355 lines
14 KiB
Python
355 lines
14 KiB
Python
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"""Float class.
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Represents an unbounded float using a widget.
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"""
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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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from traitlets import (
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Instance, Unicode, CFloat, Bool, CaselessStrEnum, Tuple, TraitError, validate, default
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)
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from .widget_description import DescriptionWidget
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from .trait_types import InstanceDict, NumberFormat
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from .valuewidget import ValueWidget
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from .widget import register, widget_serialization
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from .widget_core import CoreWidget
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from .widget_int import ProgressStyle, SliderStyle
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class _Float(DescriptionWidget, ValueWidget, CoreWidget):
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value = CFloat(0.0, help="Float value").tag(sync=True)
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def __init__(self, value=None, **kwargs):
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if value is not None:
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kwargs['value'] = value
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super(_Float, self).__init__(**kwargs)
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class _BoundedFloat(_Float):
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max = CFloat(100.0, help="Max value").tag(sync=True)
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min = CFloat(0.0, help="Min value").tag(sync=True)
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@validate('value')
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def _validate_value(self, proposal):
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"""Cap and floor value"""
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value = proposal['value']
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if self.min > value or self.max < value:
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value = min(max(value, self.min), self.max)
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return value
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@validate('min')
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def _validate_min(self, proposal):
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"""Enforce min <= value <= max"""
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min = proposal['value']
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if min > self.max:
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raise TraitError('Setting min > max')
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if min > self.value:
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self.value = min
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return min
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@validate('max')
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def _validate_max(self, proposal):
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"""Enforce min <= value <= max"""
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max = proposal['value']
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if max < self.min:
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raise TraitError('setting max < min')
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if max < self.value:
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self.value = max
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return max
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class _BoundedLogFloat(_Float):
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max = CFloat(4.0, help="Max value for the exponent").tag(sync=True)
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min = CFloat(0.0, help="Min value for the exponent").tag(sync=True)
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base = CFloat(10.0, help="Base of value").tag(sync=True)
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value = CFloat(1.0, help="Float value").tag(sync=True)
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@validate('value')
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def _validate_value(self, proposal):
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"""Cap and floor value"""
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value = proposal['value']
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if self.base ** self.min > value or self.base ** self.max < value:
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value = min(max(value, self.base ** self.min), self.base ** self.max)
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return value
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@validate('min')
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def _validate_min(self, proposal):
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"""Enforce base ** min <= value <= base ** max"""
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min = proposal['value']
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if min > self.max:
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raise TraitError('Setting min > max')
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if self.base ** min > self.value:
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self.value = self.base ** min
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return min
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@validate('max')
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def _validate_max(self, proposal):
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"""Enforce base ** min <= value <= base ** max"""
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max = proposal['value']
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if max < self.min:
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raise TraitError('setting max < min')
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if self.base ** max < self.value:
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self.value = self.base ** max
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return max
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@register
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class FloatText(_Float):
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""" Displays a float value within a textbox. For a textbox in
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which the value must be within a specific range, use BoundedFloatText.
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Parameters
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----------
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value : float
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value displayed
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step : float
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step of the increment (if None, any step is allowed)
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description : str
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description displayed next to the text box
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"""
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_view_name = Unicode('FloatTextView').tag(sync=True)
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_model_name = Unicode('FloatTextModel').tag(sync=True)
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disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
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continuous_update = Bool(False, help="Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.").tag(sync=True)
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step = CFloat(None, allow_none=True, help="Minimum step to increment the value").tag(sync=True)
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@register
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class BoundedFloatText(_BoundedFloat):
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""" Displays a float value within a textbox. Value must be within the range specified.
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For a textbox in which the value doesn't need to be within a specific range, use FloatText.
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Parameters
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----------
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value : float
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value displayed
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min : float
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minimal value of the range of possible values displayed
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max : float
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maximal value of the range of possible values displayed
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step : float
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step of the increment (if None, any step is allowed)
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description : str
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description displayed next to the textbox
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"""
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_view_name = Unicode('FloatTextView').tag(sync=True)
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_model_name = Unicode('BoundedFloatTextModel').tag(sync=True)
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disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
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continuous_update = Bool(False, help="Update the value as the user types. If False, update on submission, e.g., pressing Enter or navigating away.").tag(sync=True)
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step = CFloat(None, allow_none=True, help="Minimum step to increment the value").tag(sync=True)
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@register
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class FloatSlider(_BoundedFloat):
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""" Slider/trackbar of floating values with the specified range.
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Parameters
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----------
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value : float
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position of the slider
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min : float
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minimal position of the slider
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max : float
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maximal position of the slider
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step : float
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step of the trackbar
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description : str
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name of the slider
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orientation : {'horizontal', 'vertical'}
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default is 'horizontal', orientation of the slider
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readout : {True, False}
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default is True, display the current value of the slider next to it
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readout_format : str
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default is '.2f', specifier for the format function used to represent
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slider value for human consumption, modeled after Python 3's format
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specification mini-language (PEP 3101).
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"""
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_view_name = Unicode('FloatSliderView').tag(sync=True)
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_model_name = Unicode('FloatSliderModel').tag(sync=True)
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step = CFloat(0.1, help="Minimum step to increment the value").tag(sync=True)
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orientation = CaselessStrEnum(values=['horizontal', 'vertical'],
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default_value='horizontal', help="Vertical or horizontal.").tag(sync=True)
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readout = Bool(True, help="Display the current value of the slider next to it.").tag(sync=True)
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readout_format = NumberFormat(
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'.2f', help="Format for the readout").tag(sync=True)
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continuous_update = Bool(True, help="Update the value of the widget as the user is holding the slider.").tag(sync=True)
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disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
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style = InstanceDict(SliderStyle).tag(sync=True, **widget_serialization)
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@register
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class FloatLogSlider(_BoundedLogFloat):
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""" Slider/trackbar of logarithmic floating values with the specified range.
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Parameters
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----------
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value : float
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position of the slider
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base : float
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base of the logarithmic scale. Default is 10
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min : float
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minimal position of the slider in log scale, i.e., actual minimum is base ** min
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max : float
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maximal position of the slider in log scale, i.e., actual maximum is base ** max
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step : float
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step of the trackbar, denotes steps for the exponent, not the actual value
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description : str
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name of the slider
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orientation : {'horizontal', 'vertical'}
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default is 'horizontal', orientation of the slider
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readout : {True, False}
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default is True, display the current value of the slider next to it
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readout_format : str
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default is '.3g', specifier for the format function used to represent
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slider value for human consumption, modeled after Python 3's format
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specification mini-language (PEP 3101).
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"""
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_view_name = Unicode('FloatLogSliderView').tag(sync=True)
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_model_name = Unicode('FloatLogSliderModel').tag(sync=True)
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step = CFloat(0.1, help="Minimum step in the exponent to increment the value").tag(sync=True)
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orientation = CaselessStrEnum(values=['horizontal', 'vertical'],
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default_value='horizontal', help="Vertical or horizontal.").tag(sync=True)
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readout = Bool(True, help="Display the current value of the slider next to it.").tag(sync=True)
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readout_format = NumberFormat(
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'.3g', help="Format for the readout").tag(sync=True)
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continuous_update = Bool(True, help="Update the value of the widget as the user is holding the slider.").tag(sync=True)
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disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
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base = CFloat(10., help="Base for the logarithm").tag(sync=True)
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style = InstanceDict(SliderStyle).tag(sync=True, **widget_serialization)
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@register
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class FloatProgress(_BoundedFloat):
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""" Displays a progress bar.
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Parameters
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-----------
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value : float
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position within the range of the progress bar
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min : float
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minimal position of the slider
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max : float
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maximal position of the slider
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description : str
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name of the progress bar
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orientation : {'horizontal', 'vertical'}
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default is 'horizontal', orientation of the progress bar
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bar_style: {'success', 'info', 'warning', 'danger', ''}
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color of the progress bar, default is '' (blue)
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colors are: 'success'-green, 'info'-light blue, 'warning'-orange, 'danger'-red
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"""
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_view_name = Unicode('ProgressView').tag(sync=True)
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_model_name = Unicode('FloatProgressModel').tag(sync=True)
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orientation = CaselessStrEnum(values=['horizontal', 'vertical'],
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default_value='horizontal', help="Vertical or horizontal.").tag(sync=True)
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bar_style = CaselessStrEnum(
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values=['success', 'info', 'warning', 'danger', ''],
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default_value='', allow_none=True,
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help="Use a predefined styling for the progess bar.").tag(sync=True)
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style = InstanceDict(ProgressStyle).tag(sync=True, **widget_serialization)
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class _FloatRange(_Float):
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value = Tuple(CFloat(), CFloat(), default_value=(0.0, 1.0),
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help="Tuple of (lower, upper) bounds").tag(sync=True)
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@property
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def lower(self):
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return self.value[0]
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@lower.setter
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def lower(self, lower):
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self.value = (lower, self.value[1])
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@property
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def upper(self):
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return self.value[1]
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@upper.setter
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def upper(self, upper):
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self.value = (self.value[0], upper)
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@validate('value')
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def _validate_value(self, proposal):
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lower, upper = proposal['value']
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if upper < lower:
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raise TraitError('setting lower > upper')
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return lower, upper
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class _BoundedFloatRange(_FloatRange):
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step = CFloat(1.0, help="Minimum step that the value can take (ignored by some views)").tag(sync=True)
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max = CFloat(100.0, help="Max value").tag(sync=True)
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min = CFloat(0.0, help="Min value").tag(sync=True)
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def __init__(self, *args, **kwargs):
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min, max = kwargs.get('min', 0.0), kwargs.get('max', 100.0)
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if kwargs.get('value', None) is None:
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kwargs['value'] = (0.75 * min + 0.25 * max,
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0.25 * min + 0.75 * max)
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super(_BoundedFloatRange, self).__init__(*args, **kwargs)
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@validate('min', 'max')
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def _validate_bounds(self, proposal):
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trait = proposal['trait']
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new = proposal['value']
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if trait.name == 'min' and new > self.max:
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raise TraitError('setting min > max')
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if trait.name == 'max' and new < self.min:
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raise TraitError('setting max < min')
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if trait.name == 'min':
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self.value = (max(new, self.value[0]), max(new, self.value[1]))
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if trait.name == 'max':
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self.value = (min(new, self.value[0]), min(new, self.value[1]))
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return new
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@validate('value')
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def _validate_value(self, proposal):
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lower, upper = super(_BoundedFloatRange, self)._validate_value(proposal)
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lower, upper = min(lower, self.max), min(upper, self.max)
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lower, upper = max(lower, self.min), max(upper, self.min)
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return lower, upper
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@register
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class FloatRangeSlider(_BoundedFloatRange):
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""" Slider/trackbar that represents a pair of floats bounded by minimum and maximum value.
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Parameters
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----------
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value : float tuple
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range of the slider displayed
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min : float
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minimal position of the slider
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max : float
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maximal position of the slider
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step : float
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step of the trackbar
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description : str
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name of the slider
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orientation : {'horizontal', 'vertical'}
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default is 'horizontal'
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readout : {True, False}
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default is True, display the current value of the slider next to it
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readout_format : str
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default is '.2f', specifier for the format function used to represent
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slider value for human consumption, modeled after Python 3's format
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specification mini-language (PEP 3101).
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"""
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_view_name = Unicode('FloatRangeSliderView').tag(sync=True)
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_model_name = Unicode('FloatRangeSliderModel').tag(sync=True)
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step = CFloat(0.1, help="Minimum step to increment the value").tag(sync=True)
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orientation = CaselessStrEnum(values=['horizontal', 'vertical'],
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default_value='horizontal', help="Vertical or horizontal.").tag(sync=True)
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readout = Bool(True, help="Display the current value of the slider next to it.").tag(sync=True)
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readout_format = NumberFormat(
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'.2f', help="Format for the readout").tag(sync=True)
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continuous_update = Bool(True, help="Update the value of the widget as the user is sliding the slider.").tag(sync=True)
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disabled = Bool(False, help="Enable or disable user changes").tag(sync=True)
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style = InstanceDict(SliderStyle).tag(sync=True, **widget_serialization)
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