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"""
Tree editor for hierarchal data
Demonstrates using the TreeEditor to display a hierarchically organized data
structure.
In this case, the tree has the following hierarchy:
- Partner
- Company
- Department
- Employee
The TreeEditor generates a hierarchical tree control, consisting of nodes. It is
useful for cases where objects contain lists of other objects.
The tree control is displayed in one pane of the editor, and a user interface
for the selected object is displayed in the other pane. The layout orientation
of the tree and the object editor is determined by the *orientation* parameter
of TreeEditor(), which can be 'horizontal' or 'vertical'.
You must specify the types of nodes that can appear in the tree using the
*nodes* parameter, which must be a list of instances of TreeNode (or of
subclasses of TreeNode).
You must specify the classes whose instances the node type applies to. Use the
**node_for** attribute of TreeNode to specify a list of classes; often, this
list contains only one class. You can have more than one node type that applies
to a particular class; in this case, each object of that class is represented by
multiple nodes, one for each applicable node type.
See the Traits User Manual for more details.
"""
# FIXME: provide accessible copy or equivalent of factories_advanced_extra.rst
from traits.api import HasTraits, Str, Regex, List, Instance
from traitsui.api import Item, View, TreeEditor, TreeNode
class Employee(HasTraits):
""" Defines a company employee. """
name = Str('<unknown>')
title = Str
phone = Regex(regex = r'\d\d\d-\d\d\d\d')
def default_title(self):
self.title = 'Senior Engineer'
class Department(HasTraits):
""" Defines a department with employees. """
name = Str('<unknown>')
employees = List(Employee)
class Company(HasTraits):
""" Defines a company with departments and employees. """
name = Str('<unknown>')
departments = List(Department)
employees = List(Employee)
# Create an empty view for objects that have no data to display:
no_view = View()
# Define the TreeEditor used to display the hierarchy:
tree_editor = TreeEditor(
nodes = [
# The first node specified is the top level one
TreeNode(node_for = [ Company ],
auto_open = True,
# child nodes are
children = '',
label = 'name', # label with Company name
view = View([ 'name' ])
),
TreeNode(node_for = [ Company ],
auto_open = True,
children = 'departments',
label = '=Departments', # constant label
view = no_view,
add = [ Department ],
),
TreeNode(node_for = [ Company ],
auto_open = True,
children = 'employees',
label = '=Employees', # constant label
view = no_view,
add = [ Employee ]
),
TreeNode(node_for = [ Department ],
auto_open = True,
children = 'employees',
label = 'name', # label with Department name
view = View([ 'name' ]),
add = [ Employee ]
),
TreeNode(node_for = [ Employee ],
auto_open = True,
label = 'name', # label with Employee name
view = View([ 'name', 'title', 'phone' ])
)
]
)
class Partner(HasTraits):
""" Defines a business partner."""
name = Str('<unknown>')
company = Instance(Company)
view = View(
Item(name = 'company',
editor = tree_editor,
show_label = False
),
title = 'Company Structure',
buttons = [ 'OK' ],
resizable = True,
style = 'custom',
width = .3,
height = 500
)
# Create an example data structure:
jason = Employee(name = 'Jason',
title = 'Senior Engineer',
phone = '536-1057')
mike = Employee(name = 'Mike',
title = 'Senior Engineer',
phone = '536-1057')
dave = Employee(name = 'Dave',
title = 'Senior Software Developer',
phone = '536-1057')
martin = Employee(name = 'Martin',
title = 'Senior Engineer',
phone = '536-1057')
duncan = Employee(name = 'Duncan',
title = 'Consultant',
phone = '526-1057')
# Create the demo:
demo = Partner(
name = 'Enthought, Inc.',
company = Company(
name = 'Enthought',
employees = [ dave, martin, duncan, jason, mike ],
departments = [
Department(
name = 'Business',
employees = [ jason, mike ]
),
Department(
name = 'Scientific',
employees = [ dave, martin, duncan ]
)
]
)
)
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
demo.configure_traits()
|
