How can i change the size of my icon?

[victor wang]

Hi, i'm using qt5.5 on my computer.
This is my user interface here.
http://imgur.com/wA4spzB

How can i change the size which i marked it in the picture?

Please Help!

[raven-worx]

@victor-wang
Are you using a stylesheet now?
If not you can apply a custom QProxyStyle to your tab-bar widget:

class MyProxyStyle : public QProxyStyle
{
public:
     ....

    virtual int pixelMetric(QStyle::PixelMetric metric, const QStyleOption * option = 0, const QWidget * widget = 0) const
    {
             if( metric == QStyle::PM_TabBarScrollButtonWidth )
                    return 30;
             else
                     return QProxyStyle::pixelMetricmetric, option, widget);
    }
};

[victor wang]

@raven-worx
But i am using stylesheet.
Is there any way to change the size of icon if i am using stylesheet?

[raven-worx]

@victor-wang
Try:

QTabBar::scroller { /* the width of the scroll buttons */
    width: 20px;
}