have widgets and only the widgets I assign a layout have a layout… unless QT is doing something I’m not aware of.

                          Kind Regards,
                          Sy

                          1 Reply Last reply Reply Quote 0
                          • AxelVienna
                            AxelVienna last edited by

                            A bold statement…. A lot of volunteers have read through your posts, tried to help and advise. If there are reasons to maintain your approach and you can’t find the bug, you have to hire an expert.

                            C++ and Python walk into a bar. C++ reuses the first glass.

                            1 Reply Last reply Reply Quote 1
                            • SGaist
                              SGaist Lifetime Qt Champion @SPlatten last edited by

                              @SPlatten said in Layout, widgets not inside ???:

                              I just can't see how my code differs from the example.

                              Parent handling from child widgets, that's the main difference I already suggested to avoid.

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

                              SPlatten 1 Reply Last reply Reply Quote 1
                              • JoeCFD
                                JoeCFD last edited by JoeCFD

                                @SPlatten said in Layout, widgets not inside ???:

                                QGroupBox *groupBox = new QGroupBox(tr("Exclusive Radio Buttons"));
                                
                                QRadioButton *radio1 = new QRadioButton(tr("&Radio button 1"));
                                QRadioButton *radio2 = new QRadioButton(tr("R&adio button 2"));
                                QRadioButton *radio3 = new QRadioButton(tr("Ra&dio button 3"));
                                
                                radio1->setChecked(true);
                                QVBoxLayout *vbox = new QVBoxLayout;
                                vbox->addWidget(radio1);
                                vbox->addWidget(radio2);
                                vbox->addWidget(radio3);
                                vbox->addStretch(1);
                                groupBox->setLayout(vbox);
                                
                                return groupBox;
                                
                                    auto groupBox = new QGroupBox(tr("Exclusive Radio Buttons"), this );
                                
                                    auto radio1 = new QRadioButton(tr("&Radio button 1"), groupBox);
                                    auto radio2 = new QRadioButton(tr("R&adio button 2"), groupBox);
                                    auto radio3 = new QRadioButton(tr("Ra&dio button 3"), groupBox);
                                
                                    auto button_group = new QButtonGroup;
                                    button_group->addButton(radio1) ; 
                                    button_group->addButton(radio2) ;
                                    button_group->addButton(radio3) ;
                                    button_group->setExclusive( true );
                                    radio1->setChecked(true);
                                
                                    auto vbox = new QVBoxLayout( groupBox );
                                    vbox->addWidget(radio1);
                                    vbox->addWidget(radio2);
                                    vbox->addWidget(radio3);
                                    vbox->addStretch(1);
                                
                                    return groupBox;
                                
                                SPlatten 1 Reply Last reply Reply Quote 0
                                • JoeCFD
                                  JoeCFD last edited by JoeCFD

                                      QString group_style_sheet = QString("QGroupBox{border: %1px solid gray;border-radius: %2px;margin-top: %3px;}" )
                                                                                                           .arg( m_groupBorderThickness )
                                                                                                          .arg( m_groupBorderRadius )
                                                                                                          .arg( text_font_size * 1.6 );
                                  

                                  Also you may need to set group style sheet to move text to the top of group frame. I do use it. Otherwise, the title text may push the radio buttons out of the group frame. Set minimum height to your group box.
                                  If you do not want to set border properties, it is OK. But it is better to set margin top which is related to your group font size. Play with font size and parameter 1.6 and you will be able to move the radio buttons into the group frame.

                                  1 Reply Last reply Reply Quote 0
                                  • SPlatten
                                    SPlatten @JoeCFD last edited by SPlatten

                                    @JoeCFD, I'm not sure what you are demonstrating here? The section of code I pasted comes directly from the Qt link, also posted.

                                    What purpose does the QButtonGroup serve?

                                    I edited my XML and applied the style:

                                    <groupbox id="enSEX" eol="true" align="left" layout="vertical" 
                                    		  dbfield="vcSex" properties="QGroupBox { border-radius: 8px; background-color:#ff0000; };">
                                    	<radiobutton id="rdoM" text="Male" default="true" position="0,0"/>
                                    	<radiobutton id="rdoF" text="Female" position="1,0"/>
                                    </groupbox>
                                    

                                    Here is the result:
                                    Screenshot 2021-10-18 at 20.37.30.png

                                    Kind Regards,
                                    Sy

                                    JoeCFD 1 Reply Last reply Reply Quote 0
                                    • SPlatten
                                      SPlatten @SGaist last edited by

                                      @SGaist , if only I could show you the rest of my code, when I create any widget I pass the parent widget to the constructor that creates the new widget.

                                      Kind Regards,
                                      Sy

                                      1 Reply Last reply Reply Quote 0
                                      • JoeCFD
                                        JoeCFD @SPlatten last edited by JoeCFD

                                        @SPlatten said in Layout, widgets not inside ???:

                                        QButtonGroup

                                        QButtonGroup serves making radio buttons exclusive. It is a common use. Otherwise, you need to handle them. Works for other buttons as well.
                                        Adding stylesheet with margin-top will help you move the radio buttons into the group box(set some minimum size to the groupbox to accomodate these buttons). I had the same problem as yours before. I solved the issue with stylesheet. Did you notice your title text("Exclusive Radio Buttons") does not show because it is inside the group box. The first radio button is there too.

                                        SPlatten 1 Reply Last reply Reply Quote 1
                                        • SPlatten
                                          SPlatten @JoeCFD last edited by

                                          @JoeCFD , thank you, so is this a Qt bug? as the link I posted before doesn't use QButtonGroup ?

                                          Kind Regards,
                                          Sy

                                          JoeCFD 1 Reply Last reply Reply Quote 0
                                          • JoeCFD
                                            JoeCFD @SPlatten last edited by JoeCFD

                                            @SPlatten It is true that that is a bug in the example. You copied it from there. If qbuttongroup is not used, you have to have a slot onButtonClicked to toggle them(messy). Sometimes, you may need it for your app.

                                            QButtonGroup is very helpful. Now you know how to use it.

                                            SPlatten 1 Reply Last reply Reply Quote 1
                                            • First post
                                              Last post