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<h1 id="title">SourceDoc/MenuSystem</h1>
<div lang="en" id="content" dir="ltr">
<a id="top"></a>
<ol>
<li>
<a href="#head-5456630128205ca9c5cffda39b968f830e6c3b1c">Menu</a>
</li>
<li>
<a href="#head-745663ded2204e23999cba5c295081d54eb62ff7">Item</a>
</li>
<li>
<a href="#head-e171ce35ecb580c146c909812d4fc011e486d23c">MenuItem</a>
</li>
<li>
<a href="#head-6b5342fa4ca3fa43b25c4b5bbe2d443ae179757b">MenuWidget</a>
</li>
<li>
<a href="#head-40dd9f480765c6bc3166db16cedd43b94a0f2bcc">Example</a>
</li>
</ol>
<p> </p>
<p>Menu's in freevo are done using the classes described below. But in general
they are essential lists of items which have their names displayed in the list.
Each item then has actions associated with them. The first action is the one
used when selected and you can use enter to see the others. Menu's also have
actions that can be associated with them to perform actions or updates. </p>
<p>PleaseUpdate: The following doc is copied from the "Plugin Writing Howto"
and needs to be checked if the information is still valid. Maybe also create
simpler examples with more documentation. </p>
<h2 id="head-5456630128205ca9c5cffda39b968f830e6c3b1c">Menu</h2>
<p>Menu is essentially a class wrapped around an array of choices. It has
several methods but the constructor is the most commonly used. It takes a
title, then an array of options, and then some optional parameters. The
reload_func is the most commonly used. The reload_func is used when you come
back from executing an item. It's only used when you want to show something
other than the menu you started with when you come back.
</p>
<pre>
# make the command menu using the command_items array and when we
# call refresh with the reload arg we go back to the main menu.
command_menu = menu.Menu(_('Commands'), command_items,
reload_func=menuwidget.goto_main_menu)
# make a basic menu with the string variable name for its name and
# items the array of choices.
mymenu = menu.Menu(name, items)
</pre>
<h2 id="head-745663ded2204e23999cba5c295081d54eb62ff7">Item</h2>
<p>Item is the base class for anything that appears in the Menu. Generally you
create a subclass of Item and then create an actions method to tell the menu
what to do when the item is clicked. The name property is what the Menu object
uses to display on the screen. You can then create other variables to hold
important data points in.
</p>
<pre>
class CoolItem(Item):
def __init__(self, command):
Item.__init__(self)
self.name = command
self.image = util.getimage(self.cmd)
def actions(self):
"""
return a list of actions for this item
"""
items = [ ( self.runMyCommand , _('Run Command') ) ]
return items
def runMyCommand(self, arg=None, menuw=None):
# do some real cool stuff..
</pre>
<h2 id="head-e171ce35ecb580c146c909812d4fc011e486d23c">MenuItem</h2>
<p>This is a convenience class it is useful in two different situations. The
first and most common is for creating Menus to display error conditions. The
second use is for when you only need a very simple item with a single easy
action. </p>
<p>To use MenuItem in the error condition case you call the constructor with
three parameters. The first parameter is what to display in the menu, the
second is the action to take when the item to select and the third is put the
arg to the action function. In this case you typically wrap the constructor
call into an append to your list of items to be given to menu. </p>
<p>To use MenuItem as a simple Item and not bother with creating your own sub
item class, you again call the constructor with the set of three parameters.
The first parameter is what to display in the menu, the second is the action to
take when the item to select and the third is put the arg to the action
function. But typically you save a reference to this item and set a few
additional parameters manually.
</p>
<pre>
# you would then create a menu like normal and then push it onto the stack
command_items += [menu.MenuItem(_('No Commands found'),
menuwidget.goto_prev_page, 0)]
# generic item use for things that are simple
# you would then create a menu like normal and then push it onto the stack
if item.info.has_key('audio'):
items.append(menu.MenuItem(_('Audio selection'),
audio_selection_menu, item))
if item.info.has_key('subtitles'):
items.append(menu.MenuItem(_('Subtitle selection'),
subtitle_selection_menu, item))
if item.info.has_key('chapters'):
items.append(menu.MenuItem(_('Chapter selection'),
chapter_selection_menu, item))
</pre>
<h2 id="head-6b5342fa4ca3fa43b25c4b5bbe2d443ae179757b">MenuWidget</h2>
<p>MenuWidget or menuw as it is often labelled in the code. Is a handy utility
class where most of the menu magic happens. It has most of the default utility
actions for menus as well as the methods to manage the menu stack. </p>
<p>Common Menu Actions: </p>
<ul>
<li><p> back_one_menu: goes to the previous menu. Typically used after
deleteing the current menu. see cdbackup.py for an example. </p>
</li>
<li><p> goto_main_menu: jumps all the way back to the main menu. </p>
</li>
</ul>
<p>List of menu stack actions: </p>
<ul>
<li><p> pushmenu: used after constructing a menu, then typically a call to
refresh to display the menu. </p>
</li>
<li><p> refresh: redraw the top item on the menu stack. It is usually called
after a pushmenu call. </p>
</li>
<li><p> delete_menu: remove the currently displayed menu. </p>
</li>
</ul>
<p>PleaseUpdate: add more functions. </p>
<h2 id="head-40dd9f480765c6bc3166db16cedd43b94a0f2bcc">Example</h2>
<p>This is a full example bringing everything together </p>
<pre>
# list of items to go in the menu
mylistofitems = []
# a call to a function that returns an array of objects you would create
# your menu from. for example a call to os.listdir to return a list of strings
# containing filenames
mylistofobjects = some_func_that_returns_you_list()
# loop through our object list and add each item to the list for the menu
for myobject in mylistofobjects:
img_item = ImageItem(myobject, self)
mylistofitems += [ img_item ]
# handle the no objects found case if we get an empty list
# this uses a single menu item
if (len(mylistofitems) == 0):
mylistofitems += [menu.MenuItem(_('No Objects found'),
menuw.back_one_menu, 0)]
# create the menu using your menu list
myobjectmenu = menu.Menu(_('My Image Objects'), mylistofitems,
reload_func=menuw.back_one_menu )
# now we push our menu on the top of the stack and tell it to display
menuw.pushmenu(myobjectmenu)
menuw.refresh()
</pre>
<a id="bottom"></a>
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<p id="pageinfo" class="info" lang="en" dir="ltr">last edited 2004-12-12
10:54:16 by <span title="134.102.71.53">Dischi</span>
<br>Current version: <a
href="http://freevo.sourceforge.net/cgi-bin/freevo-2.0/SourceDoc/MenuSystem";>http://freevo.sourceforge.net/cgi-bin/freevo-2.0/SourceDoc/MenuSystem</a></p>
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<div id="page" lang="en" dir="ltr"><!-- start page -->
<h1 id="title">SourceDoc/Mbus</h1>
<div lang="en" id="content" dir="ltr">
<a id="top"></a>
<ol>
<li>
<a href="#head-6b2c7dc2c37bb4de8f07a2425979f4455abc9c89">mcomm</a>
<ol>
<li>
<a href="#head-da2c960c3e618a0716c401064b2b6b207e26509a">Creating a server</a>
</li>
<li>
<a href="#head-fc8f2a0c3bf9ac26c708aa5efae3bc454dab6876">Client</a>
</li>
</ol>
<li>
<a href="#head-60aaf65c3022011dec7475b38384b80dd246250e">PyMbus</a>
</li>
</ol>
<p> </p>
<h2 id="head-6b2c7dc2c37bb4de8f07a2425979f4455abc9c89">mcomm</h2>
<p>mcomm.py is a small layer between Freevo and PyMbus to make usage of the
mbus simpler. Warning: the interface itself may change in the future, but only
on some minor details. </p>
<p>Freevo has a wrapper for the important mbus functions for easier access
inside helpers and plugins. By using the wrapper, the application will join the
mbus with the following naming scheme: "app=freevo, type=home-theatre,
module=name" with name being the name of the helper or 'core' for the main
freevo application. </p>
<p>First let's make an example how to use client server communication over
mbus. That's the only thing working right now in the wrapper, events will come
later. PyMbus supports much more than the mcomm layer, so maybe it is necessary
to import mbus in a plugin for special stuff. </p>
<h3 id="head-da2c960c3e618a0716c401064b2b6b207e26509a">Creating a server</h3>
<p>To create a server you must inherit from mcomm.RPCServer. It is possible to
have more than one server on one bus, the class is only a wrapper for easy
access. Each function starting with __rpc_ and ending with __ will be
registered as rpc to the mbus entity. So let's say you have a plugin listening
to the rpc home.theatre.play, you would create the following plugin:
</p>
<pre>
class PluginInterface(plugin.Plugin, mcomm.RPCServer):
def __init__(self):
plugin.Plugin.__init__(self)
mcomm.RPCServer.__init__(self)
def __rpc_play__(self, addr, val):
file = self.parse_parameter(val, ( str, ))
if not eventhandler.is_menu():
return mcomm.RPCError('freevo not in menu mode')
menuw = eventhandler.get()
parent = menuw.menustack[-1].selected
for p in plugin.mimetype(None):
i = p.get(parent, [ file ] )
if i and hasattr(i[0], 'play'):
i[0].play(menuw=menuw)
return mcomm.RPCReturn([])
return mcomm.RPCError('no player found')
</pre>
<p>Simple, isn't it? </p>
<h3 id="head-fc8f2a0c3bf9ac26c708aa5efae3bc454dab6876">Client</h3>
<p>Now, how does the client look like? </p>
<pre>
freevo = mcomm.find('freevo')
if not freevo:
print 'freevo not running'
sys.exit(0)
try:
freevo.play('/my/file.mp3')
except mcomm.MException, e:
print e
</pre>
<p>That's all. mcomm.find will wait on the bus until the freevo core comes up
(timeout 10 sec). Calling freevo.play will result in a mbus call
home-theatre.play with the given argument. There are three possible returns:
</p>
<p>1. (True, return values): The server sent mcomm.RPCReturn(return values).
Everything worked as expected. </p>
<p>2. (False, reason): The server send mcomm.RPCError(reason). The parameter
are ok, but it was not possible to do what expected. </p>
<p>3. mcomm.MException is raised. Something went wrong. Possible reasons are a
crash on server side, a server not answering and so on. </p>
<p>freevo.play will block until the result is there. If you don't want to wait,
you can specify a callback to the function:
</p>
<pre>
freevo.play('/my/file.mp3', callback=my_function)
</pre>
<p>This callback will get the raw mbus return, no True, False or MException
stuff. </p>
<h2 id="head-60aaf65c3022011dec7475b38384b80dd246250e">PyMbus</h2>
<p>PleaseUpdate: add basic PyMbus doc here </p>
<a id="bottom"></a>
</div>
<p id="pageinfo" class="info" lang="en" dir="ltr">last edited 2004-12-12
11:08:31 by <span title="134.102.71.53">Dischi</span>
<br>Current version: <a
href="http://freevo.sourceforge.net/cgi-bin/freevo-2.0/SourceDoc/Mbus";>http://freevo.sourceforge.net/cgi-bin/freevo-2.0/SourceDoc/Mbus</a></p>
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<div id="page" lang="en" dir="ltr"><!-- start page -->
<h1 id="title">SourceDoc/PyEPG</h1>
<div lang="en" id="content" dir="ltr">
<a id="top"></a>
<ol>
<li>
<a href="#head-a2107bc32b8b821c9c1e2edfa936eaecc507741e">Setup the database</a>
</li>
<li>
<a href="#head-b8773bc18a6308428cfda06bfa9e33f729b9d9f2">Update the database</a>
<ol>
<li>
<a href="#head-1c9d34b9af41344d64061bab977e2093b7459a2a">Using the XMLTV
backend</a>
</li>
<li>
<a href="#head-20e8543fa3acf8ff1ab8d665b8fc4779be541499">Using the VDR
backend</a>
</li>
</ol>
<li>
<a href="#head-02edeab41680c7a34aca2e1a3175eb310803c2ec">Access the database</a>
<ol>
<li>
<a href="#head-6393b14fb772eacd6505d6dee8fa09342f268fec">Getting channels</a>
</li>
<li>
<a href="#head-48922fa729a6982fafdff8709ba01638d9a2a43c">Using the channel
objects to get program listing</a>
</li>
<li>
<a href="#head-9357e4ec774c557de7688a5e206d6f4b98e714ca">Searching the
database</a>
</li>
</ol>
<li>
<a href="#head-9f69672c29b1795feaff6e02547d4bc3aac4ed5a">Writing a source
backend</a>
</li>
<li>
<a href="#head-8b570a5eb627e6650735a33846c9ae985c510ef6">Writing a database
backend</a>
</li>
</ol>
<p> </p>
<p>PyEPG is an electronic program guide with a database frontent. It is located
in the Freevo source tree at lib/pyepg but it does not depend on Freevo. It
only depends on a working sql database interface, right now only <a
class="external" href="http://sqlite.sf.net";><img
src="../modern/img/moin-www.png" alt="[WWW]" height="11" width="11">
pysqlite</a> is supported. </p>
<h2 id="head-a2107bc32b8b821c9c1e2edfa936eaecc507741e">Setup the database</h2>
<p>Before a program can use PyEPG the module needs to be connect to a database
and load the channel list. To connect to a database you need to specify the
type of the database and arguments this databse needs. For sqlite this is the
path of the databse file.
</p>
<pre>
pysql.connect('sqlite', '/path/to/db')
</pre>
<p>After that the database must be loaded. This will load all channel
informatiosn from the database and create an internal structure of channels.
You can add channels to the internal list even if they are not in the database
itself, rename channels or exclude channels from the guide. The load function
has two optional parameters, the first one the list of (channel id, name) to be
added and the second one a list of channel ids to be excluded. If the channel
id of the first parameter is already in the database, the internal channel name
will be replaced with the given one. All channels given here will also be added
on top of the internal list.
</p>
<pre>
channels = [ ('ard.de', 'ARD'), ('zdf.de': 'ZDF') ]
exclude = [ 'prosieben.de' ]
pyepg.load(channels, exclude)
</pre>
<h2 id="head-b8773bc18a6308428cfda06bfa9e33f729b9d9f2">Update the database</h2>
<p>To update the database call the PyEPG update function. The first parameter
if the backend which should do the update. Right now there are two backends:
xmltv and vdr. Both have a different set of arguments, so the specific update
call is different. </p>
<h3 id="head-1c9d34b9af41344d64061bab977e2093b7459a2a">Using the XMLTV
backend</h3>
<p>The <a href="../XMLTV.html">XMLTV</a> backend gets only one additional
parameter, the TV.xml file containing the data.
</p>
<pre>
pyepg.update('xmltv', '/tmp/TV.xml')
</pre>
<h3 id="head-20e8543fa3acf8ff1ab8d665b8fc4779be541499">Using the VDR
backend</h3>
<p>PleaseUpdate: add description </p>
<h2 id="head-02edeab41680c7a34aca2e1a3175eb310803c2ec">Access the database</h2>
<h3 id="head-6393b14fb772eacd6505d6dee8fa09342f268fec">Getting channels</h3>
<p>There are two ways to get a channel object. The first one is using
_<tt>_getitem_</tt>_ on the guide object. It is possible to use an integer as
index or the database id. The second way is to use the channel object which is
a sorted list of all channels. </p>
<pre>
pyepg.channels
pyepg.guide[2]
pyepg.guide['ard.de']
</pre>
<p>When you have a channel object, you can get previous and following channels
with the get_channel function. This function will wrap around if the begging or
end of the list is reached.
</p>
<pre>
c = pyepg.guide[2]
pypeg.guide[4] == pyepg.get_channel(c, 2)
</pre>
<h3 id="head-48922fa729a6982fafdff8709ba01638d9a2a43c">Using the channel
objects to get program listing</h3>
<p>If you have a channel object, you can access it's attributes and program
listings. You can access every time frame you want, if no data is in the
database at this point, dummy programs with the id -1 will be returned. </p>
<p>The channel has the following attributes: </p>
<ul>
<li><p> id: id inside the database </p>
</li>
<li><p> access_id: access id for tuner etc. </p>
</li>
<li><p> logo: url of a logo </p>
</li>
<li><p> name: channel name </p>
</li>
<li><p> title: channel display name </p>
</li>
</ul>
<p>To get programs from the epg about the channel use __getitem__ function from
Python.
</p>
<pre>
channel = pyepg.guide['ard.de']
now = time.time()
channel[now] # what is running now
channel[now:now + 60*60] # what is running in the next hour
channel[now:] # everything in the db from now on
</pre>
<h3 id="head-9357e4ec774c557de7688a5e206d6f4b98e714ca">Searching the
database</h3>
<p>You can use the search function to search the guide for a specific title. On
optional second parameter is a channel id if you want to limit the search to a
specific channel. Result is a list of Program objects.
</p>
<pre>
pyepg.search('Tagesschau')
pyepg.search('Heute Journal', 'zdf.de')
</pre>
<h2 id="head-9f69672c29b1795feaff6e02547d4bc3aac4ed5a">Writing a source
backend</h2>
<p>A source must be in the current Python path and must be named
source_backend.py, e.g. source_xmltv.py or source_vdr.py. It needs to provide
an update function. This function gets the guide object as first parameter and
all other parameters from the pyepg.update call. </p>
<p>The source backend will need some internal functions from the guide itself
to add the channels and programs to the database.
</p>
<pre>
guide.sql_add_channel(id, display_name, access_id)
guide.sql_get_channel_ids()
guide.sql_add_program(self, channel_id, title, start, stop,
subtitle, description, episode)
guide.exclude_channels
</pre>
<h2 id="head-8b570a5eb627e6650735a33846c9ae985c510ef6">Writing a database
backend</h2>
<p>A database backend must be in the current Python path and must be named
db_backend.py, e.g. db_sqlite.py or db_mysql.py. The name of the class must be
'Database'. The arguments of the init function will be based to the object when
calling 'pyepg.connect'. The database backend must provide three functions:
'execute', 'commit' and 'close'. In case of blocking the database must take
care of <a href="../SourceDoc/Notifier.html">PyNotifier</a> to keep the main
loop alive.
</p>
<pre>
class Database:
def __init__(self, argument listing):
[...]
def execute(self, query):
[...]
def commit(self):
[...]
def close(self):
[...]
</pre>
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<p id="pageinfo" class="info" lang="en" dir="ltr">last edited 2004-12-12
15:04:41 by <span title="blk-215-73-155.eastlink.ca">rshortt</span>
<br>Current version: <a
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<p> </p>
<p>PleaseUpdate: add usage description </p>
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<p id="pageinfo" class="info" lang="en" dir="ltr">last edited 2004-12-11
12:34:01 by <span title="134.102.71.53">Dischi</span>
<br>Current version: <a
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<p>PleaseUpdate: add usage description </p>
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<p id="pageinfo" class="info" lang="en" dir="ltr">last edited 2004-12-11
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<br>Current version: <a
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