provide RendererFactory class that allows transparent dynamic retrieval of macros

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2905 fd906abe-77d9-0310-91a1-e0d9ade77398

browser/renderer.py

@@ -0,0 +1,46 @@
+#
+#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 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 General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+"""
+Use ZPT macros as layout renderers.
+
+$Id$
+"""
+
+
+class RendererFactory(object):
+    """ Provider for ZPT macros.
+    """
+
+    def __init__(self, template):
+        self.template = template
+
+    def get(self, key, default=None):
+        return self.template.macros.get(key, default)
+
+    def __getitem__(self, key):
+        return self.template.macros[key]
+
+    def __getattr__(self, key):
+        """ Convenience method for retrieving callable renderer for layout.
+        """
+        return lambda key=key: self[key]
+
+    def __repr__(self):
+        return ('<RendererFactory, template=%r, macros=%r>' %
+                    (self.template, self.template.macros.keys()))

composer/layout/browser/base.pt

@@ -1 +1 @@
-<metal:render use-macro="nocall:view/renderer" />
+<metal:render use-macro="view/renderer" />

composer/layout/browser/default.py

@@ -24,28 +24,29 @@ $Id$
 
 from zope.app.pagetemplate import ViewPageTemplateFile
 
+from cybertools.browser.renderer import RendererFactory
 from cybertools.composer.layout.base import Layout
 from cybertools.composer.layout.browser.standard import standardRenderers
 
 
-defaultRenderers = ViewPageTemplateFile('default.pt').macros
+defaultRenderers = RendererFactory(ViewPageTemplateFile('default.pt'))
 
 
 page = Layout('page', 'page', renderer=standardRenderers['page'],
               sublayouts=set(['css.liquid', 'body.liquid']))
 
-logo = Layout('logo.default', 'body.logo', renderer=defaultRenderers['logo'])
+logo = Layout('logo.default', 'body.logo', renderer=defaultRenderers.logo)
 
 top_actions = Layout('top_actions.default', 'body.top_actions',
-                     renderer=defaultRenderers['top_actions'])
+                     renderer=defaultRenderers.top_actions)
 
 column1 = Layout('column1.default', 'body.column1',
-                 renderer=defaultRenderers['column1'])
+                 renderer=defaultRenderers.column1)
 
 content = Layout('content.default', 'body.content',
-                 renderer=defaultRenderers['content'])
+                 renderer=defaultRenderers.content)
 
 column2 = Layout('column2.default', 'body.column2',
-                 renderer=defaultRenderers['column2'])
+                 renderer=defaultRenderers.column2)
 
-footer = Layout('footer.default', 'body.footer', renderer=defaultRenderers['footer'])
+footer = Layout('footer.default', 'body.footer', renderer=defaultRenderers.footer)

composer/layout/browser/liquid/default.py

@@ -28,15 +28,16 @@ from zope import component
 from zope.interface import implements
 
 from cybertools.browser.liquid import Liquid
+from cybertools.browser.renderer import RendererFactory
 from cybertools.composer.layout.base import Layout
 from cybertools.composer.layout.browser.standard import standardRenderers
 
-defaultRenderers = ViewPageTemplateFile('default.pt').macros
+defaultRenderers = RendererFactory(ViewPageTemplateFile('default.pt'))
 
 
 css = Layout('css.liquid', 'page.css', renderer=standardRenderers['css'],
              media='all', resource='liquid.css', skin=Liquid)
 
-body = Layout('body.liquid', 'page.body', renderer=defaultRenderers['body'],
+body = Layout('body.liquid', 'page.body', renderer=defaultRenderers.body,
               skin=Liquid)
 

composer/layout/browser/standard.py

@@ -24,8 +24,9 @@ $Id$
 
 from zope.app.pagetemplate import ViewPageTemplateFile
 
+from cybertools.browser.renderer import RendererFactory
 from cybertools.composer.layout.base import Layout
 
 
-standardRenderers = ViewPageTemplateFile('standard.pt').macros
+standardRenderers = RendererFactory(ViewPageTemplateFile('standard.pt'))