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Qt Style Sheets cascading classes selectors

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  • webzoidW Offline
    webzoidW Offline
    webzoid
    wrote on last edited by
    #10

    @JNBarchan I believe the QObject::setProperty function is how you would assign a dynamic property in c++. See here

    http://doc.qt.io/qt-5/qobject.html#setProperty

    @J-Hilk I will post my worked example for download shortly...

    JonBJ 1 Reply Last reply
    1
    • webzoidW Offline
      webzoidW Offline
      webzoid
      wrote on last edited by webzoid
      #11

      Here's a QWidgets example:

      https://drive.google.com/open?id=1XbOJgF6DNqsmq_JR5c9gfWiHv3poHPWV

      The "style.css" file needs to live alongside the executable in order for this to work. Or change the code...

      1 Reply Last reply
      2
      • webzoidW webzoid

        @JNBarchan I believe the QObject::setProperty function is how you would assign a dynamic property in c++. See here

        http://doc.qt.io/qt-5/qobject.html#setProperty

        @J-Hilk I will post my worked example for download shortly...

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #12

        @webzoid said in Qt Style Sheets cascading classes selectors:

        @JNBarchan I believe the QObject::setProperty function is how you would assign a dynamic property in c++. See here

        http://doc.qt.io/qt-5/qobject.html#setProperty

        Hopefully, you are a hero(!), though not time to try it right now.

        From the docs I note:

        If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

        Being Python/PyQt, I don't know how (or even if it's possible) to do Q_PROPERTY. Assuming I can't, does your class property principle work OK if that is absent?

        webzoidW J.HilkJ 2 Replies Last reply
        0
        • JonBJ JonB

          @webzoid said in Qt Style Sheets cascading classes selectors:

          @JNBarchan I believe the QObject::setProperty function is how you would assign a dynamic property in c++. See here

          http://doc.qt.io/qt-5/qobject.html#setProperty

          Hopefully, you are a hero(!), though not time to try it right now.

          From the docs I note:

          If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

          Being Python/PyQt, I don't know how (or even if it's possible) to do Q_PROPERTY. Assuming I can't, does your class property principle work OK if that is absent?

          webzoidW Offline
          webzoidW Offline
          webzoid
          wrote on last edited by
          #13

          @JNBarchan Unfortunately I'm coming from the Windows QWidget application side of things so I really can't comment on what Python/PyQt will do in this instance.

          I have just done a test whereby I call the setProperty function from C++ as follows:

          ui->pushButton->setProperty("class", "red thick-border");
          

          and the result is exactly the same as if I'd done it in the designer. Hopefully PyQt works in the same way.

          JonBJ 1 Reply Last reply
          1
          • JonBJ JonB

            @webzoid said in Qt Style Sheets cascading classes selectors:

            @JNBarchan I believe the QObject::setProperty function is how you would assign a dynamic property in c++. See here

            http://doc.qt.io/qt-5/qobject.html#setProperty

            Hopefully, you are a hero(!), though not time to try it right now.

            From the docs I note:

            If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

            Being Python/PyQt, I don't know how (or even if it's possible) to do Q_PROPERTY. Assuming I can't, does your class property principle work OK if that is absent?

            J.HilkJ Offline
            J.HilkJ Offline
            J.Hilk
            Moderators
            wrote on last edited by
            #14

            @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

            @webzoid thank you very much! That will help a lot of people for a long time ;-)


            Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


            Q: What's that?
            A: It's blue light.
            Q: What does it do?
            A: It turns blue.

            webzoidW JonBJ 2 Replies Last reply
            0
            • J.HilkJ J.Hilk

              @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

              @webzoid thank you very much! That will help a lot of people for a long time ;-)

              webzoidW Offline
              webzoidW Offline
              webzoid
              wrote on last edited by
              #15

              @J.Hilk It's definitely helped me already!

              1 Reply Last reply
              0
              • webzoidW webzoid

                @JNBarchan Unfortunately I'm coming from the Windows QWidget application side of things so I really can't comment on what Python/PyQt will do in this instance.

                I have just done a test whereby I call the setProperty function from C++ as follows:

                ui->pushButton->setProperty("class", "red thick-border");
                

                and the result is exactly the same as if I'd done it in the designer. Hopefully PyQt works in the same way.

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #16

                @webzoid

                @JNBarchan Unfortunately I'm coming from the Windows QWidget application side of things so I really can't comment on what Python/PyQt will do in this instance.

                No, we're on the same page there. I inherit from QWidget OK just like you do. But (I believe) you can do something like:

                class MyWidget : QWidget
                {
                    Q_PROPERTY QString cssClass;  // declare cssClass member as a known property in MyWidget
                    ...
                    this.cssClass = "red blue";
                }
                

                I can't (don't know how to/if I can) use that Q_PROPERTY macro you have, so just:

                class MyWidget(QWidget)
                {
                    ...
                    self.cssClass = "red blue";
                }
                

                But I think you are not using Q_PROPERTY anywhere yourself, you just go ui->pushButton->setProperty("class", "red thick-border");, so your class is:

                therefore not listed in the meta-object, it is added as a dynamic property

                Is that correct for your C++ situation? Which is all I can do, and looks same as what you are doing to me, so I should be OK?

                1 Reply Last reply
                0
                • J.HilkJ J.Hilk

                  @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

                  @webzoid thank you very much! That will help a lot of people for a long time ;-)

                  JonBJ Offline
                  JonBJ Offline
                  JonB
                  wrote on last edited by JonB
                  #17

                  @J.Hilk said in Qt Style Sheets cascading classes selectors:

                  @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

                  ? a. I think it's a macro, so what is its expansion anyway? and b. in Python we do not even declare any member variables in a class (not my fault, I didn't choose Python), so ... ?

                  J.HilkJ 1 Reply Last reply
                  0
                  • JonBJ JonB

                    @J.Hilk said in Qt Style Sheets cascading classes selectors:

                    @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

                    ? a. I think it's a macro, so what is its expansion anyway? and b. in Python we do not even declare any member variables in a class (not my fault, I didn't choose Python), so ... ?

                    J.HilkJ Offline
                    J.HilkJ Offline
                    J.Hilk
                    Moderators
                    wrote on last edited by
                    #18

                    @JNBarchan said in Qt Style Sheets cascading classes selectors:

                    @J.Hilk said in Qt Style Sheets cascading classes selectors:

                    @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

                    ? a. I think it's a macro, so what is its expansion anyway? and b. in Python we do not even declare any member variables in a class (not my fault, I didn't choose Python), so ... ?

                    Well, yes, technically its a Macro (I think), I found this webside Support for Qt Properties for PyQt5

                    seems like a good place to start, I guess.


                    Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                    Q: What's that?
                    A: It's blue light.
                    Q: What does it do?
                    A: It turns blue.

                    raven-worxR 1 Reply Last reply
                    1
                    • J.HilkJ J.Hilk

                      @JNBarchan said in Qt Style Sheets cascading classes selectors:

                      @J.Hilk said in Qt Style Sheets cascading classes selectors:

                      @JNBarchan Q_Property is part of QObject that is the essential part of what makes qt qt, so I would be seriously surpised if its not possible.

                      ? a. I think it's a macro, so what is its expansion anyway? and b. in Python we do not even declare any member variables in a class (not my fault, I didn't choose Python), so ... ?

                      Well, yes, technically its a Macro (I think), I found this webside Support for Qt Properties for PyQt5

                      seems like a good place to start, I guess.

                      raven-worxR Offline
                      raven-worxR Offline
                      raven-worx
                      Moderators
                      wrote on last edited by raven-worx
                      #19

                      @J.Hilk
                      actually this is already stated in the docs.
                      Altough i am surprised that it works when you assign a string with space-separated values instead of a QVariant containing a QStringList.

                      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                      If you have a question please use the forum so others can benefit from the solution in the future

                      JonBJ 2 Replies Last reply
                      3
                      • raven-worxR raven-worx

                        @J.Hilk
                        actually this is already stated in the docs.
                        Altough i am surprised that it works when you assign a string with space-separated values instead of a QVariant containing a QStringList.

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by
                        #20

                        @raven-worx
                        Thanks, I needed that link. I had not come across it, its discussion of setProperty(), dynamic properties, multiple properties, use of ~=, etc. Obscure (for me)!

                        I see it says:

                        In addition, the special class property is supported, for the name of the class.

                        This might explain why my attempts so far to set & match my own property named class, as per @webzoid's suggestion, has not been working...!

                        1 Reply Last reply
                        0
                        • raven-worxR raven-worx

                          @J.Hilk
                          actually this is already stated in the docs.
                          Altough i am surprised that it works when you assign a string with space-separated values instead of a QVariant containing a QStringList.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by JonB
                          #21

                          @raven-worx
                          I'm really struggling here, because what should be working just isn't. I'm not even as far as multiple property/space-separated strings, just one item:

                          1. I create a QLabel.

                          2. Stylesheet: (global, nothing else in it) QLabel { color: red; }

                          3. Change to: QLabel[cssClass="red"] { color: red; }, or to QLabel[cssClass~="red"] { color: red; }

                          4. Change code to: label.setProperty("cssClass", "red")

                          After #2 it's red. After #4 it ceases to be red :(

                          I know it's Python/PyQt --- and I can't test C++ or QML --- but I really think the setProperty() will be a straight, pass-through call.

                          Would someone be prepared to just try as simple as above?

                          raven-worxR 1 Reply Last reply
                          0
                          • JonBJ JonB

                            @raven-worx
                            I'm really struggling here, because what should be working just isn't. I'm not even as far as multiple property/space-separated strings, just one item:

                            1. I create a QLabel.

                            2. Stylesheet: (global, nothing else in it) QLabel { color: red; }

                            3. Change to: QLabel[cssClass="red"] { color: red; }, or to QLabel[cssClass~="red"] { color: red; }

                            4. Change code to: label.setProperty("cssClass", "red")

                            After #2 it's red. After #4 it ceases to be red :(

                            I know it's Python/PyQt --- and I can't test C++ or QML --- but I really think the setProperty() will be a straight, pass-through call.

                            Would someone be prepared to just try as simple as above?

                            raven-worxR Offline
                            raven-worxR Offline
                            raven-worx
                            Moderators
                            wrote on last edited by
                            #22

                            @JNBarchan
                            i never used PyQt in my life, so i have absolutely no experience with it.

                            Do you mean you change the stylesheet at runtime? Or do you just want to specify the stylesheet once from application startup and never change it again?

                            In c++ i would do this:

                            QLabel* label = new QLabel;
                                label->setProperty("cssClass", QVariant::fromValue<QStringList>( QStringList() << "red" ) );
                            

                            and in the stylesheet:

                            QLabel[cssClass~="red"] { color: red; }
                            

                            I don't what the equivalent of a QStringList in PyQt.

                            --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                            If you have a question please use the forum so others can benefit from the solution in the future

                            JonBJ 1 Reply Last reply
                            1
                            • raven-worxR raven-worx

                              @JNBarchan
                              i never used PyQt in my life, so i have absolutely no experience with it.

                              Do you mean you change the stylesheet at runtime? Or do you just want to specify the stylesheet once from application startup and never change it again?

                              In c++ i would do this:

                              QLabel* label = new QLabel;
                                  label->setProperty("cssClass", QVariant::fromValue<QStringList>( QStringList() << "red" ) );
                              

                              and in the stylesheet:

                              QLabel[cssClass~="red"] { color: red; }
                              

                              I don't what the equivalent of a QStringList in PyQt.

                              JonBJ Offline
                              JonBJ Offline
                              JonB
                              wrote on last edited by JonB
                              #23

                              @raven-worx

                              No, no need to change at runtime, all from startup.

                              I assume what you have written actually does work for you?

                              In Python (PyQt), we can't have QString, or QStringList, or QVariant :( (Don't ask, that's how it is...) PyQt's declaration of setProperty() is that it accepts Any, which means you pass any type from the language....

                              Please, keeping it simple, no lists, would yours still work if you wrote:

                              label->setProperty("cssClass", "red" );

                              Or, if that does not work, what about:

                              label->setProperty("cssClass", QVariant::fromValue<QString>( "red" ) );

                              (And we could stick to = not ~= in the stylesheet. I'm trying to do everything with just one item, no lists, to get anything working here...)

                              raven-worxR 1 Reply Last reply
                              0
                              • JonBJ JonB

                                @raven-worx

                                No, no need to change at runtime, all from startup.

                                I assume what you have written actually does work for you?

                                In Python (PyQt), we can't have QString, or QStringList, or QVariant :( (Don't ask, that's how it is...) PyQt's declaration of setProperty() is that it accepts Any, which means you pass any type from the language....

                                Please, keeping it simple, no lists, would yours still work if you wrote:

                                label->setProperty("cssClass", "red" );

                                Or, if that does not work, what about:

                                label->setProperty("cssClass", QVariant::fromValue<QString>( "red" ) );

                                (And we could stick to = not ~= in the stylesheet. I'm trying to do everything with just one item, no lists, to get anything working here...)

                                raven-worxR Offline
                                raven-worxR Offline
                                raven-worx
                                Moderators
                                wrote on last edited by raven-worx
                                #24

                                @JNBarchan said in Qt Style Sheets cascading classes selectors:

                                In Python (PyQt), we can't have QString, or QStringList, or QVariant :( (Don't ask, that's how it is...)

                                This questions everything else then, if it is even possible at all.
                                I have no idea then what exactly is assigned to the property in the background.

                                Do you set the property before the widget is shown? Best would be to set the property right after instantiation.

                                --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                If you have a question please use the forum so others can benefit from the solution in the future

                                JonBJ 1 Reply Last reply
                                0
                                • raven-worxR raven-worx

                                  @JNBarchan said in Qt Style Sheets cascading classes selectors:

                                  In Python (PyQt), we can't have QString, or QStringList, or QVariant :( (Don't ask, that's how it is...)

                                  This questions everything else then, if it is even possible at all.
                                  I have no idea then what exactly is assigned to the property in the background.

                                  Do you set the property before the widget is shown? Best would be to set the property right after instantiation.

                                  JonBJ Offline
                                  JonBJ Offline
                                  JonB
                                  wrote on last edited by JonB
                                  #25

                                  @raven-worx
                                  Please don't worry about that, I will sort out the PyQt side. I have just posted above what I need to know from you for C++, please. You are being so helpful I don't want to lose you...!

                                  P.S.
                                  Yes, I set property after instantiation, before it gets shown.

                                  raven-worxR 1 Reply Last reply
                                  0
                                  • JonBJ JonB

                                    @raven-worx
                                    Please don't worry about that, I will sort out the PyQt side. I have just posted above what I need to know from you for C++, please. You are being so helpful I don't want to lose you...!

                                    P.S.
                                    Yes, I set property after instantiation, before it gets shown.

                                    raven-worxR Offline
                                    raven-worxR Offline
                                    raven-worx
                                    Moderators
                                    wrote on last edited by
                                    #26

                                    @JNBarchan
                                    for what you've posted so far the following should work (single strings in the property):

                                    Stylesheet:

                                    QLabel[cssClass="red"] { color: red; }
                                    

                                    Code:

                                    label.setProperty("cssClass", "red")
                                    

                                    --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                    If you have a question please use the forum so others can benefit from the solution in the future

                                    JonBJ 1 Reply Last reply
                                    0
                                    • raven-worxR raven-worx

                                      @JNBarchan
                                      for what you've posted so far the following should work (single strings in the property):

                                      Stylesheet:

                                      QLabel[cssClass="red"] { color: red; }
                                      

                                      Code:

                                      label.setProperty("cssClass", "red")
                                      
                                      JonBJ Offline
                                      JonBJ Offline
                                      JonB
                                      wrote on last edited by JonB
                                      #27

                                      @raven-worx
                                      I couldn't agree more that it should work, but that's what I claim to have in PyQt, and it does not :(

                                      I just put in, and checked in debugger:

                                      result = label.setProperty("cssclass", "red")
                                      

                                      and result is getting set to false. This corresponds correctly to:

                                      If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

                                      Then added immediately afterward:

                                      q = self.label.property("cssclass")

                                      and sure enough that is returning "red".

                                      So it looks to me that the property is getting set correctly...... It's the selector that doesn't seem to be matching, and I have tried using either = or ~=... And remember that QLabel { color: red; } does match...

                                      EDIT: And for an in-built property it does work correctly, e.g. QLabel[class="QLabel"] does match and QLabel[class="rubbish"] does not match. But not for a dynamic property I'm adding.

                                      You wrote:

                                      the following should work

                                      Very, very politely, have you actually verified that your code works?

                                      I confirm that I am finding: everything works fine when I use "inbuilt"/"known" properties (e.g. class, flat, etc.), but nothing works when I use use "dynamic" properties created on the fly via setProperty() (the property seems to get set OK on the QObject, but it's never matched by the selector). Anyone?

                                      UPDATE: OK, I'm starting from scratch in a minimal app, and it is working via setProperty(). Which is good :) So now, obviously, I'll report back after I've spent a few hundred hours finding out what's any different in my proper app... ;-)

                                      UPDATE2: I've now sorted out what was different in the app. (I'm sorry --- it's 32K-odd lines, I didn't write it, I don't know my way around all of it. I thought I knew what I was affecting with my test changes, I was affecting the wrong things.)

                                      The good news it's all working OK now, with setProperty()! Nothing special about Python/PyQt.

                                      I can even use multiple values for my properties, and the ~= selector matcher, and everything is as I need it to be. So you can build up your desired attributes (color, size, font, whatever) into loads of different rules in the CSS and combine them as you please on any widget :)

                                      @raven-worx
                                      You wrote:

                                      Altough i am surprised that it works when you assign a string with space-separated values instead of a QVariant containing a QStringList.

                                      Actually, it does seem to work quite happily as a space-separated string like "tall red rounded", treating each "word" as though it had been an element in the QStringList I guess. CSS/HTML/JavaScript works this way too with a space-separated list of class names.

                                      Thanks so much for your help & patience. And everyone else.

                                      raven-worxR 1 Reply Last reply
                                      0
                                      • JonBJ JonB

                                        @raven-worx
                                        I couldn't agree more that it should work, but that's what I claim to have in PyQt, and it does not :(

                                        I just put in, and checked in debugger:

                                        result = label.setProperty("cssclass", "red")
                                        

                                        and result is getting set to false. This corresponds correctly to:

                                        If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

                                        Then added immediately afterward:

                                        q = self.label.property("cssclass")

                                        and sure enough that is returning "red".

                                        So it looks to me that the property is getting set correctly...... It's the selector that doesn't seem to be matching, and I have tried using either = or ~=... And remember that QLabel { color: red; } does match...

                                        EDIT: And for an in-built property it does work correctly, e.g. QLabel[class="QLabel"] does match and QLabel[class="rubbish"] does not match. But not for a dynamic property I'm adding.

                                        You wrote:

                                        the following should work

                                        Very, very politely, have you actually verified that your code works?

                                        I confirm that I am finding: everything works fine when I use "inbuilt"/"known" properties (e.g. class, flat, etc.), but nothing works when I use use "dynamic" properties created on the fly via setProperty() (the property seems to get set OK on the QObject, but it's never matched by the selector). Anyone?

                                        UPDATE: OK, I'm starting from scratch in a minimal app, and it is working via setProperty(). Which is good :) So now, obviously, I'll report back after I've spent a few hundred hours finding out what's any different in my proper app... ;-)

                                        UPDATE2: I've now sorted out what was different in the app. (I'm sorry --- it's 32K-odd lines, I didn't write it, I don't know my way around all of it. I thought I knew what I was affecting with my test changes, I was affecting the wrong things.)

                                        The good news it's all working OK now, with setProperty()! Nothing special about Python/PyQt.

                                        I can even use multiple values for my properties, and the ~= selector matcher, and everything is as I need it to be. So you can build up your desired attributes (color, size, font, whatever) into loads of different rules in the CSS and combine them as you please on any widget :)

                                        @raven-worx
                                        You wrote:

                                        Altough i am surprised that it works when you assign a string with space-separated values instead of a QVariant containing a QStringList.

                                        Actually, it does seem to work quite happily as a space-separated string like "tall red rounded", treating each "word" as though it had been an element in the QStringList I guess. CSS/HTML/JavaScript works this way too with a space-separated list of class names.

                                        Thanks so much for your help & patience. And everyone else.

                                        raven-worxR Offline
                                        raven-worxR Offline
                                        raven-worx
                                        Moderators
                                        wrote on last edited by
                                        #28

                                        @JNBarchan said in Qt Style Sheets cascading classes selectors:

                                        Actually, it does seem to work quite happily as a space-separated string like "tall red rounded", treating each "word" as though it had been an element in the QStringList I guess. CSS/HTML/JavaScript works this way too with a space-separated list of class names.

                                        yes CSS does work this way. But Qt stylesheets (QSS) just have taken over the basic syntax of CSS2. Everything behind it is completely unrelated to CSS.

                                        Glad you figured out your issue.

                                        --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                        If you have a question please use the forum so others can benefit from the solution in the future

                                        1 Reply Last reply
                                        0
                                        • JonBJ Offline
                                          JonBJ Offline
                                          JonB
                                          wrote on last edited by JonB
                                          #29

                                          To summarise for anyone reading this. Thanks to the answers above.

                                          • You can assign a dynamic property, with a name and value of your choice, via QWidget.setProperty("cssClass", "large").

                                          • The stylesheet can match this via selector *[cssClass="large"] { ... }.

                                          • You can assign multiple values to the property via QWidget.setProperty("cssClass", [ "bold", "large", "rounded" ]). (Or it accepts a space-separated string via "bold large rounded".)

                                          • The stylesheet can match one of the values via selector *[cssClass~="large"] { ... } (note the ~=).

                                          Note that property named class is a special one, referring to the Python/C++ code class of the widget, which you probably should not assign to.

                                          1 Reply Last reply
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