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#****************************************************************************
# numedit.py, provides a number entry editor
#
# ConvertAll, a units conversion program
# Copyright (C) 2019, Douglas W. Bell
#
# This is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License, either Version 2 or any later
# version. This program is distributed in the hope that it will be useful,
# but WITTHOUT ANY WARRANTY. See the included LICENSE file for details.
#*****************************************************************************
import re
import sys
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtGui import QValidator
from PyQt5.QtWidgets import (QLineEdit, QMessageBox)
import unitdata
class NumEdit(QLineEdit):
"""Number entry editor.
"""
convertRqd = pyqtSignal()
convertNum = pyqtSignal(str)
gotFocus = pyqtSignal()
def __init__(self, thisUnit, otherUnit, label, status, recentUnits,
primary, parent=None):
super().__init__(parent)
self.thisUnit = thisUnit
self.otherUnit = otherUnit
self.label = label
self.status = status
self.recentUnits = recentUnits
self.primary = primary
self.onLeft = primary
self.setValidator(FloatExprValidator(self))
self.setText(self.thisUnit.formatNumStr(1.0))
self.textEdited.connect(self.convert)
def unitUpdate(self):
"""Update the editor and labels based on a unit change.
"""
if self.thisUnit.groupValid():
self.label.setText(self.thisUnit.unitString())
if self.otherUnit.groupValid():
try:
self.thisUnit.reduceGroup()
self.otherUnit.reduceGroup()
except unitdata.UnitDataError as text:
QMessageBox.warning(self, 'ConvertAll',
_('Error in unit data - {0}').
format(text))
return
if self.thisUnit.categoryMatch(self.otherUnit):
self.status.setText(_('Converting...'))
if self.primary:
self.convert()
else:
self.convertRqd.emit()
return
if self.onLeft:
self.status.setText(_('Units are not compatible '
'({0} vs. {1})').
format(self.thisUnit.compatStr(),
self.otherUnit.compatStr()))
else:
self.status.setText(_('Units are not compatible '
'({0} vs. {1})').
format(self.otherUnit.compatStr(),
self.thisUnit.compatStr()))
else:
self.status.setText(_('Set units'))
else:
self.status.setText(_('Set units'))
self.label.setText(_('No Unit Set'))
self.setEnabled(False)
self.convertNum.emit('')
def convert(self):
"""Do conversion with self primary.
"""
self.primary = True
self.setEnabled(True)
if self.onLeft:
self.recentUnits.addEntry(self.otherUnit.unitString())
self.recentUnits.addEntry(self.thisUnit.unitString())
else:
self.recentUnits.addEntry(self.thisUnit.unitString())
self.recentUnits.addEntry(self.otherUnit.unitString())
try:
num = float(eval(self.text()))
except:
self.convertNum.emit('')
return
try:
numText = self.thisUnit.convertStr(num, self.otherUnit)
self.convertNum.emit(numText)
except unitdata.UnitDataError as text:
QMessageBox.warning(self, 'ConvertAll',
_('Error in unit data - {0}').
format(text))
def setNum(self, numText):
"""Set text based on conversion from other number editor.
"""
if not numText:
self.setEnabled(False)
else:
self.primary = False
self.setEnabled(True)
self.setText(numText)
def focusInEvent(self, event):
"""Signal that this number editor received focus.
"""
super().focusInEvent(event)
self.gotFocus.emit()
class FloatExprValidator(QValidator):
"""Validator for float python expressions typed into NumEdit.
"""
invalidRe = re.compile(r'[^\d\.eE\+\-\*/\(\) ]')
def __init__(self, parent):
super().__init__(parent)
def validate(self, inputStr, pos):
"""Check for valid characters in entry.
"""
if FloatExprValidator.invalidRe.search(inputStr):
return (QValidator.Invalid, inputStr, pos)
return (QValidator.Acceptable, inputStr, pos)
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