web/formwidgets.py
author sylvain.thenault@logilab.fr
Tue, 12 May 2009 17:39:45 +0200
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"""widget classes for form construction
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:organization: Logilab
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:copyright: 2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from datetime import date
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from cubicweb.common import tags
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from cubicweb.web import stdmsgs, INTERNAL_FIELD_VALUE
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class FieldWidget(object):
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    """abstract widget class"""
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    # javascript / css files required by the widget
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    needs_js = ()
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    needs_css = ()
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    # automatically set id and tabindex attributes ?
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    setdomid = True
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    settabindex = True
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    def __init__(self, attrs=None, setdomid=None, settabindex=None):
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        if attrs is None:
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            attrs = {}
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        self.attrs = attrs
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        if setdomid is not None:
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            # override class's default value
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            self.setdomid = setdomid
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        if settabindex is not None:
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            # override class's default value
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            self.settabindex = settabindex
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    def add_media(self, form):
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        """adds media (CSS & JS) required by this widget"""
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        if self.needs_js:
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            form.req.add_js(self.needs_js)
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        if self.needs_css:
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            form.req.add_css(self.needs_css)
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    def render(self, form, field):
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        """render the widget for the given `field` of `form`.
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        To override in concrete class
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        """
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        raise NotImplementedError
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    def _render_attrs(self, form, field):
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        """return html tag name, attributes and a list of values for the field
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        """
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        name = form.context[field]['name']
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        values = form.context[field]['value']
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        if not isinstance(values, (tuple, list)):
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            values = (values,)
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        attrs = dict(self.attrs)
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        if self.setdomid:
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            attrs['id'] = form.context[field]['id']
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        if self.settabindex and not 'tabindex' in attrs:
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            attrs['tabindex'] = form.req.next_tabindex()
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        return name, values, attrs
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class Input(FieldWidget):
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    """abstract widget class for <input> tag based widgets"""
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    type = None
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    def render(self, form, field):
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        """render the widget for the given `field` of `form`.
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        Generate one <input> tag for each field's value
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        """
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        self.add_media(form)
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        name, values, attrs = self._render_attrs(form, field)
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        inputs = [tags.input(name=name, value=value, type=self.type, **attrs)
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                  for value in values]
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        return u'\n'.join(inputs)
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# basic html widgets ###########################################################
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class TextInput(Input):
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    """<input type='text'>"""
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    type = 'text'
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class PasswordInput(Input):
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    """<input type='password'> and its confirmation field (using
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    <field's name>-confirm as name)
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    """
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    type = 'password'
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    def render(self, form, field):
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        self.add_media(form)
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        name, values, attrs = self._render_attrs(form, field)
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        assert len(values) == 1
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        id = attrs.pop('id')
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        try:
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            confirmname = '%s-confirm:%s' % tuple(name.rsplit(':', 1))
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        except TypeError:
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            confirmname = '%s-confirm' % name
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        inputs = [tags.input(name=name, value=values[0], type=self.type, id=id, **attrs),
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                  '<br/>',
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                  tags.input(name=confirmname, value=values[0], type=self.type, **attrs),
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                  '&nbsp;', tags.span(form.req._('confirm password'),
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                                      **{'class': 'emphasis'})]
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        return u'\n'.join(inputs)
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class FileInput(Input):
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    """<input type='file'>"""
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    type = 'file'
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    def _render_attrs(self, form, field):
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        # ignore value which makes no sense here (XXX even on form validation error?)
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        name, values, attrs = super(FileInput, self)._render_attrs(form, field)
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        return name, ('',), attrs
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class HiddenInput(Input):
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    """<input type='hidden'>"""
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    type = 'hidden'
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    setdomid = False # by default, don't set id attribute on hidden input
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    settabindex = False
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class ButtonInput(Input):
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    """<input type='button'>
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    if you want a global form button, look at the Button, SubmitButton,
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    ResetButton and ImgButton classes below.
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    """
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    type = 'button'
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class TextArea(FieldWidget):
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    """<textarea>"""
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    def render(self, form, field):
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        name, values, attrs = self._render_attrs(form, field)
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        attrs.setdefault('onkeypress', 'autogrow(this)')
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        attrs.setdefault('cols', 80)
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        attrs.setdefault('rows', 20)
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        if not values:
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            value = u''
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        elif len(values) == 1:
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            value = values[0]
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        else:
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            raise ValueError('a textarea is not supposed to be multivalued')
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        return tags.textarea(value, name=name, **attrs)
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class FCKEditor(TextArea):
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    """FCKEditor enabled <textarea>"""
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    def __init__(self, *args, **kwargs):
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        super(FCKEditor, self).__init__(*args, **kwargs)
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        self.attrs['cubicweb:type'] = 'wysiwyg'
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    def render(self, form, field):
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        form.req.fckeditor_config()
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        return super(FCKEditor, self).render(form, field)
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class Select(FieldWidget):
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    """<select>, for field having a specific vocabulary"""
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    def __init__(self, attrs=None, multiple=False):
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        super(Select, self).__init__(attrs)
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        self._multiple = multiple
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    def render(self, form, field):
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        name, curvalues, attrs = self._render_attrs(form, field)
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        if not 'size' in attrs and self._multiple:
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            attrs['size'] = '5'
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        options = []
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        for label, value in field.vocabulary(form):
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            if value is None:
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                # handle separator
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                options.append(u'<optgroup label="%s"/>' % (label or ''))
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            elif value in curvalues:
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                options.append(tags.option(label, value=value, selected='selected'))
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            else:
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                options.append(tags.option(label, value=value))
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        return tags.select(name=name, multiple=self._multiple,
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                           options=options, **attrs)
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class CheckBox(Input):
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    """<input type='checkbox'>, for field having a specific vocabulary. One
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    input will be generated for each possible value.
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    """
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    type = 'checkbox'
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    def render(self, form, field):
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        name, curvalues, attrs = self._render_attrs(form, field)
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        options = []
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        for label, value in field.vocabulary(form):
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            if value in curvalues:
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                tag = tags.input(name=name, value=value, type=self.type,
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                                 checked='checked', **attrs)
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            else:
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                tag = tags.input(name=name, value=value, type=self.type,
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                                 **attrs)
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            options.append(tag + label)
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        return '<br/>\n'.join(options)
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class Radio(Input):
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    """<input type='radio'>, for field having a specific vocabulary. One
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    input will be generated for each possible value.
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    """
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    type = 'radio'
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    def render(self, form, field):
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        name, curvalues, attrs = self._render_attrs(form, field)
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        domid = attrs.pop('id', None)
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        options = []
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        for i, (label, value) in enumerate(field.vocabulary(form)):
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            iattrs = attrs.copy()
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            if i == 0 and domid is not None:
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                iattrs['id'] = domid
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            if value in curvalues:
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                iattrs['checked'] = u'checked'
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            tag = tags.input(name=name, type=self.type, value=value, **iattrs)
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            options.append(tag + label + '<br/>')
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        return '\n'.join(options)
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# javascript widgets ###########################################################
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class DateTimePicker(TextInput):
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    """<input type='text' + javascript date/time picker for date or datetime
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    fields
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    """
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    monthnames = ('january', 'february', 'march', 'april',
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                  'may', 'june', 'july', 'august',
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                  'september', 'october', 'november', 'december')
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    daynames = ('monday', 'tuesday', 'wednesday', 'thursday',
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                'friday', 'saturday', 'sunday')
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    needs_js = ('cubicweb.calendar.js',)
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    needs_css = ('cubicweb.calendar_popup.css',)
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    @classmethod
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    def add_localized_infos(cls, req):
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        """inserts JS variables defining localized months and days"""
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        # import here to avoid dependancy from cubicweb-common to simplejson
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        _ = req._
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        monthnames = [_(mname) for mname in cls.monthnames]
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        daynames = [_(dname) for dname in cls.daynames]
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        req.html_headers.define_var('MONTHNAMES', monthnames)
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        req.html_headers.define_var('DAYNAMES', daynames)
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    def render(self, form, field):
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        txtwidget = super(DateTimePicker, self).render(form, field)
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        self.add_localized_infos(form.req)
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        cal_button = self._render_calendar_popup(form, field)
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        return txtwidget + cal_button
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    def _render_calendar_popup(self, form, field):
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        value = form.form_field_value(field)
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        if not value:
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            value = date.today()
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        inputid = form.context[field]['id']
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        helperid = '%shelper' % inputid
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        year, month = value.year, value.month
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        return (u"""<a onclick="toggleCalendar('%s', '%s', %s, %s);" class="calhelper">
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<img src="%s" title="%s" alt="" /></a><div class="calpopup hidden" id="%s"></div>"""
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                % (helperid, inputid, year, month,
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                   form.req.external_resource('CALENDAR_ICON'),
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                   form.req._('calendar'), helperid) )
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# ajax widgets ################################################################
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def init_ajax_attributes(attrs, wdgtype, loadtype=u'auto'):
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    try:
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        attrs['klass'] += u' widget'
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    except KeyError:
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        attrs['klass'] = u'widget'
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    attrs.setdefault('cubicweb:wdgtype', wdgtype)
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    attrs.setdefault('cubicweb:loadtype', loadtype)
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class AjaxWidget(FieldWidget):
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    """simple <div> based ajax widget"""
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    def __init__(self, wdgtype, inputid=None, **kwargs):
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        super(AjaxWidget, self).__init__(**kwargs)
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        init_ajax_attributes(self.attrs, wdgtype)
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        if inputid is not None:
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            self.attrs['cubicweb:inputid'] = inputid
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    def render(self, form, field):
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        self.add_media(form)
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        attrs = self._render_attrs(form, field)[-1]
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        return tags.div(**attrs)
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class AutoCompletionWidget(TextInput):
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    """ajax widget for StringField, proposing matching existing values as you
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    type.
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    """
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    needs_js = ('cubicweb.widgets.js', 'jquery.autocomplete.js')
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    needs_css = ('jquery.autocomplete.css',)
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    wdgtype = 'SuggestField'
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    loadtype = 'auto'
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    def _render_attrs(self, form, field):
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        name, values, attrs = super(AutoCompletionWidget, self)._render_attrs(form, field)
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        if not values[0]:
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            values = (INTERNAL_FIELD_VALUE,)
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        init_ajax_attributes(attrs, self.wdgtype, self.loadtype)
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        # XXX entity form specific
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        attrs['cubicweb:dataurl'] = self._get_url(form.edited_entity)
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        return name, values, attrs
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    def _get_url(self, entity):
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        return entity.req.build_url('json', fname=entity.autocomplete_initfuncs[self.rschema],
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                                pageid=entity.req.pageid, mode='remote')
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   318
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   319
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class StaticFileAutoCompletionWidget(AutoCompletionWidget):
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    """XXX describe me"""
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    wdgtype = 'StaticFileSuggestField'
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   323
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    def _get_url(self, entity):
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   325
        return entity.req.datadir_url + entity.autocomplete_initfuncs[self.rschema]
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   326
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   327
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class RestrictedAutoCompletionWidget(AutoCompletionWidget):
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    """XXX describe me"""
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    wdgtype = 'RestrictedSuggestField'
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   332
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class AddComboBoxWidget(Select):
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   334
    def _render_attrs(self, form, field):
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        name, values, attrs = super(AddComboBoxWidget, self)._render_attrs(form, field)
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   336
        init_ajax_attributes(self.attrs, 'AddComboBox')
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        # XXX entity form specific
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   338
        entity = form.edited_entity
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        attrs['cubicweb:etype_to'] = entity.e_schema
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        etype_from = entity.e_schema.subject_relation(self.name).objects(entity.e_schema)[0]
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        attrs['cubicweb:etype_from'] = etype_from
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   342
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    def render(self, form, field):
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   344
        return super(AddComboBoxWidget, self).render(form, field) + u'''
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   345
<div id="newvalue">
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   346
  <input type="text" id="newopt" />
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   347
  <a href="javascript:noop()" id="add_newopt">&nbsp;</a></div>
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'''
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# buttons ######################################################################
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   351
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   352
class Button(Input):
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   353
    """<input type='button'>, base class for global form buttons
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    note label is a msgid which will be translated at form generation time, you
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   356
    should not give an already translated string.
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   357
    """
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   358
    type = 'button'
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   359
    def __init__(self, label=stdmsgs.BUTTON_OK, attrs=None,
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   360
                 setdomid=None, settabindex=None,
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   361
                 name='', value='', onclick=None, cwaction=None):
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   362
        super(Button, self).__init__(attrs, setdomid, settabindex)
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   363
        self.label = label
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   364
        self.name = name
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   365
        self.value = ''
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   366
        self.onclick = onclick
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   367
        self.cwaction = cwaction
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   368
        self.attrs.setdefault('klass', 'validateButton')
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   369
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    def render(self, form, field=None):
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   371
        label = form.req._(self.label)
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   372
        attrs = self.attrs.copy()
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   373
        if self.cwaction:
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   374
            assert self.onclick is None
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   375
            attrs['onclick'] = "postForm('__action_%s', \'%s\', \'%s\')" % (
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   376
                self.cwaction, self.label, form.domid)
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   377
        elif self.onclick:
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   378
            attrs['onclick'] = self.onclick
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   379
        if self.name:
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   380
            attrs['name'] = name
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   381
            if self.setdomid:
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   382
                attrs['id'] = self.name
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   383
        if self.settabindex and not 'tabindex' in attrs:
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   384
            attrs['tabindex'] = form.req.next_tabindex()
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   385
        return tags.input(value=label, type=self.type, **attrs)
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   386
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   387
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   388
class SubmitButton(Button):
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   389
    """<input type='submit'>, main button to submit a form"""
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   390
    type = 'submit'
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   391
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   392
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   393
class ResetButton(Button):
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diff changeset
   394
    """<input type='reset'>, main button to reset a form.
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   395
    You usually don't want this.
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diff changeset
   396
    """
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    type = 'reset'
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class ImgButton(object):
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    """<img> wrapped into a <a> tag with href triggering something (usually a
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    javascript call)
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    note label is a msgid which will be translated at form generation time, you
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    should not give an already translated string.
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    """
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    def __init__(self, domid, href, label, imgressource):
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        self.domid = domid
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        self.href = href
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        self.imgressource = imgressource
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        self.label = label
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    def render(self, form, field=None):
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        label = form.req._(self.label)
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        imgsrc = form.req.external_resource(self.imgressource)
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        return '<a id="%(domid)s" href="%(href)s">'\
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               '<img src="%(imgsrc)s" alt="%(label)s"/>%(label)s</a>' % {
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            'label': label, 'imgsrc': imgsrc,
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            'domid': self.domid, 'href': self.href}
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# XXX EntityLinkComboBoxWidget, [Raw]DynamicComboBoxWidget