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Anchoring the widgets for resizing with the form

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  • nulluseN nulluse

    I think I misunderstood the correlation between the layouts in Qt Designer and the layouts mentioned in the tutorials. I thought that by layout they meant dropping one of the very top 3 components from the Qt Designer toolbox onto a form and adding all widgets to the layout, as I did not know that layout was something different and had to be accessed through a pop up menu instead.

    kshegunovK Offline
    kshegunovK Offline
    kshegunov
    Moderators
    wrote on last edited by
    #10

    @nulluse said:

    I think I misunderstood the correlation between the layouts in Qt Designer and the layouts mentioned in the tutorials. I thought that by layout they meant dropping one of the very top 3 components from the Qt Designer toolbox onto a form and adding all widgets to the layout, as I did not know that layout was something different and had to be accessed through a pop up menu instead.

    It's basically the same thing, only the way the code is generated is a bit different. When you drop a layout from the toolbox, it's inserted as a child layout (layouts can be nested) to the widget's layout. If your widget doesn't have a layout (which is the default) it floats around. When you use the context menu, you set the layout of the widget, hence your elements are not floating. In code this'd look like this:

    QWidget * widget; //< The widget initialized from the form
    
    // This is approximately what's generated when you drag a layout from the toolbox
    QLayout * droppedFromToolbox; //< The layout that's generated when you drag it from the toolbox
    QLayout * widgetLayout = widget->layout();
    if (widgetLayout)
       widgetLayout ->addItem(droppedFromToolbox);
    
    // This is what's generated (again approximately) when you use the context menu.
    QLayout * fromContextMenu; //< The layout selected from the context menu
    widget->setLayout(fromContextMenu);
    

    You can see those are a bit different, but work on the same principle.

    Kind regards.

    Read and abide by the Qt Code of Conduct

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    • nulluseN Offline
      nulluseN Offline
      nulluse
      wrote on last edited by
      #11

      After reading more on this I realize that the concept of layouts (also used in Android etc) is horrible comparing with straightforward, flexible and easy to set up system of anchors.
      With the layouts you have to

      1. set up your form for a layout before adding any widgets

      if you missed #1 you are summarily screwed.

      1. choose by way of trial and error the layout that least mucks up the intended design
      2. freeze many widgets by entering min and max sizes (typing tons of numbers)

      all instead of flipping the yes/no anchors of the widgets.

      Looks like Qt came to their senses in Qt Quick (whatever it is) which now supports the anchors, but not in the regular .ui files.

      To sum it up, this is a very counter-intuitive niche concept where the UI developer is totally at the mercy of the pre-defined layouts and once that is chosen, QtDesigner does not even support full undo function. If you want to support nothing but devices and smartphones, this is probably Okay, but for a normal desktop layouts are very counter-intuitive and counter-productive.

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      • jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by
        #12

        "niche concept"?
        Are you sure layouts are a niche concept?
        As far as I know Java GUI for example uses layouts as well (see https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html). I like layouts - they are very flexible and powerful.

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

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        • nulluseN Offline
          nulluseN Offline
          nulluse
          wrote on last edited by
          #13

          Adding a layout to the UI elements on a form resizes and rearranges them all and it is not possible to change their sizes once they are in a layout. How's that powerful and flexible?

          mrjjM 1 Reply Last reply
          0
          • nulluseN nulluse

            Adding a layout to the UI elements on a form resizes and rearranges them all and it is not possible to change their sizes once they are in a layout. How's that powerful and flexible?

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #14

            @nulluse
            The layout define the size.Not reversed.
            If you dont want the layout size for all widgets ,
            u can then adjust with min/max sizes on individual widgets.
            You can also instruct layout if u want to be greedy and use all space/and or other options.

            nulluseN 1 Reply Last reply
            0
            • mrjjM mrjj

              @nulluse
              The layout define the size.Not reversed.
              If you dont want the layout size for all widgets ,
              u can then adjust with min/max sizes on individual widgets.
              You can also instruct layout if u want to be greedy and use all space/and or other options.

              nulluseN Offline
              nulluseN Offline
              nulluse
              wrote on last edited by
              #15

              @mrjj said:

              @nulluse
              If you dont want the layout size for all widgets ,
              u can then adjust with min/max sizes on individual widgets.
              You can also instruct layout if u want to be greedy and use all space/and or other options.

              Exactly! This is double work, and very tedious one, versus defining the anchors.
              The anchors do not require defining fixed sizes.

              mrjjM kshegunovK 2 Replies Last reply
              0
              • nulluseN nulluse

                @mrjj said:

                @nulluse
                If you dont want the layout size for all widgets ,
                u can then adjust with min/max sizes on individual widgets.
                You can also instruct layout if u want to be greedy and use all space/and or other options.

                Exactly! This is double work, and very tedious one, versus defining the anchors.
                The anchors do not require defining fixed sizes.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #16

                @nulluse
                Yeah but layouts dont either.
                Its assumed u want same size for all.
                So only if u dont , u set it.
                Its not double work as often NOT needed.
                I want same size for all anyway.
                and u can have margins if u want and many other nice tweaks.

                nulluseN 1 Reply Last reply
                0
                • nulluseN nulluse

                  @mrjj said:

                  @nulluse
                  If you dont want the layout size for all widgets ,
                  u can then adjust with min/max sizes on individual widgets.
                  You can also instruct layout if u want to be greedy and use all space/and or other options.

                  Exactly! This is double work, and very tedious one, versus defining the anchors.
                  The anchors do not require defining fixed sizes.

                  kshegunovK Offline
                  kshegunovK Offline
                  kshegunov
                  Moderators
                  wrote on last edited by
                  #17

                  @nulluse said:

                  Exactly! This is double work, and very tedious one, versus defining the anchors.
                  The anchors do not require defining fixed sizes.

                  Neither do layouts. There are things called resize policies and stretch factors, which I suppose you should take a look at. Also how do you anchor two elements back to back such that one of them takes 2/3 of the space and one 1/3, ain't it necessary to go and set that manually?

                  Read and abide by the Qt Code of Conduct

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                  • nulluseN Offline
                    nulluseN Offline
                    nulluse
                    wrote on last edited by
                    #18

                    And that's even more work vs flipping yes/no anchors and not having to worry about anything else.

                    1 Reply Last reply
                    0
                    • mrjjM mrjj

                      @nulluse
                      Yeah but layouts dont either.
                      Its assumed u want same size for all.
                      So only if u dont , u set it.
                      Its not double work as often NOT needed.
                      I want same size for all anyway.
                      and u can have margins if u want and many other nice tweaks.

                      nulluseN Offline
                      nulluseN Offline
                      nulluse
                      wrote on last edited by
                      #19

                      @mrjj said:

                      @nulluse
                      Yeah but layouts dont either.
                      Its assumed u want same size for all.
                      So only if u dont , u set it.
                      Its not double work as often NOT needed.
                      I want same size for all anyway.
                      and u can have margins if u want and many other nice tweaks.

                      You probably need to look at a system that uses anchors to realize how much more productive they allow the developers to be.

                      1 Reply Last reply
                      0
                      • nulluseN Offline
                        nulluseN Offline
                        nulluse
                        wrote on last edited by
                        #20

                        If the layouts are so wonderful, can anyone explain why specifying a horizontal layout for a form with 3 panels adds 9 pixel margin on all sides of the form? How can that margin be eliminated?

                        ? 1 Reply Last reply
                        0
                        • nulluseN nulluse

                          If the layouts are so wonderful, can anyone explain why specifying a horizontal layout for a form with 3 panels adds 9 pixel margin on all sides of the form? How can that margin be eliminated?

                          ? Offline
                          ? Offline
                          A Former User
                          wrote on last edited by
                          #21

                          @nulluse said:

                          How can that margin be eliminated?

                          Simple: For centralWidget set layoutLeftMargin, layoutRightMargin, layoutTopMargin, layoutBottomMargin, and layoutSpacing all to 0. Default is 9, resp. 6.

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                          • ? Offline
                            ? Offline
                            A Former User
                            wrote on last edited by
                            #22

                            BTW: If you want a fancy GUI that doesn't look / behave natively then you can use QtQuick for that. Besides layouts it has anchors, too.

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