Default to 25-75% of min-max if no value is set instead of 0-1

IPython/html/widgets/widget_float.py

@@ -1,93 +1,97
 """FloatWidget 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
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 class _FloatWidget(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 _BoundedFloatWidget(_FloatWidget):
     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 FloatTextWidget(_FloatWidget):
     _view_name = Unicode('FloatTextView', sync=True)
 
 
 class BoundedFloatTextWidget(_BoundedFloatWidget):
     _view_name = Unicode('FloatTextView', sync=True)
 
 
 class FloatSliderWidget(_BoundedFloatWidget):
     _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)
 
 
 class FloatProgressWidget(_BoundedFloatWidget):
     _view_name = Unicode('ProgressView', sync=True)
 
 class _FloatRangeWidget(_FloatWidget):
     value = Tuple(CFloat, CFloat, default_value=(0.0, 1.0), help="Low and high float values", sync=True)
 
 class _BoundedFloatRangeWidget(_FloatRangeWidget):
     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):
-        """Constructor"""
+        set_value = 'value' not in kwargs
         DOMWidget.__init__(self, *pargs, **kwargs)
+        if set_value:
+            # if no value is set, use 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)
         self.on_trait_change(self._validate, ['value', 'min', 'max'])
 
     def _validate(self, name, old, new):
         """Validate min <= low <= high <= max"""
         if name == "value":
             low, high = new
         else:
             low, high = self.value
         low = max(low, self.min)
         high = min(high, self.max)
         self.value = (min(low, high), max(low, high))
 
 
 class FloatRangeSliderWidget(_BoundedFloatRangeWidget):
     _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)

IPython/html/widgets/widget_int.py

@@ -1,92 +1,96
 """IntWidget class.
 
 Represents an unbounded int 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, CInt, Bool, Enum, Tuple
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 class _IntWidget(DOMWidget):
     value = CInt(0, help="Int 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 _BoundedIntWidget(_IntWidget):
     step = CInt(1, help="Minimum step that the value can take (ignored by some views)", sync=True)
     max = CInt(100, help="Max value", sync=True)
     min = CInt(0, help="Min value", sync=True)
 
     def __init__(self, *pargs, **kwargs):
         """Constructor"""
         DOMWidget.__init__(self, *pargs, **kwargs)
         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 IntTextWidget(_IntWidget):
     _view_name = Unicode('IntTextView', sync=True)
 
 
 class BoundedIntTextWidget(_BoundedIntWidget):
     _view_name = Unicode('IntTextView', sync=True)
 
 
 class IntSliderWidget(_BoundedIntWidget):
     _view_name = Unicode('IntSliderView', 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)
 
 
 class IntProgressWidget(_BoundedIntWidget):
     _view_name = Unicode('ProgressView', sync=True)
 
 class _IntRangeWidget(_IntWidget):
     value = Tuple(CInt, CInt, default_value=(0, 1), help="Low and high int values", sync=True)
 
 class _BoundedIntRangeWidget(_IntRangeWidget):
     step = CInt(1, help="Minimum step that the value can take (ignored by some views)", sync=True)
     max = CInt(100, help="Max value", sync=True)
     min = CInt(0, help="Min value", sync=True)
 
     def __init__(self, *pargs, **kwargs):
-        """Constructor"""
+        set_value = 'value' not in kwargs
         DOMWidget.__init__(self, *pargs, **kwargs)
+        if set_value:
+            # if no value is set, use 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)
         self.on_trait_change(self._validate, ['value', 'min', 'max'])
 
     def _validate(self, name, old, new):
         """Validate min <= low <= high <= max"""
         if name == "value":
             low, high = new
         else:
             low, high = self.value
         low = max(low, self.min)
         high = min(high, self.max)
         self.value = (min(low, high), max(low, high))
 
 
 class IntRangeSliderWidget(_BoundedIntRangeWidget):
     _view_name = Unicode('IntSliderView', 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)