root/plesonet_filefield/trunk/widgets.py

from django import forms
from django.utils.translation import ugettext as _
from django.utils.safestring import mark_safe
from django.conf import settings

class DeleteFileWidget(forms.widgets.FileInput):
    '''
    A AdminFileWidget that shows a delete checkbox
    '''
    input_type = 'file'
    
    def __init__(self, show_delete_checkbox=True, attrs={}):
        super(DeleteFileWidget, self).__init__(attrs)
        self.show_delete_checkbox = show_delete_checkbox

    def render(self, name, value, attrs=None):
        input = super(DeleteFileWidget, self).render(name, value, attrs)
        if value and hasattr(value, "url"):
            item = '<tr><td style="vertical-align: middle;">%s</td><td>%s</td>'
            output = []
            output.append('<table style="border-style: none;">')
            output.append(item % (_('Currently:'), '<a target="_blank" href="%s%s">%s</a>' % (settings.MEDIA_URL, value, value)))
            output.append(item % (_('Change:'), input))
            if self.show_delete_checkbox:
                print "hop"
                output.append(item % (_('Delete') + ':', '<input type="checkbox" name="%s_delete"/>' % name)) # split colon to force "Delete" that is already translated
            output.append('</table>')
            return mark_safe(u''.join(output))
        else:
            return mark_safe(input)

    def value_from_datadict(self, data, files, name):
        if not data.get('%s_delete' % name):
            return super(DeleteFileWidget, self).value_from_datadict(data, files, name)
        else:
            return '__deleted__'