qintvalidator.3qt

qt专门用于嵌入式的图形开发GUI

'\" t
.TH QIntValidator 3qt "2 September 2005" "Trolltech AS" \" -*- nroff -*-
.\" Copyright 1992-2001 Trolltech AS.  All rights reserved.  See the
.\" license file included in the distribution for a complete license
.\" statement.
.\"
.ad l
.nh
.SH NAME
QIntValidator \- Validator which ensures that a string contains a valid integer within a specified range
.SH SYNOPSIS
\fC#include <qvalidator.h>\fR
.PP
Inherits QValidator.
.PP
.SS "Public Members"
.in +1c
.ti -1c
.BI "\fBQIntValidator\fR ( QObject * parent, const char * name = 0 )"
.br
.ti -1c
.BI "\fBQIntValidator\fR ( int minimum, int maximum, QObject * parent, const char * name = 0 )"
.br
.ti -1c
.BI "\fB~QIntValidator\fR ()"
.br
.ti -1c
.BI "virtual QValidator::State \fBvalidate\fR ( QString & input, int & ) const"
.br
.ti -1c
.BI "void \fBsetBottom\fR ( int )"
.br
.ti -1c
.BI "void \fBsetTop\fR ( int )"
.br
.ti -1c
.BI "virtual void \fBsetRange\fR ( int bottom, int top )"
.br
.ti -1c
.BI "int \fBbottom\fR () const"
.br
.ti -1c
.BI "int \fBtop\fR () const"
.br
.in -1c
.SS "Properties"
.in +1c
.ti -1c
.BI "int \fBbottom\fR - the validator's lowest acceptable value"
.br
.ti -1c
.BI "int \fBtop\fR - the validator's highest acceptable value"
.br
.in -1c
.SH DESCRIPTION
The QIntValidator class provides a validator which ensures that a string contains a valid integer within a specified range.
.PP
Example of use:
.PP
.nf
.br
    QValidator* validator = new QIntValidator( 100, 999, this );
.br
    QLineEdit* edit = new QLineEdit( this );
.br
.br
    // the edit lineedit will only accept integers between 100 and 999
.br
    edit->setValidator( validator );
.br
.fi
.PP
Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.
.PP
.nf
.br
    QString str;
.br
    int pos = 0;
.br
    QIntValidator v( 100, 999, this );
.br
.br
    str = "1";
.br
    v.validate( str, pos );     // returns Intermediate
.br
    str = "12";
.br
    v.validate( str, pos );     // returns Intermediate
.br
.br
    str = "123";
.br
    v.validate( str, pos );     // returns Acceptable
.br
    str = "678";
.br
    v.validate( str, pos );     // returns Acceptable
.br
.br
    str = "1234";
.br
    v.validate( str, pos );     // returns Invalid
.br
    str = "-123";
.br
    v.validate( str, pos );     // returns Invalid
.br
    str = "abc";
.br
    v.validate( str, pos );     // returns Invalid
.br
    str = "12cm";
.br
    v.validate( str, pos );     // returns Invalid
.br
.fi
.PP
The minimum and maximum values are set in one call with setRange() or individually with setBottom() and setTop().
.PP
See also QDoubleValidator, QRegExpValidator, and Miscellaneous Classes.
.SH MEMBER FUNCTION DOCUMENTATION
.SH "QIntValidator::QIntValidator ( QObject * parent, const char * name = 0 )"
Constructs a validator called \fIname\fR with parent \fIparent\fR, that accepts all integers.
.SH "QIntValidator::QIntValidator ( int minimum, int maximum, QObject * parent, const char * name = 0 )"
Constructs a validator called \fIname\fR with parent \fIparent\fR, that accepts integers from \fIminimum\fR to \fImaximum\fR inclusive.
.SH "QIntValidator::~QIntValidator ()"
Destroys the validator, freeing any resources allocated.
.SH "int QIntValidator::bottom () const"
Returns the validator's lowest acceptable value. See the "bottom" property for details.
.SH "void QIntValidator::setBottom ( int )"
Sets the validator's lowest acceptable value. See the "bottom" property for details.
.SH "void QIntValidator::setRange ( int bottom, int top )\fC [virtual]\fR"
Sets the range of the validator to only accept integers between \fIbottom\fR and \fItop\fR inclusive.
.SH "void QIntValidator::setTop ( int )"
Sets the validator's highest acceptable value. See the "top" property for details.
.SH "int QIntValidator::top () const"
Returns the validator's highest acceptable value. See the "top" property for details.
.SH "QValidator::State QIntValidator::validate ( QString & input, int & ) const\fC [virtual]\fR"
Returns Acceptable if the \fIinput\fR is an integer within the valid range, Intermediate if the \fIinput\fR is an integer outside the valid range and Invalid if the \fIinput\fR is not an integer.
.PP
Note: If the valid range consists of just positive integers (e.g. 32 - 100) and \fIinput\fR is a negative integer then Invalid is returned.
.PP
.nf
.br
    int pos = 0;
.br
    s = "abc";
.br
    v.validate( s, pos ); // returns Invalid
.br
.br
    s = "5";
.br
    v.validate( s, pos ); // returns Intermediate
.br
.br
    s = "50";
.br
    v.validate( s, pos ); // returns Valid
.br
.fi
.PP
Reimplemented from QValidator.
.SS "Property Documentation"
.SH "int bottom"
This property holds the validator's lowest acceptable value.
.PP
Set this property's value with setBottom() and get this property's value with bottom().
.PP
See also setRange().
.SH "int top"
This property holds the validator's highest acceptable value.
.PP
Set this property's value with setTop() and get this property's value with top().
.PP
See also setRange().

.SH "SEE ALSO"
.BR http://doc.trolltech.com/qintvalidator.html
.BR http://www.trolltech.com/faq/tech.html
.SH COPYRIGHT
Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the
license file included in the distribution for a complete license
statement.
.SH AUTHOR
Generated automatically from the source code.
.SH BUGS
If you find a bug in Qt, please report it as described in
.BR http://doc.trolltech.com/bughowto.html .
Good bug reports help us to help you. Thank you.
.P
The definitive Qt documentation is provided in HTML format; it is
located at $QTDIR/doc/html and can be read using Qt Assistant or with
a web browser. This man page is provided as a convenience for those
users who prefer man pages, although this format is not officially
supported by Trolltech. 
.P
If you find errors in this manual page, please report them to
.BR [e-mail] .
Please include the name of the manual page (qintvalidator.3qt) and the Qt
version (3.3.5).