HomeDashboard/.venv/lib/python3.12/site-packages/nicegui/elements/upload.py
2026-01-03 14:54:18 +01:00

129 lines
6.0 KiB
Python

from typing import Optional, cast
from fastapi import Request
from starlette.datastructures import UploadFile
from typing_extensions import Self
from ..events import Handler, MultiUploadEventArguments, UiEventArguments, UploadEventArguments, handle_event
from ..nicegui import app
from .mixins.disableable_element import DisableableElement
from .mixins.label_element import LabelElement
from .upload_files import create_file_upload
class Upload(LabelElement, DisableableElement, component='upload.js'):
# pylint: disable=import-outside-toplevel
from .upload_files import FileUpload, LargeFileUpload, SmallFileUpload
def __init__(self, *,
multiple: bool = False,
max_file_size: Optional[int] = None,
max_total_size: Optional[int] = None,
max_files: Optional[int] = None,
on_begin_upload: Optional[Handler[UiEventArguments]] = None,
on_upload: Optional[Handler[UploadEventArguments]] = None,
on_multi_upload: Optional[Handler[MultiUploadEventArguments]] = None,
on_rejected: Optional[Handler[UiEventArguments]] = None,
label: str = '',
auto_upload: bool = False,
) -> None:
"""File Upload
Based on Quasar's `QUploader <https://quasar.dev/vue-components/uploader>`_ component.
Upload event handlers are called in the following order:
1. ``on_begin_upload``: The client begins uploading one or more files to the server.
2. ``on_upload``: The upload of an individual file is complete.
3. ``on_multi_upload``: The upload of all selected files is complete.
The following event handler is already called during the file selection process:
- ``on_rejected``: One or more files have been rejected.
:param multiple: allow uploading multiple files at once (default: `False`)
:param max_file_size: maximum file size in bytes (default: `0`)
:param max_total_size: maximum total size of all files in bytes (default: `0`)
:param max_files: maximum number of files (default: `0`)
:param on_begin_upload: callback to execute when upload begins (*added in version 2.14.0*)
:param on_upload: callback to execute for each uploaded file
:param on_multi_upload: callback to execute after multiple files have been uploaded
:param on_rejected: callback to execute when one or more files have been rejected during file selection
:param label: label for the uploader (default: `''`)
:param auto_upload: automatically upload files when they are selected (default: `False`)
"""
super().__init__(label=label)
self._props['multiple'] = multiple
self._props['auto-upload'] = auto_upload
self._props['url'] = f'/_nicegui/client/{self.client.id}/upload/{self.id}'
if max_file_size is not None:
self._props['max-file-size'] = max_file_size
if max_total_size is not None:
self._props['max-total-size'] = max_total_size
if max_files is not None:
self._props['max-files'] = max_files
if multiple and on_multi_upload:
self._props['batch'] = True
self._begin_upload_handlers = [on_begin_upload] if on_begin_upload else []
self._upload_handlers = [on_upload] if on_upload else []
self._multi_upload_handlers = [on_multi_upload] if on_multi_upload else []
@app.post(self._props['url'])
async def upload_route(request: Request) -> dict[str, str]:
for begin_upload_handler in self._begin_upload_handlers:
handle_event(begin_upload_handler, UiEventArguments(sender=self, client=self.client))
async with request.form() as form:
files = [await create_file_upload(cast(UploadFile, data)) for data in form.values()]
await self.handle_uploads(files)
return {'upload': 'success'}
if on_rejected:
self.on_rejected(on_rejected)
async def handle_uploads(self, files: list[FileUpload]) -> None:
"""Handle the uploaded files.
This method is primarily intended for internal use and for simulating file uploads in tests.
"""
assert all(isinstance(f, Upload.FileUpload) for f in files), \
'since NiceGUI 3.0, uploads must be a list of FileUpload instances'
for file in files:
for upload_handler in self._upload_handlers:
handle_event(upload_handler, UploadEventArguments(sender=self, client=self.client, file=file))
multi_upload_args = MultiUploadEventArguments(sender=self, client=self.client, files=files)
for multi_upload_handler in self._multi_upload_handlers:
handle_event(multi_upload_handler, multi_upload_args)
def on_begin_upload(self, callback: Handler[UiEventArguments]) -> Self:
"""Add a callback to be invoked when the upload begins."""
self._begin_upload_handlers.append(callback)
return self
def on_upload(self, callback: Handler[UploadEventArguments]) -> Self:
"""Add a callback to be invoked when a file is uploaded."""
self._upload_handlers.append(callback)
return self
def on_multi_upload(self, callback: Handler[MultiUploadEventArguments]) -> Self:
"""Add a callback to be invoked when multiple files have been uploaded."""
self._multi_upload_handlers.append(callback)
return self
def on_rejected(self, callback: Handler[UiEventArguments]) -> Self:
"""Add a callback to be invoked when one or more files have been rejected during file selection."""
self.on('rejected', lambda: handle_event(callback, UiEventArguments(sender=self, client=self.client)), args=[])
return self
def reset(self) -> None:
"""Clear the upload queue."""
self.run_method('reset')
def _handle_delete(self) -> None:
app.remove_route(self._props['url'])
super()._handle_delete()