69 lines
2.5 KiB
Python
69 lines
2.5 KiB
Python
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# Copyright(c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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"""FileUpload class.
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Represents a file upload button.
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"""
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from traitlets import (
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observe, default, Unicode, Dict, List, Int, Bool, Bytes, CaselessStrEnum
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)
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from .widget_description import DescriptionWidget
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from .valuewidget import ValueWidget
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from .widget_core import CoreWidget
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from .widget_button import ButtonStyle
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from .widget import register, widget_serialization
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from .trait_types import bytes_serialization, InstanceDict
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def content_from_json(value, widget):
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"""
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deserialize file content
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"""
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from_json = bytes_serialization['from_json']
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output = [from_json(e, None) for e in value]
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return output
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@register
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class FileUpload(DescriptionWidget, ValueWidget, CoreWidget):
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"""
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Upload file(s) from browser to Python kernel as bytes
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"""
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_model_name = Unicode('FileUploadModel').tag(sync=True)
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_view_name = Unicode('FileUploadView').tag(sync=True)
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_counter = Int().tag(sync=True)
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accept = Unicode(help='File types to accept, empty string for all').tag(sync=True)
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multiple = Bool(help='If True, allow for multiple files upload').tag(sync=True)
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disabled = Bool(help='Enable or disable button').tag(sync=True)
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icon = Unicode('upload', help="Font-awesome icon name, without the 'fa-' prefix.").tag(sync=True)
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button_style = CaselessStrEnum(
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values=['primary', 'success', 'info', 'warning', 'danger', ''], default_value='',
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help="""Use a predefined styling for the button.""").tag(sync=True)
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style = InstanceDict(ButtonStyle).tag(sync=True, **widget_serialization)
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metadata = List(Dict(), help='List of file metadata').tag(sync=True)
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data = List(Bytes(), help='List of file content (bytes)').tag(
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sync=True, from_json=content_from_json
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)
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error = Unicode(help='Error message').tag(sync=True)
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value = Dict(read_only=True)
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@observe('_counter')
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def on_incr_counter(self, change):
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"""
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counter increment triggers the update of trait value
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"""
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res = {}
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msg = 'Error: length of metadata and data must be equal'
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assert len(self.metadata) == len(self.data), msg
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for metadata, content in zip(self.metadata, self.data):
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name = metadata['name']
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res[name] = {'metadata': metadata, 'content': content}
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self.set_trait('value', res)
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@default('description')
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def _default_description(self):
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return 'Upload'
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