# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
import mimetypes
from .widget_core import CoreWidget
from .domwidget import DOMWidget
from .valuewidget import ValueWidget
from .widget import register
from traitlets import Unicode, CUnicode, Bool
from .trait_types import CByteMemoryView
@register
class _Media(DOMWidget, ValueWidget, CoreWidget):
"""Base class for Image, Audio and Video widgets.
The `value` of this widget accepts a byte string. The byte string is the
raw data that you want the browser to display.
If you pass `"url"` to the `"format"` trait, `value` will be interpreted
as a URL as bytes encoded in UTF-8.
"""
# Define the custom state properties to sync with the front-end
value = CByteMemoryView(help="The media data as a memory view of bytes.").tag(sync=True)
@classmethod
def _from_file(cls, tag, filename, **kwargs):
"""
Create an :class:`Media` from a local file.
Parameters
----------
filename: str
The location of a file to read into the value from disk.
**kwargs:
The keyword arguments for `Media`
Returns an `Media` with the value set from the filename.
"""
value = cls._load_file_value(filename)
if 'format' not in kwargs:
format = cls._guess_format(tag, filename)
if format is not None:
kwargs['format'] = format
return cls(value=value, **kwargs)
@classmethod
def from_url(cls, url, **kwargs):
"""
Create an :class:`Media` from a URL.
:code:`Media.from_url(url)` is equivalent to:
.. code-block: python
med = Media(value=url, format='url')
But both unicode and bytes arguments are allowed for ``url``.
Parameters
----------
url: [str, bytes]
The location of a URL to load.
"""
if isinstance(url, str):
# If str, it needs to be encoded to bytes
url = url.encode('utf-8')
return cls(value=url, format='url', **kwargs)
def set_value_from_file(self, filename):
"""
Convenience method for reading a file into `value`.
Parameters
----------
filename: str
The location of a file to read into value from disk.
"""
value = self._load_file_value(filename)
self.value = value
@classmethod
def _load_file_value(cls, filename):
if getattr(filename, 'read', None) is not None:
return filename.read()
else:
with open(filename, 'rb') as f:
return f.read()
@classmethod
def _guess_format(cls, tag, filename):
# file objects may have a .name parameter
name = getattr(filename, 'name', None)
name = name or filename
try:
mtype, _ = mimetypes.guess_type(name)
if not mtype.startswith('{}/'.format(tag)):
return None
return mtype[len('{}/'.format(tag)):]
except Exception:
return None
def _get_repr(self, cls):
# Truncate the value in the repr, since it will
# typically be very, very large.
class_name = self.__class__.__name__
# Return value first like a ValueWidget
signature = []
sig_value = 'value={!r}'.format(self.value[:40].tobytes())
if self.value.nbytes > 40:
sig_value = sig_value[:-1]+"..."+sig_value[-1]
signature.append(sig_value)
for key in super(cls, self)._repr_keys():
if key == 'value':
continue
value = str(getattr(self, key))
signature.append('{}={!r}'.format(key, value))
signature = ', '.join(signature)
return '{}({})'.format(class_name, signature)
[docs]@register
class Image(_Media):
"""Displays an image as a widget.
The `value` of this widget accepts a byte string. The byte string is the
raw image data that you want the browser to display. You can explicitly
define the format of the byte string using the `format` trait (which
defaults to "png").
If you pass `"url"` to the `"format"` trait, `value` will be interpreted
as a URL as bytes encoded in UTF-8.
"""
_view_name = Unicode('ImageView').tag(sync=True)
_model_name = Unicode('ImageModel').tag(sync=True)
# Define the custom state properties to sync with the front-end
format = Unicode('png', help="The format of the image.").tag(sync=True)
width = CUnicode(help="Width of the image in pixels. Use layout.width "
"for styling the widget.").tag(sync=True)
height = CUnicode(help="Height of the image in pixels. Use layout.height "
"for styling the widget.").tag(sync=True)
[docs] def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
@classmethod
def from_file(cls, filename, **kwargs):
return cls._from_file('image', filename, **kwargs)
[docs] def __repr__(self):
return self._get_repr(Image)
[docs]@register
class Video(_Media):
"""Displays a video as a widget.
The `value` of this widget accepts a byte string. The byte string is the
raw video data that you want the browser to display. You can explicitly
define the format of the byte string using the `format` trait (which
defaults to "mp4").
If you pass `"url"` to the `"format"` trait, `value` will be interpreted
as a URL as bytes encoded in UTF-8.
"""
_view_name = Unicode('VideoView').tag(sync=True)
_model_name = Unicode('VideoModel').tag(sync=True)
# Define the custom state properties to sync with the front-end
format = Unicode('mp4', help="The format of the video.").tag(sync=True)
width = CUnicode(help="Width of the video in pixels.").tag(sync=True)
height = CUnicode(help="Height of the video in pixels.").tag(sync=True)
autoplay = Bool(True, help="When true, the video starts when it's displayed").tag(sync=True)
loop = Bool(True, help="When true, the video will start from the beginning after finishing").tag(sync=True)
controls = Bool(True, help="Specifies that video controls should be displayed (such as a play/pause button etc)").tag(sync=True)
@classmethod
def from_file(cls, filename, **kwargs):
return cls._from_file('video', filename, **kwargs)
[docs] def __repr__(self):
return self._get_repr(Video)
[docs]@register
class Audio(_Media):
"""Displays a audio as a widget.
The `value` of this widget accepts a byte string. The byte string is the
raw audio data that you want the browser to display. You can explicitly
define the format of the byte string using the `format` trait (which
defaults to "mp3").
If you pass `"url"` to the `"format"` trait, `value` will be interpreted
as a URL as bytes encoded in UTF-8.
"""
_view_name = Unicode('AudioView').tag(sync=True)
_model_name = Unicode('AudioModel').tag(sync=True)
# Define the custom state properties to sync with the front-end
format = Unicode('mp3', help="The format of the audio.").tag(sync=True)
autoplay = Bool(True, help="When true, the audio starts when it's displayed").tag(sync=True)
loop = Bool(True, help="When true, the audio will start from the beginning after finishing").tag(sync=True)
controls = Bool(True, help="Specifies that audio controls should be displayed (such as a play/pause button etc)").tag(sync=True)
@classmethod
def from_file(cls, filename, **kwargs):
return cls._from_file('audio', filename, **kwargs)
[docs] def __repr__(self):
return self._get_repr(Audio)
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