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    Call for Presentations - Qt World Summit

    Solved Adding widgets dynamically to layout, causes to them to be misplaced

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    • Petross404_Petros S
      Petross404_Petros S last edited by

      As shown here, when I add my widgets to the main window, they are misplaced.

      void QtDice::enableUserWidget()
      {
      	userwidget = new UserWidget("", this);
      	m_ui->verticalLayout_Widget->addWidget(userwidget);
      	setLayout(m_ui->verticalLayout_Widget);
      }
      

      Can someone give me a hint what should I look for?

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

        Hi,

        Why are you calling setLayout ? Since you have a designer based UI you likely already have the layout set on something, no ?

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        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        Petross404_Petros S 1 Reply Last reply Reply Quote 1
        • Petross404_Petros S
          Petross404_Petros S @SGaist last edited by

          @SGaist said in Adding widgets dynamically to layout, causes to them to be misplaced:

          Hi,

          Why are you calling setLayout ? Since you have a designer based UI you likely already have the layout set on something, no ?

          I added it as a last attempt. Nothing changed though, the same misplacement happened before.

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          • SGaist
            SGaist Lifetime Qt Champion last edited by

            It looks like the label isn't in the vertical layout, is it ?

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            Petross404_Petros S 1 Reply Last reply Reply Quote 0
            • Petross404_Petros S
              Petross404_Petros S @SGaist last edited by

              @SGaist It's in a grid layout. Why do you suspect it?

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

                Since you are adding a widget to a vertical layout and said widgets comes on top of another one then that other one is not in the same layout (or any layout for that matter)

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                Petross404_Petros S 1 Reply Last reply Reply Quote 0
                • Petross404_Petros S
                  Petross404_Petros S @SGaist last edited by

                  I am thinking that I tried vertical and grid layouts, but not horizontal. Before I try this next morning, is there something I am missing with spacers?

                  I also could not solve this way.

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                  • SGaist
                    SGaist Lifetime Qt Champion last edited by

                    Where exactly is that widget supposed to come ? And can there be more than one ?

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                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • Petross404_Petros S
                      Petross404_Petros S last edited by

                      In the third picture of the link, there is a layout selected which is called verticalLayout_Widgets. The widget is supposed to be placed there and only once but that is something I took care with some code.

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                      • SGaist
                        SGaist Lifetime Qt Champion last edited by

                        Why not in designer using the promotion feature ?

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                        Petross404_Petros S 1 Reply Last reply Reply Quote 2
                        • Petross404_Petros S
                          Petross404_Petros S @SGaist last edited by

                          @SGaist What is the promotion feature?

                          mrjj 1 Reply Last reply Reply Quote 0
                          • mrjj
                            mrjj Lifetime Qt Champion @Petross404_Petros S last edited by mrjj

                            @Petross404_Petros-S
                            Hi
                            Promotion feature is a super replace at runtime.
                            During design, you say this QWidget should become this type when run.
                            Designer will then use the actual type so when app is run, your control is
                            used and not the plain widget.
                            http://doc.qt.io/qt-5/designer-using-custom-widgets.html

                            This allows light integration where you can desgin with your custom widget but do not have to make a full
                            plugin for integration.

                            Petross404_Petros S 1 Reply Last reply Reply Quote 4
                            • Petross404_Petros S
                              Petross404_Petros S @mrjj last edited by

                              @mrjj I will read about this. I didn't know this thing even existed.

                              1 Reply Last reply Reply Quote 0
                              • Petross404_Petros S
                                Petross404_Petros S last edited by

                                What happens it that my widget is now loaded upon startup, while I need it to be loaded if and when the use clicks a checkbox. I guess I wan't clear about the term dynamic loading...

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                                • mrjj
                                  mrjj Lifetime Qt Champion last edited by

                                  Hi

                                  • my widget is now loaded upon startup

                                  you mean, after you used promotion, they are constructed with the main window
                                  or where you promoted them ?
                                  This is expected and often you can just hide them, and then show if enabled in checkbox.
                                  If you strictly really need only to construct them on demand, you cant use promotion directly.

                                  1 Reply Last reply Reply Quote 1
                                  • Petross404_Petros S
                                    Petross404_Petros S last edited by Petross404_Petros S

                                    @mrjj Yes, I think so too. Right now I managed to put the widget on the layout with the use of a vertical spacer (enabled and shown here). After the widget is created and shown, the whole window expands a little so the layout and it's widget can be visible.

                                    The thing is that I can't "resize" the layout(?) and the whole window to it's original, smaller size. It seems that once the layout is "stretched" to show the widget, it stays that way when the widget is deleted. This leaves an ugly void space where the widget was placed.

                                    mrjj 1 Reply Last reply Reply Quote 0
                                    • mrjj
                                      mrjj Lifetime Qt Champion @Petross404_Petros S last edited by

                                      @Petross404_Petros-S
                                      Hi
                                      Normally layouts will "contract". I have yet to experience
                                      one that leaves a hole if i remove widget. Maybe boxlayout.

                                      Petross404_Petros S 1 Reply Last reply Reply Quote 0
                                      • Petross404_Petros S
                                        Petross404_Petros S @mrjj last edited by Petross404_Petros S

                                        @mrjj

                                        Maybe boxlayout.

                                        You mean I should try boxlayout? Designer doesn't have one though...

                                        @Global-Moderators Please, correct my title. I meant to write "...causes them to be misplaced".

                                        mrjj 1 Reply Last reply Reply Quote 0
                                        • mrjj
                                          mrjj Lifetime Qt Champion @Petross404_Petros S last edited by mrjj

                                          @Petross404_Petros-S
                                          no, no i mean maybe box layout would / might/perhaps leave a hole but all other layouts would
                                          contract if you remove a widget.

                                          There is something else wrong.
                                          Do you use TakeAt to remove from layout ?
                                          https://doc.qt.io/qt-5.10/qboxlayout.html#takeAt
                                          Its the only valid way to remove a widget.

                                          Petross404_Petros S 1 Reply Last reply Reply Quote 0
                                          • Petross404_Petros S
                                            Petross404_Petros S @mrjj last edited by Petross404_Petros S

                                            Well, one thing I know is that the custom widget's size constraints had to set to a minimum. It used quite a lot of space so it was centered on top of another layout/widget. Now it's loaded where it should, but after it's deletion there still is a void space.

                                            That's the code:

                                            void QtDice::enableUserWidget()
                                            {
                                            	userwidget = new UserWidget(this);
                                            	m_ui->gridLayout_Widget->addWidget(userwidget);
                                            }
                                            
                                            void QtDice::deleteUserWidget()
                                            {
                                            	m_ui->gridLayout_Widget->removeWidget(userwidget);
                                            	userwidget->setParent(nullptr);
                                            	delete userwidget;
                                            }
                                            

                                            Other suspects could be the main form (i.e. the QtDice qmainwindow) and it's size policies or the vertical spacer. I tried almost every combination and I am out of ideas.

                                            Do you use TakeAt to remove from layout ?

                                            Ebook Mastering Qt5, suggested the QLayout::removeWidget, so...

                                            mrjj 1 Reply Last reply Reply Quote 0
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