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QScrollBar vertical scrollbar set width

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  • 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 Offline
        hskoglundH Offline
        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 Offline
                      hskoglundH Offline
                      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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