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# coding: utf-8
# /*##########################################################################
#
# Copyright (C) 2016-2018 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__license__ = "MIT"
__date__ = "03/01/2019"
import numpy
import numbers
import logging
import functools
from silx.gui import qt
from ..utils import units
_logger = logging.getLogger(__name__)
class QuantityLabel(qt.QLabel):
def __init__(self, parent=None):
qt.QLabel.__init__(self, parent)
self.__prefix = ""
self.__formatter = "{value}"
self.__floatFormatter = None
self.__value = None
self.__internalUnit = None
self.__displayedUnit = None
self.__isUnitEditable = False
self.__displayedUnitModel = None
self.__preferedSize = None
self.__elasticSize = False
def setInternalUnit(self, unit):
self.__internalUnit = unit
self.__updateText()
def setDisplayedUnitModel(self, model):
"""
Set the model containing an unit.
:param pyFAI.gui.model.DataUnit.DataUnit: Model containing
the unit.
"""
if self.__displayedUnitModel is not None:
self.__displayedUnitModel.changed.disconnect(self.__displayedUnitChanged)
self.__displayedUnitModel = model
if self.__displayedUnitModel is not None:
self.__displayedUnitModel.changed.connect(self.__displayedUnitChanged)
self.__displayedUnitChanged()
def getDisplayedUnitModel(self):
return self.__displayedUnitModel
def __displayedUnitChanged(self):
model = self.__displayedUnitModel
if model is None:
self.setDisplayedUnit(None)
else:
self.setDisplayedUnit(model.value())
def usedUnit(self):
"""Returns the unit used to display the quantity"""
if self.__displayedUnit is not None:
return self.__displayedUnit
else:
return self.__internalUnit
def setDisplayedUnit(self, unit):
self.__displayedUnit = unit
self.__updateText()
def setPrefix(self, prefix):
self.__prefix = prefix
self.__updateText()
def setFormatter(self, formatter):
self.__formatter = formatter
self.__updateText()
def setFloatFormatter(self, formatter):
"""Set a specific formatter for float.
If this formatter is None (default value) or the value is not a
floatting point, the default formatter is used.
"""
self.__floatFormatter = formatter
self.__updateText()
def setElasticSize(self, useElasticSize):
if self.__elasticSize == useElasticSize:
return
self.__elasticSize = useElasticSize
if self.__elasticSize is None:
self.__preferedSize = None
self.updateGeometry()
def sizeHint(self):
if self.__preferedSize is not None:
return self.__preferedSize
return qt.QLabel.sizeHint(self)
def setValue(self, value):
self.__value = value
self.__updateText()
def __updateText(self):
if self.__value is None:
text = "na"
else:
value = self.__value
if numpy.isscalar(value) and numpy.isnan(value):
text = "nan"
else:
currentUnit = self.usedUnit()
if currentUnit is not None:
symbol = currentUnit.symbol
else:
symbol = None
try:
value = units.convert(value, self.__internalUnit, currentUnit)
if isinstance(value, numbers.Real) and self.__floatFormatter is not None:
formatter = self.__floatFormatter
else:
formatter = self.__formatter
text = formatter.format(value=value)
if symbol is not None:
text = text + " " + symbol
except Exception as e:
_logger.error("Error while formating value: %s", e.args[0])
_logger.debug("Backtrace", exc_info=True)
text = "error"
text = self.__prefix + text
self.setText(text)
if self.__elasticSize:
size = self.size()
if self.__preferedSize is None or self.__preferedSize.width() < size.width():
self.__preferedSize = size
def __popupUnitSelection(self, pos):
"""Display a popup list to allow to select a new unit"""
currentUnit = self.usedUnit()
if currentUnit is None:
return
unitList = units.Unit.get_units(currentUnit.dimensionality)
if len(unitList) <= 1:
return
menu = qt.QMenu(self)
menu.addSection("Unit for %s" % currentUnit.dimensionality.fullname.lower())
for unit in unitList:
action = qt.QAction(menu)
text = "%s: %s" % (unit.fullname, unit.symbol)
if unit is currentUnit:
text += " (current)"
action.setText(text)
action.triggered.connect(functools.partial(self.__unitSelected, unit))
menu.addAction(action)
menu.popup(pos)
def __unitSelected(self, unit):
model = self.getDisplayedUnitModel()
if model is not None:
model.setValue(unit)
else:
self.setUnit(unit)
def mouseReleaseEvent(self, event):
if event.button() == qt.Qt.LeftButton and self.__isUnitEditable:
pos = event.pos()
pos = self.mapToGlobal(pos)
self.__popupUnitSelection(pos)
return
super(QuantityLabel, self).mouseReleaseEvent(event)
def setUnitEditable(self, isUnitEditable):
self.__isUnitEditable = isUnitEditable
def isUnitEditable(self):
return self.__isUnitEditable
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