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"""ButtonWidget class.
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Represents a button in the frontend using a widget. Allows user to listen for
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click events on the button and trigger backend code when the clicks are fired.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2013, the IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import base64
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from .widget import Widget
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from IPython.utils.traitlets import Unicode, Bytes
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class ImageWidget(Widget):
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target_name = Unicode('ImageWidgetModel')
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default_view_name = Unicode('ImageView')
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# Define the custom state properties to sync with the front-end
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_keys = ['image_format', 'width', 'height', '_b64value']
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image_format = Unicode('png')
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width = Unicode()
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height = Unicode()
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_b64value = Unicode()
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value = Bytes()
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def _value_changed(self, name, old, new):
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self._b64value = base64.b64encode(new)
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