Lists all tasks in the task list tasklist_id, calling the cb for each of them.
| this |
an GDataSession |
| tasklist_id |
id of a task list |
| query |
an GDataQuery to limit returned tasks, or null |
| cb |
an GDataObjectCallback to call for each found task |
| cancellable |
optional Cancellable object, or null |
| user_data |
user data passed to the |
|
whether succeeded |