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QTabWidget, setting colour of tab itself ?

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  • SPlattenS SPlatten

    @JoeCFD , unfortunately its completely out of my control and the company using it won't be updating it anytime soon as there are other dependencies / reasons why they can't.

    JoeCFDJ Offline
    JoeCFDJ Offline
    JoeCFD
    wrote on last edited by
    #48

    @SPlatten You may push them for an update and get more contracts.

    SPlattenS 1 Reply Last reply
    0
    • JoeCFDJ JoeCFD

      @SPlatten You may push them for an update and get more contracts.

      SPlattenS Offline
      SPlattenS Offline
      SPlatten
      wrote on last edited by
      #49

      @JoeCFD , the company is a world wide provider of defence and weapon tech....they're clients are governments and the equipment is years out of date, again, I have requested an updated, but I can't do anything about it.

      Kind Regards,
      Sy

      JonBJ 1 Reply Last reply
      0
      • JoeCFDJ Offline
        JoeCFDJ Offline
        JoeCFD
        wrote on last edited by JoeCFD
        #50
        1. 4.8 qtabbar_cpp source code is here. copy line 1569 to 1648 to your paint event. Not sure if this will work.
          https://dreamswork.github.io/qt4/qtabbar_8cpp_source.html
          painting of tabs is done at line 1622.
        2. Look at lines 1594 and 1595. These lines call initStyleOption() to create QStyleOptionTabV3 tab for each tab which is a subclass of QStyleOption
          https://dreamswork.github.io/qt4/classQTabBar.html#a41b394d892263b6b5a0705fb979f3c8e
          and each QStyleOption has a public palette with background color. You can change it. Try to print out the background color to see what it is.
        3. you can find QStyleOptionTabV3 and QStyleOptionTab here
          https://dreamswork.github.io/qt4/qstyleoption_8h_source.html
          This way may be simpler. Good luck.
        SPlattenS 3 Replies Last reply
        0
        • SPlattenS SPlatten

          @JoeCFD , the company is a world wide provider of defence and weapon tech....they're clients are governments and the equipment is years out of date, again, I have requested an updated, but I can't do anything about it.

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #51

          @SPlatten
          Without wanting to digress this thread. I am surprised given the age of an old 4.8 implementation they now insist they want a change in a tab colour! Can't you say "Sorry, I have looked into it, this old version won't let me do that" ?

          SPlattenS 1 Reply Last reply
          0
          • JoeCFDJ JoeCFD
            1. 4.8 qtabbar_cpp source code is here. copy line 1569 to 1648 to your paint event. Not sure if this will work.
              https://dreamswork.github.io/qt4/qtabbar_8cpp_source.html
              painting of tabs is done at line 1622.
            2. Look at lines 1594 and 1595. These lines call initStyleOption() to create QStyleOptionTabV3 tab for each tab which is a subclass of QStyleOption
              https://dreamswork.github.io/qt4/classQTabBar.html#a41b394d892263b6b5a0705fb979f3c8e
              and each QStyleOption has a public palette with background color. You can change it. Try to print out the background color to see what it is.
            3. you can find QStyleOptionTabV3 and QStyleOptionTab here
              https://dreamswork.github.io/qt4/qstyleoption_8h_source.html
              This way may be simpler. Good luck.
            SPlattenS Offline
            SPlattenS Offline
            SPlatten
            wrote on last edited by
            #52

            @JoeCFD , unfortunately the company firewall will not allow access to the dreamswork domain.

            Kind Regards,
            Sy

            1 Reply Last reply
            0
            • JonBJ JonB

              @SPlatten
              Without wanting to digress this thread. I am surprised given the age of an old 4.8 implementation they now insist they want a change in a tab colour! Can't you say "Sorry, I have looked into it, this old version won't let me do that" ?

              SPlattenS Offline
              SPlattenS Offline
              SPlatten
              wrote on last edited by
              #53

              @JonB , I was brought into this company 5 months ago and the project is very old, there is a lot of issues to resolve and this is just one of many.

              Kind Regards,
              Sy

              1 Reply Last reply
              0
              • SPlattenS Offline
                SPlattenS Offline
                SPlatten
                wrote on last edited by
                #54

                @J.Hilk, @JonB , @JoeCFD, I tried another tack...that is calling tabButton of QTabBar to get the tab widget, I was then going to try setting the widget style sheet, however failed at the first hurdle:

                int intTabs(count()); //This returns 10, which is the number of tabs
                for( int intTab=0; intTab<intTabs; intTab++ ) {
                    QString strText(tabText(intTab));  //This works and gets the tab text, e.g. &Overall
                    QWidget* pobjTab(tabButton(intTab, QTabBar::LeftSide));
                    if ( !pobjTab ) {
                        pobjTab = tabButton(intTab, QTabBar::RightSide);
                    }
                }
                

                Calling tabButton with QTabBar::LeftSide or QTabBar::RightSide returns NULL. Have I done something wrong or is this something else that doesn't work in 4.8 ?

                Kind Regards,
                Sy

                JonBJ 1 Reply Last reply
                0
                • JoeCFDJ JoeCFD
                  1. 4.8 qtabbar_cpp source code is here. copy line 1569 to 1648 to your paint event. Not sure if this will work.
                    https://dreamswork.github.io/qt4/qtabbar_8cpp_source.html
                    painting of tabs is done at line 1622.
                  2. Look at lines 1594 and 1595. These lines call initStyleOption() to create QStyleOptionTabV3 tab for each tab which is a subclass of QStyleOption
                    https://dreamswork.github.io/qt4/classQTabBar.html#a41b394d892263b6b5a0705fb979f3c8e
                    and each QStyleOption has a public palette with background color. You can change it. Try to print out the background color to see what it is.
                  3. you can find QStyleOptionTabV3 and QStyleOptionTab here
                    https://dreamswork.github.io/qt4/qstyleoption_8h_source.html
                    This way may be simpler. Good luck.
                  SPlattenS Offline
                  SPlattenS Offline
                  SPlatten
                  wrote on last edited by SPlatten
                  #55

                  @JoeCFD , just tried to access:
                  https://dreamworks.github.io/qt4/qtabbar_8cpp_source.html

                  on my iPhone and get 404, sorry must be my fat fingers, closed browser and tried again this time ok.

                  Kind Regards,
                  Sy

                  1 Reply Last reply
                  0
                  • SPlattenS SPlatten

                    @J.Hilk, @JonB , @JoeCFD, I tried another tack...that is calling tabButton of QTabBar to get the tab widget, I was then going to try setting the widget style sheet, however failed at the first hurdle:

                    int intTabs(count()); //This returns 10, which is the number of tabs
                    for( int intTab=0; intTab<intTabs; intTab++ ) {
                        QString strText(tabText(intTab));  //This works and gets the tab text, e.g. &Overall
                        QWidget* pobjTab(tabButton(intTab, QTabBar::LeftSide));
                        if ( !pobjTab ) {
                            pobjTab = tabButton(intTab, QTabBar::RightSide);
                        }
                    }
                    

                    Calling tabButton with QTabBar::LeftSide or QTabBar::RightSide returns NULL. Have I done something wrong or is this something else that doesn't work in 4.8 ?

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by
                    #56

                    @SPlatten said in QTabWidget, setting colour of tab itself ?:

                    Calling tabButton with QTabBar::LeftSide or QTabBar::RightSide returns NULL. Have I done something wrong or is this something else that doesn't work in 4.8 ?

                    I believe either (a) the QTabBar does not have any QWidgets on/for its tabs at the time you call this or (b) it never has any QWidget on/for its tabs unless you call QTabBar::setTabButton(int index, QTabBar::ButtonPosition position, QWidget *widget).

                    SPlattenS 1 Reply Last reply
                    0
                    • JoeCFDJ JoeCFD
                      1. 4.8 qtabbar_cpp source code is here. copy line 1569 to 1648 to your paint event. Not sure if this will work.
                        https://dreamswork.github.io/qt4/qtabbar_8cpp_source.html
                        painting of tabs is done at line 1622.
                      2. Look at lines 1594 and 1595. These lines call initStyleOption() to create QStyleOptionTabV3 tab for each tab which is a subclass of QStyleOption
                        https://dreamswork.github.io/qt4/classQTabBar.html#a41b394d892263b6b5a0705fb979f3c8e
                        and each QStyleOption has a public palette with background color. You can change it. Try to print out the background color to see what it is.
                      3. you can find QStyleOptionTabV3 and QStyleOptionTab here
                        https://dreamswork.github.io/qt4/qstyleoption_8h_source.html
                        This way may be simpler. Good luck.
                      SPlattenS Offline
                      SPlattenS Offline
                      SPlatten
                      wrote on last edited by
                      #57

                      @JoeCFD , QStyleOptionTabV2 and QStyleOptionTabV3 are according to official documentation obsolete and replaced with QStyleOptionTab.

                      Kind Regards,
                      Sy

                      JoeCFDJ 1 Reply Last reply
                      0
                      • JonBJ JonB

                        @SPlatten said in QTabWidget, setting colour of tab itself ?:

                        Calling tabButton with QTabBar::LeftSide or QTabBar::RightSide returns NULL. Have I done something wrong or is this something else that doesn't work in 4.8 ?

                        I believe either (a) the QTabBar does not have any QWidgets on/for its tabs at the time you call this or (b) it never has any QWidget on/for its tabs unless you call QTabBar::setTabButton(int index, QTabBar::ButtonPosition position, QWidget *widget).

                        SPlattenS Offline
                        SPlattenS Offline
                        SPlatten
                        wrote on last edited by
                        #58

                        @JonB , (b) is the case, I was hoping that each button on the tab bar was a widget available via this call.

                        Kind Regards,
                        Sy

                        JonBJ 1 Reply Last reply
                        0
                        • SPlattenS SPlatten

                          @JonB , (b) is the case, I was hoping that each button on the tab bar was a widget available via this call.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #59

                          @SPlatten
                          I think/suspect not. By default it does not use/place any QWidget on/for the tabs, rather something internal (just the text on the tab, no special widget).

                          Mind you, if it helps your case (I don't know if it does) you could explicitly use QTabBar::setTabButton() to put your own widget there, then you can access that widget. I don't know whether that would aid you in your issue.

                          You were referred to https://stackoverflow.com/questions/46137500/qt-tabwidget-each-tab-title-background-color. There in answer https://stackoverflow.com/a/46139321/489865 you are shown a picture with the tabs having their own (different) colors. Could you state clearly and unequivocally whether (a) this is what you want and (b) (if so) why you can't use that solution?

                          SPlattenS 1 Reply Last reply
                          0
                          • JonBJ JonB

                            @SPlatten
                            I think/suspect not. By default it does not use/place any QWidget on/for the tabs, rather something internal (just the text on the tab, no special widget).

                            Mind you, if it helps your case (I don't know if it does) you could explicitly use QTabBar::setTabButton() to put your own widget there, then you can access that widget. I don't know whether that would aid you in your issue.

                            You were referred to https://stackoverflow.com/questions/46137500/qt-tabwidget-each-tab-title-background-color. There in answer https://stackoverflow.com/a/46139321/489865 you are shown a picture with the tabs having their own (different) colors. Could you state clearly and unequivocally whether (a) this is what you want and (b) (if so) why you can't use that solution?

                            SPlattenS Offline
                            SPlattenS Offline
                            SPlatten
                            wrote on last edited by
                            #60

                            @JonB , in my code I am now writing the geometry of each tab when each is selected to the log file and I can see the geometry is correct , I can also see that the selection of the correct colour is chosen, but is this code correct:

                            opt.palette.setColor(QPalette::Button, QColor(kErrorColour));
                            

                            opt is obtained from a call to:

                            initStyleOption(&opt, intTab);
                            

                            Where intTab is 0 to N and opt is defined as QStyleOptionTab.

                            Kind Regards,
                            Sy

                            JonBJ 1 Reply Last reply
                            0
                            • SPlattenS SPlatten

                              @JonB , in my code I am now writing the geometry of each tab when each is selected to the log file and I can see the geometry is correct , I can also see that the selection of the correct colour is chosen, but is this code correct:

                              opt.palette.setColor(QPalette::Button, QColor(kErrorColour));
                              

                              opt is obtained from a call to:

                              initStyleOption(&opt, intTab);
                              

                              Where intTab is 0 to N and opt is defined as QStyleOptionTab.

                              JonBJ Offline
                              JonBJ Offline
                              JonB
                              wrote on last edited by
                              #61

                              @SPlatten
                              Does not seem unreasonable. Would not work if (a) kErrorColour's value is not acceptable to QColor or (b) you are using a stylesheet on the element, as stylesheets override palette changes.

                              Have you first tried the code shown in that SO solution? Does that work for you as they show? Then you can fiddle with changing that to whatever it is you want till it works or goes wrong.

                              SPlattenS JonBJ 2 Replies Last reply
                              0
                              • JonBJ JonB

                                @SPlatten
                                Does not seem unreasonable. Would not work if (a) kErrorColour's value is not acceptable to QColor or (b) you are using a stylesheet on the element, as stylesheets override palette changes.

                                Have you first tried the code shown in that SO solution? Does that work for you as they show? Then you can fiddle with changing that to whatever it is you want till it works or goes wrong.

                                SPlattenS Offline
                                SPlattenS Offline
                                SPlatten
                                wrote on last edited by
                                #62

                                @JonB , kErrorColour:

                                const char_t kErrorColour[] = "red";
                                

                                Kind Regards,
                                Sy

                                1 Reply Last reply
                                0
                                • JonBJ JonB

                                  @SPlatten
                                  Does not seem unreasonable. Would not work if (a) kErrorColour's value is not acceptable to QColor or (b) you are using a stylesheet on the element, as stylesheets override palette changes.

                                  Have you first tried the code shown in that SO solution? Does that work for you as they show? Then you can fiddle with changing that to whatever it is you want till it works or goes wrong.

                                  JonBJ Offline
                                  JonBJ Offline
                                  JonB
                                  wrote on last edited by
                                  #63

                                  @JonB said in QTabWidget, setting colour of tab itself ?:

                                  Have you first tried the code shown in that SO solution? Does that work for you as they show? Then you can fiddle with changing that to whatever it is you want till it works or goes wrong.

                                  SPlattenS 1 Reply Last reply
                                  0
                                  • JonBJ JonB

                                    @JonB said in QTabWidget, setting colour of tab itself ?:

                                    Have you first tried the code shown in that SO solution? Does that work for you as they show? Then you can fiddle with changing that to whatever it is you want till it works or goes wrong.

                                    SPlattenS Offline
                                    SPlattenS Offline
                                    SPlatten
                                    wrote on last edited by
                                    #64

                                    @JonB , thats the code my class is based on and no I don't have any of the tabs changing colour.

                                    Kind Regards,
                                    Sy

                                    JonBJ 1 Reply Last reply
                                    0
                                    • SPlattenS SPlatten

                                      @JonB , thats the code my class is based on and no I don't have any of the tabs changing colour.

                                      JonBJ Offline
                                      JonBJ Offline
                                      JonB
                                      wrote on last edited by
                                      #65

                                      @SPlatten said in QTabWidget, setting colour of tab itself ?:

                                      thats the code my class is based on

                                      Why won't you try their code instead of yours? How do we know whether something you have done has affected the outcome? Why do we have to guess whether that might be the case or not when you could try a solution shown to have been working? First try their exact code, then report whether it works for you or not.....

                                      SPlattenS 1 Reply Last reply
                                      0
                                      • JonBJ JonB

                                        @SPlatten said in QTabWidget, setting colour of tab itself ?:

                                        thats the code my class is based on

                                        Why won't you try their code instead of yours? How do we know whether something you have done has affected the outcome? Why do we have to guess whether that might be the case or not when you could try a solution shown to have been working? First try their exact code, then report whether it works for you or not.....

                                        SPlattenS Offline
                                        SPlattenS Offline
                                        SPlatten
                                        wrote on last edited by SPlatten
                                        #66

                                        @JonB , mainly because its a lot of backtracking and changes that to be honest its simple enough to see what this is doing and mine does almost exactly the same.

                                        What I will do instead is create a simple application using Qt Creator and 4.8 with the original code to see if that works.

                                        Kind Regards,
                                        Sy

                                        JonBJ 1 Reply Last reply
                                        0
                                        • SPlattenS SPlatten

                                          @JonB , mainly because its a lot of backtracking and changes that to be honest its simple enough to see what this is doing and mine does almost exactly the same.

                                          What I will do instead is create a simple application using Qt Creator and 4.8 with the original code to see if that works.

                                          JonBJ Offline
                                          JonBJ Offline
                                          JonB
                                          wrote on last edited by JonB
                                          #67

                                          @SPlatten said in QTabWidget, setting colour of tab itself ?:

                                          mainly because its a lot of backtracking and changes

                                          No it's not. It would take you 5 minutes to paste that code into a tiny, new, standalone program to test whether it works for you or not. You could have done it in the time it took you to answer that you didn't want to do it. You seem to spend a lot of time posting questions you want help with and pasting loads of your own code and expecting others to spend time to spot what is wrong, but are very resistant to simplifying and testing yourself. Not to mention, half the time you end up saying it was something else in your code what caused whatever problem which we have not even been shown.

                                          If you don't want to do that, best of luck getting someone to spot what might be wrong in your code. Then either:

                                          • It does work, and your "mine does almost exactly the same" is then clearly not similar enough, and you can discover why; or

                                          • It does not work at all for you, standalone, not with your own code changes. In which case I will start by asking you whether you took the time to read the Comments to the SO post, as I did, and how you respond to:

                                          Seen, It no effect in window's system...

                                          so the solution is add a.setStyle("fusion"); to main.cpp. thanks

                                          SPlattenS 1 Reply Last reply
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