qt-creator/src/plugins/coreplugin/fileiconprovider.h

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#ifndef FILEICONPROVIDER_H
#define FILEICONPROVIDER_H

#include <coreplugin/core_global.h>

#include <QtCore/QFileInfo>
#include <QtCore/QPair>
#include <QtGui/QFileIconProvider>
#include <QtGui/QIcon>
#include <QtGui/QStyle>

namespace Core {

class CORE_EXPORT FileIconProvider {
public:
    ~FileIconProvider(); // used to clear the cache
    QIcon icon(const QFileInfo &fileInfo);

    QPixmap overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlayIcon, const QSize &size) const;
    void registerIconOverlayForSuffix(const QIcon &icon, const QString &suffix);

    static FileIconProvider *instance();

private:
    QIcon iconForSuffix(const QString &suffix) const;

    // mapping of file ending to icon
    // TODO: Check if this is really faster than a QHash
    mutable QList<QPair<QString, QIcon> > m_cache;

    QFileIconProvider m_systemIconProvider;
    QIcon m_unknownFileIcon;

    // singleton pattern
    FileIconProvider();
    static FileIconProvider *m_instance;
};

} // namespace Core

#endif // FILEICONPROVIDER_H