====
Flow
====

:date: 2021-02-21

Known flows:

.. uml::

   Alice -> Bob: Hi!
   Alice <- Bob: How are you?

- Login -> Flow
- Contact -> Entity
- Inspect -> Entity

Login
=====

1. [A] App run
2. [A] Select Messenger (list `*.so` )
3. [A] Load so and create Messenger
4. [A] Start `SrnFlow *login`
5. [M] Login flow logical
6. [A] Start `SrnFlow *contact`

Contact
=======

1. [A] Start `SrnFlow *contact`
2. [M] Contact flow logical
3. [M] Create SrnXXXBuffer(SrnEen)

Message
=======

Send Text
---------

1. [M] Register text entry signal handler
2. [A] User type in text entry
3. [M] Read message from text entry
4. [M] Sending
5. [A] Add a pending message
6. [M] Sent
7. [A] Update message state

Send Media
----------

1. [M] Register a button
2. [A] User click the button
3. [M] Sending
4. [A] Add a pending message
5. [M] Sent
6. [A] Update message state

Recv text
---------

1. [M] Recv callback
2. [A] Add message to buffer

Recv media
----------

1. [M] Recv callback
2. [A] Add message to buffer
3. [M] Recv done 
4. [A] Update message state

User
====

Init member list
----------------