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##############################################################################
#
# Copyright (c) 2003-2006 Nexedi SARL and Contributors. All Rights Reserved.
# Sebastien Robin <seb@nexedi.com>
# Jean-Paul Smets <jp@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
##############################################################################
from Products.Formulator import Widget
from Products.Formulator import Widget, Validator
from Products.Formulator.DummyField import fields
from Products.Formulator.Field import ZMIField
from Selection import Selection
from Products.PythonScripts.PythonScript import PythonScript
try:
import pychart
except ImportError:
pychart = None
from zLOG import LOG
class ZPyChartWidget(Widget.Widget):
"""
A widget to generate pychart charts in multiple formats
Chart definition is defined in a script. Some parameters
are defined through Web UI. Web UI parameters are intended
to be specialised through Proxy fields.
"""
property_names = Widget.Widget.property_names+\
[ 'selection_name',
'data_method',
'chart_title',
'x_title',
'y_title',]
default = fields.StringField('default',
title='Default',
description=(
"Default value of the text in the widget."),
default="",
required=0)
selection_name = fields.StringField('selection_name',
title='Selection Name',
description=('The name of the selection to store'
'params of selection'),
default='',
required=0)
data_method = fields.StringField('data_method',
title='Data Method',
description=('The method wich returns data'),
default='',
required=0)
chart_title = fields.StringField('chart_title',
title='Chart Title',
description=('The Title on the top of the chart'),
default='',
required=0)
x_title = fields.StringField('x_title',
title='X Title',
description=('The Title for the X axis'),
default='',
required=0)
y_title = fields.StringField('y_title',
title='Y Title',
description=('The Title for the Y axis'),
default='',
required=0)
def render(self, field, key, value, REQUEST, render_prefix=None):
"""
Here, we just generate tags which will later call download
"""
# Get standard parameters
selection_name = field.get_value('selection_name')
chart_title = field.get_value('chart_title')
data_method = field.get_value('data_method')
x_title = field.get_value('x_title')
y_title = field.get_value('y_title')
# Retrieve the data and set the selection if data_method is not None
if data_method:
here = REQUEST.get('here', self)
if getattr(here, data_method, None) is not None:
data_method = getattr(here, data_method)
# Retrieve selection
selection = here.portal_selections.getSelectionFor(selection_name, REQUEST=REQUEST)
# Define the new selection data_method
selection.edit(method_id = data_method) # XXX This is probably wrong
# Return an image field
return """<img src="%s/download?selection_name=%s&chart_title=%s&data_method=%s&x_title=%s&y_title=%s"/>""" % (field.absolute_url(), selection_name, chart_title, data_method, x_title, y_title)
ZPyChartWidgetInstance = ZPyChartWidget()
class ZPyChartValidator(Validator.Validator):
property_names = Validator.Validator.property_names
def validate(self, field, key, REQUEST):
result = {}
return result
ZPyChartValidatorInstance = ZPyChartValidator()
class ZPyChart(ZMIField, PythonScript):
"""
A hybrid between a field and a script
TODO:
- implement XML I/O of script
- make tabs nicer
"""
meta_type = "ZPyChart"
manage_options = ZMIField.manage_options + PythonScript.manage_options
widget = ZPyChartWidgetInstance
validator = ZPyChartValidatorInstance
def __init__(self, id, **kw):
ZMIField.__init__(self, id, **kw)
PythonScript.__init__(self, id)
def download(self, selection_name=None, data_method=None, REQUEST=None, **kw):
"""
This is where we actually render the chart. The main interest
of doing like this is to accelerate initial rendering
TODO:
- add minimal security here
- implement all pychart options (PNG, PS, SVG, etc.)
- implement all standard parameters
"""
# Get the applicable selection
selection = self.portal_selections.getSelectionFor(selection_name, REQUEST=REQUEST)
# If selection is None, create a new one
if selection is None:
selection = Selection(selection_name)
# Get the data method if defined
if data_method is not None:
here = REQUEST.get('here', self)
data_method = getattr(here, data_method, None)
# This is the default data, this is just in the case there is not method given
if data_method is None:
data = selection()
else:
data = selection(data_method=data_method)
# Now call the script - XXX implement bindings properly here
output = self._exec(here=self, pychart=pychart, data=data)
# And return result
return output