rudimentary theme support

src/c3nav/mapdata/models/theme.py

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+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from c3nav.mapdata.models import LocationGroup
+from c3nav.mapdata.models.base import TitledMixin
+from c3nav.mapdata.models.geometry.space import ObstacleGroup
+
+
+class Theme(TitledMixin, models.Model):
+    """
+    A theme
+    """
+    # TODO: when a theme base colors change we need to bust the cache somehow
+    description = models.TextField()
+    color_background = models.CharField(max_length=32, verbose_name=_('background color'))
+    color_wall_fill = models.CharField(max_length=32, verbose_name=_('wall fill color'))
+    color_wall_border = models.CharField(max_length=32, verbose_name=_('wall border color'))
+    color_door_fill = models.CharField(max_length=32, verbose_name=_('door fill color'))
+    color_ground_fill = models.CharField(max_length=32, verbose_name=_('ground fill color'))
+    color_obstacles_default_fill = models.CharField(max_length=32, verbose_name=_('default fill color for obstacles'))
+    color_obstacles_default_border = models.CharField(max_length=32,
+                                                      verbose_name=_('default border color for obstacles'))
+
+    last_updated = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        verbose_name = _('Theme')
+        verbose_name_plural = _('Themes')
+        default_related_name = 'themes'
+
+
+class ThemeLocationGroupBackgroundColor(models.Model):
+    """
+    A background color for a LocationGroup in a theme
+    """
+    theme = models.ForeignKey(Theme, on_delete=models.CASCADE, related_name="location_groups")
+    location_group = models.ForeignKey(LocationGroup, on_delete=models.SET_NULL, null=True, blank=True,
+                                       related_name="theme_colors")
+    fill_color = models.CharField(max_length=32, null=True, blank=True)
+    border_color = models.CharField(max_length=32, null=True, blank=True)
+
+    def save(self, *args, **kwargs):
+        self.location_group.register_changed_geometries()
+        super().save(*args, **kwargs)
+
+    def delete(self, *args, **kwargs):
+        self.location_group.register_changed_geometries()
+        super().delete(*args, **kwargs)
+
+
+class ThemeObstacleGroupBackgroundColor(models.Model):
+    """
+    A background color for an ObstacleGroup in a theme
+    """
+    theme = models.ForeignKey(Theme, on_delete=models.CASCADE, related_name="obstacle_groups")
+    obstacle_group = models.ForeignKey(ObstacleGroup, on_delete=models.SET_NULL, null=True, blank=True, related_name="theme_colors")
+    fill_color = models.CharField(max_length=32, null=True, blank=True)
+    border_color = models.CharField(max_length=32, null=True, blank=True)