add design plugin with "design switch" view.

pylucid_project/pylucid_plugins/design/__init__.py

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+# coding: utf-8
+
+"""
+    PyLucid design plugin
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    connect signals
+
+    Last commit info:
+    ~~~~~~~~~
+    $LastChangedDate: 2009-08-11 15:39:06 +0200 (Di, 11 Aug 2009) $
+    $Rev: 2264 $
+    $Author: JensDiemer $
+
+    :copyleft: 2009-2010 by the PyLucid team, see AUTHORS for more details.
+    :license: GNU GPL v3 or above, see LICENSE for more details
+"""
+
+from pylucid_project.apps.pylucid.signals import pre_render_global_template
+
+from design.signal_receiver import pre_render_global_template_handler
+
+
+pre_render_global_template.connect(pre_render_global_template_handler)

pylucid_project/pylucid_plugins/design/admin_urls.py

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+# coding: utf-8
+
+"""
+    PyLucid admin views url patterns
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    :copyleft: 2010 by the PyLucid team, see AUTHORS for more details.
+    :license: GNU GPL v3 or above, see LICENSE for more details.
+"""
+
+from django.conf.urls.defaults import patterns, url
+
+from design import admin_views
+
+urlpatterns = patterns('',
+    url(r'^switch/$', admin_views.switch, name='Design-switch'),
+)
+

pylucid_project/pylucid_plugins/design/admin_views.py

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+# coding: utf-8
+
+"""
+    PyLucid admin views
+    ~~~~~~~~~~~~~~~~~~~
+
+    :copyleft: 2010 by the PyLucid team, see AUTHORS for more details.
+    :license: GNU GPL v3 or above, see LICENSE for more details.
+"""
+
+
+from django import http
+from django.utils.translation import ugettext as _
+
+from pylucid_project.apps.pylucid.decorators import check_permissions, render_to
+
+from pylucid_project.apps.pylucid_admin.admin_menu import AdminMenu
+
+from design.forms import SelectDesign
+from pylucid_project.apps.pylucid.models import Design
+
+
+def install(request):
+    """ insert PyLucid admin views into PageTree """
+    output = []
+
+    admin_menu = AdminMenu(request, output)
+    menu_section_entry = admin_menu.get_or_create_section("edit look")
+    admin_menu.add_menu_entry(
+        parent=menu_section_entry, url_name="Design-switch",
+        name="switch design", title="Switch the page design, temporary.",
+    )
+
+    return "\n".join(output)
+
+
+@check_permissions(superuser_only=False, permissions=("pylucid.change_design",))
+@render_to("design/switch.html")
+def switch(request):
+    """
+    'switch' the design.
+    Save design ID in request.session["design_switch_pk"]
+    This value would be used in design.signal_reveiver
+    """
+    context = {
+        "title": _("Switch a PyLucid page design"),
+        "form_url": request.path,
+    }
+
+    if "design_switch_pk" in request.session:
+        design_id = request.session["design_switch_pk"]
+        try:
+            context["design_switch"] = Design.on_site.get(id=design_id)
+        except Design.DoesNotExist, err:
+            request.page_msg.error(_(
+                    "Error: Design with ID %(id)r doesn't exist: %(err)s"
+                ) % {"id":design_id, "err": err}
+                )
+            del request.session["design_switch_pk"]
+            design_id = 0
+    else:
+        design_id = 0
+
+    if request.method == "POST":
+        form = SelectDesign(request.POST)
+        if form.is_valid():
+            design_id = int(form.cleaned_data["design"])
+            if design_id == 0:
+                # reset to automatic selection by pagetree association
+                if "design_switch_pk" in request.session:
+                    del request.session["design_switch_pk"]
+                request.page_msg(
+                    _("delete 'design switch', turn to automatic mode.")
+                )
+            else:
+                request.page_msg(_("Save design ID %r") % design_id)
+                request.session["design_switch_pk"] = design_id
+            return http.HttpResponseRedirect(request.path)
+    else:
+        form = SelectDesign(initial={"design": design_id})
+
+    context["form"] = form
+    return context
+

pylucid_project/pylucid_plugins/design/forms.py

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+# coding:utf-8
+
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+
+from pylucid_project.apps.pylucid.models import Design
+
+
+class SelectDesign(forms.Form):
+    design = forms.ChoiceField(
+        # choices= Set in __init__, so the Queryset would not execute at startup
+        required=False, initial=None,
+        help_text=_("Select the PyLucid page design")
+    )
+
+    def __init__(self, *args, **kwargs):
+        super(SelectDesign, self).__init__(*args, **kwargs)
+        designs = Design.on_site.all().values_list("id", "name")
+        self.fields["design"].choices = [(0, "<automatic>")] + list(designs)

pylucid_project/pylucid_plugins/design/signal_receiver.py

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+# coding: utf-8
+
+"""
+    PyLucid design plugin
+    ~~~~~~~~~~~~~~~~~~~~~
+
+    signal receiver, connected in design.__init__.py
+
+    switch design, if "design_switch_pk" in request.session
+
+    :copyleft: 2010 by the PyLucid team, see AUTHORS for more details.
+    :license: GNU GPL v3 or above, see LICENSE for more details
+"""
+
+from django.conf import settings
+from django.utils.safestring import mark_safe
+from django.utils.translation import ugettext as _
+from django.template.loader import render_to_string
+
+
+def pre_render_global_template_handler(**kwargs):
+    """
+    Handle the 'pre_render_global_template' signal.
+    """
+    request = kwargs["request"]
+    if "design_switch_pk" not in request.session:
+        # The user has not switch the design
+        return
+
+    from pylucid_project.apps.pylucid.models import Design # import here, agains import loops
+
+    pagetree = request.PYLUCID.pagetree
+    print "old design:", pagetree.design
+
+    design_id = request.session["design_switch_pk"]
+    pagetree.design = Design.on_site.get(id=design_id)
+
+    print "use design:", pagetree.design

pylucid_project/pylucid_plugins/design/templates/design/switch.html

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+{% extends "admin/base_site.html" %}
+
+{% block content %}
+
+{% if design_switch %}
+<p>
+	The current page design is switched to: <strong>{{ design_switch }}</strong>.<br/>
+	You will see all cms pages in this design.
+</p>
+{% else %}
+<p>
+	No 'design switch' active.<br/>
+	You will see all cms pages in the design associated by the PageTree.
+</p>
+{% endif %}
+
+<form action="{{ form_url }}" method="post" id="find_and_replace_form" class="pylucid_form">
+    {% include "admin/pylucid/includes/form_fieldset_errorlist.html" %}
+    {% include "admin/pylucid/includes/markup_preview_fieldset.html" %}
+    <fieldset>
+        {% include "admin/pylucid/includes/pylucid_formset.html" %}
+        <div class="helper_buttons">
+            <input type="submit" name="save" value="{% trans 'switch design' %}" />      
+        </div>
+    </fieldset>
+</form>
+{% endblock %}