QToolbar Extension Button Stylesheet

[jineshmehta]

How can I change the icon of QToolbar Extension Tool button Icon from ">>" to something custom?

Thanks in advance.

[Bonnie]

AFAIK, there's no stylesheet for that button icon.

A cheating way is to set the icon property by the object name written in the Qt source code.

QToolButton#qt_toolbar_ext_button{qproperty-icon:url(your_custom_image_url)}

But the icon will be reset when toolbar's orientation changed, so if your toolbar's orientation may change, you need to connect to orientationChanged signal and set the stylesheet again.

Note: The above method may become invalid if Qt changes the source code in the future.

Another way is to implement a QProxyStyle and set it to be the application's style.

class MyProxyStyle : public QProxyStyle
{
  public:
    QIcon standardIcon(QStyle::StandardPixmap standardIcon, const QStyleOption *option = nullptr,
                       const QWidget *widget = nullptr) const override
    {
        if(standardIcon == QStyle::SP_ToolBarHorizontalExtensionButton)
            return QIcon("your_custom_image_url_for_horizontal");
        else if (standardIcon == QStyle::SP_ToolBarVerticalExtensionButton)
            return QIcon("your_custom_image_url_for_vertical");
        return QProxyStyle::standardIcon(standardIcon, option, widget);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.setStyle(new MyProxyStyle);
     ...
    return a.exec();
}

Note: This will work on all toolbars in the application.