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form.py
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form.py
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# -*- coding: utf-8 -*-
import sys
import os
from os.path import join, dirname
from cgi import FieldStorage
from wtforms import Form
from wtforms.ext.appengine.db import model_form
from wtforms.widgets import html_params, HTMLString
from wtforms.fields import Field, _unset_value
from mako.template import Template
from google.appengine.ext import db
from google.appengine.api import memcache
from data import world, Country, Brewery, Beer
__all__ = ( "CountryForm", "BreweryForm", "BeerForm" )
class ImageWidget(object):
"""
Very simple image selection widget
"""
def __call__(self, field, **kwargs):
kwargs.setdefault("id", field.id)
name = "%s.png" % field.name
url = kwargs.get("url", "%s/%s" % (kwargs.get("path"), name))
kwargs.setdefault("value", name)
preview = HTMLString(u"<img %s />" % html_params(name="preview_"+name,
src=url))
inputButton = HTMLString(u"<input %s />" % html_params(name=field.name,
type=u"file",
**kwargs))
return preview + inputButton
class ImageField(Field):
widget = ImageWidget()
def process_formdata(self, valuelist):
if valuelist:
if isinstance(valuelist[0], FieldStorage):
data = valuelist[0].value
else:
data = valuelist[0]
if data:
self.data = db.Blob(data)
# NB If we reset on no data then a image must always be rechosen
# so we don't do that
def _value(self):
return self.name + ".png"
class ImagePreviewWidget(object):
"""
Super dynamic image selection widget, implemented as a Mako template
"""
def __call__(self, field, **kwargs):
kwargs.setdefault("path", "")
template = Template(filename=join(dirname(__file__),
"templates",
"preview.html"))
return template.get_def("image").render(field=field, **kwargs)
class ImagePreviewField(ImageField):
widget = ImagePreviewWidget()
def process(self, formdata, data=_unset_value):
self.process_errors = []
if data is _unset_value:
try:
data = self.default()
except TypeError:
data = self.default
try:
self.process_data(data)
except ValueError, e:
self.process_errors.append(e.args[0])
if formdata:
try:
self.raw_data = self._getRawData(formdata)
self.process_formdata(self.raw_data)
except ValueError, e:
self.process_errors.append(e.args[0])
for filter in self.filters:
try:
self.data = filter(self.data)
except ValueError, e:
self.process_errors.append(e.args[0])
def _getRawData(self, formdata):
if not self.name in formdata:
return []
rawData = formdata.getlist(self.name)
if rawData and rawData[0] != u'':
return rawData
return self._getRawPreviewData(formdata)
def _getRawPreviewData(self, formdata):
previewName = "%sPreview" % self.name
if not previewName in formdata:
return []
previewData = formdata.getlist(previewName)
if not previewData:
return []
previewId = previewData[0]
if not previewId:
return []
# TODO validation?
image = memcache.get(previewId, namespace="ImagePreview")
if not image:
return []
return [ image ]
class WobForm(Form):
"""WobForm allows me to extend the wtforms.Form"""
# I'm sure there's more clever ways to do this, but this works
@classmethod
def hasImageField(cls, name):
fieldClass = getattr(getattr(cls, name, object), 'field_class', None)
return issubclass(fieldClass, ImageField)
ModelCountryForm = model_form(Country, WobForm,
field_args =
{
"perCapBeer": { "label": "Beer consumed per capita" },
"totBeer": { "label": "Total beer consumption" },
})
class CountryForm(ModelCountryForm):
flag = ImagePreviewField(**ModelCountryForm.flag.kwargs)
map = ImagePreviewField(**ModelCountryForm.map.kwargs)
ModelBreweryForm = model_form(Brewery, WobForm)
class BreweryForm(ModelBreweryForm):
logo = ImagePreviewField(**ModelBreweryForm.logo.kwargs)
ModelBeerForm = model_form(Beer, WobForm)
class BeerForm(ModelBeerForm):
picture = ImagePreviewField(**ModelBeerForm.picture.kwargs)