1 # this is the abstract interface for Plugin instances
2 # so it should be specialized in real plugin classes
3 # like e.g. plugins.simplelist.SimpleList
7 from django.template.loader import render_to_string
9 from engine.prelude import Prelude
13 # [ 'SliceList', 'TabbedView' ] : to debug these classes
14 # True : to debug all slices
16 DEBUG= [ 'SliceList' ]
22 def __init__ (self, visible=True, hidable=True, hidden_by_default=False, **settings):
23 # xxx should generate some random id
28 self.hidden_by_default=hidden_by_default
29 # we store as a dictionary the arguments passed to constructor
30 # e.g. SimpleList (list=[1,2,3]) => _settings = { 'list':[1,2,3] }
31 # our own settings are not made part of _settings but could be..
32 self._settings=settings
34 print "Plugin.__init__ Created plugin with settings %s"%self._settings.keys()
36 # subclasses might handle some fields in their own way,
37 # in which case this call is needed to capture that setting
38 # see e.g. SimpleList or SliceList for an example of that
39 def add_to_settings (self, setting_name):
40 self._settings[setting_name]=getattr(self,setting_name)
43 try: return self.__class__.__name__
44 except: return 'Plugin'
46 # shorthands to inspect _settings
47 def get_setting (self, setting, default=None):
48 if setting not in self._settings: return default
49 else: return self._settings[setting]
51 def is_visible (self): return self.visible
52 def is_hidable (self): return self.hidable
53 def is_hidden_by_default (self): return self.hidden_by_default
56 def need_debug (self):
57 if not DEBUG: return False
58 if DEBUG is True: return True
59 else: return self.classname() in DEBUG
61 # returns the html code for that plugin
62 # in essence, wraps the results of self.render_content ()
63 def render (self, request):
65 classname = self.classname()
66 # initialize prelude placeholder
67 self._init_request (request)
70 plugin_content = self.render_content (request)
71 # expose _settings in json format to js
72 settings_json = json.dumps (self._settings, separators=(',',':'))
74 result = render_to_string ('widget-plugin.html',
76 'classname':classname,
77 'visible':self.is_visible(),
78 'hidable':self.is_hidable(),
79 'hidden':self.is_hidden_by_default(),
80 'plugin_content' : plugin_content,
81 'settings_json' : settings_json,
84 # handle requirements() if defined on this class
86 self.handle_requirements (request, self.requirements())
87 except AttributeError:
88 # most likely the object does not have that method defined, which is fine
97 # you may redefine this completely, but if you don't we'll just use methods
98 # . template() to find out which template to use, and
99 # . render_env() to compute a dictionary to pass along to the templating system
100 def render_content (self, request):
101 """Should return an HTML fragment"""
102 template = self.template()
103 env=self.render_env(request)
104 if not isinstance (env,dict):
105 raise Exception, "%s.render_env returns wrong type"%self.classname()
106 # expose this class's settings to the template
107 # xxx we might need to check that this does not overwrite env..
108 env.update(self._settings)
109 result=render_to_string (template, env)
110 if self.need_debug():
111 print "%s.render_content: BEG --------------------"%self.classname()
112 print "template=%s"%template
113 print "env=%s"%env.keys()
115 print "%s.render_content: END --------------------"%self.classname()
118 #################### requirements/prelude management
119 def _init_request (self, request):
120 if not hasattr (request, 'plugin_prelude'):
121 request.plugin_prelude=Prelude()
123 def inspect_request (self, request, message):
124 has=hasattr(request,'plugin_prelude')
125 get=getattr(request,'plugin_prelude','none-defined')
126 print "INSPECT (%s), hasattr %s, getattr %s"%(message,has,get)
128 # can be used directly in render_content()
129 def add_js_files (self, request, files):
130 self._init_request (request)
131 request.plugin_prelude.add_js_files (files)
132 def add_css_files (self, request, files):
133 self._init_request (request)
134 request.plugin_prelude.add_css_files (files)
135 def add_js_chunks (self, request, chunks):
136 self._init_request (request)
137 request.plugin_prelude.add_js_chunks (chunks)
138 def add_css_chunks (self, request, chunks):
139 self._init_request (request)
140 request.plugin_prelude.add_css_chunks (chunks)
142 # or from the result of self.requirements()
143 def handle_requirements (self, request, d):
144 for (k,v) in d.iteritems():
145 if self.need_debug():
146 print "%s: handling requirement %s"%(self.classname(),v)
148 method=Plugin.__dict__[method_name]
149 method(self,request,v)
151 ######################################## abstract interface
152 def title (self): return "you should redefine title()"
154 # your plugin is expected to implement either
155 # (*) def render_content(self, request) -> html fragment
157 # (*) def template(self) -> filename
159 # (*) def render_env (self, request) -> dict
160 # this is the variable->value association used to render the template
161 # in which case the html template will be used
163 # if you see this string somewhere your template() code is not kicking in
164 def template (self): return "undefined_template"
165 def render_env (self, request): return {}
167 # # tell the framework about requirements (for the document <header>)
168 # # the notion of 'Media' in django provides for medium-dependant
169 # # selection of css files
170 # # as a first attempt however we keep a flat model for now
171 # # can use one string instead of a list or tuple if needed,
172 # # see requirements.py for details
173 # def requirements (self):
174 # return { 'js_files' : [], # a list of relative paths for js input files
175 # 'css_files': [], # ditto for css, could have been a dict keyed on
177 # 'js_chunk' : [], # (lines of) verbatim javascript code
178 # 'css_chunk': [], # likewise for css scripts