Qt调整QTabBar图标和文字的间距

原生的QTabBar放上图标和文字，固定QTab的宽度时，间距较大。通过自定义样式，轻松解决间距问题

#include <QProxyStyle>

class MyTabStyle : public QProxyStyle
{
    Q_OBJECT
public:
    explicit MyTabStyle (QStyle *style = nullptr) : QProxyStyle(style)
    {
    }

    virtual void drawItemText(QPainter *painter, const QRect &rect,
                              int flags, const QPalette &pal, bool enabled,
                              const QString &text,
                              QPalette::ColorRole textRole) const Q_DECL_OVERRIDE
    {
        QStyle::drawItemText(painter, rect, Qt::AlignLeft | Qt::AlignVCenter,
                             pal, enabled, text, textRole);
    }
};

应用示例：

ui->tabWidget->tabBar()->setStyle(new MyTabBar);