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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

    Hi
    Your English is fine but its not clear how this Dial should look like

    So INSTEAD of values/small ticks on the Dial, you want text `?
    So first little tick is Hello etc ?

    PuntP Offline
    PuntP Offline
    Punt
    wrote on last edited by
    #5

    @mrjj
    Something like that :
    Gyazo Link

    mrjjM 1 Reply Last reply
    0
    • PuntP Punt

      @mrjj
      Something like that :
      Gyazo Link

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #6

      @Punt
      Ok
      You can sublass it and override the paintEvent
      make it paint as normal, and then paint the text on top.
      But you show 4 texts, do you have more for real app?

      PuntP 2 Replies Last reply
      0
      • mrjjM mrjj

        @Punt
        Ok
        You can sublass it and override the paintEvent
        make it paint as normal, and then paint the text on top.
        But you show 4 texts, do you have more for real app?

        PuntP Offline
        PuntP Offline
        Punt
        wrote on last edited by
        #7

        @mrjj
        I would like to have a subclass which will work with 3 to 6 values..

        Because, at the end, my app need to be adaptable/adjustable as the user(not me) want !

        1 Reply Last reply
        0
        • mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #8

          Hi
          Well then subclass will work best as you can add support
          for having a list of TickTexts or what u call them :)

          1 Reply Last reply
          0
          • mrjjM mrjj

            @Punt
            Ok
            You can sublass it and override the paintEvent
            make it paint as normal, and then paint the text on top.
            But you show 4 texts, do you have more for real app?

            PuntP Offline
            PuntP Offline
            Punt
            wrote on last edited by
            #9

            @mrjj said:

            @Punt
            Ok
            You can sublass it and override the paintEvent
            make it paint as normal, and then paint the text on top.
            But you show 4 texts, do you have more for real app?

            I know how to subclass & override, but "make it paint as normal and then paint the text", I don't have any idea how to do it ...

            mrjjM 1 Reply Last reply
            0
            • PuntP Punt

              @mrjj said:

              @Punt
              Ok
              You can sublass it and override the paintEvent
              make it paint as normal, and then paint the text on top.
              But you show 4 texts, do you have more for real app?

              I know how to subclass & override, but "make it paint as normal and then paint the text", I don't have any idea how to do it ...

              mrjjM Offline
              mrjjM Offline
              mrjj
              Lifetime Qt Champion
              wrote on last edited by
              #10

              @Punt
              Oh sorry being unclear
              When you have overridden paint
              in top you call the base class
              void mycooldial::paintEvent( ..
              QDial::PaintEvent(event); << call the normal paint

              then after u paint text on top of it.

              PuntP 1 Reply Last reply
              4
              • mrjjM mrjj

                @Punt
                Oh sorry being unclear
                When you have overridden paint
                in top you call the base class
                void mycooldial::paintEvent( ..
                QDial::PaintEvent(event); << call the normal paint

                then after u paint text on top of it.

                PuntP Offline
                PuntP Offline
                Punt
                wrote on last edited by
                #11

                @mrjj
                OK here I am :

                .h :

                #ifndef CUSTOMDIAL_H
                #define CUSTOMDIAL_H
                
                #include <QObject>
                #include <QDial>
                
                class CustomDial : public QDial
                {
                    Q_OBJECT
                
                public:
                
                    CustomDial(QWidget * parent = nullptr,
                               double knobRadius = 5,
                               double knobMargin = 5);
                
                private:
                
                    virtual void paintEvent(QPaintEvent*pe) override;
                
                };
                
                #endif // CUSTOMDIAL_H
                
                

                .cpp :

                #include "customdial.h"
                
                CustomDial::CustomDial(QWidget* parent,
                                       double knobRadius,
                                       double knobMargin)
                : QDial(parent)
                {
                    // Default range
                    QDial::setRange(0,100);
                }
                
                void CustomDial::paintEvent(QPaintEvent* pe)
                {    QDial::paintEvent(pe);
                
                }
                
                

                It seems to work, I have my QDial then I'll try to add my text...

                But I have :

                QMetaObject::connectSlotsByName: No matching signal for on_pushButton_pressed()
                QMetaObject::connectSlotsByName: No matching signal for on_pushButton_clicked()
                QMetaObject::connectSlotsByName: No matching signal for on_pushButton_released()
                QMetaObject::connectSlotsByName: No matching signal for on_dial_valueChanged(int)
                
                1 Reply Last reply
                0
                • mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  Hmm
                  you dont show any connect statements?

                  So this from other part of project.

                  This might happen if you add slot by right clicking in Creator and then later rename slot or the button/widget
                  Its not related to the subclass as such.

                  PuntP 1 Reply Last reply
                  0
                  • mrjjM mrjj

                    Hmm
                    you dont show any connect statements?

                    So this from other part of project.

                    This might happen if you add slot by right clicking in Creator and then later rename slot or the button/widget
                    Its not related to the subclass as such.

                    PuntP Offline
                    PuntP Offline
                    Punt
                    wrote on last edited by
                    #13

                    @mrjj
                    Oh sorry my bad to disturb you for this..
                    This is SLOT that I used earlier to try things with QDial --'

                    Ok I'll try to paint my text now :)

                    mrjjM 1 Reply Last reply
                    0
                    • PuntP Punt

                      @mrjj
                      Oh sorry my bad to disturb you for this..
                      This is SLOT that I used earlier to try things with QDial --'

                      Ok I'll try to paint my text now :)

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

                      @Punt
                      Np. :)

                      1 Reply Last reply
                      0
                      • PuntP Offline
                        PuntP Offline
                        Punt
                        wrote on last edited by
                        #15

                        Ok, I understand how it works.. I have an idea to determinate the position of my texts (unit cercle I guess).

                        But I have a problem, because for example (with a QDial 100x100) :

                        • if I add text in (0,50) a part of the text will be on the QDial..
                        • if I add text in (-10,50), a part of the text will be cut

                        I guess I have to extend the painting zone.. but I don't find anything...

                        mrjjM 1 Reply Last reply
                        0
                        • PuntP Punt

                          Ok, I understand how it works.. I have an idea to determinate the position of my texts (unit cercle I guess).

                          But I have a problem, because for example (with a QDial 100x100) :

                          • if I add text in (0,50) a part of the text will be on the QDial..
                          • if I add text in (-10,50), a part of the text will be cut

                          I guess I have to extend the painting zone.. but I don't find anything...

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

                          @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 1 Reply Last reply
                          0
                          • 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
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