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NautilusInfoProvider allows extension to provide additional information about
files. When nautilus_info_provider_update_file_info() is called by the application,
extensions will know that it's time to add extra information to the provided
NautilusFileInfo.
NautilusOperationResult nautilus_info_provider_update_file_info (NautilusInfoProvider *provider,NautilusFileInfo *file,GClosure *update_complete,NautilusOperationHandle **handle);
void nautilus_info_provider_cancel_update (NautilusInfoProvider *provider,NautilusOperationHandle *handle);
void nautilus_info_provider_update_complete_invoke (GClosure *update_complete,NautilusInfoProvider *provider,NautilusOperationHandle *handle,NautilusOperationResult result);
struct NautilusInfoProviderInterface {
    GTypeInterface g_iface;
    NautilusOperationResult (*update_file_info) (NautilusInfoProvider     *provider,
                                                 NautilusFileInfo         *file,
                                                 GClosure                 *update_complete,
                                                 NautilusOperationHandle **handle);
    void                    (*cancel_update)    (NautilusInfoProvider     *provider,
                                                 NautilusOperationHandle  *handle);
};
Interface for extensions to provide additional information about files.
| Returns a NautilusOperationResult.
See  | ||
| Cancels a previous call to  | 
typedef struct _NautilusOperationHandle NautilusOperationHandle;
Handle for asynchronous interfaces. These are opaque handles that must be unique within an extension object. These are returned by operations that return NAUTILUS_OPERATION_IN_PROGRESS.
Return values for asynchronous operations performed by the extension.
See nautilus_info_provider_update_file_info().