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= The macro: TALES namespace =
Launchpad has a 'macro:' TALES namespace that offers controls over the
layout of the page.
>>> from canonical.launchpad.webapp.servers import LaunchpadTestRequest
>>> class FakeView(object):
... request = LaunchpadTestRequest()
Templates should start by specifying the kind of pagetype they use.
That's done by using the 'macro:page' traversal. That expression returns
the master macro from the main_template.pt and sets on the view the
layout it's using. The following METAL fragment illustrates the way it's
usually done:
<html metal:use-macro="view/macro:page/main_side" />
>>> from lp.testing import test_tales
>>> view = FakeView()
# Return value is the compiled macro expression.
>>> test_tales('view/macro:page/main_side', view=view)
[('version', ...]
The pagetype is registered in the __pagetype__ attribute.
>>> view.__pagetype__
'main_side'
If the pagetype isn't defined, a LocationError is raised.
>>> test_tales('view/macro:page/not-defined', view=FakeView())
Traceback (most recent call last):
...
LocationError: 'unknown pagetype: not-defined'
The 'macro:pagehas' can then be used to test for features that should be
rendered in the layout.
>>> test_tales('view/macro:pagehas/applicationtabs', view=view)
True
>>> test_tales('view/macro:pagehas/portlets', view=view)
True
The 'macro:isbetauser' can be used to safely try to determine if the
current user is a beta user. It works for views that provide
isBetaUser() (ie. all views inheriting LaunchpadView), and simply
returns False for older views that do not.
>>> class LPView(object):
... request = LaunchpadTestRequest()
... def isBetaUser(self):
... return True
>>> test_tales('view/macro:isbetauser', view=LPView())
True
>>> test_tales('view/macro:isbetauser', view=view)
False
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