Asynchronously request the this contents converted to a string.
When the operation is finished callback will be called. You must then call [[email protected]_text_finish] to get
the result.
This is a simple wrapper around [[email protected]_value_async]. Use that function or [[email protected]_async] directly if you need more control over the operation.
| this |
a `GdkClipboard` |
| cancellable |
optional `GCancellable` object |
| callback |
callback to call when the request is satisfied |
| user_data |
the data to pass to callback function |