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  4. Signal/Slots doesn't work with QSlider and QDoubleSpinBox

Signal/Slots doesn't work with QSlider and QDoubleSpinBox

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  • M mrjj
    16 May 2016, 16:57

    @HenrikSt. said:
    hi
    does connect(sliderHeight,xxx
    return true
    is the slot setValue called?

    U must define better "doesn't work" :)

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    A Former User
    wrote on 16 May 2016, 17:04 last edited by
    #3

    @mrjj
    QObject::connect: No such slot ResizeImageDialog::hightChanged(double) in ..\TextPad\PagesTextEdit.h:167
    QObject::connect: Incompatible sender/receiver arguments
    QSlider::valueChanged(int) --> QDoubleSpinBox::setValue(double)
    yes: false

    M 1 Reply Last reply 16 May 2016, 17:05
    0
    • ? A Former User
      16 May 2016, 17:04

      @mrjj
      QObject::connect: No such slot ResizeImageDialog::hightChanged(double) in ..\TextPad\PagesTextEdit.h:167
      QObject::connect: Incompatible sender/receiver arguments
      QSlider::valueChanged(int) --> QDoubleSpinBox::setValue(double)
      yes: false

      M Offline
      M Offline
      mrjj
      Lifetime Qt Champion
      wrote on 16 May 2016, 17:05 last edited by
      #4

      @HenrikSt.
      So what ever you are trying to connect, its not correct.

      " Incompatible sender/receiver arguments"

      I think it means
      valueChanged(int) <<< INT to setValue(double)) << double

      change setValue to int

      ? 1 Reply Last reply 16 May 2016, 17:07
      1
      • M mrjj
        16 May 2016, 17:05

        @HenrikSt.
        So what ever you are trying to connect, its not correct.

        " Incompatible sender/receiver arguments"

        I think it means
        valueChanged(int) <<< INT to setValue(double)) << double

        change setValue to int

        ? Offline
        ? Offline
        A Former User
        wrote on 16 May 2016, 17:07 last edited by
        #5

        @mrjj
        QObject::connect: No such slot ResizeImageDialog::hightChanged(double) in ..\TextPad\PagesTextEdit.h:167
        QObject::connect: No such slot QDoubleSpinBox::setValue(int) in ..\TextPad\PagesTextEdit.h:168
        yes: false

        M 1 Reply Last reply 16 May 2016, 17:08
        0
        • ? A Former User
          16 May 2016, 17:07

          @mrjj
          QObject::connect: No such slot ResizeImageDialog::hightChanged(double) in ..\TextPad\PagesTextEdit.h:167
          QObject::connect: No such slot QDoubleSpinBox::setValue(int) in ..\TextPad\PagesTextEdit.h:168
          yes: false

          M Offline
          M Offline
          mrjj
          Lifetime Qt Champion
          wrote on 16 May 2016, 17:08 last edited by
          #6

          @HenrikSt.
          Says it cant see the slot function
          ResizeImageDialog::hightChanged

          check spelling etc.

          ? 1 Reply Last reply 16 May 2016, 17:10
          0
          • M mrjj
            16 May 2016, 17:08

            @HenrikSt.
            Says it cant see the slot function
            ResizeImageDialog::hightChanged

            check spelling etc.

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            A Former User
            wrote on 16 May 2016, 17:10 last edited by
            #7

            @mrjj
            hightChanged is not important.

            The Code under that -> QDoubleSpinBox::setValue(int)

            M 1 Reply Last reply 16 May 2016, 17:15
            0
            • ? A Former User
              16 May 2016, 17:10

              @mrjj
              hightChanged is not important.

              The Code under that -> QDoubleSpinBox::setValue(int)

              M Offline
              M Offline
              mrjj
              Lifetime Qt Champion
              wrote on 16 May 2016, 17:15 last edited by
              #8

              @HenrikSt.
              well check spelling and parameters.

              ? 2 Replies Last reply 16 May 2016, 18:36
              0
              • M mrjj
                16 May 2016, 17:15

                @HenrikSt.
                well check spelling and parameters.

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                A Former User
                wrote on 16 May 2016, 18:36 last edited by
                #9

                @mrjj
                From valueChanged and setValue?

                1 Reply Last reply
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                • M mrjj
                  16 May 2016, 17:15

                  @HenrikSt.
                  well check spelling and parameters.

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                  A Former User
                  wrote on 16 May 2016, 18:47 last edited by
                  #10

                  @mrjj
                  But the spelling is correct...

                  Should i paste the all files in Project or a link to them?

                  1 Reply Last reply
                  0
                  • M Offline
                    M Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on 16 May 2016, 19:50 last edited by
                    #11

                    which objects are you trying to bind ?
                    show your connect statement after the change to int.

                    1 Reply Last reply
                    0
                    • S Offline
                      S Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on 16 May 2016, 21:41 last edited by
                      #12

                      Hi,

                      QDoubleSpinBox has no such slot, only setValue(double). Use the new Qt 5 notation for your connection, that will solve your problem.

                      i.e.

                      connect(sliderHeight, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
                      

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                      ? 1 Reply Last reply 17 May 2016, 08:48
                      2
                      • J Offline
                        J Offline
                        JKSH
                        Moderators
                        wrote on 17 May 2016, 05:12 last edited by
                        #13

                        See http://doc.qt.io/qt-5/signalsandslots-syntaxes.html#type-checking-and-implicit-type-conversions -- it uses exactly QSlider and QDoubleSpinBox in an example, and explains why it "doesn't work" with the old connection style.

                        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                        1 Reply Last reply
                        3
                        • S SGaist
                          16 May 2016, 21:41

                          Hi,

                          QDoubleSpinBox has no such slot, only setValue(double). Use the new Qt 5 notation for your connection, that will solve your problem.

                          i.e.

                          connect(sliderHeight, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
                          
                          ? Offline
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                          A Former User
                          wrote on 17 May 2016, 08:48 last edited by
                          #14

                          @SGaist
                          Thank you, it works!

                          But how can do that:

                          I have a chackbox. If the Checkbox is checked, the two spinboxes are Ratio. If i changed one slider, the other slider changed too. They both are Ratio to each other.

                          Do you understand?

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                          0
                          • J Online
                            J Online
                            jsulm
                            Lifetime Qt Champion
                            wrote on 17 May 2016, 10:13 last edited by
                            #15

                            Not really. Should both QDoubleSpinbox have the same value if that checkbox is checked?

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

                            ? 1 Reply Last reply 17 May 2016, 11:44
                            0
                            • J jsulm
                              17 May 2016, 10:13

                              Not really. Should both QDoubleSpinbox have the same value if that checkbox is checked?

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                              A Former User
                              wrote on 17 May 2016, 11:44 last edited by
                              #16

                              @jsulm
                              They should have the value when:

                              1. The Checkbox is checked and
                              2. one slider is dragged. So than both checkboxes have the value from slider

                              U understand?

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                              • J Online
                                J Online
                                jsulm
                                Lifetime Qt Champion
                                wrote on 17 May 2016, 11:53 last edited by
                                #17

                                Unfortunately not:
                                First version: "I have a chackbox. If the Checkbox is checked, the two spinboxes are Ratio. If i changed one slider, the other slider changed too. They both are Ratio to each other."

                                Second version: "
                                The Checkbox is checked and
                                one slider is dragged. So than both checkboxes have the value from slider"

                                In the first version you are talking about two spinboxes in the second version you are talking about two checkboxes. Sorry, but I'm lost...
                                And you did not answer my question whether both spinboxes (I assume you really mean spinboxes) should have the same value if one of them is changed while checkbox is checked.

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

                                ? 1 Reply Last reply 17 May 2016, 11:55
                                0
                                • J jsulm
                                  17 May 2016, 11:53

                                  Unfortunately not:
                                  First version: "I have a chackbox. If the Checkbox is checked, the two spinboxes are Ratio. If i changed one slider, the other slider changed too. They both are Ratio to each other."

                                  Second version: "
                                  The Checkbox is checked and
                                  one slider is dragged. So than both checkboxes have the value from slider"

                                  In the first version you are talking about two spinboxes in the second version you are talking about two checkboxes. Sorry, but I'm lost...
                                  And you did not answer my question whether both spinboxes (I assume you really mean spinboxes) should have the same value if one of them is changed while checkbox is checked.

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                                  A Former User
                                  wrote on 17 May 2016, 11:55 last edited by
                                  #18

                                  @jsulm
                                  Yes, sorry. I mean SpinBoxes...

                                  Your Question:

                                  Yes, both should have the same value when the ceckbox is checked:

                                     if (m_keepRatioCheckBox->isChecked())
                                     {
                                        connect(sliderHeight, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
                                        connect(sliderHeight, &QSlider::valueChanged, m_widthSpinBox, &QDoubleSpinBox::setValue);
                                        connect(sliderWidth, &QSlider::valueChanged, m_hightSpinBox, &QDoubleSpinBox::setValue);
                                        connect(sliderWidth, &QSlider::valueChanged, m_widthSpinBox, &QDoubleSpinBox::setValue);
                                     }
                                  

                                  This won't work..

                                  1 Reply Last reply
                                  0
                                  • J Online
                                    J Online
                                    jsulm
                                    Lifetime Qt Champion
                                    wrote on 17 May 2016, 12:01 last edited by
                                    #19

                                    What you could do: if, for example, sliderHeight is changed you do not set m_widthSpinBox directly, but instead you calculate the difference between m_hightSpinBox and its new value and add this difference (which can be negative) to m_widthSpinBox.
                                    You will need your own slots for that.

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

                                    ? 1 Reply Last reply 17 May 2016, 12:02
                                    0
                                    • J jsulm
                                      17 May 2016, 12:01

                                      What you could do: if, for example, sliderHeight is changed you do not set m_widthSpinBox directly, but instead you calculate the difference between m_hightSpinBox and its new value and add this difference (which can be negative) to m_widthSpinBox.
                                      You will need your own slots for that.

                                      ? Offline
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                                      A Former User
                                      wrote on 17 May 2016, 12:02 last edited by
                                      #20

                                      @jsulm
                                      Can you make/Show an example, please?

                                      1 Reply Last reply
                                      0
                                      • J Online
                                        J Online
                                        jsulm
                                        Lifetime Qt Champion
                                        wrote on 17 May 2016, 12:09 last edited by
                                        #21

                                        I did not test this code:

                                        void MyClass::sliderHeightChanged(int value)
                                        {
                                            double diff = m_heightSpinBox->value - value;
                                            m_heightSpinBox->setValue(value);
                                            m_widthSpinBox->setValue(m_widthSpinBox->value + diff);
                                        }
                                        
                                        void MyClass::sliderWidthChanged(int value)
                                        {
                                        
                                            double diff = m_widthSpinBox->value - value;
                                            m_widthSpinBox->setValue(value);
                                            m_HeightSpinBox->setValue(m_heightSpinBox->value + diff);
                                        }
                                        
                                        if (m_keepRatioCheckBox->isChecked())
                                        {
                                            connect(sliderHeight, &QSlider::valueChanged, this, &MyClass::sliderHeightChanged);
                                            connect(sliderWidth, &QSlider::valueChanged, this, &MyClass::sliderWidthChanged);
                                        }
                                        

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

                                        ? 3 Replies Last reply 17 May 2016, 12:54
                                        0
                                        • J jsulm
                                          17 May 2016, 12:09

                                          I did not test this code:

                                          void MyClass::sliderHeightChanged(int value)
                                          {
                                              double diff = m_heightSpinBox->value - value;
                                              m_heightSpinBox->setValue(value);
                                              m_widthSpinBox->setValue(m_widthSpinBox->value + diff);
                                          }
                                          
                                          void MyClass::sliderWidthChanged(int value)
                                          {
                                          
                                              double diff = m_widthSpinBox->value - value;
                                              m_widthSpinBox->setValue(value);
                                              m_HeightSpinBox->setValue(m_heightSpinBox->value + diff);
                                          }
                                          
                                          if (m_keepRatioCheckBox->isChecked())
                                          {
                                              connect(sliderHeight, &QSlider::valueChanged, this, &MyClass::sliderHeightChanged);
                                              connect(sliderWidth, &QSlider::valueChanged, this, &MyClass::sliderWidthChanged);
                                          }
                                          
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                                          A Former User
                                          wrote on 17 May 2016, 12:54 last edited by
                                          #22

                                          @jsulm
                                          I have written all the Code for the Dialog in a Header file..

                                          1 Reply Last reply
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