qchar.3qt

qt-embedded-2.3.8.tar.gz源码

'\" t
.TH QChar 3qt "5 August 2004" "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
QChar \- Light-weight Unicode character
.br
.PP
\fC#include <qstring.h>\fR
.PP
.SS "Public Members"
.in +1c
.ti -1c
.BI "\fBQChar\fR () "
.br
.ti -1c
.BI "\fBQChar\fR ( char c ) "
.br
.ti -1c
.BI "\fBQChar\fR ( uchar c ) "
.br
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.BI "\fBQChar\fR ( uchar " "c" ", uchar r ) "
.br
.ti -1c
.BI "\fBQChar\fR ( const QChar & c ) "
.br
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.BI "\fBQChar\fR ( ushort rc ) "
.br
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.BI "\fBQChar\fR ( short rc ) "
.br
.ti -1c
.BI "\fBQChar\fR ( uint rc ) "
.br
.ti -1c
.BI "\fBQChar\fR ( int rc ) "
.br
.ti -1c
.BI "enum \fBCategory\fR { NoCategory, Mark_NonSpacing, Mark_SpacingCombining, Mark_Enclosing, Number_DecimalDigit, Number_Letter, Number_Other, Separator_Space, Separator_Line, Separator_Paragraph, Other_Control, Other_Format, Other_Surrogate, Other_PrivateUse, Other_NotAssigned, Letter_Uppercase, Letter_Lowercase, Letter_Titlecase, Letter_Modifier, Letter_Other, Punctuation_Connector, Punctuation_Dask, Punctuation_Open, Punctuation_Close, Punctuation_InitialQuote, Punctuation_FinalQuote, Punctuation_Other, Symbol_Math, Symbol_Currency, Symbol_Modifier, Symbol_Other }"
.br
.ti -1c
.BI "enum \fBDirection\fR { DirL, DirR, DirEN, DirES, DirET, DirAN, DirCS, DirB, DirS, DirWS, DirON, DirLRE, DirLRO, DirAL, DirRLE, DirRLO, DirPDF, DirNSM, DirBN }"
.br
.ti -1c
.BI "enum \fBDecomposition\fR { Single, Canonical, Font, NoBreak, Initial, Medial, Final, Isolated, Circle, Super, Sub, Vertical, Wide, Narrow, Small, Square, Compat, Fraction }"
.br
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.BI "enum \fBJoining\fR { OtherJoining, Dual, Right, Center }"
.br
.ti -1c
.BI "int \fBdigitValue\fR () const"
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.BI "QChar \fBlower\fR () const"
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.BI "QChar \fBupper\fR () const"
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.BI "Category \fBcategory\fR () const"
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.ti -1c
.BI "Direction \fBdirection\fR () const"
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.BI "Joining \fBjoining\fR () const"
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.BI "bool \fBmirrored\fR () const"
.br
.ti -1c
.BI "QChar \fBmirroredChar\fR () const"
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.ti -1c
.BI "QString \fBdecomposition\fR () const"
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.ti -1c
.BI "Decomposition \fBdecompositionTag\fR () const"
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.ti -1c
.BI "char \fBlatin1\fR () const"
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.ti -1c
.BI "ushort \fBunicode\fR () const"
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.ti -1c
.BI "operator \fBchar\fR ()const"
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.BI "bool \fBisNull\fR () const"
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.BI "bool \fBisPrint\fR () const"
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.BI "bool \fBisPunct\fR () const"
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.BI "bool \fBisSpace\fR () const"
.br
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.BI "bool \fBisMark\fR () const"
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.BI "bool \fBisLetter\fR () const"
.br
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.BI "bool \fBisNumber\fR () const"
.br
.ti -1c
.BI "bool \fBisLetterOrNumber\fR () const"
.br
.ti -1c
.BI "bool \fBisDigit\fR () const"
.br
.ti -1c
.BI "uchar& \fBcell\fR () "
.br
.ti -1c
.BI "uchar& \fBrow\fR () "
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.BI "uchar \fBcell\fR () const"
.br
.ti -1c
.BI "uchar \fBrow\fR () const"
.br
.in -1c
.SS "Static Public Members"
.in +1c
.ti -1c
.BI "bool \fBnetworkOrdered\fR () "
.br
.in -1c
.SH RELATED FUNCTION DOCUMENTATION
(Note that these are not member functions.)
.in +1c
.ti -1c
.BI "int \fBoperator>=\fR (QChar " "c1" ", QChar " "c2" ")"
.br
.ti -1c
.BI "int \fBoperator>\fR (QChar " "c1" ", QChar " "c2" ")"
.br
.ti -1c
.BI "int \fBoperator==\fR (QChar " "c1" ", QChar " "c2" ")"
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.BI "int \fBoperator<\fR (char " "ch" ", QChar " "c" ")"
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.ti -1c
.BI "int \fBoperator>=\fR (char " "ch" ", QChar " "c" ")"
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.BI "int \fBoperator==\fR (char " "ch" ", QChar " "c" ")"
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.ti -1c
.BI "int \fBoperator!=\fR (QChar " "c" ", char " "ch" ")"
.br
.ti -1c
.BI "int \fBoperator==\fR (QChar " "c" ", char " "ch" ")"
.br
.ti -1c
.BI "int \fBoperator<=\fR (QChar " "c1" ", QChar " "c2" ")"
.br
.ti -1c
.BI "int \fBoperator<=\fR (char " "ch" ", QChar " "c" ")"
.br
.ti -1c
.BI "int \fBoperator>=\fR (QChar " "c" ", char " "ch" ")"
.br
.ti -1c
.BI "int \fBoperator!=\fR (char " "ch" ", QChar " "c" ")"
.br
.ti -1c
.BI "int \fBoperator<=\fR (QChar " "c" ", char " "ch" ")"
.br
.ti -1c
.BI "int \fBoperator>\fR (char " "ch" ", QChar " "c" ")"
.br
.ti -1c
.BI "int \fBoperator<\fR (QChar " "c1" ", QChar " "c2" ")"
.br
.ti -1c
.BI "int \fBoperator<\fR (QChar " "c" ", char " "ch" ")"
.br
.ti -1c
.BI "int \fBoperator>\fR (QChar " "c" ", char " "ch" ")"
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.ti -1c
.BI "int \fBoperator!=\fR (QChar " "c1" ", QChar " "c2" ")"
.br
.in -1c
.SH DESCRIPTION
The QChar class provides a light-weight Unicode character.
.PP
Unicode characters are (so far) 16-bit entities without any markup or structure. This class represents such an entity. It is rather light-weight, so it can be used everywhere. Most compilers treat it approximately like "short int". (In a few years, it may be necessary to make QChar 32-bit, once more than 65536 Unicode code points have been defined and come into use.)
.PP
QChar provides a full complement of testing/classification functions, conversion to and from other formats, from composed to decomposed unicode, and will try to compare and case-convert if you ask it to.
.PP
The classification functions include functions like those in ctype.h, but operating on the full range of unicode characters. They all return TRUE if the character is a certain type of character, and FALSE otherwise.
.PP
These functions are: isNull() (returns TRUE if the character is U+0000), isPrint() (TRUE if the character is any sort of printable character, including whitespace), isPunct() (any sort of punctation), isMark() (Unicode Marks), isLetter (letters), isNumber() (any sort of numeric characters), isLetterOrNumber(), and isDigit() (decimal digits). All of these are wrappers around category(), which returns the unicode-defined category of each character.
.PP
QChar further provides direction(), which indicates the "natural" writing direction of this character, joining(), which indicates how this character joins with its neighbors (needed mostly for Arabic) and finally mirrored(), which indicates whether this character needs to be mirrored when it is printed in its unnatural writing direction.
.PP
Composed Unicode characters (like &aring;) can be converted to decomposed Unicode ("a" followed by "ring above") using decomposition().
.PP
In Unicode, comparison is not necessarily possible, and case conversion is at best very hard. Unicode, covering the "entire" globe, also includes a globe-sized collection of case and sorting problems. Qt tries, but not very hard: operator== and friends will do comparison based purely on the numeric Unicode value (code point) of the characters, and upper() and lower() will do case changes when the character has a well-defined upper/lower-case equivalent. There is no provision for locale-dependent case folding rules or comparison: These functions are meant to be fast, so they can be used unambiguously in data structures.
.PP
The conversion functions include unicode() (to a scalar), latin1() (to scalar, but converts all non-Latin1 characters to 0), row() (gives the Unicode row), cell() (gives the unicode cell), digitValue() (gives the integer value of any of the numerous digit characters), and a host of constructors.