#!/usr/bin/python2.5

#

# Copyright 2008 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#   http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Custom widgets used for form fields.

"""

__authors__ = [

  '"Pawel Solyga" <pawel.solyga@gmail.com>',

  ]

import copy

from django import forms

from django.forms import util

from django.forms import widgets

from django.utils import html

from django.utils import simplejson

from django.utils import safestring

class ReadOnlyInput(forms.widgets.Input):

  """Read only input widget.

  """

  input_type = 'text'

  def render(self, name, value, attrs=None):

    """Render ReadOnlyInput widget as HTML.

    """

    attrs['readonly'] = 'readonly'

    attrs['class'] = 'plaintext'

    return super(ReadOnlyInput, self).render(name, value, attrs)

class TinyMCE(forms.widgets.Textarea):

  """TinyMCE widget. 

  Requires to include tiny_mce_src.js in your template. Widget can be

  customized by overwriting or adding extra options to mce_settings

  dictionary

  You can set TinyMCE widget for particular form field using code below:

    class ExampleForm(helper.forms.BaseForm):

      content = forms.fields.CharField(widget=helper.widgets.TinyMCE())

  You can include tiny_mce_src.js in your template using:

    {% block scripts %}

  	  <script type="text/javascript" src="/tiny_mce/tiny_mce_src.js"></script>

    {% endblock %}

  """ 

  DEF_MCE_SETTINGS = {'mode': "exact",

                      'theme_advanced_toolbar_location': "top",

  TINY_MCE_HTML_FMT = u'''\

<textarea %(attrs)s>%(value)s</textarea>

<script type="text/javascript">

tinyMCE.init(%(settings_json)s)

</script>'''

  def __init__(self, mce_settings=None, *args, **kwargs):

    """Initialize TinyMCE widget with default or customized settings.

    Args:

      mce_settings: dict with TinyMCE widget settings

      *args, **kwargs:  passed through to parent __init__() constructor

    """

    super(forms.widgets.Textarea, self).__init__(*args, **kwargs)

    # copy the class defaults to an instance data member

    self.mce_settings = copy.deepcopy(self.DEF_MCE_SETTINGS)

    if mce_settings:

      # modify the per-instance settings if called supplied customizations

      self.mce_settings.update(mce_settings)

  def render(self, name, value, attrs=None):

    """Render TinyMCE widget as HTML.

    """

    if value is None:

      value = ''

    value = util.smart_unicode(value)

    final_attrs = self.build_attrs(attrs, name=name)

    self.mce_settings['elements'] = "id_%s" % name

    # convert mce_settings from dict to JSON

    mce_json = simplejson.JSONEncoder().encode(self.mce_settings)

    return safestring.mark_safe(self.TINY_MCE_HTML_FMT % 

        {'attrs': widgets.flatatt(final_attrs),

         'value': html.escape(value), 

         'settings_json':  mce_json})

class ReferenceField(forms.CharField):

  """Widget for selecting a reference to an Entity.

  """

  def __init__(self, reference_url, filter=None,

               *args, **kwargs):

    """Initializes the widget with the specified url and filter.

    """

    self.rf = {}

    self.rf['reference_url'] = reference_url

    self.rf['filter'] = filter if filter else []

    super(ReferenceField, self).__init__(*args, **kwargs)