aboutsummaryrefslogtreecommitdiffstats
path: root/bn_django/photos/models.py
blob: fd31fa6df7e2a649fad6296e723d8b577d0b9d8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
from django.db import models
from django.utils.translation import ugettext as _
import django.contrib.auth.models as auth
from django.conf import settings
from django.dispatch import dispatcher
from django.db.models import signals

import os, os.path
import Image

# Handle settings here
try:
    STOCKPHOTO_BASE = settings.STOCKPHOTO_BASE.strip('/')
except AttributeError:
    STOCKPHOTO_BASE='photos'
    
try:
    STOCKPHOTO_URL = settings.STOCKPHOTO_URL
except AttributeError:
    STOCKPHOTO_URL='/photos'
if STOCKPHOTO_URL[-1] == '/':
    STOCKPHOTO_URL=STOCKPHOTO_URL[:-1]

try:
    ADMIN_URL = settings.ADMIN_URL
except AttributeError:
    ADMIN_URL='/admin'
if ADMIN_URL[-1] == '/':
    ADMIN_URL=ADMIN_URL[:-1]

# Create your models here.
class Gallery(models.Model):
    title = models.CharField("title", max_length=80)
    slug = models.SlugField()
    date = models.DateField("publication date", auto_now_add=True)
    created = models.ForeignKey(auth.User,
                              verbose_name="gallery created by"
                              )
    display_width = models.IntegerField(
        "width to display full images",
        default=640)
    display_height = models.IntegerField(
        "height to display full images",
        default=480)
    thumbnail_width = models.IntegerField(
        "width to display thumbnails",
        default=150)
    thumbnail_height = models.IntegerField(
        "height to display thumbnails",
        default=100)

    class Meta:
        get_latest_by = 'date'

    class Admin:
        ordering = ['date']
        prepopulated_fields = {'slug': 'title'}

    def __str__(self):
        return self.title
    def get_absolute_url(self):
        return "%s/%d/" % (STOCKPHOTO_URL, self.id)
    def get_admin_url(self):
        return "%s/photos/gallery/%d/" % (ADMIN_URL, self.id)
    def was_published_today(self):
        return self.date.date() == datetime.date.today()

    def first(self):
        try:
            return self.photo_set.all()[0]
        except IndexError:
            return None
    def update_thumbs(self):
        for photo in self.photo_set.all():
            photo.create_disp()
            photo.create_thumb()

class Photo(models.Model):
    # import os, os.path, Image
    image = models.ImageField("Photograph",
                            upload_to= STOCKPHOTO_BASE + "/%Y/%m/%d/")
    title = models.CharField("title", max_length=80)
    desc = models.TextField("description", blank=True)
    gallery = models.ForeignKey(Gallery, blank=True, null=True)
    photographer = models.CharField("photographer", max_length=80,
                                  blank=True)
    date = models.DateField("date photographed", blank=True, null=True)
    extra = models.TextField("any extra information about the photo",
                           blank=True)
    class META:
        get_latest_by = ['date']

    class Admin:
        list_display = ('title', 'date', 'gallery', 'id')
        ordering = ['id']
        list_filter = ['gallery']
        search_fields = ['title']

    def __str__(self):
        return self.title

    def delete_thumbnails(self):
        """Remove thumbnail and display-sized images when deleting.

        This may fail if, for example, they don't exist, so it should
        fail silently.  It may not be a good idea to delete the
        original, as the user may not understand that deleting it from
        the gallery deletes it from the filesystem, so currently we
        don't do that.
        
        """
        try:
            os.unlink(self.thumbpath())
        except (IOError, OSError):
            pass
        try:
            os.unlink(self.disppath())
        except (IOError, OSError):
            pass
        # Deleting the original might be a bad thing.
        #os.unlink(self.fullpath())

    def get_absolute_url(self):
        return "%s/detail/%d/" % (STOCKPHOTO_URL, self.id)

    def get_admin_url(self):
        return "%s/photos/photos/%d/" % (ADMIN_URL, self.id)

    def thumbpath(self):
        """Path to the thumbnail
        """
        photobase = self.image.name[len(STOCKPHOTO_BASE)+1:]
        return os.path.join( settings.MEDIA_ROOT, STOCKPHOTO_BASE,
                     "cache", "thumbs", photobase)

    def thumburl(self):
        """URL to the thumbnail
        """
        photobase = self.image.name[len(STOCKPHOTO_BASE)+1:]
        if settings.MEDIA_URL.endswith('/'):
            return settings.MEDIA_URL + STOCKPHOTO_BASE + \
                "/cache/thumbs/" + photobase
        return settings.MEDIA_URL + '/' + STOCKPHOTO_BASE + \
            "/cache/thumbs/" + photobase
            

    def disppath(self):
        photobase = self.image.name[len(STOCKPHOTO_BASE)+1:]
        return os.path.join( settings.MEDIA_ROOT, STOCKPHOTO_BASE,
                         "cache", photobase)

    def dispurl(self):
        photobase = self.image.name[len(STOCKPHOTO_BASE)+1:]
        if settings.MEDIA_URL.endswith('/'):
            return settings.MEDIA_URL + STOCKPHOTO_BASE + "/cache/" \
                + photobase
        return settings.MEDIA_URL + '/' + STOCKPHOTO_BASE + \
            "/cache/" + photobase            

    def fullpath(self):
        if self.image.name.startswith(os.path.sep):
            return self.image.name
        return os.path.join(settings.MEDIA_ROOT, self.image.name)

    def fullurl(self):
        if self.image.name.startswith(os.path.sep):
            # Shouldn't happen anymore
            return (settings.MEDIA_URL +
                    self.image.name[len(settings.MEDIA_ROOT):])
        else:
            if settings.MEDIA_URL.endswith('/'):
                return settings.MEDIA_URL + self.image.name
            return settings.MEDIA_URL + '/' + self.image.name
        

    def next(self):
        '''Return id of 'next' photo in the same gallery or None if at
        the end.'''
        # we could probably be more clever here by using the new nifty 
        # db access filters and queries, but for now, this is good enough
        photo_list = [x for x in self.gallery.photo_set.all()]
        ind = photo_list.index(self)
        if (ind +1) == len(photo_list):
            return None
        else:
            return photo_list[ind + 1]

    def prev(self):
        """Return id of 'previous' photo in the same gallery or None
        if at the beginning
        """
        photo_list = [x for x in self.gallery.photo_set.all()]
        ind = photo_list.index(self)
        if ind == 0:
            return False
        else:
            return photo_list[ind - 1]

    def full_exists(self):
        return os.path.exists( self.fullpath() )

    def disp_exists(self):
        return os.path.exists( self.disppath() )

    def thumb_exists(self):
        return os.path.exists( self.thumbpath() )

    def create_disp(self):
        im = Image.open( self.fullpath() )
        format = im.format
        # create the path for the display image
        disp_path = self.disppath()
        disp_dir = os.path.dirname(disp_path)
        if not os.path.exists(disp_dir):
            os.makedirs(disp_dir, 0775)

        # Make a copy of the image, scaled, if needed.
        maxwidth = self.gallery.display_width
        maxheight = self.gallery.display_height
        width, height = im.size
        if (width > maxwidth) and width > height:
            scale = float(maxwidth)/width
            width = int(width * scale)
            height = int(height * scale)
            newim = im.resize( (width, height), Image.ANTIALIAS )
        elif (height > maxheight) and height >= width:
            scale = float(maxheight)/height
            width = int(width * scale)
            height = int(height * scale)
            newim = im.resize( (width, height), Image.ANTIALIAS )
        else:
            newim = im
        newim.save(disp_path, format)

    def create_thumb(self):
        im = Image.open( self.fullpath() )
        format = im.format
        # create the path for the thumbnail image
        thumb_path = self.thumbpath()
        thumb_dir = os.path.dirname(thumb_path)
        if not os.path.exists(thumb_dir):
            os.makedirs(thumb_dir, 0775)

        # Make a copy of the image, scaled, if needed.
        maxwidth = self.gallery.thumbnail_width
        maxheight = self.gallery.thumbnail_height
        width, height = im.size
        if (width > maxwidth) and (width > height):
            scale = float(maxwidth)/width
            width = int(width * scale)
            height = int(height * scale)
            newim = im.resize( (width, height), Image.ANTIALIAS )
        elif (height > maxheight):
            scale = float(maxheight)/height
            width = int(width * scale)
            height = int(height * scale)
            newim = im.resize( (width, height), Image.ANTIALIAS )
        else:
            newim = im
        newim.save(thumb_path, format)

    def build_display_images(self):
        """Make thumbnail and display-sized images after saving.
        
        For some reason, this may fail on a first pass (self.image may
        be empty when this is called), but if we just let it fail
        silently, it will apparently get called again and succeed.
        """
        if self.image:
            if not self.thumb_exists():
                self.create_thumb()
            if not self.disp_exists():
                self.create_disp()

def build_display_images(sender, instance, signal, *args, **kwargs):
    """Simple hook for save-after trigger
    """
    instance.build_display_images()
def delete_thumbnails(sender, instance, signal, *args, **kwargs):
    """Simple hook for pre-delete trigger.
    """
    instance.delete_thumbnails()

signals.post_save.connect(build_display_images, sender=Photo)
signals.pre_delete.connect(delete_thumbnails, sender=Photo)

#dispatcher.connect(build_display_images, signal=signals.post_save,
#                   sender=Photo) 
#dispatcher.connect(delete_thumbnails, signal=signals.pre_delete,
#                   sender=Photo)


from django.contrib import admin

admin.site.register(Photo)
admin.site.register(Gallery)