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from .utils import is_dunder
class VirtualNodeManager:
"""VirtualNodeManager acts as a container for VirtualNode
It allows widgets to be passed around that are not yet defined,
and can be defined or re-defined later. For example:
>>> with layout:
... ui.hello_widget(layout) # widget is currently undefined
>>> with ui.hello_widget:
... html.Div("Hello")
"""
def __init__(self, server, vn_constructor=None):
super().__setattr__("_server", server)
super().__setattr__("_vn_dict", {})
super().__setattr__("_vn_constructor", vn_constructor)
def __getitem__(self, name):
return self.__getattr__(name)
def __getattr__(self, name):
if is_dunder(name):
return super().__getattr__(name)
if name not in self._vn_dict:
self._vn_dict[name] = self._vn_constructor(trame_server=self._server)
return self._vn_dict[name]
def set_vn_constructor(self, constructor):
"""Should not be called by user"""
self._vn_constructor = constructor
def clear_layouts(self):
"""
Remove any reference to previously registered layouts
across all VirutalNodes.
"""
for vn in self._vn_dict.values():
vn.clear_layouts()
def flush_content(self):
"""Push all VirtualNode contents to registered layouts"""
for vn in self._vn_dict.values():
vn.flush_content()
def clear(self):
"""Clear all VirtualNode contents"""
for vn in self._vn_dict.values():
vn.clear()
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