Admin mixin and widget

embed_video/admin.py

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+from django import forms
+from django.utils.safestring import mark_safe
+
+from .backends import detect_backend
+from .fields import EmbedVideoField
+
+
+class AdminVideoWidget(forms.TextInput):
+    output_format = u'<div style="float:left" class="video">' \
+                    u'{video}<br />{input}</div>' \
+                    u'<hr style="visibility: hidden; clear:both">'
+
+    def __init__(self, attrs=None):
+        default_attrs = {'size': '40'}
+
+        if attrs:
+            default_attrs.update(attrs)
+
+        super(AdminVideoWidget, self).__init__(default_attrs)
+
+    def render(self, name, value='', attrs=None, size=(420, 315)):
+        output = super(AdminVideoWidget, self).render(name, value, attrs)
+
+        if value:
+            try:
+                backend = detect_backend(value)
+            except:
+                pass
+            else:
+                output = self.output_format.format(
+                    video=backend.get_embed_code(*size),
+                    input=output,
+                )
+
+        return mark_safe(output)
+
+
+class AdminVideoMixin(object):
+    def formfield_for_dbfield(self, db_field, **kwargs):
+        if isinstance(db_field, EmbedVideoField):
+            return db_field.formfield(widget=AdminVideoWidget)
+
+        return super(AdminVideoMixin, self) \
+                .formfield_for_dbfield(db_field, **kwargs)

embed_video/tests/tests_admin.py

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+from unittest import TestCase
+
+from django.forms import TextInput
+
+from embed_video.admin import AdminVideoWidget, AdminVideoMixin
+from embed_video.backends import VimeoBackend
+from embed_video.fields import EmbedVideoField, EmbedVideoFormField
+
+
+class AdminVideoWidgetTestCase(TestCase):
+    def test_size(self):
+        widget = AdminVideoWidget()
+        self.assertTrue('size' in widget.attrs)
+
+    def test_overwrite_size(self):
+        widget = AdminVideoWidget(attrs={'size': 0})
+        self.assertEqual(widget.attrs['size'], 0)
+
+    def test_add_to_attrs(self):
+        widget = AdminVideoWidget(attrs={'name': 'foo'})
+        self.assertEqual(widget.attrs['name'], 'foo')
+        self.assertTrue('size' in widget.attrs)
+
+    def test_render_empty_value(self):
+        widget = AdminVideoWidget(attrs={'size': '0'})
+        self.assertEqual(widget.render('foo'),
+                         '<input name="foo" size="0" type="text" />')
+
+    def test_render(self):
+        backend = VimeoBackend('https://vimeo.com/1')
+        widget = AdminVideoWidget(attrs={'size': '0'})
+        widget.output_format = '{video}{input}'
+
+        self.assertEqual(
+            widget.render('foo', backend.url, size=(100, 100)),
+            backend.get_embed_code(100, 100)
+            + '<input name="foo" size="0" type="text" value="%s" />'
+                % backend.url
+        )
+
+    def test_incorrect_value(self):
+        widget = AdminVideoWidget()
+        self.assertEqual(widget.render('foo', 'abcd'),
+             '<input name="foo" size="40" type="text" value="abcd" />')
+
+
+class AdminVideoMixinTestCase(TestCase):
+    def test_embedvideofield(self):
+        foo = EmbedVideoField()
+        mixin = AdminVideoMixin()
+        self.assertTrue(isinstance(mixin.formfield_for_dbfield(foo),
+                                   EmbedVideoFormField))
+
+    def test_other_fields(self):
+        class Parent(object):
+            def formfield_for_dbfield(*args, **kwargs):
+                raise Exception
+
+        class MyAdmin(AdminVideoMixin, Parent):
+            pass
+
+        myadmin = MyAdmin()
+        self.assertRaises(Exception, myadmin.formfield_for_dbfield, 'foo')