Qt-interest Archive, January 2007
controlling QTextEdit (Qt 4.2.0)
Message 1 in thread
Hi there,
I would like to assess the way QTextEdit accepts user's text input.
Precisely my goal is to make a Hexadecimal editor, that is the user can only
enter the letter 0-9 A-F, 2 chars separated by spaces, and so on...
I have already a way to do that but it is very ugly (by catching the signal
textChanged and correcting the text to verify the hex format). I am
wondering if there is a simpler way using Qt dedicated methods (maybe with
QRegExp???) I am looking over the documentation but so far didn't find what
I want.
Thanks for your help.
Cheers,
Nil
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Message 2 in thread
Take a look at the manual, about "QRegExpValidator".
Regards,
Thomas
nilitonilito nilitonilito schrieb:
> Hi there,
>
> I would like to assess the way QTextEdit accepts user's text input.
> Precisely my goal is to make a Hexadecimal editor, that is the user can
> only enter the letter 0-9 A-F, 2 chars separated by spaces, and so on...
>
> I have already a way to do that but it is very ugly (by catching the
> signal textChanged and correcting the text to verify the hex format). I
> am wondering if there is a simpler way using Qt dedicated methods (maybe
> with QRegExp???) I am looking over the documentation but so far didn't
> find what I want.
>
> Thanks for your help.
>
> Cheers,
> Nil
>
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Message 3 in thread
Hi Thomas,
thanks for your fast answer. I did take a look at QRegExpValidator (although
not completly) but it seems that it is only applyable for QLineEdit not
QTextEdit, I am right?
Nil
>From: Thomas Dähling <t.daehling@xxxxxxxxxxxxxx>
>To: qt-interest@xxxxxxxxxxxxx
>Subject: Re: controlling QTextEdit (Qt 4.2.0)
>Date: Sun, 21 Jan 2007 13:18:44 +0100
>
>Take a look at the manual, about "QRegExpValidator".
>
>Regards,
>Thomas
>
>nilitonilito nilitonilito schrieb:
>>Hi there,
>>
>>I would like to assess the way QTextEdit accepts user's text input.
>>Precisely my goal is to make a Hexadecimal editor, that is the user can
>>only enter the letter 0-9 A-F, 2 chars separated by spaces, and so on...
>>
>>I have already a way to do that but it is very ugly (by catching the
>>signal textChanged and correcting the text to verify the hex format). I am
>>wondering if there is a simpler way using Qt dedicated methods (maybe with
>>QRegExp???) I am looking over the documentation but so far didn't find
>>what I want.
>>
>>Thanks for your help.
>>
>>Cheers,
>>Nil
>>
>>_________________________________________________________________
>>Personnalisez votre Messenger avec Live.com
>>http://www.windowslive.fr/livecom/
>>
>>--
>>To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>>"unsubscribe" in the subject or the body.
>>List archive and information: http://lists.trolltech.com/qt-interest/
>>
>>
>
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Message 4 in thread
Well, there is of course the way to catch the signal TextChanged and undo
the input text that led to an Invalid state from QRegExpValidate, but is
there some more direct way like in QLineEdit?
Nil
>Hi Thomas,
>
>thanks for your fast answer. I did take a look at QRegExpValidator
>(although not completly) but it seems that it is only applyable for
>QLineEdit not QTextEdit, I am right?
>
>Nil
>
>
>>From: Thomas Dähling <t.daehling@xxxxxxxxxxxxxx>
>>To: qt-interest@xxxxxxxxxxxxx
>>Subject: Re: controlling QTextEdit (Qt 4.2.0)
>>Date: Sun, 21 Jan 2007 13:18:44 +0100
>>
>>Take a look at the manual, about "QRegExpValidator".
>>
>>Regards,
>>Thomas
>>
>>nilitonilito nilitonilito schrieb:
>>>Hi there,
>>>
>>>I would like to assess the way QTextEdit accepts user's text input.
>>>Precisely my goal is to make a Hexadecimal editor, that is the user can
>>>only enter the letter 0-9 A-F, 2 chars separated by spaces, and so on...
>>>
>>>I have already a way to do that but it is very ugly (by catching the
>>>signal textChanged and correcting the text to verify the hex format). I
>>>am wondering if there is a simpler way using Qt dedicated methods (maybe
>>>with QRegExp???) I am looking over the documentation but so far didn't
>>>find what I want.
>>>
>>>Thanks for your help.
>>>
>>>Cheers,
>>>Nil
>>>
>>>_________________________________________________________________
>>>Personnalisez votre Messenger avec Live.com
>>>http://www.windowslive.fr/livecom/
>>>
>>>--
>>>To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>>>"unsubscribe" in the subject or the body.
>>>List archive and information: http://lists.trolltech.com/qt-interest/
>>>
>>>
>>
>>--
>>To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>>"unsubscribe" in the subject or the body.
>>List archive and information: http://lists.trolltech.com/qt-interest/
>>
>
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Message 5 in thread
Nil,
My reading of the docs: QRegExpValidator can check any string.
QTextEdit allows you to convert "toPlainText()" which returns a string. As
long as you can arrange to catch your string at the right time I think you've
possibly got what you need.
A
On Sunday 21 January 2007 12:48, nilitonilito nilitonilito wrote:
> >Hi Thomas,
> >
> >thanks for your fast answer. I did take a look at QRegExpValidator
> >(although not completly) but it seems that it is only applyable for
> >QLineEdit not QTextEdit, I am right?
> >
> >Nil
--
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Message 6 in thread
"amit" <pom2@xxxxxxxxxxxxxxxx> wrote in message
news:200701211301.36824.pom2@xxxxxxxxxxxxxxxxxxx
> Nil,
>
> My reading of the docs: QRegExpValidator can check any string.
> QTextEdit allows you to convert "toPlainText()" which returns a string.
As
> long as you can arrange to catch your string at the right time I think
you've
> possibly got what you need.
Well you can use QValidator without attaching it to
a line edit:
QIntValidator doh(this);
QString input("42");
int pos = input.size() - 1; // the last value
if(doh.validate(input,pos) != QValidator::Acceptable) {
input[pos] = ""; // or something
}
But to do this, you would need to check the string using
asPlainText() on each keypress and if it's invalid, strip
the last char and call setPlainText(). Doesn't sound very
efficient. You may be able to do something with QTextCursor though.
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Message 7 in thread
Hi there,
I would like to formulate the following QRegExp :
All hexadecimal number of 2 digits except F7.
I know how to formulate all hexadecimal with 2 digit :
([A-F]|\\d){1,2}
I know how to formulate not F7 :
(?!F7)
but I don't know how to formulate their conjonction?
Thanks for your help
Cheers,
Nil
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Message 8 in thread
Hello Nil,
I am not an expert on regular expressions, so I would suggest this naive one
that I tested with Regex tester part of the examples programs provided with
Qt. It looks like
([A-E]|\\d)([A-F]|\\d)|F([A-F]|[0-6]|[8-9]) (in C++) may work in your case.
It matches (hopefully) all hexadecimal with exactly 2 digits except for F7.
Capture#1 gives the first digit and Capture#2 gives the second digit.
It is now nightime in Europe, and I know that Europeans love this kind of
stuff, so I am sure you'll get perhaps a more "effective" regular expression
tomorrow.
You can also try the Regex tester given with Qt example programs, I am sure
they package it with Qt4.
Christopher
>From: "nilitonilito nilitonilito" <nilitonilito@xxxxxxxxxxx>
>To: qt-interest@xxxxxxxxxxxxx
>Subject: [Qt 4.2.0] QRegExp
>Date: Mon, 22 Jan 2007 20:06:10 +0100
>
>Hi there,
>
>I would like to formulate the following QRegExp :
>
>All hexadecimal number of 2 digits except F7.
>
>I know how to formulate all hexadecimal with 2 digit :
>
>([A-F]|\\d){1,2}
>
>I know how to formulate not F7 :
>
>(?!F7)
>
>but I don't know how to formulate their conjonction?
>
>Thanks for your help
>Cheers,
>Nil
>
>_________________________________________________________________
>Découvrez le Blog heroic Fantaisy d'Eragon!
>http://eragon-heroic-fantasy.spaces.live.com/
>
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>"unsubscribe" in the subject or the body.
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Message 9 in thread
Hi,
nilitonilito nilitonilito wrote:
> All hexadecimal number of 2 digits except F7.
>
> I know how to formulate all hexadecimal with 2 digit :
>
> ([A-F]|\\d){1,2}
Isn't that matching either one or two characters? Maybe ([A-F]|\\d){2,2}
> I know how to formulate not F7 :
>
> (?!F7)
>
> but I don't know how to formulate their conjonction?
Just stick them together:
(?!F7)([A-F]|\\d){2,2}
Tim
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Message 10 in thread
Hi Tim,
The regexp I need is : 1 or 2 hex except f7
(?!F7)([A-F]|\\d){1,2}
is working fine.
Many thanks
Nil
and
>From: Tim Dewhirst <tim@xxxxxxxxxxxxx>
>To: nilitonilito nilitonilito <nilitonilito@xxxxxxxxxxx>
>CC: qt-interest@xxxxxxxxxxxxx
>Subject: Re: [Qt 4.2.0] QRegExp
>Date: Mon, 22 Jan 2007 22:31:04 +0000
>
>Hi,
>
>nilitonilito nilitonilito wrote:
>>All hexadecimal number of 2 digits except F7.
>>
>>I know how to formulate all hexadecimal with 2 digit :
>>
>>([A-F]|\\d){1,2}
>
>Isn't that matching either one or two characters? Maybe ([A-F]|\\d){2,2}
>
>>I know how to formulate not F7 :
>>
>>(?!F7)
>>
>>but I don't know how to formulate their conjonction?
>
>Just stick them together:
>
>(?!F7)([A-F]|\\d){2,2}
>
>Tim
>
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>"unsubscribe" in the subject or the body.
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>
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Message 11 in thread
Well, I've found excatly what I need, it is QValidator, but it seems that it
is for QLineEdit, not for QTextEdit, is there any way to have QValidator on
QTextEdit?
Thanks
Nil
>From: "nilitonilito nilitonilito" <nilitonilito@xxxxxxxxxxx>
>To: qt-interest@xxxxxxxxxxxxx
>Subject: controlling QTextEdit (Qt 4.2.0)
>Date: Sun, 21 Jan 2007 13:02:22 +0100
>
>Hi there,
>
>I would like to assess the way QTextEdit accepts user's text input.
>Precisely my goal is to make a Hexadecimal editor, that is the user can
>only enter the letter 0-9 A-F, 2 chars separated by spaces, and so on...
>
>I have already a way to do that but it is very ugly (by catching the signal
>textChanged and correcting the text to verify the hex format). I am
>wondering if there is a simpler way using Qt dedicated methods (maybe with
>QRegExp???) I am looking over the documentation but so far didn't find what
>I want.
>
>Thanks for your help.
>
>Cheers,
>Nil
>
>_________________________________________________________________
>Personnalisez votre Messenger avec Live.com
>http://www.windowslive.fr/livecom/
>
>--
>To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>"unsubscribe" in the subject or the body.
>List archive and information: http://lists.trolltech.com/qt-interest/
>
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