qt - 如何在QDockWidget标题栏中显示图标？

Question

我的QDockWidget有窗口标题和关闭按钮。如何在标题栏中放置图标？

当我从资源中为 QDockWidget WindowIcon 属性选择图标时，它也不起作用。

有什么想法吗？

Answer 1

通过自定义代理样式:

class iconned_dock_style: public QProxyStyle{
    Q_OBJECT
    QIcon icon_;
public:
    iconned_dock_style(const QIcon& icon,  QStyle* style = 0)
        : QProxyStyle(style)
        , icon_(icon)
    {}

    virtual ~iconned_dock_style()
    {}

    virtual void drawControl(ControlElement element, const QStyleOption* option,
        QPainter* painter, const QWidget* widget = 0) const
    {
        if(element == QStyle::CE_DockWidgetTitle)
        {
            //width of the icon
            int width = pixelMetric(QStyle::PM_ToolBarIconSize);
            //margin of title from frame
            int margin = baseStyle()->pixelMetric(QStyle::PM_DockWidgetTitleMargin);

            QPoint icon_point(margin + option->rect.left(), margin + option->rect.center().y() - width/2);

            painter->drawPixmap(icon_point, icon_.pixmap(width, width));

            const_cast<QStyleOption*>(option)->rect = option->rect.adjusted(width, 0, 0, 0);
        }
        baseStyle()->drawControl(element, option, painter, widget);
    }
};

示例:

QDockWidget* w("my title", paretn);
w->setStyle(new iconned_dock_style( QIcon(":/icons/icons/utilities-terminal.png"), w->style()));