def modify_formula(self):
index = self.listbox.curselection()
if len(index) != 1:
showerror('Error', 'Select one item')
else:
win = Toplevel(self)
win.title('Modify formula')
win.geometry('+100+100')
itemlabel = self.listbox.get(index)
products = Formula(itemlabel).get_formula(parent=win)
defaultnumproducts = 5
new = []
for i in range(defaultnumproducts):
if products:
var1 = makeFormRow(win, label='Enter the name of the product %d' % (i+1), input=products[0][0])
var2 = makeFormRow(win, label='Enter the name of the quantity', input=products[0][1])
new.append((var1, var2))
products.pop(0)
else:
var1 = makeFormRow(win, label='Enter the name of the product %d' % (i+1))
var2 = makeFormRow(win, label='Enter the name of the quantity')
new.append((var1, var2))
Button(win, text='OK', command=lambda: Formula(itemlabel).modify_formula(new, parent=win)).pack(side=LEFT, fill=X, expand=YES)
Button(win, text='Cancel', command=win.destroy).pack(side=RIGHT, fill=X, expand=YES)
win.bind('<Return>', lambda event: Formula(itemlabel).modify_formula(new, parent=win))
