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2024-03-19 13:34:13 -04:00

87 lines
2.4 KiB
Python

import random
import string
from functools import cached_property
__all__ = (
'FieldSet',
'InlineFields',
'ObjectAttribute',
'TabbedGroups',
)
class FieldSet:
"""
A generic grouping of fields, with an optional name. Each item will be rendered
on its own row under the provided heading (name), if any. The following types
may be passed as items:
* Field name (string)
* InlineFields instance
* TabbedGroups instance
* ObjectAttribute instance
Parameters:
items: An iterable of items to be rendered (one per row)
name: The fieldset's name, displayed as a heading (optional)
"""
def __init__(self, *items, name=None):
self.items = items
self.name = name
class InlineFields:
"""
A set of fields rendered inline (side-by-side) with a shared label.
Parameters:
fields: An iterable of form field names
label: The label text to render for the row (optional)
"""
def __init__(self, *fields, label=None):
self.fields = fields
self.label = label
class TabbedGroups:
"""
Two or more groups of fields (FieldSets) arranged under tabs among which the user can toggle.
Parameters:
fieldsets: An iterable of FieldSet instances, one per tab. Each FieldSet *must* have a
name assigned, which will be employed as the tab's label.
"""
def __init__(self, *fieldsets):
for fs in fieldsets:
if not fs.name:
raise ValueError(f"Grouped fieldset {fs} must have a name.")
self.groups = fieldsets
# Initialize a random ID for the group (for tab selection)
self.id = ''.join(
random.choice(string.ascii_lowercase + string.digits) for _ in range(8)
)
@cached_property
def tabs(self):
return [
{
'id': f'{self.id}_{i}',
'title': group.name,
'fields': group.items,
} for i, group in enumerate(self.groups, start=1)
]
class ObjectAttribute:
"""
Renders the value for a specific attribute on the form's instance. This may be used to
display a read-only value and convey additional context to the user. If the attribute has
a `get_absolute_url()` method, it will be rendered as a hyperlink.
Parameters:
name: The name of the attribute to be displayed
"""
def __init__(self, name):
self.name = name