How to restrict QSpinBox value to 1 to 100?
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I have the feeling, we had this question recently 🤔
@Sriu1
if you really want to restrict the input of leading 0's you probably will have to do this yourself by, for example, overwriting QAbstractSpinBox::validate@J.Hilk
A while back I posted (https://forum.qt.io/topic/85305/validation-behaviour-too-confusing-for-end-user) how I feel so unfamiliar about the way Qt validators work when typing into a line edit, which would apply to a spin box's edit too.For example, if your validator does indeed forbid a leading 0:
- Type a
6. - Type a
0. - You realize you meant
50rather than60. - So you try to delete the leading
6, to then type in a5. - But you can't! As you delete the leading
6, the number now starts with a0, so the validator prevents the delete. The user gets no feedback as to why. - To achieve the change, the user must first delete the
0, followed by the6, before he can then type in50.
This is most unnatural, and regrettably my users are so confused I had to remove the validator.... So OP beware!
- Type a
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@KillerSmath
How would your regexp allow a value like, say,23? How would it prevent, say,999?@JonB said in How to restrict QSpinBox value to 1 to 100?:
@KillerSmath
How would your regexp allow a value like, say,23? How would it prevent, say,999?I just said a hypothetical example.
@Computer Science Student - Brazil
Web Developer and Researcher
“Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.” - Alan Turing -
@JonB said in How to restrict QSpinBox value to 1 to 100?:
@KillerSmath
How would your regexp allow a value like, say,23? How would it prevent, say,999?I just said a hypothetical example.
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@KillerSmath
Oh, OK, some posters here will type in whatever you offer and then complain if it doesn't work as-is!@JonB said in How to restrict QSpinBox value to 1 to 100?:
@KillerSmath
Oh, OK, some posters here will type in whatever you offer and then complain if it doesn't work as-is!an easy mode to write this regular expression is
0|100|[1-9][0-9]?@Computer Science Student - Brazil
Web Developer and Researcher
“Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.” - Alan Turing -
@JonB said in How to restrict QSpinBox value to 1 to 100?:
@KillerSmath
Oh, OK, some posters here will type in whatever you offer and then complain if it doesn't work as-is!an easy mode to write this regular expression is
0|100|[1-9][0-9]? -
@KillerSmath
Yep. For completeness, since the OP states he wants to disallow0, if he wants to copy this it should be100|[1-9][0-9]?.@JonB said in How to restrict QSpinBox value to 1 to 100?:
@KillerSmath
Yep. For completeness, since the OP states he wants to disallow0, if he wants to copy this it should be100|[1-9][0-9]?.Yep, thank you, i forgot this part. xD
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To be correct:
^[1-9][0-9]?$|^100$. Otherwise you'll be matching "numbers in numbers"Interested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
@SGaist said in How to restrict QSpinBox value to 1 to 100?:
To be correct:
^[1-9][0-9]?$|^100$. Otherwise you'll be matching "numbers in numbers"Yes, use the delimiters to apply this regular expression on full string.
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To be correct:
^[1-9][0-9]?$|^100$. Otherwise you'll be matching "numbers in numbers"But for
QAbstractSpinBox::validate()I assume it uses http://doc.qt.io/qt-5/qregularexpressionvalidator.html#details, which states:QRegularExpressionValidator automatically wraps the regular expression in the \A and \z anchors; in other words, it always attempts to do an exact match.
?
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To be correct:
^[1-9][0-9]?$|^100$. Otherwise you'll be matching "numbers in numbers"But for
QAbstractSpinBox::validate()I assume it uses http://doc.qt.io/qt-5/qregularexpressionvalidator.html#details, which states:QRegularExpressionValidator automatically wraps the regular expression in the \A and \z anchors; in other words, it always attempts to do an exact match.
?
@JonB said in How to restrict QSpinBox value to 1 to 100?:
To be correct:
^[1-9][0-9]?$|^100$. Otherwise you'll be matching "numbers in numbers"But for
QAbstractSpinBox::validate()I assume it uses http://doc.qt.io/qt-5/qregularexpressionvalidator.html#details, which states:QRegularExpressionValidator automatically wraps the regular expression in the \A and \z anchors; in other words, it always attempts to do an exact match.
?
Yes, i found the Qt reposity and i noticed
QAbstractSpinBox::validate()returns for defaultQValidator::Acceptablewithout verification.if the input is not validated to QValidator::Acceptable when Return is pressed or interpretText() is called.
@Computer Science Student - Brazil
Web Developer and Researcher
“Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.” - Alan Turing -
@JonB said in How to restrict QSpinBox value to 1 to 100?:
To be correct:
^[1-9][0-9]?$|^100$. Otherwise you'll be matching "numbers in numbers"But for
QAbstractSpinBox::validate()I assume it uses http://doc.qt.io/qt-5/qregularexpressionvalidator.html#details, which states:QRegularExpressionValidator automatically wraps the regular expression in the \A and \z anchors; in other words, it always attempts to do an exact match.
?
Yes, i found the Qt reposity and i noticed
QAbstractSpinBox::validate()returns for defaultQValidator::Acceptablewithout verification.if the input is not validated to QValidator::Acceptable when Return is pressed or interpretText() is called.
@KillerSmath
Not sure your comment is against what I meant?
I was asking @SGaist why it is necessary to put in his^&$in the reg exp given that the docs for http://doc.qt.io/qt-5/qregularexpressionvalidator.html#details (seem to me to) state that it will do full match anyway? UnlessQAbstractSpinBox::validate()does not useQRegularExpressionValidator?
