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.
    • 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
                                    • JoeCFD
                                      JoeCFD @SPlatten last edited by JoeCFD

                                      @SPlatten
                                      Dragged Group Box from Containers palette and dropped onto centralWidget
                                      Dragged Radio Button from Buttons palette
                                      Dragged Radio Button from Buttons palette
                                      Dragged Radio Button from Buttons palette
                                      right click inside qgroupbox and select layout->Lay out Vertically ---> size policy is added here automatically.
                                      Edited text attribute for each control

                                      do this for each major layout.

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

                                        @JoeCFD , This was just an exercise using Qt Creator to see what it does and why the works compared to coding it by hand....

                                        Kind Regards,
                                        Sy

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

                                          @SPlatten
                                          group layout

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

                                            @JoeCFD , can you not paste the source or post what you did?

                                            Kind Regards,
                                            Sy

                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post