"""Float class. Represents an unbounded float using a widget. """ #----------------------------------------------------------------------------- # Copyright (c) 2013, the IPython Development Team. # # Distributed under the terms of the Modified BSD License. # # The full license is in the file COPYING.txt, distributed with this software. #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- from .widget import DOMWidget from IPython.utils.traitlets import Unicode, CFloat, Bool, Enum, Tuple from IPython.utils.warn import DeprecatedClass #----------------------------------------------------------------------------- # Classes #----------------------------------------------------------------------------- class _Float(DOMWidget): value = CFloat(0.0, help="Float value", sync=True) disabled = Bool(False, help="Enable or disable user changes", sync=True) description = Unicode(help="Description of the value this widget represents", sync=True) class _BoundedFloat(_Float): max = CFloat(100.0, help="Max value", sync=True) min = CFloat(0.0, help="Min value", sync=True) step = CFloat(0.1, help="Minimum step that the value can take (ignored by some views)", sync=True) def __init__(self, *pargs, **kwargs): """Constructor""" DOMWidget.__init__(self, *pargs, **kwargs) self._validate('value', None, self.value) self.on_trait_change(self._validate, ['value', 'min', 'max']) def _validate(self, name, old, new): """Validate value, max, min.""" if self.min > new or new > self.max: self.value = min(max(new, self.min), self.max) class FloatText(_Float): _view_name = Unicode('FloatTextView', sync=True) class BoundedFloatText(_BoundedFloat): _view_name = Unicode('FloatTextView', sync=True) class FloatSlider(_BoundedFloat): _view_name = Unicode('FloatSliderView', sync=True) orientation = Enum([u'horizontal', u'vertical'], u'horizontal', help="Vertical or horizontal.", sync=True) _range = Bool(False, help="Display a range selector", sync=True) readout = Bool(True, help="Display the current value of the slider next to it.", sync=True) slider_color = Unicode(sync=True) class FloatProgress(_BoundedFloat): _view_name = Unicode('ProgressView', sync=True) class _FloatRange(_Float): value = Tuple(CFloat, CFloat, default_value=(0.0, 1.0), help="Tuple of (lower, upper) bounds", sync=True) lower = CFloat(0.0, help="Lower bound", sync=False) upper = CFloat(1.0, help="Upper bound", sync=False) def __init__(self, *pargs, **kwargs): value_given = 'value' in kwargs lower_given = 'lower' in kwargs upper_given = 'upper' in kwargs if value_given and (lower_given or upper_given): raise ValueError("Cannot specify both 'value' and 'lower'/'upper' for range widget") if lower_given != upper_given: raise ValueError("Must specify both 'lower' and 'upper' for range widget") DOMWidget.__init__(self, *pargs, **kwargs) # ensure the traits match, preferring whichever (if any) was given in kwargs if value_given: self.lower, self.upper = self.value else: self.value = (self.lower, self.upper) self.on_trait_change(self._validate, ['value', 'upper', 'lower']) def _validate(self, name, old, new): if name == 'value': self.lower, self.upper = min(new), max(new) elif name == 'lower': self.value = (new, self.value[1]) elif name == 'upper': self.value = (self.value[0], new) class _BoundedFloatRange(_FloatRange): step = CFloat(1.0, help="Minimum step that the value can take (ignored by some views)", sync=True) max = CFloat(100.0, help="Max value", sync=True) min = CFloat(0.0, help="Min value", sync=True) def __init__(self, *pargs, **kwargs): any_value_given = 'value' in kwargs or 'upper' in kwargs or 'lower' in kwargs _FloatRange.__init__(self, *pargs, **kwargs) # ensure a minimal amount of sanity if self.min > self.max: raise ValueError("min must be <= max") if any_value_given: # if a value was given, clamp it within (min, max) self._validate("value", None, self.value) else: # otherwise, set it to 25-75% to avoid the handles overlapping self.value = (0.75*self.min + 0.25*self.max, 0.25*self.min + 0.75*self.max) # callback already set for 'value', 'lower', 'upper' self.on_trait_change(self._validate, ['min', 'max']) def _validate(self, name, old, new): if name == "min": if new > self.max: raise ValueError("setting min > max") self.min = new elif name == "max": if new < self.min: raise ValueError("setting max < min") self.max = new low, high = self.value if name == "value": low, high = min(new), max(new) elif name == "upper": if new < self.lower: raise ValueError("setting upper < lower") high = new elif name == "lower": if new > self.upper: raise ValueError("setting lower > upper") low = new low = max(self.min, min(low, self.max)) high = min(self.max, max(high, self.min)) # determine the order in which we should update the # lower, upper traits to avoid a temporary inverted overlap lower_first = high < self.lower self.value = (low, high) if lower_first: self.lower = low self.upper = high else: self.upper = high self.lower = low class FloatRangeSlider(_BoundedFloatRange): _view_name = Unicode('FloatSliderView', sync=True) orientation = Enum([u'horizontal', u'vertical'], u'horizontal', help="Vertical or horizontal.", sync=True) _range = Bool(True, help="Display a range selector", sync=True) readout = Bool(True, help="Display the current value of the slider next to it.", sync=True) # Remove in IPython 4.0 FloatTextWidget = DeprecatedClass(FloatText, 'FloatTextWidget') BoundedFloatTextWidget = DeprecatedClass(BoundedFloatText, 'BoundedFloatTextWidget') FloatSliderWidget = DeprecatedClass(FloatSlider, 'FloatSliderWidget') FloatProgressWidget = DeprecatedClass(FloatProgress, 'FloatProgressWidget')