## Nemo.InfoProvider

Nemo.InfoProvider — Nemo.InfoProvider Reference

## Synopsis

     Nemo.InfoProvider {
      update_file_info(file);
      update_file_info_full(provider,
                            handle,
                            closure,
                            file);
      cancel_update(provider,
                    handle);
      Nemo.info_provider_update_complete_invoke(provider,
                                                handle,
                                                closure,
                                                result= Nemo.OperationResult.COMPLETE);
    }

## Description

If subclassed, Nemo will call update_file_info(_full) to notify extensions of which files are being viewed by the user. This gives extensions an opportunity to invoke actions on the files, or to add emblems or attributes.

Example 3. Nemo.InfoProvider Example

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    from gi.repository import Nemo, GObject

    class ColumnExtension(GObject.GObject, Nemo.InfoProvider):
        def __init__(self):
            pass

        def update_file_info_full(self, provider, handle, closure, file):
            gobject.timeout_add_seconds(3, self.update_cb, provider, handle, closure)
            return Nemo.OperationResult.IN_PROGRESS

        def update_cb(self, provider, handle, closure):
            Nemo.info_provider_update_complete_invoke(closure, provider, handle, Nemo.OperationResult.FAILED)

## Passive Methods

### Nemo.InfoProvider.update_file_info

    update_file_info(file);

`file` : | a `Nemo.FileInfo` object

This method is called by Nemo for each file or folder that exists under the current directory listing. There is no return value.

### Nemo.InfoProvider.update_file_info_full

    update_file_info_full(provider,
                          handle,
                          closure,
                          file);

`provider` : | the current `Nemo.InfoProvider` instance
`handle` : | a `gobject.gpointer` generated solely to track this call
`closure` : | a C Closure that must be passed to Nemo.info_provider_update_complete_invoke if that method is called
`file` : | a `Nemo.FileInfo` object
Returns : | None or a `Nemo.OperationResult` enum

This method is called by Nemo for each file or folder that exists under the current directory listing. Originally, `Nemo.InfoProvider` only provided the update_file_info method, which blocked Nemo when the method required a lot of computation time. This method was created to allow an extension to tell Nemo that it will be spending time on an operation and that Nemo should not block itself during that time.

In order to notify Nemo of your extension's intentions, you must return a `Nemo.OperationResult` enum. Then, when the operation has completed, call the Nemo.info_provider_update_complete_invoke method, passing the provider, handle and closure variables as parameters.

This method was created for backwards compatibility reasons. If your extension used the `update_file_info` method and you want non-blocking usage, you should switch to this method.

This method was introduced in nemo-python 0.7.0.

### Nemo.InfoProvider.cancel_update

    cancel_update(provider,
                  handle);

`provider` : | the current `Nemo.InfoProvider` instance
`handle` : | a `gobject.gpointer` generated by a specific update_file_info_full call

This method is called by Nemo when an update_file_info_full call is in progress but is no longer required. This may happen because the user is moving directories or a file has been deleted, etc. You may use the handle parameter here to match the handle parameter passed in `update_file_info_full`.

This method was introduced in nemo-python 0.7.0.

## Active Methods

### Nemo.info_provider_update_complete_invoke

    info_provider_update_complete_invoke(provider,
                                         handle,
                                         closure,
                                         result= Nemo.OperationResult.COMPLETE);

`provider` : | the current `Nemo.InfoProvider` instance
`handle` : | a `gobject.gpointer` generated by a specific update_file_info_full call
`closure` : | a C Closure that must be passed to Nemo.info_provider_update_complete_invoke if that method is called
`result` : | an optional parameter. If left out, `Nemo.OperationResult.COMPLETE` is assumed. Otherwise, you may pass any any of the `Nemo.OperationResult` enums.

An extension must call this method for each update_file_info_full method that returns the `Nemo.OperationResult.IN_PROGRESS` enum. The method must be called with the provider, handle, and closure parameters which were passed to the earlier `update_file_info_full` method.

This method was introduced in nemo-python 0.7.0.