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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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#-----------------------------------------------------------------------------
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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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from .widget import DOMWidget
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from IPython.utils.traitlets import Unicode, CFloat, Bool, CaselessStrEnum, Tuple
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from IPython.utils.warn import DeprecatedClass
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class _Float(DOMWidget):
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value = CFloat(0.0, help="Float value", sync=True)
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disabled = Bool(False, help="Enable or disable user changes", sync=True)
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description = Unicode(help="Description of the value this widget represents", sync=True)
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class _BoundedFloat(_Float):
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max = CFloat(100.0, help="Max value", sync=True)
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min = CFloat(0.0, help="Min value", sync=True)
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step = CFloat(0.1, help="Minimum step that the value can take (ignored by some views)", sync=True)
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def __init__(self, *pargs, **kwargs):
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"""Constructor"""
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DOMWidget.__init__(self, *pargs, **kwargs)
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self._validate('value', None, self.value)
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self.on_trait_change(self._validate, ['value', 'min', 'max'])
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def _validate(self, name, old, new):
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"""Validate value, max, min."""
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if self.min > new or new > self.max:
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self.value = min(max(new, self.min), self.max)
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class FloatText(_Float):
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_view_name = Unicode('FloatTextView', sync=True)
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class BoundedFloatText(_BoundedFloat):
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_view_name = Unicode('FloatTextView', sync=True)
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class FloatSlider(_BoundedFloat):
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_view_name = Unicode('FloatSliderView', sync=True)
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orientation = CaselessStrEnum(values=['horizontal', 'vertical'],
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default_value='horizontal',
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help="Vertical or horizontal.", allow_none=False, sync=True)
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_range = Bool(False, help="Display a range selector", sync=True)
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readout = Bool(True, help="Display the current value of the slider next to it.", sync=True)
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slider_color = Unicode(sync=True)
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class FloatProgress(_BoundedFloat):
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_view_name = Unicode('ProgressView', 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, sync=True, help="""Use a
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predefined styling for the progess bar.""")
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class _FloatRange(_Float):
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value = Tuple(CFloat, CFloat, default_value=(0.0, 1.0), help="Tuple of (lower, upper) bounds", sync=True)
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lower = CFloat(0.0, help="Lower bound", sync=False)
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upper = CFloat(1.0, help="Upper bound", sync=False)
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def __init__(self, *pargs, **kwargs):
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value_given = 'value' in kwargs
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lower_given = 'lower' in kwargs
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upper_given = 'upper' in kwargs
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if value_given and (lower_given or upper_given):
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raise ValueError("Cannot specify both 'value' and 'lower'/'upper' for range widget")
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if lower_given != upper_given:
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raise ValueError("Must specify both 'lower' and 'upper' for range widget")
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DOMWidget.__init__(self, *pargs, **kwargs)
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# ensure the traits match, preferring whichever (if any) was given in kwargs
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if value_given:
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self.lower, self.upper = self.value
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else:
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self.value = (self.lower, self.upper)
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self.on_trait_change(self._validate, ['value', 'upper', 'lower'])
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def _validate(self, name, old, new):
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if name == 'value':
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self.lower, self.upper = min(new), max(new)
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elif name == 'lower':
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self.value = (new, self.value[1])
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elif name == 'upper':
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self.value = (self.value[0], new)
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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)", sync=True)
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max = CFloat(100.0, help="Max value", sync=True)
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min = CFloat(0.0, help="Min value", sync=True)
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def __init__(self, *pargs, **kwargs):
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any_value_given = 'value' in kwargs or 'upper' in kwargs or 'lower' in kwargs
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_FloatRange.__init__(self, *pargs, **kwargs)
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# ensure a minimal amount of sanity
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if self.min > self.max:
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raise ValueError("min must be <= max")
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if any_value_given:
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# if a value was given, clamp it within (min, max)
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self._validate("value", None, self.value)
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else:
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# otherwise, set it to 25-75% to avoid the handles overlapping
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self.value = (0.75*self.min + 0.25*self.max,
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0.25*self.min + 0.75*self.max)
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# callback already set for 'value', 'lower', 'upper'
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self.on_trait_change(self._validate, ['min', 'max'])
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def _validate(self, name, old, new):
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if name == "min":
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if new > self.max:
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raise ValueError("setting min > max")
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self.min = new
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elif name == "max":
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if new < self.min:
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raise ValueError("setting max < min")
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self.max = new
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low, high = self.value
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if name == "value":
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low, high = min(new), max(new)
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elif name == "upper":
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if new < self.lower:
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raise ValueError("setting upper < lower")
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high = new
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elif name == "lower":
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if new > self.upper:
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raise ValueError("setting lower > upper")
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low = new
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low = max(self.min, min(low, self.max))
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high = min(self.max, max(high, self.min))
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# determine the order in which we should update the
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# lower, upper traits to avoid a temporary inverted overlap
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lower_first = high < self.lower
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self.value = (low, high)
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if lower_first:
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self.lower = low
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self.upper = high
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else:
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self.upper = high
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self.lower = low
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class FloatRangeSlider(_BoundedFloatRange):
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_view_name = Unicode('FloatSliderView', sync=True)
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orientation = CaselessStrEnum(values=['horizontal', 'vertical'],
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default_value='horizontal', allow_none=False,
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help="Vertical or horizontal.", sync=True)
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_range = Bool(True, help="Display a range selector", sync=True)
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readout = Bool(True, help="Display the current value of the slider next to it.", sync=True)
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slider_color = Unicode(sync=True)
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# Remove in IPython 4.0
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FloatTextWidget = DeprecatedClass(FloatText, 'FloatTextWidget')
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BoundedFloatTextWidget = DeprecatedClass(BoundedFloatText, 'BoundedFloatTextWidget')
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FloatSliderWidget = DeprecatedClass(FloatSlider, 'FloatSliderWidget')
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FloatProgressWidget = DeprecatedClass(FloatProgress, 'FloatProgressWidget')
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