# so it should be specialized in real plugin classes
# like e.g. plugins.simplelist.SimpleList
+import json
+
from django.template.loader import render_to_string
+from engine.pluginset import PluginSet
+from engine.prelude import Prelude
+
+####################
+# set DEBUG to
+# . False : silent
+# . [ 'SliceList', 'TabbedView' ] : to debug these classes
+# . True : to debug all plugin
+
+DEBUG= False
+#DEBUG= [ 'SimpleList' ]
+
+# decorator to deflect calls on Plugin to its PluginSet
+def to_prelude (method):
+ def actual (self, *args, **kwds):
+ prelude_method=Prelude.__dict__[method.__name__]
+ return prelude_method(self.pluginset.prelude,*args, **kwds)
+ return actual
+
class Plugin:
- uid=0
+ # using a simple incremental scheme to generate domids for now
+ # we just need this to be unique in a page
+ domid=0
- def __init__ (self, **settings):
- self.uuid=Plugin.uid
- Plugin.uid += 1
- # we store as a dictionary the arguments passed to constructor
- # e.g. SimpleList (visible=True) => _settings = {'visible':True}
- self._settings=settings
+ @staticmethod
+ def newdomid():
+ Plugin.domid += 1
+ return "plugin-%d"%Plugin.domid
- def get_class (self): return type(self).__name__
+ ##########
+ # Constructor
+ #### mandatory
+ # . pluginset: the context of the request being served
+ # . title: is used visually for displaying the widget
+ #### optional
+ # . togglable: whether it can be turned on and off (like PleKitToggle)
+ # . toggled: if togglable, what's the initial status
+ # . visible: if not set the plugin does not show up at all
+ # (not quite sure what this was for)
+ #### internal data
+ # . domid: created internally, but can be set at creation time if needed
+ # useful for hand-made css, or for selecting an active plugin in a composite
+ # . rank: this is for plugins sons of a composite plugin
+ #### custom
+ # any other setting can also be set when creating the object, like
+ # p=Plugin(foo='bar')
+ # which will result in 'foo' being accessible to the template engine
+ #
+ def __init__ (self, pluginset, title, domid=None,
+ visible=True, togglable=True, toggled=True, **settings):
+ self.pluginset = pluginset
+ self.title=title
+ if not domid: domid=Plugin.newdomid()
+ self.domid=domid
+ self.classname=self._classname()
+ self.visible=visible
+ self.togglable=togglable
+ self.toggled=toggled
+ # what comes from subclasses
+ for (k,v) in settings.iteritems():
+ setattr(self,k,v)
+ if self.need_debug(): print "%s init - subclass setting %s"%(self.classname,k)
+ # minimal debugging
+ if self.need_debug():
+ print "%s init dbg .... BEG"%self.classname
+ for (k,v) in self.__dict__.items(): print "dbg %s:%s"%(k,v)
+ print "%s init dbg .... END"%self.classname
+ # do this only once the structure is fine
+ self.pluginset.record_plugin(self)
- # shorthands to inspect _settings
- def get_setting (self, setting, default):
- if setting not in self._settings: return default
- else: return self._settings[setting]
+ def _classname (self):
+ try: return self.__class__.__name__
+ except: return 'Plugin'
- def is_visible (self): return self.get_setting ('visible',True)
- def is_hidable (self): return self.get_setting ('hidable',False)
- def is_hidden_by_default (self): return self.get_setting ('hidden_by_default', False)
+ ##########
+ def need_debug (self):
+ if not DEBUG: return False
+ if DEBUG is True: return True
+ else: return self.classname in DEBUG
+
+ def setting_json (self, setting):
+ # TMP: js world expects plugin_uuid
+ if setting=='plugin_uuid':
+ value=self.domid
+ elif setting=='query_uuid':
+ try: value=self.query.uuid
+ except: return '%s:"undefined"'%setting
+ else:
+ value=getattr(self,setting,None)
+ if not value: value = "unknown-setting-%s"%setting
+ # first try to use to_json method (json.dumps not working on class instances)
+ try: value_json=value.to_json()
+ except: value_json=json.dumps(value,separators=(',',':'))
+ return "%s:%s"%(setting,value_json)
+
+ # expose in json format to js the list of fields as described in json_settings_list()
+ # and add plugin_uuid: domid in the mix
+ # NOTE this plugin_uuid thing might occur in js files from joomla/js, ** do not rename **
+ def settings_json (self):
+ result = "{"
+ result += ",".join([ self.setting_json(setting) for setting in self.json_settings_list() ])
+ result += "}"
+ return result
# returns the html code for that plugin
# in essence, wraps the results of self.render_content ()
- def render (self):
- uuid = self.uuid
- title = self.get_class()
- plugin_content = self.render_content ()
-
- # xxx missing from the php version
- # compute an 'optionstr' from the set of available settings/options as a json string
- # that gets passed to jquery somehow
- # see the bottom of
- result = render_to_string ('render_plugin.html',
- {'uuid':uuid, 'title':title,
- 'visible':self.is_visible(),
- 'hidable':self.is_hidable(),
- 'hidden':self.is_hidden_by_default(),
- 'plugin_content' : plugin_content,
- 'optionstr' : 'xxx-todo',
- })
+ def render (self, request):
+ # call render_content
+ plugin_content = self.render_content (request)
+ # shove this into plugin.html
+ env = {}
+ env ['plugin_content']= plugin_content
+ env.update(self.__dict__)
+ result = render_to_string ('plugin.html',env)
+
+ # as a first approximation we're only concerned with plugins that are associated with a query
+ # other simpler plugins that only deal with layout do not need this
+ if 'query' in self.__dict__:
+ env ['settings_json' ] = self.settings_json()
+ # compute plugin-specific initialization
+ js_init = render_to_string ( 'plugin-setenv.js', env )
+ self.add_js_chunks (js_init)
+
+ # interpret the result of requirements ()
+ self.handle_requirements (request)
return result
+ # you may redefine this completely, but if you don't we'll just use methods
+ # . template_file() to find out which template to use, and
+ # . template_env() to compute a dictionary to pass along to the templating system
+ def render_content (self, request):
+ """Should return an HTML fragment"""
+ template = self.template_file()
+ env=self.template_env(request)
+ if not isinstance (env,dict):
+ raise Exception, "%s.template_env returns wrong type"%self.classname
+ result=render_to_string (template, env)
+ if self.need_debug():
+ print "%s.render_content: BEG --------------------"%self.classname
+ print "template=%s"%template
+ print "env.keys=%s"%env.keys()
+ #print "env=%s"%env
+ #print result
+ print "%s.render_content: END --------------------"%self.classname
+ return result
+
+ # or from the result of self.requirements()
+ def handle_requirements (self, request):
+ try:
+ d=self.requirements()
+ for (k,v) in d.iteritems():
+ if self.need_debug():
+ print "%s: handling requirement %s"%(self.classname,v)
+ method_name='add_'+k
+ method=PluginSet.__dict__[method_name]
+ method(self.pluginset,v)
+ except AttributeError:
+ # most likely the object does not have that method defined, which is fine
+ pass
+ except:
+ import traceback
+ traceback.print_exc()
+ pass
+
+ #################### requirements/prelude management
+ # just forward to self.pluginset - see decorator above
+ @to_prelude
+ def add_js_files (self):pass
+ @to_prelude
+ def add_css_files (self):pass
+ @to_prelude
+ def add_js_chunks (self):pass
+ @to_prelude
+ def add_css_chunks (self):pass
+
+ ######################################## abstract interface
+ # your plugin is expected to implement either
+ # (*) def render_content(self, request) -> html fragment
+ # -- or --
+ # (*) def template_file (self) -> filename
+ # relative to STATIC
+ # (*) def template_env (self, request) -> dict
+ # this is the variable->value association used to render the template
+ # in which case the html template will be used
+
+ # if you see this string somewhere your template_file() code is not kicking in
+ def template_file (self): return "undefined_template"
+ def template_env (self, request): return {}
+
+# # tell the framework about requirements (for the document <header>)
+# # the notion of 'Media' in django provides for medium-dependant
+# # selection of css files
+# # as a first attempt however we keep a flat model for now
+# # can use one string instead of a list or tuple if needed,
+# # see requirements.py for details
+# def requirements (self):
+# return { 'js_files' : [], # a list of relative paths for js input files
+# 'css_files': [], # ditto for css, could have been a dict keyed on
+# # media instead
+# 'js_chunk' : [], # (lines of) verbatim javascript code
+# 'css_chunk': [], # likewise for css scripts
+# }
+
+# # for better performance
+# # you can specify a list of keys that won't be exposed as json attributes
+# def exclude_from_json (self): return []
+
+ # mandatory : define the fields that need to be exposed to json as part of
+ # plugin initialization
+ # mention 'domid' if you need plugin_uuid
+ # also 'query_uuid' gets replaced with query.uuid
+ def json_settings_list (self): return ['json_settings_list-must-be-redefined']
+
git://git.onelab.eu / unfold.git / blobdiff