def render(self, block, view_name, context=None):
"""
Render a block by invoking its view.
Finds the view named `view_name` on `block`. The default view will be
used if a specific view hasn't be registered. If there is no default
view, an exception will be raised.
The view is invoked, passing it `context`. The value returned by the
view is returned, with possible modifications by the runtime to
integrate it into a larger whole.
"""
# Set the active view so that :function:`render_child` can use it
# as a default
old_view_name = self._view_name
self._view_name = view_name
try:
view_fn = getattr(block, view_name, None)
if view_fn is None:
view_fn = getattr(block, "fallback_view", None)
if view_fn is None:
raise NoSuchViewError()
view_fn = functools.partial(view_fn, view_name)
frag = view_fn(context)
# Explicitly save because render action may have changed state
block.save()
return self.wrap_child(block, view_name, frag, context)
finally:
# Reset the active view to what it was before entering this method
self._view_name = old_view_name
def render_sequense_child_context(self, block, view_name, context=None):
"""
:param block: object
:param view_name: string
:param context: dict
:return: dict
"""
context = context or {}
if view_name in PREVIEW_VIEWS:
block = self._get_student_block(block)
vertical_block = VerticalBlockContext(block)
view_fn = getattr(vertical_block, view_name, None)
if view_fn is None:
raise NoSuchViewError(vertical_block, view_name)
frag = view_fn(vertical_block._verticalBlock, context)
return frag
def render_component_context(self, component, view_name, context=None):
"""
:param component: object
:param view_name: string
:param context: dict
:return: dict
"""
context = context or {}
if view_name in PREVIEW_VIEWS:
block = self._get_student_block(component)
component_module = ComponentModuleConext(component)
view_fn = getattr(component_module, view_name, None)
if view_fn is None:
raise NoSuchViewError(component_module, view_name)
frag = view_fn(component_module._component._xmodule, context)
return frag
def render_sequense_context(self, block, view_name, context=None):
"""
:param block: object
:param view_name: string
:param context: dict
:return: dict
"""
context = context or {}
if view_name in PREVIEW_VIEWS:
block = self._get_student_block(block)
sequence_module = SequenceModuleContext(block)
view_fn = getattr(sequence_module, view_name, None)
if view_fn is None:
raise NoSuchViewError(sequence_module, view_name)
frag = view_fn(sequence_module._sequenceModule, context)
return frag