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# Author: Ilan Schnell <ischnell@enthought.com>
# Copyright (c) 2008, Enthought, Inc.
# License: BSD Style.
from traits.api import HasTraits, Str, Int, Array, List, \
Instance, on_trait_change, Property, Button
from pyface.api import GUI
from traitsui.api import View, Item, HGroup, Group, \
ListEditor, TabularEditor, spring, TextEditor, Controller, VSplit
from traitsui.tabular_adapter import TabularAdapter
from mayavi.tools.data_wizards.csv_sniff import Sniff, loadtxt, \
array2dict
##############################################################################
# ListItem class
##############################################################################
class ListItem(HasTraits):
""" Class used to represent an item in a list with traits UI.
"""
column_number = Int
name = Str
my_name = Str
parent = Instance(HasTraits)
view = View(
HGroup(
Item('name', style='readonly', show_label=False,
resizable=False),
Item('my_name', style='simple', show_label=False,
editor=TextEditor(auto_set=False, enter_set=True),
springy=True),
)
)
##############################################################################
# CSVLoader class
##############################################################################
class CSVLoader(HasTraits):
""" User interface to load CSV files.
"""
# The name of the file being loaded.
filename = Str
# The comment characters
comments = Str(desc="The comment characters")
# The character giving the delimiter between the columns.
delimiter = Str(
desc="The character giving the delimiter between the columns")
# The number of rows to skip at the beginning of the file
skiprows = Int(
desc="The number of rows to skip at the beginning of the file")
columns = List(ListItem)
data = Array
data_dict = Property(depends_on='data')
def _get_data_dict(self):
return array2dict(self.data)
def guess_defaults(self):
try:
kwds = Sniff(self.filename).kwds()
except:
kwds = {'comments': '#',
'delimiter': ',',
'dtype': float,
'skiprows': 0}
if kwds['delimiter']:
self.delimiter = kwds['delimiter']
else:
self.delimiter = ' '
self.comments = kwds['comments']
self.skiprows = kwds['skiprows']
self.names = list(kwds['dtype']['names'])
self.formats = list(kwds['dtype']['formats'])
self.columns = [ListItem(name='Column %i:' % (i + 1),
parent=self,
column_number=i,
my_name=val)
for i, val in enumerate(self.names)]
self.load_data()
def load_data(self):
kwds = {}
kwds['delimiter'] = self.delimiter
kwds['comments'] = self.comments
kwds['skiprows'] = self.skiprows
kwds['dtype'] = dict(names=self.names,
formats=self.formats)
try:
self.data = loadtxt(self.filename, **kwds)
except:
pass
##############################################################################
# CSVLoaderController class
##############################################################################
class CSVLoaderController(Controller):
""" A controller for the CSVLoader.
"""
tabular_editor = Instance(HasTraits)
def _tabular_editor_default(self):
class ArrayAdapter(TabularAdapter):
columns = [(n, i) for i, n in enumerate(self.model.names)]
font = 'Courier 10'
alignment = 'right'
format = '%s'
return TabularEditor(adapter=ArrayAdapter())
update_preview = Button('Update preview')
@on_trait_change('update_preview')
def load_data(self):
self.model.load_data()
@on_trait_change('model.columns.my_name,model.data')
def update_table_editor(self, object, name, old, new):
if isinstance(object, ListItem):
self.tabular_editor.adapter.columns[object.column_number] = \
(new, object.column_number)
GUI.set_trait_later(self.info.ui, 'updated', True)
file_content = Str
@on_trait_change('model.filename')
def update_file(self):
f = open(self.model.filename)
self.file_content = f.read(300)
def default_traits_view(self):
view = View(
VSplit(
HGroup(
Group(
spring,
Item('delimiter',
label='Column delimiter character'),
Item('comments',
label='Comment character'),
Item('skiprows',
label='Number of lines to skip at the '
'beginning of the file'),
spring,
Item('handler.update_preview',
show_label=False),
),
Group(
Item('columns',
show_label=False,
style='readonly',
editor=ListEditor(style='custom'),
springy=True,
),
label="Column names",
show_border=True,
),
),
Group(
Group(
Item('data',
show_label=False,
editor=self.tabular_editor,
),
label="Preview table",
),
Group(
Item('handler.file_content', style='readonly',
show_label=False,
springy=True),
label="%s" % self.model.filename,
),
layout='tab'),
),
buttons=['OK', 'Cancel', 'Help'],
id='csv_load_editor',
resizable=True,
width=640,
height=580,
title='CSV import - [%s]' % self.model.filename
)
return view
if __name__ == '__main__':
from pyface.api import GUI
csv_loader = CSVLoader(filename='mydata.csv')
csv_loader.guess_defaults()
controller = CSVLoaderController(model=csv_loader)
controller.edit_traits()
GUI().start_event_loop()
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