Qt Code: 
  1. #include <QApplication>
  2. #include <QTreeView>
  3. #include <QStandardItemModel>
  4.  
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QApplication app(argc, argv);
  9.  
  10.     QStandardItemModel model(20, 4);
  11.     for (int row = 0; row < 20; ++row) {
  12.         for (int column = 0; column < 4; ++column) {
  13.             QStandardItem *item = new QStandardItem(QString("row %0, column %1").arg(row).arg(column));
  14.             model.setItem(row, column, item);
  15.         }
  16.     }
  17.  
  19.     v.setModel(&model);
  20.     v.setStyleSheet(
  21.     "   QScrollBar:vertical {"
  22.     "       border: 2px solid grey;"
  23.     "       background: #32CC99;"
  24.     "       width: 15px;"
  25.     "       margin: 22px 0px 22px 0px;"
  26.     "   }"
  27.     "   QScrollBar::handle:vertical {"
  28.     "       border: 2px solid red;"
  29.     "       background: #ffffff;"
  30.     "       min-height: 20px;"
  31.     "   }"
  32.     "   QScrollBar::add-line:vertical {"
  33.     "       border: 2px solid grey;"
  34.     "       background: #32CC99;"
  35.     "       height: 20px;"
  36.     "       subcontrol-position: bottom;"
  37.     "       subcontrol-origin: margin;"
  38.     "   }"
  39.     "   QScrollBar::sub-line:vertical {"
  40.     "       border: 2px solid grey;"
  41.     "       background: #32CC99;"
  42.     "       height: 20px;"
  43.     "       subcontrol-position: top;"
  44.     "       subcontrol-origin: margin;"
  45.     "   }"
  46.     "   QScrollBar::up-arrow:vertical, QScrollBar::down-arrow:vertical {"
  47.     "       border: 2px solid grey;"
  48.     "       width: 3px;"
  49.     "       height: 3px;"
  50.     "       background: white;"
  51.     "   }"
  52.     "   QScrollBar::add-page:vertical, QScrollBar::sub-page:vertical {"
  53.     "       background: none;"
  54.     "   } "
  55.     );
  56.     v.show();
  57.     return app.exec();
  58. }
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