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    Unsolved Layout, widgets not inside ???

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    • 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
        • SPlatten
          SPlatten @JoeCFD last edited by

          @JoeCFD , I'll try to describe what I'm working on, I am developing an engine that reads the configuration of what will be contained in a window from an XML set of files. The XML can be edited and reloaded into the engine with no source code changes required, the engine renders the content of the XML file converting it to widgets, as an example:

          <?xml version="1.0" encoding="utf-8"?>
          <form title="Test form" id="frmTest" hspacing="0" vspacing="0" width="480"
          	  height="480" modal="false">
          	<entry control="listwidget" label="Select:" id="enSEL"
          		   cols="24" rows="1" mode="single" excludeFromChangeCheck="true"
          		   resetPropertiesOnChange="true" eol="true">
          		<subscriber signal="itemSelectionChanged" 
          					target="simon2.js@listWidgetHandler"/>		
          		<subscriber signal="currentItemChanged"
          					target="simon2.js@listWidgetChanged"/>		
          	</entry>
          	<entry control="lineedit" label="First name:" id="enFN" eol="true"
          		   cols="24" maxlength="24" accept="alpha_only" dbfield="vcFirstName"/>
          	<entry control="lineedit" label="Surnname:" id="enSN" eol="true"
          		   cols="24" maxlength="24" accept="alpha_only" dbfield="vcSurName"/>
          	<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>
          	<entry control="checkbox" label="Employed:" id="enEmp" eol="true"
          		  dbfield="intEmployed"/>
          	<entry control="textedit" label="Address:" id="enADR" eol="true"
          		   maxlength="256" accept="alpha_numeric" cols="24" rows="5"
          		   dbfield="vcAddress"/>
          	<groupbox id="enButtons" eol="true" align="right" layout="horizontal">		   
          		<button id="btnApply" api="applyChanges">
          			<subscriber signal="clicked" target="simon2.js@applyButton"/>
          		</button>
          		<button id="btnUndo" api="undoChanges"/>
          		<button id="btnOK" api="submitAndClose"/>	
          	</groupbox>			
          	<on saveChanges="Save changes before changing selection?"/>
          	<on setup="simon2.js@setupForm"/>
          </form>
          

          I'm still having problems in getting the layout and groupbox to work properly, now I am getting a problem where after setting the layout, the code jumps into QWidgetRepaintManager::removeDirtyWidget.

          This happens immediately after I call setLayout on the QGroupBox widget.

          Kind Regards,
          Sy

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

            Are you giving a parent to the layout before calling setLayout ?

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

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

              @SPlatten Good stuff. Can you please show your code for building layout? XML file has only properties of widgets and can not tell why layout goes wrong.

              A good practice for debugging is to keep a small GUI case with ui file generated from qt designer and then you compile this case. From ui_*** file created in build, you can see how widgets are laid out. In this way, you can save a lot of time. I believe your time worths some good money.

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

                @JoeCFD , the issue I have now is that I've created a mock up using Qt Creator and in this I added a QGroupBox, then into this I added a QVBoxLayout then added three QRadioButtons, I then examined the document as XML and everything looked fine, when I build and ran it also looked fine.

                However I'm having difficulty replicating this, I have a QGroupBox, I've created a layout and used setLayout on the QGroupBox widget, so far so good....but now I want to set the parent to the layout but can't, because the layouts are not derived from QWidget and calling ->widget() on the layout returns nullptr. I want to use the layout like a widget so I can add other widgets to it using the layout as a parent.

                Kind Regards,
                Sy

                jsulm 1 Reply Last reply Reply Quote 0
                • jsulm
                  jsulm Lifetime Qt Champion @SPlatten last edited by

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

                  I want to use the layout like a widget so I can add other widgets to it using the layout as a parent.

                  You can't. A layout is not QWidget. And I'm wondering why you want to do this? There is already a simple way to add a widget to a layout.

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

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

                    @jsulm, I've tried implementing this:

                                QLayout* pobjLayout(nullptr);
                                if ( pobjParent != nullptr ) {
                        //Does the parent have a layout?
                                    pobjLayout = pobjParent->pobjGetLayout();
                                    if ( pobjLayout != nullptr ) {
                        //Yes, clear the pobjParWidget widget
                                        pobjParWidget = nullptr;
                                    }
                                }
                                pobjWidget = qobject_cast<QWidget*>(clsCNT::pCreate(this,
                                                                                    mstrName,
                                                                                    strCSS,
                                                                                    slstProperties,
                                                                                    pobjParWidget));
                                if ( pobjLayout != nullptr ) {
                        //Add the widget to the layout
                                    pobjLayout->addWidget(pobjWidget);                
                                }
                    

                    However this doesn't work either, the radio buttons still appear outside of the groupbox and not in the layout, I've single stepped the logic, so the radio button widgets are added to the layout.

                    Kind Regards,
                    Sy

                    jsulm 1 Reply Last reply Reply Quote 0
                    • jsulm
                      jsulm Lifetime Qt Champion @SPlatten last edited by

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

                      pobjLayout->addWidget(pobjWidget)

                      Is this line executed?
                      If it is: to which widget does this layout belong? What is pobjGetLayout() actually doing?

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

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

                        @jsulm , yes, it is. I've used setObjectName to assign the layouts and widgets the id's they have in the XML.

                        In the above pobjLayout points to a QVBoxLayout and pobjWidget points to a QRadioButton.

                        The layout is appended to a QGroupBox via setLayout.

                        Kind Regards,
                        Sy

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

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

                          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 );

                          override the style sheet of group box in the xml with
                          int margin_top = font().pointSize()* 1.6;
                          QString group_style_sheet = QString("QGroupBox{border: 2px solid gray;border-radius: 8px;margin-top: %1px;}" ).arg( margin_top );
                          You try to hardcode it and see if it works.

                          SPlatten JoeCFD 2 Replies Last reply Reply Quote 0
                          • SPlatten
                            SPlatten @JoeCFD last edited by SPlatten

                            @JoeCFD , thank you appreciated, why isn't this kind of thing required when positioning and using Qt Creator? This is the XML copied from the UI file which works perfectly.

                               <widget class="QGroupBox" name="groupBox">
                                <property name="geometry">
                                 <rect>
                                  <x>120</x>
                                  <y>170</y>
                                  <width>301</width>
                                  <height>201</height>
                                 </rect>
                                </property>
                                <property name="title">
                                 <string>GroupBox</string>
                                </property>
                                <widget class="QWidget" name="verticalLayoutWidget">
                                 <property name="geometry">
                                  <rect>
                                   <x>9</x>
                                   <y>29</y>
                                   <width>291</width>
                                   <height>161</height>
                                  </rect>
                                 </property>
                                 <layout class="QVBoxLayout" name="verticalLayout">
                                  <item>
                                   <widget class="QRadioButton" name="Radio1">
                                    <property name="text">
                                     <string>Radio1</string>
                                    </property>
                                   </widget>
                                  </item>
                                  <item>
                                   <widget class="QRadioButton" name="Radio2">
                                    <property name="text">
                                     <string>Radio2</string>
                                    </property>
                                   </widget>
                                  </item>
                                  <item>
                                   <widget class="QRadioButton" name="Radio3">
                                    <property name="text">
                                     <string>Radio3</string>
                                    </property>
                                   </widget>
                                  </item>
                                 </layout>
                                </widget>
                               </widget>
                              </widget>
                             </widget>
                            

                            No sign of any styles or positioning, I'm now trying to reverse the logic to see where the difference is.

                            This is what I found in the debugger looking at how the above XML appears:
                            Screenshot 2021-10-20 at 18.06.21.png
                            What I don't understand is what is **[0] "verticalLayout" as a child ?

                            Drill down a bit more into this layout:
                            Screenshot 2021-10-20 at 18.25.22.png
                            It appears that the groupBox has one child which I agree with and expect verticalLayoutWidget, the layout has 4 children which I didn't expect:

                            • verticalLayout
                            • Radio1
                            • Radio2
                            • Radio3

                            What is verticalLayout and where did it come from, it has no children, it isn't in the XML layout ?

                            Just to clarify, just in case the screenshot isn't clear it shows:

                            groupBox
                                verticalLayout
                                    verticalLayoutWidget
                                    Radio1
                                    Radio2
                                    Radio3
                            

                            Its verticalLayoutWidget that is the mystery...

                            Another edit, looked again at the XML and it does match the debugger screenshot. It looks like there is a fiddle in that the first widget is not the QVBoxLayout but a Widget called "verticalLayoutWidget".

                            Kind Regards,
                            Sy

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

                              @SPlatten group box has a layout for three radio buttons and is a child as well. In total, it has 4 children.

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

                                @JoeCFD, please see edit, bit at the bottom.

                                Kind Regards,
                                Sy

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

                                  @SPlatten You created a verticalLayoutWidget inside a group box which has 4 children:
                                  verticalLayout
                                  radio1
                                  radio2
                                  radio3

                                  verticalLayoutWidget is not needed. the parent of verticalLayoutWidget is groupBox.

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

                                    @JoeCFD , to repeat what I did:

                                    • Dragged Group Box from Containers palette and dropped onto centralWidget
                                    • Dragged Vertical Layout from Layouts palette and dropped onto Group Box
                                    • Dragged Radio Button from Buttons palette and dropped onto Vertical Layout
                                    • Dragged Radio Button from Buttons palette and dropped onto Vertical Layout
                                    • Dragged Radio Button from Buttons palette and dropped onto Vertical Layout
                                    • Edited text attribute for each control

                                    Thats it, one layout not two. Take a look at the XML I posted, its pretty clear and its the actual elements that are generated from this XML that I'm questioning.

                                    Kind Regards,
                                    Sy

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

                                      @JoeCFD
                                      if there is no title for the group, set top margin to 0
                                      QString group_style_sheet = QString("QGroupBox{border: 2px solid gray;border-radius: 8px;margin-top: 0px;}" );

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

                                        @JoeCFD , but why? What I'm trying to understand is why if done in Qt Creator WYSIWYG, no fiddles are required and it works, but the code generated from the XML just doesn't add up.

                                        Kind Regards,
                                        Sy

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

                                          @SPlatten Could be some global settings in your project which cause this problem. Since all my widgets are customized, I do not complain about this. BTW, border-radius setting is bad sometimes when screen resolution is not high enough. Often, I have to set it to 0.

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

                                            @JoeCFD , please see latest edit....

                                            Kind Regards,
                                            Sy

                                            JoeCFD 1 Reply Last reply Reply Quote 0
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