c++ - 扩展 Qt 标准图标

Question

如何扩展 QStyle 类提供的标准图标以支持 Windows 和 Linux？

namespace Ui {
  class TVLoader;
}

class TVLoader : public QMainWindow
{
  Q_OBJECT

public:
  explicit TVLoader(QWidget *parent = 0) :
  QMainWindow(parent),
  ui(new Ui::TVLoader)
{
  ui->setupUi(this);
  ui->actionAdd_TV_Show->setIcon(style()->standardIcon(?)); // this is where I would need some kind of "Add" icon which unfortunately doesn't exist
}

Answer 1

如果你想提供自己的图标，你想继承 QStyle，重新实现 standardIconImplementation () 在您的子类中插入并从那里返回一个新图标。下面是一个例子:

class MyProxyStyle : public QProxyStyle
{
    Q_OBJECT

public:
    MyProxyStyle(QStyle *style = 0) : QProxyStyle(style) { }

public slots:
    QIcon standardIconImplementation(StandardPixmap standardIcon,
                                     const QStyleOption *option = 0,
                                     const QWidget *widget = 0) const
    {
        // check the standardIcon parameter for the icon type 
        if (standardIcon==QStyle::SP_DesktopIcon)
        {
            // return your new icon here
            standardIcon = QStyle::SP_DirIcon;
        }
        return QProxyStyle::standardIconImplementation(standardIcon, option, widget);
    }
};

这里是你如何使用它:

// set new style for your widget
setStyle(new MyProxyStyle(style()));
// return different icon for QStyle::SP_DesktopIcon
action0->setIcon(style()->standardIcon(QStyle::SP_DesktopIcon));

希望这对你有帮助，问候