The QIntValidator class provides a validator that ensures a string contains a valid integer within a specified range. 更多...
继承 QValidator .
The QIntValidator class provides a validator that ensures a string contains a valid integer within a specified range.
用法范例：
QValidator *validator = new QIntValidator(100, 999, this); QLineEdit *edit = new QLineEdit(this); // the edit lineedit will only accept integers between 100 and 999 edit->setValidator(validator);
Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.
QString str; int pos = 0; QIntValidator v(100, 900, this); str = "1"; v.validate(str, pos); // returns Intermediate str = "012"; v.validate(str, pos); // returns Intermediate str = "123"; v.validate(str, pos); // returns Acceptable str = "678"; v.validate(str, pos); // returns Acceptable str = "999"; v.validate(str, pos); // returns Intermediate str = "1234"; v.validate(str, pos); // returns Invalid str = "-123"; v.validate(str, pos); // returns Invalid str = "abc"; v.validate(str, pos); // returns Invalid str = "12cm"; v.validate(str, pos); // returns Invalid
Notice that the value 999 returns Intermediate. Values consisting of a number of digits equal to or less than the max value are considered intermediate. This is intended because the digit that prevents a number to be in range is not necessarily the last digit typed. This also means that an intermediate number can have leading zeros.
The minimum and maximum values are set in one call with setRange (), or individually with setBottom () 和 setTop ().
QIntValidator uses its locale () to interpret the number. For example, in Arabic locales, QIntValidator will accept Arabic digits. In addition, QIntValidator is always guaranteed to accept a number formatted according to the "C" locale.
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
构造验证器采用 parent object that accepts all integers.
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
构造验证器采用 parent , that accepts integers from minimum to maximum 包含在内。
重实现自 QValidator.fixup ().
Sets the range of the validator to only accept integers between bottom and top 包含在内。
重实现自 QValidator.validate ().
返回 Acceptable if the input is an integer within the valid range, 中间体 若 input is a prefix of an integer in the valid range, and Invalid 否则。
If the valid range consists of just positive integers (e.g., 32 to 100) and input is a negative integer, then Invalid is returned. (On the other hand, if the range consists of negative integers (e.g., -100 to -32) and input is a positive integer, then Intermediate is returned, because the user might be just about to type the minus (especially for right-to-left languages).
int pos = 0; s = "abc"; v.validate(s, pos); // returns Invalid s = "5"; v.validate(s, pos); // returns Intermediate s = "50"; v.validate(s, pos); // returns Acceptable
默认情况下， pos parameter is not used by this validator.
