[CMF-checkins] SVN: CMF/branches/tseaver-viewification/CMFDefault/browser/ - added utils for batch navigation

Tue Jan 31 13:09:45 EST 2006

Log message for revision 41518:
  - added utils for batch navigation

Changed:
  U   CMF/branches/tseaver-viewification/CMFDefault/browser/configure.zcml
  A   CMF/branches/tseaver-viewification/CMFDefault/browser/templates/batch_widgets.pt
  U   CMF/branches/tseaver-viewification/CMFDefault/browser/utils.py

-=-
Modified: CMF/branches/tseaver-viewification/CMFDefault/browser/configure.zcml
===================================================================

--- CMF/branches/tseaver-viewification/CMFDefault/browser/configure.zcml	2006-01-31 18:00:39 UTC (rev 41517)
+++ CMF/branches/tseaver-viewification/CMFDefault/browser/configure.zcml	2006-01-31 18:09:45 UTC (rev 41518)
@@ -74,4 +74,12 @@
       layer="cmf"
       />
 
+  <browser:page
+      for="*"
+      name="batch_widget"
+      template="templates/batch_widgets.pt"
+      permission="zope2.View"
+      layer="cmf"
+      />
+
 </configure>

Added: CMF/branches/tseaver-viewification/CMFDefault/browser/templates/batch_widgets.pt
===================================================================
--- CMF/branches/tseaver-viewification/CMFDefault/browser/templates/batch_widgets.pt	2006-01-31 18:00:39 UTC (rev 41517)
+++ CMF/branches/tseaver-viewification/CMFDefault/browser/templates/batch_widgets.pt	2006-01-31 18:09:45 UTC (rev 41518)
@@ -0,0 +1,22 @@
+<html>
+<body>
+
+ <metal:macro metal:define-macro="navigation"
+    tal:define="prev_info view/navigation_previous;
+                next_info view/navigation_next"
+ ><p class="BatchNavigation" tal:condition="python: prev_info or next_info"
+  ><tal:case tal:condition="prev_info">
+  <a href="" tal:attributes="href prev_info/url"
+     tal:content="prev_info/title"
+     i18n:translate="">PREVIOUS N ITEMS</a></tal:case
+ ><tal:case tal:condition="python: prev_info and next_info">
+  &nbsp;&nbsp;</tal:case
+ ><tal:case tal:condition="next_info">
+  <a href="" tal:attributes="href next_info/url"
+     tal:content="next_info/title"
+     i18n:translate="">NEXT N ITEMS</a></tal:case
+ ></p
+></metal:macro>
+
+</body>
+</html>

Modified: CMF/branches/tseaver-viewification/CMFDefault/browser/utils.py
===================================================================
--- CMF/branches/tseaver-viewification/CMFDefault/browser/utils.py	2006-01-31 18:00:39 UTC (rev 41517)
+++ CMF/branches/tseaver-viewification/CMFDefault/browser/utils.py	2006-01-31 18:09:45 UTC (rev 41518)
@@ -15,6 +15,7 @@
 $Id$
 """
 
+from ZTUtils import Batch
 from ZTUtils import make_query
 
 from Products.CMFCore.utils import getToolByName
@@ -159,3 +160,63 @@
         vars = [ {'name': name, 'value': value}
                  for name, value in html_marshal(**kw) ]
         return tuple(vars)
+
+
+class BatchViewBase(ViewBase):
+
+    # helpers
+
+    _BATCH_SIZE = 25
+
+    @memoize
+    def _getBatchStart(self):
+        return self.request.form.get('b_start', 0)
+
+    @memoize
+    def _getBatchObj(self):
+        b_start = self._getBatchStart()
+        items = self._getItems()
+        return Batch(items, self._BATCH_SIZE, b_start, orphan=0)
+
+    @memoize
+    def _getNavigationURL(self, b_start):
+        target = self._getViewURL()
+        kw = self._getHiddenVars()
+
+        kw['b_start'] = b_start
+        for k, v in kw.items():
+            if not v or k == 'portal_status_message':
+                del kw[k]
+
+        query = kw and ('?%s' % make_query(kw)) or ''
+        return u'%s%s' % (target, query)
+
+    # interface
+
+    @memoize
+    def navigation_previous(self):
+        batch_obj = self._getBatchObj().previous
+        if batch_obj is None:
+            return None
+
+        length = len(batch_obj)
+        url = self._getNavigationURL(batch_obj.first)
+        if length == 1:
+            title = _(u'Previous item')
+        else:
+            title = _(u'Previous ${count} items', mapping={'count': length})
+        return {'title': title, 'url': url}
+
+    @memoize
+    def navigation_next(self):
+        batch_obj = self._getBatchObj().next
+        if batch_obj is None:
+            return None
+
+        length = len(batch_obj)
+        url = self._getNavigationURL(batch_obj.first)
+        if length == 1:
+            title = _(u'Next item')
+        else:
+            title = _(u'Next ${count} items', mapping={'count': length})
+        return {'title': title, 'url': url}

