def calculate(self, event):
"""
Calculate the mass Density/molar Volume of the molecules
"""
self.clear_outputs()
try:
#Check validity user inputs
flag, msg = self.check_inputs()
if self.base is not None and msg.lstrip().rstrip() != "":
msg = "Density/Volume Calculator: %s" % str(msg)
wx.PostEvent(self.base, StatusEvent(status=msg))
if not flag:
return
#get ready to compute
mol_formula = Formula(self.compound)
molar_mass = float(mol_formula.molecular_mass) * AVOGADRO
output = self._format_number(molar_mass / self.input)
self.molar_mass_ctl.SetValue(str(self._format_number(molar_mass)))
self.output_ctl.SetValue(str(output))
except Exception as exc:
if self.base is not None:
msg = "Density/Volume Calculator: %s" % exc
wx.PostEvent(self.base, StatusEvent(status=msg))
if event is not None:
event.Skip()
def check_inputs(self):
"""
Check validity user inputs
"""
flag = True
msg = ""
if check_float(self.input_ctl):
self.input = float(self.input_ctl.GetValue())
else:
flag = False
input_type = str(self.input_cb.GetValue())
msg += "Error for %s value :expect float" % input_type
self.compound = self.compound_ctl.GetValue().lstrip().rstrip()
if self.compound != "":
try:
Formula(self.compound)
self.compound_ctl.SetBackgroundColour(wx.WHITE)
self.compound_ctl.Refresh()
except:
self.compound_ctl.SetBackgroundColour("pink")
self.compound_ctl.Refresh()
flag = False
msg += "Enter correct formula"
else:
self.compound_ctl.SetBackgroundColour("pink")
self.compound_ctl.Refresh()
flag = False
msg += "Enter Formula"
return flag, msg