PyQt / PySide获取QSpinBOX中所选值的小数位

Question

How to query Decimal Place of selected value in QSpinBox(PyQt) ?

Let say QSpinBox contain value 631.1205 and user select 3 then answer should be tens.(ie 6=Hundreds, 3=Tens, 1=Ones, 1=Tenths, 2=Hundredths, 0=Thousandths, 5=Ten-Thousandths).

Answer 1

Let's assume you have two lists that contain the text you want to return (expand beyond thousand*s if appropriate for your use case): big = ['Ones', 'Tens', Hundreds', 'Thousands'] small = ['Tenths', 'Hundredths', 'Thousandths']

First you need to get a reference to the QLineEdit in the QSpinBox with:

line_edit = spinBox.findChild(QLineEdit)

Then find the index of where the selection starts:

selectionStart = line_edit.selectionStart()

Next find the index of the decimal point:

try:
    decimalPoint = str(line_edit.text()).index('.')
except ValueError:
    # no decimal point found so assume the number is an integer
    decimalPoint = len(str(line_edit.text()))

Then work out what you need to return:

# If something is selected
if selectionStart > -1:
    # if we have selected text starting on the left of the decimal
    if selectionStart < decimalPoint:
        return big[decimalPoint-selectionStart-1]
   # else we selected text starting on the right of the decimal
   else:
        return small[selectionStart-decimalPoint-1]

I'd recommend putting this in a function and calling it when appropriate as I have no context of what you are trying to do!