django-avatar/avatar/forms.py

from django import forms
from django.forms import widgets
from django.utils.safestring import mark_safe

from avatar.models import Avatar
from avatar import AVATAR_MAX_AVATARS_PER_USER

def avatar_img(avatar, size):
    if not avatar.thumbnail_exists(size):
        avatar.create_thumbnail(size)
    return mark_safe("""<img src="%s" alt="%s" width="%s" height="%s" />""" % 
        (avatar.avatar_url(size), unicode(avatar), size, size))

class UploadAvatarForm(forms.Form):

    avatar = forms.ImageField()
    
    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user')
        super(UploadAvatarForm, self).__init__(*args, **kwargs)
        
    def clean_avatar(self):
        data = self.cleaned_data['avatar']
        count = Avatar.objects.filter(user=self.user).count()
        if AVATAR_MAX_AVATARS_PER_USER > 1 and \
           count >= AVATAR_MAX_AVATARS_PER_USER: 
            # Note: there is a special case for AVATAR_MAX_AVATARS_PER_USER = 1,
            # we delete the old one and replace it directly with ours, in the
            # model.
            raise forms.ValidationError(
                "You already have %d avatars, and the maximum allowed is %d." %
                (count, AVATAR_MAX_AVATARS_PER_USER))
        return        
        

class PrimaryAvatarForm(forms.Form):
    
    def __init__(self, *args, **kwargs):
        user = kwargs.pop('user')
        size = kwargs.pop('size', 80)
        avatars = kwargs.pop('avatars')
        super(PrimaryAvatarForm, self).__init__(*args, **kwargs)
        self.fields['choice'] = forms.ChoiceField(
            choices=[(c.id, avatar_img(c, size)) for c in avatars],
            widget=widgets.RadioSelect)

class DeleteAvatarForm(forms.Form):

    def __init__(self, *args, **kwargs):
        user = kwargs.pop('user')
        size = kwargs.pop('size', 80)
        avatars = kwargs.pop('avatars')
        super(DeleteAvatarForm, self).__init__(*args, **kwargs)
        self.fields['choices'] = forms.MultipleChoiceField(
            choices=[(c.id, avatar_img(c, size)) for c in avatars],
            widget=widgets.CheckboxSelectMultiple)