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  4. How do I subclass QDial to show notches values ?
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How do I subclass QDial to show notches values ?

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  • mrjjM mrjj

    @Punt
    Hi the
    "Painting zone" is the size of the QDial
    You cannot paint outside it using -100 for x
    It clip clip as you saw.
    You cannot increase this area unless its ok the QDial also becomes bigger.

    PuntP Offline
    PuntP Offline
    Punt
    wrote on last edited by Punt
    #17

    @mrjj
    Maybe I can reduce the QDial then ? Like the radius of the circle ?

    Or last idea : I create a new class, in which I put an "aera" like a Widget (?), I add a QDial and I draw my "notches-text-values" (Still don't know how to call it xDD)

    mrjjM 1 Reply Last reply
    0
    • PuntP Punt

      @mrjj
      Maybe I can reduce the QDial then ? Like the radius of the circle ?

      Or last idea : I create a new class, in which I put an "aera" like a Widget (?), I add a QDial and I draw my "notches-text-values" (Still don't know how to call it xDD)

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #18

      @Punt
      well maybe. i dont think so.
      I think it uses all its area.
      else u need to copy the paint function and alter it to allow
      to paint smaller than the area.
      You should look in source and see what it uses to better understand it.

      1 Reply Last reply
      2
      • mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #19

        sorry I miss last part.

        Yes also option to make a composite class where u have QDial in center ( in a layout) and
        let ur class paint on top of it all.

        PuntP 1 Reply Last reply
        1
        • mrjjM mrjj

          sorry I miss last part.

          Yes also option to make a composite class where u have QDial in center ( in a layout) and
          let ur class paint on top of it all.

          PuntP Offline
          PuntP Offline
          Punt
          wrote on last edited by
          #20

          @mrjj
          I think I'll go for it !
          It's the easiest solution I guess...

          I'm done for today, I'll try it tomorrow :)
          Thanks :)

          1 Reply Last reply
          0
          • mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #21

            but since you already subclassed it, why not make it work 100% like u want?
            Also need to be able to give list for the "tick words" etc.
            So find the source and see the paitnevent
            maybe its easy to modify for what u want.

            mrjjM PuntP 2 Replies Last reply
            2
            • mrjjM mrjj

              but since you already subclassed it, why not make it work 100% like u want?
              Also need to be able to give list for the "tick words" etc.
              So find the source and see the paitnevent
              maybe its easy to modify for what u want.

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #22

              void QDial::paintEvent(QPaintEvent *)
              {
              QStylePainter p(this);
              QStyleOptionSlider option;
              initStyleOption(&option);
              p.drawComplexControl(QStyle::CC_Dial, option);
              }

              So u can just change option.rect ( check name)
              and you can control the size of the dial.

              PuntP 1 Reply Last reply
              1
              • mrjjM mrjj

                but since you already subclassed it, why not make it work 100% like u want?
                Also need to be able to give list for the "tick words" etc.
                So find the source and see the paitnevent
                maybe its easy to modify for what u want.

                PuntP Offline
                PuntP Offline
                Punt
                wrote on last edited by
                #23

                @mrjj said:

                but since you already subclassed it, why not make it work 100% like u want?
                Also need to be able to give list for the "tick words" etc.
                So find the source and see the paitnevent
                maybe its easy to modify for what u want.

                If I create a composite class, I don't need anymore my subclass...
                Well I don't know, I'll check tomorrow if it's easy (Because i'll probably have to change another thing on a QDial => but that's another thing x) )

                I guess i'll update this topic tomorrow, so if someone has another idea, I take it :)

                Edit for your last message : I'll check tomorrow, I go home and I can't work there :p

                See you

                1 Reply Last reply
                1
                • mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #24

                  before u try composite, please try adjust paint first.
                  So little code.

                  1 Reply Last reply
                  0
                  • mrjjM mrjj

                    void QDial::paintEvent(QPaintEvent *)
                    {
                    QStylePainter p(this);
                    QStyleOptionSlider option;
                    initStyleOption(&option);
                    p.drawComplexControl(QStyle::CC_Dial, option);
                    }

                    So u can just change option.rect ( check name)
                    and you can control the size of the dial.

                    PuntP Offline
                    PuntP Offline
                    Punt
                    wrote on last edited by
                    #25

                    @mrjj said:

                    void QDial::paintEvent(QPaintEvent *)
                    {
                    QStylePainter p(this);
                    QStyleOptionSlider option;
                    initStyleOption(&option);
                    p.drawComplexControl(QStyle::CC_Dial, option);
                    }

                    So u can just change option.rect ( check name)
                    and you can control the size of the dial.

                    I can't do "option.something" ...

                    1 Reply Last reply
                    0
                    • mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by mrjj
                      #26

                      why not?
                      Look in help then?

                      http://doc.qt.io/qt-5/qstyleoption.html#rect-var

                      PuntP 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        why not?
                        Look in help then?

                        http://doc.qt.io/qt-5/qstyleoption.html#rect-var

                        PuntP Offline
                        PuntP Offline
                        Punt
                        wrote on last edited by Punt
                        #27

                        @mrjj
                        Now the problem is I can extend the area and write text in the right and in the bottom of the QDial (because the QDial is drawn (good english ?!) in the left-top (0,0) ). And I don't have any idea how to change that.. I searched if there is something like the position where qt draw of something like that, but didn't find it .. --'

                        1 Reply Last reply
                        0
                        • mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by mrjj
                          #28

                          hi
                          Not tested myself.
                          option.rect should control where QDial is
                          and the normal rect is your widget.

                          So if u set option.rect before
                          p.drawComplex

                          U should be able to move it around?

                          PuntP 1 Reply Last reply
                          0
                          • mrjjM mrjj

                            hi
                            Not tested myself.
                            option.rect should control where QDial is
                            and the normal rect is your widget.

                            So if u set option.rect before
                            p.drawComplex

                            U should be able to move it around?

                            PuntP Offline
                            PuntP Offline
                            Punt
                            wrote on last edited by
                            #29

                            @mrjj
                            Look, if I

                            option.rect.setX(20)
                            

                            this is just moving one part of the QDial --'
                            Gyazo

                            And what do you mean about the normal rect ?

                            The only rect I have is option.rect no ?!

                            mrjjM 1 Reply Last reply
                            0
                            • PuntP Punt

                              @mrjj
                              Look, if I

                              option.rect.setX(20)
                              

                              this is just moving one part of the QDial --'
                              Gyazo

                              And what do you mean about the normal rect ?

                              The only rect I have is option.rect no ?!

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #30

                              @Punt
                              Option has rect yes, used for the drawComplexControl call.
                              You own widget, also has rect, simply called rect or this->rect
                              which is the real area since the QDial is just painted.

                              PuntP 1 Reply Last reply
                              0
                              • mrjjM mrjj

                                @Punt
                                Option has rect yes, used for the drawComplexControl call.
                                You own widget, also has rect, simply called rect or this->rect
                                which is the real area since the QDial is just painted.

                                PuntP Offline
                                PuntP Offline
                                Punt
                                wrote on last edited by
                                #31

                                @mrjj

                                    rect().setRect(0,0,200,200);
                                    option.rect.setRect(30,30,100,100);
                                    p.drawText(120,120,"(120,120)");
                                    p.drawText(30,30,"(30,30)");
                                    p.drawText(200,200,"(200,200)");
                                

                                => Gyazo

                                I don't find anything to move ticks ...

                                mrjjM 1 Reply Last reply
                                0
                                • PuntP Punt

                                  @mrjj

                                      rect().setRect(0,0,200,200);
                                      option.rect.setRect(30,30,100,100);
                                      p.drawText(120,120,"(120,120)");
                                      p.drawText(30,30,"(30,30)");
                                      p.drawText(200,200,"(200,200)");
                                  

                                  => Gyazo

                                  I don't find anything to move ticks ...

                                  mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #32

                                  Hmm
                                  so it dont use option.rect() for the tick drawing.
                                  Strange.

                                  Alternatively
                                  new a layout
                                  set to your widget
                                  New a QDial
                                  add to layout
                                  adjust layout margins to get room for text.
                                  Paint the text in paintEvent.
                                  Remove the drawComplexControl etc.

                                  PuntP 1 Reply Last reply
                                  0
                                  • mrjjM mrjj

                                    Hmm
                                    so it dont use option.rect() for the tick drawing.
                                    Strange.

                                    Alternatively
                                    new a layout
                                    set to your widget
                                    New a QDial
                                    add to layout
                                    adjust layout margins to get room for text.
                                    Paint the text in paintEvent.
                                    Remove the drawComplexControl etc.

                                    PuntP Offline
                                    PuntP Offline
                                    Punt
                                    wrote on last edited by
                                    #33

                                    @mrjj
                                    In my subclass ?

                                    mrjjM 1 Reply Last reply
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                                    • PuntP Punt

                                      @mrjj
                                      In my subclass ?

                                      mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #34

                                      @Punt
                                      Yes
                                      In constructor
                                      so it becomes a composite widget with a normal QDial inside.
                                      You will also have to create some public signal to use from outside
                                      since you cannot directly connect to the QDail.

                                      mrjjM 1 Reply Last reply
                                      0
                                      • mrjjM mrjj

                                        @Punt
                                        Yes
                                        In constructor
                                        so it becomes a composite widget with a normal QDial inside.
                                        You will also have to create some public signal to use from outside
                                        since you cannot directly connect to the QDail.

                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by mrjj
                                        #35

                                        Hi
                                        yes that seems to be possible.

                                        https://www.dropbox.com/s/5hjry2pcb0mpsi2/myqdial.zip?dl=0
                                        I just did it in Creator for test. Using code in
                                        CustomDial is smarter.

                                        PuntP 1 Reply Last reply
                                        0
                                        • mrjjM mrjj

                                          Hi
                                          yes that seems to be possible.

                                          https://www.dropbox.com/s/5hjry2pcb0mpsi2/myqdial.zip?dl=0
                                          I just did it in Creator for test. Using code in
                                          CustomDial is smarter.

                                          PuntP Offline
                                          PuntP Offline
                                          Punt
                                          wrote on last edited by
                                          #36

                                          @mrjj

                                          Sorry was busy...
                                          I don't understand how to do it..
                                          I tried, when I want to use layout() this is crashing.. I tried different things but isn't working, I'm tired of this button x)

                                          mrjjM 1 Reply Last reply
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