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QScrollBar vertical scrollbar set width

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  • hskoglundH hskoglund

    To hide the up/down buttons, perhaps try setting their height to 0, with two more setStyleSheet() invocations, say "QScrollBar:up-arrow { height: 0px; }" and "QScrollBar:down-arrow {height: 0px; }"

    You're sure you don't want a vertical QSlider instead? might be better suited

    SPlattenS Offline
    SPlattenS Offline
    SPlatten
    wrote on last edited by SPlatten
    #5

    @hskoglund , tried that, didn't work, also found this:
    https://stackoverflow.com/questions/49890692/how-to-remove-qscrollbar-scroll-buttons

    Tried that too, didn't work. I need a scrollbar because it needs to shot the proportion of the image on view.

    Also tried:
    https://doc.qt.io/archives/qt-4.8/stylesheet-examples.html#customizing-qscrollbar

    None of those work either, the only thing that does work is changing the width using the style. I'm using Qt 5.9.2.

    So far this is what I've tried:

    mpScrollBar->setStyleSheet("QScrollBar::vertical{width: 4px;}"
                               "QScrollBar::handle:vertical,"
                               "QScrollBar::add-line:vertical,"
                               "QScrollBar::sub-line:vertical,"
                               "QScrollBar::up-arrow:vertical,"
                               "QScrollBar::down-arrow:vertical"
                               "{height: 0px;display:none;}");
    

    Only the width is set, everything else isn't working.

    Kind Regards,
    Sy

    1 Reply Last reply
    0
    • hskoglundH Online
      hskoglundH Online
      hskoglund
      wrote on last edited by
      #6

      Hmm, if you're anyway off into setStyleSheet() land, if the only thing keeping you from using a QSlider is the proportional stuff, then you could try applying setStyleSheet() on QSlider instead, say:

      mpSlider->setStyleSheet(QString(
              ".QSlider::groove { background: transparent; height: %1px; } "
              ".QSlider::handle { height: %2px;}").arg(scrollbarHeight).arg(thumbHeight));
      

      you'll have to calculate the thumbHeight (i.e. the movable part of the slider) from the proportion of the image compared to the view, but this approach might be more fruitful :-)

      SPlattenS 3 Replies Last reply
      1
      • hskoglundH hskoglund

        Hmm, if you're anyway off into setStyleSheet() land, if the only thing keeping you from using a QSlider is the proportional stuff, then you could try applying setStyleSheet() on QSlider instead, say:

        mpSlider->setStyleSheet(QString(
                ".QSlider::groove { background: transparent; height: %1px; } "
                ".QSlider::handle { height: %2px;}").arg(scrollbarHeight).arg(thumbHeight));
        

        you'll have to calculate the thumbHeight (i.e. the movable part of the slider) from the proportion of the image compared to the view, but this approach might be more fruitful :-)

        SPlattenS Offline
        SPlattenS Offline
        SPlatten
        wrote on last edited by
        #7

        @hskoglund , thank you, I will give it a go.

        Kind Regards,
        Sy

        1 Reply Last reply
        0
        • hskoglundH hskoglund

          Hmm, if you're anyway off into setStyleSheet() land, if the only thing keeping you from using a QSlider is the proportional stuff, then you could try applying setStyleSheet() on QSlider instead, say:

          mpSlider->setStyleSheet(QString(
                  ".QSlider::groove { background: transparent; height: %1px; } "
                  ".QSlider::handle { height: %2px;}").arg(scrollbarHeight).arg(thumbHeight));
          

          you'll have to calculate the thumbHeight (i.e. the movable part of the slider) from the proportion of the image compared to the view, but this approach might be more fruitful :-)

          SPlattenS Offline
          SPlattenS Offline
          SPlatten
          wrote on last edited by SPlatten
          #8

          @hskoglund , one thing that comes to mind....the slider value is normally at the center point of the handle? Can this be offset? If the handle is adjusted to show a proportional representation then the value would have to be at the very top of the handle.

          Kind Regards,
          Sy

          1 Reply Last reply
          0
          • hskoglundH hskoglund

            Hmm, if you're anyway off into setStyleSheet() land, if the only thing keeping you from using a QSlider is the proportional stuff, then you could try applying setStyleSheet() on QSlider instead, say:

            mpSlider->setStyleSheet(QString(
                    ".QSlider::groove { background: transparent; height: %1px; } "
                    ".QSlider::handle { height: %2px;}").arg(scrollbarHeight).arg(thumbHeight));
            

            you'll have to calculate the thumbHeight (i.e. the movable part of the slider) from the proportion of the image compared to the view, but this approach might be more fruitful :-)

            SPlattenS Offline
            SPlattenS Offline
            SPlatten
            wrote on last edited by
            #9

            @hskoglund , I'm not sure this is going to work, for starters using the StyleSheet to set the handle width and height doesn't seem to work and there is the other issue where the origin / value seems to be central to the orientation of the handle.

            Kind Regards,
            Sy

            1 Reply Last reply
            0
            • hskoglundH Online
              hskoglundH Online
              hskoglund
              wrote on last edited by hskoglund
              #10

              Hi, dug up some old code that assumes you have a vertical QSlider with a height of say 400 pixels, minimum = 0, maximum = 400, singleStep = 1 and pageStep = 25:

              mpSlider->setStyleSheet(
                  "QSlider::groove { background: transparent; width: 4px; } "
                  "QSlider::handle { background: blue; border-radius: 5px; border: 1px solid gray; height:200px;}");
              

              then moving the slider will give you values between 0 and 400 :-)

              Edit:
              here's the simplified test program, create a vanilla QWidget app, in mainwindow.cpp and #include "qslider.h" and insert this code in MainWindow::MainWindow() after ui->setupUi(this):

              auto mpSlider = new QSlider(Qt::Vertical,this);
              mpSlider->setGeometry(QRect(100,100,100,400));
              mpSlider->setRange(0,400);
              mpSlider->setStyleSheet(
              "QSlider::groove { background: transparent; width: 4px; } "
              "QSlider::handle { background: blue; border-radius: 5px; border: 1px solid gray; height:200px;}");
              connect(mpSlider,&QSlider::valueChanged,[this](int value) { setWindowTitle("Slider value: " + QString::number(value));});
              

              should give you this:
              Screenshot 2021-06-21 at 11.41.07.png

              SPlattenS 2 Replies Last reply
              3
              • hskoglundH hskoglund

                Hi, dug up some old code that assumes you have a vertical QSlider with a height of say 400 pixels, minimum = 0, maximum = 400, singleStep = 1 and pageStep = 25:

                mpSlider->setStyleSheet(
                    "QSlider::groove { background: transparent; width: 4px; } "
                    "QSlider::handle { background: blue; border-radius: 5px; border: 1px solid gray; height:200px;}");
                

                then moving the slider will give you values between 0 and 400 :-)

                Edit:
                here's the simplified test program, create a vanilla QWidget app, in mainwindow.cpp and #include "qslider.h" and insert this code in MainWindow::MainWindow() after ui->setupUi(this):

                auto mpSlider = new QSlider(Qt::Vertical,this);
                mpSlider->setGeometry(QRect(100,100,100,400));
                mpSlider->setRange(0,400);
                mpSlider->setStyleSheet(
                "QSlider::groove { background: transparent; width: 4px; } "
                "QSlider::handle { background: blue; border-radius: 5px; border: 1px solid gray; height:200px;}");
                connect(mpSlider,&QSlider::valueChanged,[this](int value) { setWindowTitle("Slider value: " + QString::number(value));});
                

                should give you this:
                Screenshot 2021-06-21 at 11.41.07.png

                SPlattenS Offline
                SPlattenS Offline
                SPlatten
                wrote on last edited by
                #11

                @hskoglund, thank you, where on the slider is the value indicated?

                Kind Regards,
                Sy

                mrjjM 1 Reply Last reply
                0
                • SPlattenS SPlatten

                  @hskoglund, thank you, where on the slider is the value indicated?

                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by mrjj
                  #12

                  @SPlatten

                  QSlider don't show the current value as far as i know.

                  there is a handy subclass here to get text the handle.
                  https://stackoverflow.com/questions/18383885/qslider-show-min-max-and-current-value

                  Also do note that a 4 pixel slider will drive people nuts on a hi res screen.

                  SPlattenS 1 Reply Last reply
                  1
                  • mrjjM mrjj

                    @SPlatten

                    QSlider don't show the current value as far as i know.

                    there is a handy subclass here to get text the handle.
                    https://stackoverflow.com/questions/18383885/qslider-show-min-max-and-current-value

                    Also do note that a 4 pixel slider will drive people nuts on a hi res screen.

                    SPlattenS Offline
                    SPlattenS Offline
                    SPlatten
                    wrote on last edited by
                    #13

                    @mrjj , the application itself is being written for a specific target in mind, its for training software.

                    Kind Regards,
                    Sy

                    mrjjM 1 Reply Last reply
                    0
                    • SPlattenS SPlatten

                      @mrjj , the application itself is being written for a specific target in mind, its for training software.

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

                      @SPlatten

                      Hi
                      Ok. Well so its purpose with such a tiny scrollbar.
                      I guess that makes better sense then.

                      SPlattenS 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        @SPlatten

                        Hi
                        Ok. Well so its purpose with such a tiny scrollbar.
                        I guess that makes better sense then.

                        SPlattenS Offline
                        SPlattenS Offline
                        SPlatten
                        wrote on last edited by
                        #15

                        @mrjj , its not really my decision, I'm working to a specification which includes mock images.

                        Kind Regards,
                        Sy

                        1 Reply Last reply
                        0
                        • hskoglundH hskoglund

                          Hi, dug up some old code that assumes you have a vertical QSlider with a height of say 400 pixels, minimum = 0, maximum = 400, singleStep = 1 and pageStep = 25:

                          mpSlider->setStyleSheet(
                              "QSlider::groove { background: transparent; width: 4px; } "
                              "QSlider::handle { background: blue; border-radius: 5px; border: 1px solid gray; height:200px;}");
                          

                          then moving the slider will give you values between 0 and 400 :-)

                          Edit:
                          here's the simplified test program, create a vanilla QWidget app, in mainwindow.cpp and #include "qslider.h" and insert this code in MainWindow::MainWindow() after ui->setupUi(this):

                          auto mpSlider = new QSlider(Qt::Vertical,this);
                          mpSlider->setGeometry(QRect(100,100,100,400));
                          mpSlider->setRange(0,400);
                          mpSlider->setStyleSheet(
                          "QSlider::groove { background: transparent; width: 4px; } "
                          "QSlider::handle { background: blue; border-radius: 5px; border: 1px solid gray; height:200px;}");
                          connect(mpSlider,&QSlider::valueChanged,[this](int value) { setWindowTitle("Slider value: " + QString::number(value));});
                          

                          should give you this:
                          Screenshot 2021-06-21 at 11.41.07.png

                          SPlattenS Offline
                          SPlattenS Offline
                          SPlatten
                          wrote on last edited by SPlatten
                          #16

                          @hskoglund , sorry for the delay, been busy with other stuff.

                              QRect rctGeom(rect());
                              int intHeight(rctGeom.height()),
                              //Using the maximum and minimum actual values calculate percentage visible
                                  intSpan(truth::msintMaximum - truth::msintMinimum);
                              double dblPercent = (double)intHeight / (double)intSpan,
                              //Now work out how much of the scale the percentage into the visible area
                                     dblVisible = dblPercent * intHeight;
                              QString strStyle(QString("QSlider::handle {"
                                                       "background:blue;"
                                                       "border-radius: 0px;"
                                                       "border: 1px solid gray;"
                                                       "height: %1px;}").arg((int)dblVisible));
                              truth::mspSlider->setStyleSheet(strStyle);
                          

                          intHeight contains 486
                          intSpan contains 2000
                          dblPercent contains 0.243
                          dblVisible contains 118.098
                          strStyle contains:

                          QSlider::handle {background:blue;border-radius: 0px;border: 1px solid gray;height: 118px;}
                          

                          However what I'm seeing on the screen is:
                          5a65b6d2-c6f8-40d4-ac99-3b95d0f4a745-image.png
                          So clearly the handle is not 118 px, what haven't I done?

                          Kind Regards,
                          Sy

                          1 Reply Last reply
                          0
                          • hskoglundH Online
                            hskoglundH Online
                            hskoglund
                            wrote on last edited by
                            #17

                            Hi, I also stumbled on this (QSlider refusing to cooperate). What's odd here is to make that height of 118px work, you also have to mess with QSlider's groove in your setStyleShee() call. And the easiest way was to make it invisible, like this:

                            QString strStyle(QString(
                            "QSlider::groove { background: transparent; } "
                            "QSlider::handle {"
                            "background:blue;"
                            "border-radius: 0px;"
                            "border: 1px solid gray;"
                            "height: %1px;}").arg((int)dblVisible));
                            

                            Ok problem solved, but now you got another problem: no groove.
                            If you need one, you can draw your own, I used a QFrame say like this:

                            auto pFrame = new QFrame(mpSlider->parentWidget());
                            pFrame->setGeometry(mpSlider->geometry());
                            pFrame->setFrameStyle(QFrame::VLine | QFrame::Sunken);
                            pFrame->stackUnder(mpSlider);   // z-order (important!)
                            

                            note: maybe some more settings are needed on that QFrame for grey color etc. to make it look more like a QSlider's groove :-)

                            SPlattenS 1 Reply Last reply
                            4
                            • hskoglundH hskoglund

                              Hi, I also stumbled on this (QSlider refusing to cooperate). What's odd here is to make that height of 118px work, you also have to mess with QSlider's groove in your setStyleShee() call. And the easiest way was to make it invisible, like this:

                              QString strStyle(QString(
                              "QSlider::groove { background: transparent; } "
                              "QSlider::handle {"
                              "background:blue;"
                              "border-radius: 0px;"
                              "border: 1px solid gray;"
                              "height: %1px;}").arg((int)dblVisible));
                              

                              Ok problem solved, but now you got another problem: no groove.
                              If you need one, you can draw your own, I used a QFrame say like this:

                              auto pFrame = new QFrame(mpSlider->parentWidget());
                              pFrame->setGeometry(mpSlider->geometry());
                              pFrame->setFrameStyle(QFrame::VLine | QFrame::Sunken);
                              pFrame->stackUnder(mpSlider);   // z-order (important!)
                              

                              note: maybe some more settings are needed on that QFrame for grey color etc. to make it look more like a QSlider's groove :-)

                              SPlattenS Offline
                              SPlattenS Offline
                              SPlatten
                              wrote on last edited by
                              #18

                              @hskoglund , thank you, that works.

                              Kind Regards,
                              Sy

                              1 Reply Last reply
                              0

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