class UnitInputDialog(QDialog):
"""Dialog to select new units. Checks compatibility while typing
and does not allow to continue if incompatible.
Returns None if cancelled.
:param units: current units.
:param parent: parent widget.
>>> new_units = UnitInputDialog.get_units('ms')
"""
def __init__(self, units, parent=None):
super().__init__(parent)
self.setupUi(parent)
self.units = units
self.source_units.setText(str(units))
def setupUi(self, parent):
self.resize(275, 172)
self.setWindowTitle('Convert units')
self.layout = QVBoxLayout(parent)
self.layout.setSizeConstraint(QLayout.SetFixedSize)
align = (Qt.AlignRight | Qt.AlignTrailing | Qt.AlignVCenter)
self.layout1 = QHBoxLayout()
self.label1 = QLabel()
self.label1.setMinimumSize(QSize(100, 0))
self.label1.setText('Convert from:')
self.label1.setAlignment(align)
self.layout1.addWidget(self.label1)
self.source_units = QLineEdit()
self.source_units.setReadOnly(True)
self.layout1.addWidget(self.source_units)
self.layout.addLayout(self.layout1)
self.layout2 = QHBoxLayout()
self.label2 = QLabel()
self.label2.setMinimumSize(QSize(100, 0))
self.label2.setText('to:')
self.label2.setAlignment(align)
self.layout2.addWidget(self.label2)
self.destination_units = QLineEdit()
self.layout2.addWidget(self.destination_units)
self.layout.addLayout(self.layout2)
self.message = QLabel()
self.message.setText('')
self.message.setAlignment(Qt.AlignCenter)
self.layout.addWidget(self.message)
self.buttonBox = QDialogButtonBox()
self.buttonBox.setOrientation(Qt.Horizontal)
self.buttonBox.setStandardButtons(QDialogButtonBox.Ok)
self.layout.addWidget(self.buttonBox)
self.buttonBox.setEnabled(False)
self.buttonBox.accepted.connect(self.accept)
self.destination_units.textChanged.connect(self.check)
self.setLayout(self.layout)
self.destination_units.setFocus()
def check(self):
units = self.destination_units.text().strip()
if not units:
return
try:
new_units = Q_(1, units)
factor = self.units.to(new_units).magnitude
except LookupError or SyntaxError:
self.message.setText('Cannot parse units')
self.buttonBox.setEnabled(False)
except ValueError:
self.message.setText('Incompatible units')
self.buttonBox.setEnabled(False)
else:
self.message.setText('factor {:f}'.format(factor))
self.buttonBox.setEnabled(True)
@staticmethod
def get_units(units):
"""Creates and display a UnitInputDialog and return new units.
Return None if the user cancelled.
"""
dialog = UnitInputDialog(Q_(1, units.units))
if dialog.exec_():
return dialog.destination_units.text()
return None
class UnitInputDialog(QDialog):
"""Dialog to select new units. Checks compatibility while typing
and does not allow to continue if incompatible.
Returns None if cancelled.
:param units: current units.
:param parent: parent widget.
>>> new_units = UnitInputDialog.get_units('ms')
"""
def __init__(self, units, parent=None):
super().__init__(parent)
self.setupUi(parent)
self.units = units
self.source_units.setText(str(units))
def setupUi(self, parent):
self.resize(275, 172)
self.setWindowTitle('Convert units')
self.layout = QVBoxLayout(parent)
self.layout.setSizeConstraint(QLayout.SetFixedSize)
align = (Qt.AlignRight | Qt.AlignTrailing | Qt.AlignVCenter)
self.layout1 = QHBoxLayout()
self.label1 = QLabel()
self.label1.setMinimumSize(QSize(100, 0))
self.label1.setText('Convert from:')
self.label1.setAlignment(align)
self.layout1.addWidget(self.label1)
self.source_units = QLineEdit()
self.source_units.setReadOnly(True)
self.layout1.addWidget(self.source_units)
self.layout.addLayout(self.layout1)
self.layout2 = QHBoxLayout()
self.label2 = QLabel()
self.label2.setMinimumSize(QSize(100, 0))
self.label2.setText('to:')
self.label2.setAlignment(align)
self.layout2.addWidget(self.label2)
self.destination_units = QLineEdit()
self.layout2.addWidget(self.destination_units)
self.layout.addLayout(self.layout2)
self.message = QLabel()
self.message.setText('')
self.message.setAlignment(Qt.AlignCenter)
self.layout.addWidget(self.message)
self.buttonBox = QDialogButtonBox()
self.buttonBox.setOrientation(Qt.Horizontal)
self.buttonBox.setStandardButtons(QDialogButtonBox.Ok)
self.layout.addWidget(self.buttonBox)
self.buttonBox.setEnabled(False)
self.buttonBox.accepted.connect(self.accept)
self.destination_units.textChanged.connect(self.check)
self.setLayout(self.layout)
self.destination_units.setFocus()
def check(self):
units = self.destination_units.text().strip()
if not units:
return
try:
new_units = Q_(1, units)
factor = self.units.to(new_units).magnitude
except LookupError or SyntaxError:
self.message.setText('Cannot parse units')
self.buttonBox.setEnabled(False)
except ValueError:
self.message.setText('Incompatible units')
self.buttonBox.setEnabled(False)
else:
self.message.setText('factor {:f}'.format(factor))
self.buttonBox.setEnabled(True)
@staticmethod
def get_units(units):
"""Creates and display a UnitInputDialog and return new units.
Return None if the user cancelled.
"""
dialog = UnitInputDialog(Q_(1, units.units))
if dialog.exec_():
return dialog.destination_units.text()
return None
