--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/frontends/src/quick_frontend/quick_widgets.py	Wed Dec 10 19:00:09 2014 +0100
@@ -0,0 +1,187 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# helper class for making a SAT frontend
+# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from sat.core.log import getLogger
+log = getLogger(__name__)
+from sat.core import exceptions
+
+
+classes_map = {}
+
+
+def register(base_cls, child_cls=None):
+    """Register a child class to use by default when a base class is needed
+
+    @param base_cls: "Quick..." base class (like QuickChat or QuickContact), must inherit from QuickWidget
+    @param child_cls: inherited class to use when Quick... class is requested, must inherit from base_cls.
+        Can be None if it's the base_cls itself which register
+    """
+    classes_map[base_cls] = child_cls
+
+
+class QuickWidgetsManager(object):
+    """This class is used to manage all the widgets of a frontend
+    A widget can be a window, a graphical thing, or someting else depending of the frontend"""
+
+    def __init__(self, host):
+        self.host = host
+        self._widgets = {}
+
+    def getOrCreateWidget(self, class_, target, *args, **kwargs):
+        """Get an existing widget or create a new one when necessary
+
+        If the widget is new, self.host.newWidget will be called with it.
+        @param class_(class): class of the widget to create
+        @param target: target depending of the widget, usually a JID instance
+        @param args(list): optional args to create a new instance of class_
+        @param kwargs(list): optional kwargs to create anew instance of class_
+            if 'profile' key is present, it will be popped and put in 'profiles'
+            if there is neither 'profile' nor 'profiles', None will be used for 'profiles'
+            if 'on_new_widget' is present it can have the following values:
+                'NEW_WIDGET' [default]: self.host.newWidget will be called on widget creation
+                [callable]: this method will be called instead of self.host.newWidget
+                None: do nothing
+            if 'force_hash' is present, the hash given in value will be used instead of the one returned by class_.getWidgetHash
+        @return: a class_ instance, either new or already existing
+        """
+        # class management
+        try:
+            cls = classes_map[class_]
+        except KeyError:
+            cls = class_
+        if cls is None:
+            raise exceptions.InternalError("There is not class registered for {}".format(class_))
+
+        # arguments management
+        _args = [self.host, target] + list(args) or [] # FIXME: check if it's really necessary to use optional args
+        _kwargs = kwargs or {}
+        if 'profiles' in _kwargs and 'profile' in _kwargs:
+            raise ValueError("You can't have 'profile' and 'profiles' keys at the same time")
+        try:
+            _kwargs['profiles'] = _kwargs.pop('profile')
+        except KeyError:
+            if not 'profiles' in _kwargs:
+                _kwargs['profiles'] = None
+
+        # we get the hash
+        try:
+            hash_ = _kwargs.pop('force_hash')
+        except KeyError:
+            hash_ = cls.getWidgetHash(target, _kwargs['profiles'])
+
+        # widget creation or retrieval
+        widgets_list = self._widgets.setdefault(cls, {}) # we sorts widgets by classes
+        if not cls.SINGLE:
+            widget = None # if the class is not SINGLE, we always create a new widget
+        else:
+            try:
+                widget = widgets_list[hash_]
+                widget.addTarget(target)
+            except KeyError:
+                widget = None
+
+        if widget is None:
+            # we need to create a new widget
+            try:
+                #on_new_widget tell what to do for the new widget creation
+                on_new_widget = _kwargs.pop('on_new_widget')
+            except KeyError:
+                on_new_widget = 'NEW_WIDGET'
+
+            log.debug(u"Creating new widget for target {} {}".format(target, cls))
+            widget = cls(*_args, **_kwargs)
+            widgets_list[hash_] = widget
+
+            if on_new_widget == 'NEW_WIDGET':
+                self.host.newWidget(widget)
+            elif callable(on_new_widget):
+                on_new_widget(widget)
+            else:
+                assert on_new_widget is None
+
+        return widget
+
+
+class QuickWidget(object):
+    """generic widget base"""
+    SINGLE=True # if True, there can be only one widget per target(s)
+    PROFILES_MULTIPLE=False
+    PROFILES_ALLOW_NONE=False
+
+    def __init__(self, host, target, profiles=None):
+        """
+        @param host: %(doc_host)s
+        @param target: target specific for this widget class
+        @param profiles: can be either:
+            - (unicode): used when widget class manage a unique profile
+            - (iterable): some widget class can manage several profiles, several at once can be specified here
+            - None: no profile is managed by this widget class (rare)
+        @raise: ValueError when (iterable) or None is given to profiles for a widget class which manage one unique profile.
+        """
+        self.host = host
+        self.targets = set()
+        self.addTarget(target)
+        self.profiles = set()
+        if isinstance(profiles, basestring):
+            self.addProfile(profiles)
+        elif profiles is None:
+            if not self.PROFILES_ALLOW_NONE:
+                raise ValueError("profiles can't have a value of None")
+        else:
+            if not self.PROFILES_MULTIPLE:
+                raise ValueError("multiple profiles are not allowed")
+            for profile in profiles:
+                self.addProfile(profile)
+
+    @property
+    def profile(self):
+        assert len(self.profiles) == 1 and not self.PROFILES_MULTIPLE and not self.PROFILES_ALLOW_NONE
+        return list(self.profiles)[0]
+
+    def addTarget(self, target):
+        """Add a target if it doesn't already exists
+
+        @param target: target to add
+        """
+        self.targets.add(target)
+
+    def addProfile(self, profile):
+        """Add a profile is if doesn't already exists
+
+        @param profile: profile to add
+        """
+        if self.profiles and not self.PROFILES_MULTIPLE:
+            raise ValueError("multiple profiles are not allowed")
+        self.profiles.add(profile)
+
+    @staticmethod
+    def getWidgetHash(target, profiles):
+        """Return the hash associated with this target for this widget class
+
+        some widget classes can manage several target on the same instance
+        (e.g.: a chat widget with multiple resources on the same bare jid),
+        this method allow to return a hash associated to one or several targets
+        to retrieve the good instance. For example, a widget managing JID targets,
+        and all resource of the same bare jid would return the bare jid as hash.
+
+        @param target: target to check
+        @param profiles: profile(s) associated to target, see __init__ docstring
+        @return: a hash (can correspond to one or many targets or profiles, depending of widget class)
+        """
+        return unicode(target) # by defaut, there is one hash for one target