Source code for pyface.viewer.tree_content_provider

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""" Abstract base class for tree content providers. """


from .content_provider import ContentProvider


[docs]class TreeContentProvider(ContentProvider): """ Abstract base class for tree content providers. Tree content providers are used by (surprise, surprise) tree viewers! """ # ------------------------------------------------------------------------ # 'ContentProvider' interface. # ------------------------------------------------------------------------
[docs] def get_elements(self, element): """ Returns a list of the elements to display in a viewer. Returns a list of elements to display in a viewer when its (ie. the viewer's) input is set to the given element. The returned list should not be modified by the viewer. """ return self.get_children(element)
# ------------------------------------------------------------------------ # 'TreeContentProvider' interface. # ------------------------------------------------------------------------
[docs] def get_parent(self, element): """ Returns the parent of an element. Returns None if the element either has no parent (ie. it is the root of the tree), or if the parent cannot be computed. """ return None
[docs] def get_children(self, element): """ Returns the children of an element. """ raise NotImplementedError()
[docs] def has_children(self, element): """ Returns True iff the element has children, otherwise False. """ raise NotImplementedError()