QChar 类提供 16 位 Unicode 字符。 更多...
头: | #include <QChar> |
CMake: |
find_package(Qt6 COMPONENTS Core REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Core) |
qmake: | QT += core |
注意: 此类的所有函数 可重入 .
enum | Category { Mark_NonSpacing, Mark_SpacingCombining, Mark_Enclosing, Number_DecimalDigit, Number_Letter, …, Symbol_Other } |
enum | Decomposition { NoDecomposition, Canonical, Circle, Compat, Final, …, Wide } |
enum | Direction { DirAL, DirAN, DirB, DirBN, DirCS, …, DirWS } |
enum | JoiningType { Joining_None, Joining_Causing, Joining_Dual, Joining_Right, Joining_Left, Joining_Transparent } |
enum | Script { Script_Unknown, Script_Inherited, Script_Common, Script_Adlam, Script_Ahom, …, Script_ZanabazarSquare } |
enum | SpecialCharacter { Null, Tabulation, LineFeed, FormFeed, CarriageReturn, …, LastValidCodePoint } |
enum | UnicodeVersion { Unicode_1_1, Unicode_2_0, Unicode_2_1_2, Unicode_3_0, Unicode_3_1, …, Unicode_Unassigned } |
QChar (uchar ch ) | |
QChar (char ch ) | |
QChar (wchar_t ch ) | |
QChar (char16_t ch ) | |
QChar (QLatin1Char ch ) | |
QChar (QChar::SpecialCharacter ch ) | |
QChar (int code ) | |
QChar (uint code ) | |
QChar (short code ) | |
QChar (uchar cell , uchar row ) | |
QChar (ushort code ) | |
QChar () | |
QChar::Category | category () const |
uchar | cell () const |
unsigned char | combiningClass () const |
QString | decomposition () const |
QChar::Decomposition | decompositionTag () const |
int | digitValue () const |
QChar::Direction | direction () const |
bool | hasMirrored () const |
bool | isDigit () const |
bool | isHighSurrogate () const |
bool | isLetter () const |
bool | isLetterOrNumber () const |
bool | isLowSurrogate () const |
bool | isLower () const |
bool | isMark () const |
bool | isNonCharacter () const |
bool | isNull () const |
bool | isNumber () const |
bool | isPrint () const |
bool | isPunct () const |
bool | isSpace () const |
bool | isSurrogate () const |
bool | isSymbol () const |
bool | isTitleCase () const |
bool | isUpper () const |
QChar::JoiningType | joiningType () const |
QChar | mirroredChar () const |
uchar | row () const |
QChar::Script | script () const |
QChar | toCaseFolded () const |
char | toLatin1 () const |
QChar | toLower () const |
QChar | toTitleCase () const |
QChar | toUpper () const |
char16_t | unicode () const |
char16_t & | unicode () |
QChar::UnicodeVersion | unicodeVersion () const |
QChar::Category | category (char32_t ucs4 ) |
unsigned char | combiningClass (char32_t ucs4 ) |
QChar::UnicodeVersion | currentUnicodeVersion () |
QString | decomposition (char32_t ucs4 ) |
QChar::Decomposition | decompositionTag (char32_t ucs4 ) |
int | digitValue (char32_t ucs4 ) |
QChar::Direction | direction (char32_t ucs4 ) |
QChar | fromLatin1 (char c ) |
QChar | fromUcs2 (char16_t c ) |
R | fromUcs4 (char32_t c ) |
bool | hasMirrored (char32_t ucs4 ) |
char16_t | highSurrogate (char32_t ucs4 ) |
bool | isDigit (char32_t ucs4 ) |
bool | isHighSurrogate (char32_t ucs4 ) |
bool | isLetter (char32_t ucs4 ) |
bool | isLetterOrNumber (char32_t ucs4 ) |
bool | isLowSurrogate (char32_t ucs4 ) |
bool | isLower (char32_t ucs4 ) |
bool | isMark (char32_t ucs4 ) |
bool | isNonCharacter (char32_t ucs4 ) |
bool | isNumber (char32_t ucs4 ) |
bool | isPrint (char32_t ucs4 ) |
bool | isPunct (char32_t ucs4 ) |
bool | isSpace (char32_t ucs4 ) |
bool | isSurrogate (char32_t ucs4 ) |
bool | isSymbol (char32_t ucs4 ) |
bool | isTitleCase (char32_t ucs4 ) |
bool | isUpper (char32_t ucs4 ) |
QChar::JoiningType | joiningType (char32_t ucs4 ) |
char16_t | lowSurrogate (char32_t ucs4 ) |
char32_t | mirroredChar (char32_t ucs4 ) |
bool | requiresSurrogates (char32_t ucs4 ) |
QChar::Script | script (char32_t ucs4 ) |
char32_t | surrogateToUcs4 (char16_t high , char16_t low ) |
char32_t | surrogateToUcs4 (QChar high , QChar low ) |
char32_t | toCaseFolded (char32_t ucs4 ) |
char32_t | toLower (char32_t ucs4 ) |
char32_t | toTitleCase (char32_t ucs4 ) |
char32_t | toUpper (char32_t ucs4 ) |
QChar::UnicodeVersion | unicodeVersion (char32_t ucs4 ) |
bool | operator!= (QChar c1 , QChar c2 ) |
bool | operator< (QChar c1 , QChar c2 ) |
QDataStream & | operator<< (QDataStream & out , QChar chr ) |
bool | operator<= (QChar c1 , QChar c2 ) |
bool | operator== (QChar c1 , QChar c2 ) |
bool | operator> (QChar c1 , QChar c2 ) |
bool | operator>= (QChar c1 , QChar c2 ) |
QDataStream & | operator>> (QDataStream & in , QChar & chr ) |
QT_IMPLICIT_QCHAR_CONSTRUCTION |
In Qt, Unicode characters are 16-bit entities without any markup or structure. This class represents such an entity. It is lightweight, so it can be used everywhere. Most compilers treat it like an
unsigned short
.
QChar provides a full complement of testing/classification functions, converting to and from other formats, converting from composed to decomposed Unicode, and trying to compare and case-convert if you ask it to.
The classification functions include functions like those in the standard C++ header <cctype> (formerly <ctype.h>), but operating on the full range of Unicode characters, not just for the ASCII range. They all return true if the character is a certain type of character; otherwise they return false. These classification functions are
isNull
() (returns
true
if the character is '\0'),
isPrint
() (true if the character is any sort of printable character, including whitespace),
isPunct
() (any sort of punctation),
isMark
() (Unicode Mark),
isLetter
() (a letter),
isNumber
() (any sort of numeric character, not just 0-9),
isLetterOrNumber
(),和
isDigit
() (decimal digits). All of these are wrappers around
category
() which return the Unicode-defined category of each character. Some of these also calculate the derived properties (for example
isSpace
() 返回
true
if the character is of category Separator_* or an exceptional code point from
Other_Control
category).
QChar also provides direction (), which indicates the "natural" writing direction of this character. The joiningType () function indicates how the character joins with it's neighbors (needed mostly for Arabic or Syriac) and finally hasMirrored (), which indicates whether the character needs to be mirrored when it is printed in it's "unnatural" writing direction.
Composed Unicode characters (like ring ) can be converted to decomposed Unicode ("a" followed by "ring above") by using decomposition ().
In Unicode, comparison is not necessarily possible and case conversion is very difficult at best. Unicode, covering the "entire" world, also includes most of the world's case and sorting problems. operator==() and friends will do comparison based purely on the numeric Unicode value (code point) of the characters, and toUpper () 和 toLower () will do case changes when the character has a well-defined uppercase/lowercase equivalent. For locale-dependent comparisons, use QString::localeAwareCompare ().
The conversion functions include unicode () (to a scalar), toLatin1 () (to scalar, but converts all non-Latin-1 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.
QChar provides constructors and cast operators that make it easy to convert to and from traditional 8-bit
char
s. If you defined
QT_NO_CAST_FROM_ASCII
and
QT_NO_CAST_TO_ASCII
, as explained in the
QString
documentation, you will need to explicitly call
fromLatin1
(), or use
QLatin1Char
, to construct a QChar from an 8-bit
char
, and you will need to call
toLatin1
() to get the 8-bit value back.
Starting with Qt 6.0, most QChar constructors are
explicit
. This is done to avoid dangerous mistakes when accidentally mixing integral types and strings. You can opt-out (and make these constructors implicit) by defining the macro
QT_IMPLICIT_QCHAR_CONSTRUCTION
.
更多信息见 "About the Unicode Character Database" .
另请参阅 Unicode , QString ,和 QLatin1Char .
This enum maps the Unicode character categories.
The following characters are normative in Unicode:
常量 | 值 | 描述 |
---|---|---|
QChar::Mark_NonSpacing
|
0
|
Unicode class name Mn |
QChar::Mark_SpacingCombining
|
1
|
Unicode class name Mc |
QChar::Mark_Enclosing
|
2
|
Unicode class name Me |
QChar::Number_DecimalDigit
|
3
|
Unicode class name Nd |
QChar::Number_Letter
|
4
|
Unicode class name Nl |
QChar::Number_Other
|
5
|
Unicode class name No |
QChar::Separator_Space
|
6
|
Unicode class name Zs |
QChar::Separator_Line
|
7
|
Unicode class name Zl |
QChar::Separator_Paragraph
|
8
|
Unicode class name Zp |
QChar::Other_Control
|
9
|
Unicode class name Cc |
QChar::Other_Format
|
10
|
Unicode class name Cf |
QChar::Other_Surrogate
|
11
|
Unicode class name Cs |
QChar::Other_PrivateUse
|
12
|
Unicode class name Co |
QChar::Other_NotAssigned
|
13
|
Unicode class name Cn |
The following categories are informative in Unicode:
常量 | 值 | 描述 |
---|---|---|
QChar::Letter_Uppercase
|
14
|
Unicode class name Lu |
QChar::Letter_Lowercase
|
15
|
Unicode class name Ll |
QChar::Letter_Titlecase
|
16
|
Unicode class name Lt |
QChar::Letter_Modifier
|
17
|
Unicode class name Lm |
QChar::Letter_Other
|
18
|
Unicode class name Lo |
QChar::Punctuation_Connector
|
19
|
Unicode class name Pc |
QChar::Punctuation_Dash
|
20
|
Unicode class name Pd |
QChar::Punctuation_Open
|
21
|
Unicode class name Ps |
QChar::Punctuation_Close
|
22
|
Unicode class name Pe |
QChar::Punctuation_InitialQuote
|
23
|
Unicode class name Pi |
QChar::Punctuation_FinalQuote
|
24
|
Unicode class name Pf |
QChar::Punctuation_Other
|
25
|
Unicode class name Po |
QChar::Symbol_Math
|
26
|
Unicode class name Sm |
QChar::Symbol_Currency
|
27
|
Unicode class name Sc |
QChar::Symbol_Modifier
|
28
|
Unicode class name Sk |
QChar::Symbol_Other
|
29
|
Unicode class name So |
另请参阅 category ().
This enum type defines the Unicode decomposition attributes. See the Unicode standard for a description of the values.
常量 | 值 |
---|---|
QChar::NoDecomposition
|
0
|
QChar::Canonical
|
1
|
QChar::Circle
|
8
|
QChar::Compat
|
16
|
QChar::Final
|
6
|
QChar::Font
|
2
|
QChar::Fraction
|
17
|
QChar::Initial
|
4
|
QChar::Isolated
|
7
|
QChar::Medial
|
5
|
QChar::Narrow
|
13
|
QChar::NoBreak
|
3
|
QChar::Small
|
14
|
QChar::Square
|
15
|
QChar::Sub
|
10
|
QChar::Super
|
9
|
QChar::Vertical
|
11
|
QChar::Wide
|
12
|
另请参阅 decomposition ().
This enum type defines the Unicode direction attributes. See the Unicode Standard for a description of the values.
In order to conform to C/C++ naming conventions "Dir" is prepended to the codes used in the Unicode Standard.
常量 | 值 | 描述 |
---|---|---|
QChar::DirAL
|
13
|
|
QChar::DirAN
|
5
|
|
QChar::DirB
|
7
|
|
QChar::DirBN
|
18
|
|
QChar::DirCS
|
6
|
|
QChar::DirEN
|
2
|
|
QChar::DirES
|
3
|
|
QChar::DirET
|
4
|
|
QChar::DirFSI
|
21
|
Since Qt 5.3 |
QChar::DirL
|
0
|
|
QChar::DirLRE
|
11
|
|
QChar::DirLRI
|
19
|
Since Qt 5.3 |
QChar::DirLRO
|
12
|
|
QChar::DirNSM
|
17
|
|
QChar::DirON
|
10
|
|
QChar::DirPDF
|
16
|
|
QChar::DirPDI
|
22
|
Since Qt 5.3 |
QChar::DirR
|
1
|
|
QChar::DirRLE
|
14
|
|
QChar::DirRLI
|
20
|
Since Qt 5.3 |
QChar::DirRLO
|
15
|
|
QChar::DirS
|
8
|
|
QChar::DirWS
|
9
|
另请参阅 direction ().
since 5.3
This enum type defines the Unicode joining type attributes. See the Unicode standard for a description of the values.
In order to conform to C/C++ naming conventions "Joining_" is prepended to the codes used in the Unicode Standard.
常量 | 值 |
---|---|
QChar::Joining_None
|
0
|
QChar::Joining_Causing
|
1
|
QChar::Joining_Dual
|
2
|
QChar::Joining_Right
|
3
|
QChar::Joining_Left
|
4
|
QChar::Joining_Transparent
|
5
|
另请参阅 joiningType ().
[since 5.1]
enum QChar::
Script
This enum type defines the Unicode script property values.
For details about the Unicode script property values see Unicode Standard Annex #24 .
In order to conform to C/C++ naming conventions "Script_" is prepended to the codes used in the Unicode Standard.
常量 | 值 | 描述 |
---|---|---|
QChar::Script_Unknown
|
0
|
For unassigned, private-use, noncharacter, and surrogate code points. |
QChar::Script_Inherited
|
1
|
For characters that may be used with multiple scripts and that inherit their script from the preceding characters. These include nonspacing marks, enclosing marks, and zero width joiner/non-joiner characters. |
QChar::Script_Common
|
2
|
For characters that may be used with multiple scripts and that do not inherit their script from the preceding characters. |
QChar::Script_Adlam
|
132
|
Since Qt 5.11 |
QChar::Script_Ahom
|
126
|
Since Qt 5.6 |
QChar::Script_AnatolianHieroglyphs
|
127
|
Since Qt 5.6 |
QChar::Script_Arabic
|
8
|
|
QChar::Script_Armenian
|
6
|
|
QChar::Script_Avestan
|
80
|
|
QChar::Script_Balinese
|
62
|
|
QChar::Script_Bamum
|
84
|
|
QChar::Script_BassaVah
|
104
|
Since Qt 5.5 |
QChar::Script_Batak
|
93
|
|
QChar::Script_Bengali
|
12
|
|
QChar::Script_Bhaiksuki
|
133
|
Since Qt 5.11 |
QChar::Script_Bopomofo
|
36
|
|
QChar::Script_Brahmi
|
94
|
|
QChar::Script_Braille
|
54
|
|
QChar::Script_Buginese
|
55
|
|
QChar::Script_Buhid
|
44
|
|
QChar::Script_CanadianAboriginal
|
29
|
|
QChar::Script_Carian
|
75
|
|
QChar::Script_CaucasianAlbanian
|
103
|
Since Qt 5.5 |
QChar::Script_Chakma
|
96
|
|
QChar::Script_Cham
|
77
|
|
QChar::Script_Cherokee
|
28
|
|
QChar::Script_Chorasmian
|
153
|
Since Qt 5.15 |
QChar::Script_Coptic
|
46
|
|
QChar::Script_Cuneiform
|
63
|
|
QChar::Script_Cypriot
|
53
|
|
QChar::Script_Cyrillic
|
5
|
|
QChar::Script_Deseret
|
41
|
|
QChar::Script_Devanagari
|
11
|
|
QChar::Script_DivesAkuru
|
154
|
Since Qt 5.15 |
QChar::Script_Dogra
|
142
|
Since Qt 5.15 |
QChar::Script_Duployan
|
105
|
Since Qt 5.5 |
QChar::Script_EgyptianHieroglyphs
|
81
|
|
QChar::Script_Elbasan
|
106
|
Since Qt 5.5 |
QChar::Script_Elymaic
|
149
|
Since Qt 5.15 |
QChar::Script_Ethiopic
|
27
|
|
QChar::Script_Georgian
|
25
|
|
QChar::Script_Glagolitic
|
57
|
|
QChar::Script_Gothic
|
40
|
|
QChar::Script_Grantha
|
107
|
Since Qt 5.5 |
QChar::Script_Greek
|
4
|
|
QChar::Script_Gujarati
|
14
|
|
QChar::Script_GunjalaGondi
|
143
|
Since Qt 5.15 |
QChar::Script_Gurmukhi
|
13
|
|
QChar::Script_Han
|
37
|
|
QChar::Script_Hangul
|
26
|
|
QChar::Script_HanifiRohingya
|
144
|
Since Qt 5.15 |
QChar::Script_Hanunoo
|
43
|
|
QChar::Script_Hatran
|
128
|
Since Qt 5.6 |
QChar::Script_Hebrew
|
7
|
|
QChar::Script_Hiragana
|
34
|
|
QChar::Script_ImperialAramaic
|
87
|
|
QChar::Script_InscriptionalPahlavi
|
90
|
|
QChar::Script_InscriptionalParthian
|
89
|
|
QChar::Script_Javanese
|
85
|
|
QChar::Script_Kaithi
|
92
|
|
QChar::Script_Kannada
|
18
|
|
QChar::Script_Katakana
|
35
|
|
QChar::Script_KayahLi
|
72
|
|
QChar::Script_Kharoshthi
|
61
|
|
QChar::Script_KhitanSmallScript
|
155
|
Since Qt 5.15 |
QChar::Script_Khmer
|
32
|
|
QChar::Script_Khojki
|
109
|
Since Qt 5.5 |
QChar::Script_Khudawadi
|
123
|
Since Qt 5.5 |
QChar::Script_Lao
|
22
|
|
QChar::Script_Latin
|
3
|
|
QChar::Script_Lepcha
|
68
|
|
QChar::Script_Limbu
|
47
|
|
QChar::Script_LinearA
|
110
|
Since Qt 5.5 |
QChar::Script_LinearB
|
49
|
|
QChar::Script_Lisu
|
83
|
|
QChar::Script_Lycian
|
74
|
|
QChar::Script_Lydian
|
76
|
|
QChar::Script_Mahajani
|
111
|
Since Qt 5.5 |
QChar::Script_Makasar
|
145
|
Since Qt 5.15 |
QChar::Script_Malayalam
|
19
|
|
QChar::Script_Mandaic
|
95
|
|
QChar::Script_Manichaean
|
112
|
Since Qt 5.5 |
QChar::Script_Marchen
|
134
|
Since Qt 5.11 |
QChar::Script_MasaramGondi
|
138
|
Since Qt 5.11 |
QChar::Script_Medefaidrin
|
146
|
Since Qt 5.15 |
QChar::Script_MeeteiMayek
|
86
|
|
QChar::Script_MendeKikakui
|
113
|
Since Qt 5.5 |
QChar::Script_MeroiticCursive
|
97
|
|
QChar::Script_MeroiticHieroglyphs
|
98
|
|
QChar::Script_Miao
|
99
|
|
QChar::Script_Modi
|
114
|
Since Qt 5.5 |
QChar::Script_Mongolian
|
33
|
|
QChar::Script_Mro
|
115
|
Since Qt 5.5 |
QChar::Script_Multani
|
129
|
Since Qt 5.6 |
QChar::Script_Myanmar
|
24
|
|
QChar::Script_Nabataean
|
117
|
Since Qt 5.5 |
QChar::Script_Nandinagari
|
150
|
Since Qt 5.15 |
QChar::Script_Newa
|
135
|
Since Qt 5.11 |
QChar::Script_NewTaiLue
|
56
|
|
QChar::Script_Nko
|
66
|
|
QChar::Script_Nushu
|
139
|
Since Qt 5.11 |
QChar::Script_NyiakengPuachueHmong
|
151
|
Since Qt 5.15 |
QChar::Script_Ogham
|
30
|
|
QChar::Script_OlChiki
|
69
|
|
QChar::Script_OldHungarian
|
130
|
Since Qt 5.6 |
QChar::Script_OldItalic
|
39
|
|
QChar::Script_OldNorthArabian
|
116
|
Since Qt 5.5 |
QChar::Script_OldPermic
|
120
|
Since Qt 5.5 |
QChar::Script_OldPersian
|
60
|
|
QChar::Script_OldSogdian
|
147
|
Since Qt 5.15 |
QChar::Script_OldSouthArabian
|
88
|
|
QChar::Script_OldTurkic
|
91
|
|
QChar::Script_Oriya
|
15
|
|
QChar::Script_Osage
|
136
|
Since Qt 5.11 |
QChar::Script_Osmanya
|
52
|
|
QChar::Script_PahawhHmong
|
108
|
Since Qt 5.5 |
QChar::Script_Palmyrene
|
118
|
Since Qt 5.5 |
QChar::Script_PauCinHau
|
119
|
Since Qt 5.5 |
QChar::Script_PhagsPa
|
65
|
|
QChar::Script_Phoenician
|
64
|
|
QChar::Script_PsalterPahlavi
|
121
|
Since Qt 5.5 |
QChar::Script_Rejang
|
73
|
|
QChar::Script_Runic
|
31
|
|
QChar::Script_Samaritan
|
82
|
|
QChar::Script_Saurashtra
|
71
|
|
QChar::Script_Sharada
|
100
|
|
QChar::Script_Shavian
|
51
|
|
QChar::Script_Siddham
|
122
|
Since Qt 5.5 |
QChar::Script_SignWriting
|
131
|
Since Qt 5.6 |
QChar::Script_Sinhala
|
20
|
|
QChar::Script_Sogdian
|
148
|
Since Qt 5.15 |
QChar::Script_SoraSompeng
|
101
|
|
QChar::Script_Soyombo
|
140
|
Since Qt 5.11 |
QChar::Script_Sundanese
|
67
|
|
QChar::Script_SylotiNagri
|
59
|
|
QChar::Script_Syriac
|
9
|
|
QChar::Script_Tagalog
|
42
|
|
QChar::Script_Tagbanwa
|
45
|
|
QChar::Script_TaiLe
|
48
|
|
QChar::Script_TaiTham
|
78
|
|
QChar::Script_TaiViet
|
79
|
|
QChar::Script_Takri
|
102
|
|
QChar::Script_Tamil
|
16
|
|
QChar::Script_Tangut
|
137
|
Since Qt 5.11 |
QChar::Script_Telugu
|
17
|
|
QChar::Script_Thaana
|
10
|
|
QChar::Script_Thai
|
21
|
|
QChar::Script_Tibetan
|
23
|
|
QChar::Script_Tifinagh
|
58
|
|
QChar::Script_Tirhuta
|
124
|
Since Qt 5.5 |
QChar::Script_Ugaritic
|
50
|
|
QChar::Script_Vai
|
70
|
|
QChar::Script_Wancho
|
152
|
Since Qt 5.15 |
QChar::Script_WarangCiti
|
125
|
Since Qt 5.5 |
QChar::Script_Yezidi
|
156
|
Since Qt 5.15 |
QChar::Script_Yi
|
38
|
|
QChar::Script_ZanabazarSquare
|
141
|
Since Qt 5.11 |
该枚举在 Qt 5.1 引入或被修改。
另请参阅 script ().
常量 | 值 | 描述 |
---|---|---|
QChar::Null
|
0x0000
|
A QChar with this value isNull (). |
QChar::Tabulation
|
0x0009
|
Character tabulation. |
QChar::LineFeed
|
0x000a
|
|
QChar::FormFeed
|
0x000c
|
|
QChar::CarriageReturn
|
0x000d
|
|
QChar::Space
|
0x0020
|
|
QChar::Nbsp
|
0x00a0
|
Non-breaking space. |
QChar::SoftHyphen
|
0x00ad
|
|
QChar::ReplacementCharacter
|
0xfffd
|
The character shown when a font has no glyph for a certain codepoint. A special question mark character is often used. Codecs use this codepoint when input data cannot be represented in Unicode. |
QChar::ObjectReplacementCharacter
|
0xfffc
|
Used to represent an object such as an image when such objects cannot be presented. |
QChar::ByteOrderMark
|
0xfeff
|
|
QChar::ByteOrderSwapped
|
0xfffe
|
|
QChar::ParagraphSeparator
|
0x2029
|
|
QChar::LineSeparator
|
0x2028
|
|
QChar::VisualTabCharacter
|
0x2192
|
Used to represent a tabulation as a horizontal arrow. Since 6.2. |
QChar::LastValidCodePoint
|
0x10ffff
|
Specifies which version of the Unicode standard introduced a certain character.
常量 | 值 | 描述 |
---|---|---|
QChar::Unicode_1_1
|
1
|
版本 1.1 |
QChar::Unicode_2_0
|
2
|
Version 2.0 |
QChar::Unicode_2_1_2
|
3
|
Version 2.1.2 |
QChar::Unicode_3_0
|
4
|
版本 3.0 |
QChar::Unicode_3_1
|
5
|
版本 3.1 |
QChar::Unicode_3_2
|
6
|
Version 3.2 |
QChar::Unicode_4_0
|
7
|
Version 4.0 |
QChar::Unicode_4_1
|
8
|
Version 4.1 |
QChar::Unicode_5_0
|
9
|
Version 5.0 |
QChar::Unicode_5_1
|
10
|
Version 5.1 |
QChar::Unicode_5_2
|
11
|
Version 5.2 |
QChar::Unicode_6_0
|
12
|
Version 6.0 |
QChar::Unicode_6_1
|
13
|
Version 6.1 |
QChar::Unicode_6_2
|
14
|
Version 6.2 |
QChar::Unicode_6_3
|
15
|
Version 6.3 Since Qt 5.3 |
QChar::Unicode_7_0
|
16
|
Version 7.0 Since Qt 5.5 |
QChar::Unicode_8_0
|
17
|
Version 8.0 Since Qt 5.6 |
QChar::Unicode_9_0
|
18
|
Version 9.0 Since Qt 5.11 |
QChar::Unicode_10_0
|
19
|
Version 10.0 Since Qt 5.11 |
QChar::Unicode_11_0
|
20
|
Version 11.0 Since Qt 5.15 |
QChar::Unicode_12_0
|
21
|
Version 12.0 Since Qt 5.15 |
QChar::Unicode_12_1
|
22
|
Version 12.1 Since Qt 5.15 |
QChar::Unicode_13_0
|
23
|
Version 13.0 Since Qt 5.15 |
QChar::Unicode_Unassigned
|
0
|
The value is not assigned to any character in version 8.0 of Unicode. |
另请参阅 unicodeVersion () 和 currentUnicodeVersion ().
Constructs a QChar corresponding to ASCII/Latin-1 character ch .
注意:
This constructor is not available when
QT_NO_CAST_FROM_ASCII
or
QT_RESTRICTED_CAST_FROM_ASCII
is defined.
另请参阅 QT_NO_CAST_FROM_ASCII and QT_RESTRICTED_CAST_FROM_ASCII .
Constructs a QChar corresponding to ASCII/Latin-1 character ch .
注意:
This constructor is not available when
QT_NO_CAST_FROM_ASCII
is defined.
另请参阅 QT_NO_CAST_FROM_ASCII .
[since 5.10]
QChar::
QChar
(
wchar_t
ch
)
Constructs a QChar corresponding to the wide character ch .
注意: This constructor is only available on Windows.
该函数在 Qt 5.10 引入。
[since 5.10]
QChar::
QChar
(
char16_t
ch
)
Constructs a QChar corresponding to the UTF-16 character ch .
该函数在 Qt 5.10 引入。
Constructs a QChar corresponding to ASCII/Latin-1 character ch .
Constructs a QChar for the predefined character value ch .
Constructs a QChar for the character with Unicode code point code .
Constructs a QChar for the character with Unicode code point code .
Constructs a QChar for the character with Unicode code point code .
Constructs a QChar for Unicode cell cell in row row .
Constructs a QChar for the character with Unicode code point code .
Constructs a null QChar ('\0').
另请参阅 isNull ().
Returns the character's category.
[static]
QChar::Category
QChar::
category
(
char32_t
ucs4
)
这是重载函数。
Returns the category of the UCS-4-encoded character specified by ucs4 .
注意:
Before Qt 6, this function took a
uint
自变量。
Returns the cell (least significant byte) of the Unicode character.
另请参阅 row ().
Returns the combining class for the character as defined in the Unicode standard. This is mainly useful as a positioning hint for marks attached to a base character.
The Qt text rendering engine uses this information to correctly position non-spacing marks around a base character.
[static]
unsigned
char
QChar::
combiningClass
(
char32_t
ucs4
)
这是重载函数。
Returns the combining class for the UCS-4-encoded character specified by ucs4 , as defined in the Unicode standard.
注意:
Before Qt 6, this function took a
uint
自变量。
[static]
QChar::UnicodeVersion
QChar::
currentUnicodeVersion
()
Returns the most recent supported Unicode version.
Decomposes a character into it's constituent parts. Returns an empty string if no decomposition exists.
[static]
QString
QChar::
decomposition
(
char32_t
ucs4
)
这是重载函数。
Decomposes the UCS-4-encoded character specified by ucs4 into it's constituent parts. Returns an empty string if no decomposition exists.
注意:
Before Qt 6, this function took a
uint
自变量。
Returns the tag defining the composition of the character. Returns QChar::NoDecomposition if no decomposition exists.
[static]
QChar::Decomposition
QChar::
decompositionTag
(
char32_t
ucs4
)
这是重载函数。
Returns the tag defining the composition of the UCS-4-encoded character specified by ucs4 。返回 QChar::NoDecomposition if no decomposition exists.
注意:
Before Qt 6, this function took a
uint
自变量。
Returns the numeric value of the digit, or -1 if the character is not a digit.
[static]
int
QChar::
digitValue
(
char32_t
ucs4
)
这是重载函数。
Returns the numeric value of the digit specified by the UCS-4-encoded character, ucs4 , or -1 if the character is not a digit.
注意:
Before Qt 6, this function took a
uint
自变量。
Returns the character's direction.
[static]
QChar::Direction
QChar::
direction
(
char32_t
ucs4
)
这是重载函数。
Returns the direction of the UCS-4-encoded character specified by ucs4 .
注意:
Before Qt 6, this function took a
uint
自变量。
[static]
QChar
QChar::
fromLatin1
(
char
c
)
Converts the Latin-1 character c to its equivalent QChar . This is mainly useful for non-internationalized software.
An alternative is to use QLatin1Char .
另请参阅 toLatin1 () 和 unicode ().
[static, since 6.0]
QChar
QChar::
fromUcs2
(
char16_t
c
)
构造 QChar from UTF-16 character c .
该函数在 Qt 6.0 引入。
另请参阅 fromUcs4 ().
[static, since 6.0]
R
QChar::
fromUcs4
(
char32_t
c
)
Returns an anonymous struct that
char16_t chars[2]
array,
若
c
requires surrogates,
chars[0]
contains the high surrogate and
chars[1]
the low surrogate, and the
QStringView
has size 2. Otherwise,
chars[0]
包含
c
and
chars[1]
is
null
,和
QStringView
has size 1.
This allows easy use of the result:
QString s; s += QChar::fromUcs4(ch);
for (char16_t c16 : QChar::fromUcs4(ch)) use(c16);
该函数在 Qt 6.0 引入。
另请参阅 fromUcs2 () 和 requiresSurrogates ().
返回
true
if the character should be reversed if the text direction is reversed; otherwise returns
false
.
A bit faster equivalent of (ch. mirroredChar () != ch).
另请参阅 mirroredChar ().
[static, since 5.0]
bool
QChar::
hasMirrored
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
should be reversed if the text direction is reversed; otherwise returns
false
.
A bit faster equivalent of ( QChar::mirroredChar (ucs4) != ucs4).
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
另请参阅 mirroredChar ().
[static]
char16_t
QChar::
highSurrogate
(
char32_t
ucs4
)
Returns the high surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.
注意:
Before Qt 6, this function took a
uint
argument and returned
ushort
.
返回
true
if the character is a decimal digit (
Number_DecimalDigit
);否则返回
false
.
另请参阅 isNumber ().
[static, since 5.0]
bool
QChar::
isDigit
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a decimal digit (
Number_DecimalDigit
);否则返回
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
另请参阅 isNumber ().
返回
true
若
QChar
is the high part of a UTF16 surrogate (for example if its code point is in range [0xd800..0xdbff]); false otherwise.
[static]
bool
QChar::
isHighSurrogate
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is the high part of a UTF16 surrogate (for example if its code point is in range [0xd800..0xdbff]); false otherwise.
注意:
Before Qt 6, this function took a
uint
自变量。
返回
true
if the character is a letter (Letter_* categories); otherwise returns
false
.
[static, since 5.0]
bool
QChar::
isLetter
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a letter (Letter_* categories); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
if the character is a letter or number (Letter_* or Number_* categories); otherwise returns
false
.
[static, since 5.0]
bool
QChar::
isLetterOrNumber
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a letter or number (Letter_* or Number_* categories); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
若
QChar
is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.
[static]
bool
QChar::
isLowSurrogate
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.
注意:
Before Qt 6, this function took a
uint
自变量。
返回
true
if the character is a lowercase letter, for example
category
() 是
Letter_Lowercase
.
另请参阅 isUpper (), toLower (),和 toUpper ().
[static, since 5.0]
bool
QChar::
isLower
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a lowercase letter, for example
category
() 是
Letter_Lowercase
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
另请参阅 isUpper (), toLower (),和 toUpper ().
返回
true
if the character is a mark (Mark_* categories); otherwise returns
false
.
见 QChar::Category for more information regarding marks.
[static, since 5.0]
bool
QChar::
isMark
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a mark (Mark_* categories); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
[since 5.0]
bool
QChar::
isNonCharacter
() const
返回
true
若
QChar
is a non-character; false otherwise.
Unicode has a certain number of code points that are classified as "non-characters:" that is, they can be used for internal purposes in applications but cannot be used for text interchange. Those are the last two entries each Unicode Plane ([0xfffe..0xffff], [0x1fffe..0x1ffff], etc.) as well as the entries in range [0xfdd0..0xfdef].
该函数在 Qt 5.0 引入。
[static, since 5.0]
bool
QChar::
isNonCharacter
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a non-character; false otherwise.
Unicode has a certain number of code points that are classified as "non-characters:" that is, they can be used for internal purposes in applications but cannot be used for text interchange. Those are the last two entries each Unicode Plane ([0xfffe..0xffff], [0x1fffe..0x1ffff], etc.) as well as the entries in range [0xfdd0..0xfdef].
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
if the character is the Unicode character 0x0000 ('\0'); otherwise returns
false
.
返回
true
if the character is a number (Number_* categories, not just 0-9); otherwise returns
false
.
另请参阅 isDigit ().
[static, since 5.0]
bool
QChar::
isNumber
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a number (Number_* categories, not just 0-9); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
另请参阅 isDigit ().
返回
true
if the character is a printable character; otherwise returns
false
. This is any character not of category
Other_
*.
Note that this gives no indication of whether the character is available in a particular font.
[static, since 5.0]
bool
QChar::
isPrint
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a printable character; otherwise returns
false
. This is any character not of category
Other_
*.
Note that this gives no indication of whether the character is available in a particular font.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
if the character is a punctuation mark (Punctuation_* categories); otherwise returns
false
.
[static, since 5.0]
bool
QChar::
isPunct
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a punctuation mark (Punctuation_* categories); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
if the character is a separator character (Separator_* categories or certain code points from
Other_Control
category); otherwise returns
false
.
[static, since 5.0]
bool
QChar::
isSpace
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a separator character (Separator_* categories or certain code points from
Other_Control
category); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
[since 5.0]
bool
QChar::
isSurrogate
() const
返回
true
若
QChar
contains a code point that is in either the high or the low part of the UTF-16 surrogate range (for example if its code point is in range [0xd800..0xdfff]); false otherwise.
该函数在 Qt 5.0 引入。
[static, since 5.0]
bool
QChar::
isSurrogate
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
contains a code point that is in either the high or the low part of the UTF-16 surrogate range (for example if its code point is in range [0xd800..0xdfff]); false otherwise.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
if the character is a symbol (Symbol_* categories); otherwise returns
false
.
[static, since 5.0]
bool
QChar::
isSymbol
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a symbol (Symbol_* categories); otherwise returns
false
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
返回
true
if the character is a titlecase letter, for example
category
() 是
Letter_Titlecase
.
另请参阅 isLower (), toUpper (), toLower (),和 toTitleCase ().
[static, since 5.0]
bool
QChar::
isTitleCase
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is a titlecase letter, for example
category
() 是
Letter_Titlecase
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
另请参阅 isLower (), toUpper (), toLower (),和 toTitleCase ().
返回
true
if the character is an uppercase letter, for example
category
() 是
Letter_Uppercase
.
另请参阅 isLower (), toUpper (),和 toLower ().
[static, since 5.0]
bool
QChar::
isUpper
(
char32_t
ucs4
)
这是重载函数。
返回
true
if the UCS-4-encoded character specified by
ucs4
is an uppercase letter, for example
category
() 是
Letter_Uppercase
.
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.0 引入。
另请参阅 isLower (), toUpper (),和 toLower ().
[since 5.3]
QChar::JoiningType
QChar::
joiningType
() const
Returns information about the joining type attributes of the character (needed for certain languages such as Arabic or Syriac).
该函数在 Qt 5.3 引入。
[static, since 5.3]
QChar::JoiningType
QChar::
joiningType
(
char32_t
ucs4
)
这是重载函数。
Returns information about the joining type attributes of the UCS-4-encoded character specified by ucs4 (needed for certain languages such as Arabic or Syriac).
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.3 引入。
[static]
char16_t
QChar::
lowSurrogate
(
char32_t
ucs4
)
Returns the low surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.
注意:
Before Qt 6, this function took a
uint
argument and returned
ushort
.
Returns the mirrored character if this character is a mirrored character; otherwise returns the character itself.
另请参阅 hasMirrored ().
[static]
char32_t
QChar::
mirroredChar
(
char32_t
ucs4
)
这是重载函数。
Returns the mirrored character if the UCS-4-encoded character specified by ucs4 is a mirrored character; otherwise returns the character itself.
注意:
Before Qt 6, this function took a
uint
argument and returned
uint
.
另请参阅 hasMirrored ().
[static]
bool
QChar::
requiresSurrogates
(
char32_t
ucs4
)
返回
true
if the UCS-4-encoded character specified by
ucs4
can be split into the high and low parts of a UTF16 surrogate (for example if its code point is greater than or equals to 0x10000); false otherwise.
注意:
Before Qt 6, this function took a
uint
自变量。
Returns the row (most significant byte) of the Unicode character.
另请参阅 cell ().
[since 5.1]
QChar::Script
QChar::
script
() const
Returns the Unicode script property value for this character.
该函数在 Qt 5.1 引入。
[static, since 5.1]
QChar::Script
QChar::
script
(
char32_t
ucs4
)
这是重载函数。
Returns the Unicode script property value for the character specified in its UCS-4-encoded form as ucs4 .
注意:
Before Qt 6, this function took a
uint
自变量。
该函数在 Qt 5.1 引入。
[static]
char32_t
QChar::
surrogateToUcs4
(
char16_t
high
,
char16_t
low
)
Converts a UTF16 surrogate pair with the given high and low values to it's UCS-4-encoded code point.
注意:
Before Qt 6, this function took
ushort
arguments and returned
uint
.
[static]
char32_t
QChar::
surrogateToUcs4
(
QChar
high
,
QChar
low
)
这是重载函数。
Converts a UTF16 surrogate pair ( high , low ) to it's UCS-4-encoded code point.
注意:
Before Qt 6, this function returned
uint
.
Returns the case folded equivalent of the character. For most Unicode characters this is the same as toLower ().
[static]
char32_t
QChar::
toCaseFolded
(
char32_t
ucs4
)
这是重载函数。
Returns the case folded equivalent of the UCS-4-encoded character specified by ucs4 . For most Unicode characters this is the same as toLower ().
注意:
Before Qt 6, this function took a
uint
argument and returned
uint
.
Returns the Latin-1 character equivalent to the QChar , or 0. This is mainly useful for non-internationalized software.
注意: It is not possible to distinguish a non-Latin-1 character from a Latin-1 0 (NUL) character. Prefer to use unicode (), which does not have this ambiguity.
另请参阅 unicode ().
Returns the lowercase equivalent if the character is uppercase or titlecase; otherwise returns the character itself.
[static]
char32_t
QChar::
toLower
(
char32_t
ucs4
)
这是重载函数。
Returns the lowercase equivalent of the UCS-4-encoded character specified by ucs4 if the character is uppercase or titlecase; otherwise returns the character itself.
注意:
Before Qt 6, this function took a
uint
argument and returned
uint
.
Returns the title case equivalent if the character is lowercase or uppercase; otherwise returns the character itself.
[static]
char32_t
QChar::
toTitleCase
(
char32_t
ucs4
)
这是重载函数。
Returns the title case equivalent of the UCS-4-encoded character specified by ucs4 if the character is lowercase or uppercase; otherwise returns the character itself.
注意:
Before Qt 6, this function took a
uint
argument and returned
uint
.
Returns the uppercase equivalent if the character is lowercase or titlecase; otherwise returns the character itself.
[static]
char32_t
QChar::
toUpper
(
char32_t
ucs4
)
这是重载函数。
Returns the uppercase equivalent of the UCS-4-encoded character specified by ucs4 if the character is lowercase or titlecase; otherwise returns the character itself.
注意:
Before Qt 6, this function took a
uint
argument and returned
uint
.
Returns the numeric Unicode value of the QChar .
Returns a reference to the numeric Unicode value of the QChar .
Returns the Unicode version that introduced this character.
[static]
QChar::UnicodeVersion
QChar::
unicodeVersion
(
char32_t
ucs4
)
这是重载函数。
Returns the Unicode version that introduced the character specified in its UCS-4-encoded form as ucs4 .
注意:
Before Qt 6, this function took a
uint
自变量。
返回
true
if
c1
and
c2
are not the same Unicode character; otherwise returns
false
.
返回
true
if the numeric Unicode value of
c1
is less than that of
c2
;否则返回
false
.
Writes the char chr 到流 out .
另请参阅 序列化 Qt 数据类型 .
返回
true
if the numeric Unicode value of
c1
is less than or equal to that of
c2
;否则返回
false
.
返回
true
if
c1
and
c2
are the same Unicode character; otherwise returns
false
.
返回
true
if the numeric Unicode value of
c1
is greater than that of
c2
;否则返回
false
.
返回
true
if the numeric Unicode value of
c1
is greater than or equal to that of
c2
;否则返回
false
.
Reads a char from the stream in into char chr .
另请参阅 序列化 Qt 数据类型 .
[since 6.0]
QT_IMPLICIT_QCHAR_CONSTRUCTION
Defining this macro makes certain QChar constructors implicit rather than explicit. This is done to enforce safe conversions:
QString str = getString(); if (str == 123) { // Oops, meant str == "123". By default does not compile, // *unless* this macro is defined, in which case, it's interpreted // as `if (str == QChar(123))`, that is, `if (str == '{')`. // Likely, not what we meant. }
This macro is provided to keep existing code working; it is recommended to instead use explicit conversions and/or QLatin1Char . For instance:
QChar c1 = 'x'; // OK, unless QT_NO_CAST_FROM_ASCII is defined QChar c2 = u'x'; // always OK, recommended QChar c3 = QLatin1Char('x'); // always OK, recommended // from int to 1 UTF-16 code unit: must guarantee that the input is <= 0xFFFF QChar c4 = 120; // compile error, unless QT_IMPLICIT_QCHAR_CONSTRUCTION is defined QChar c5(120); // OK (direct initialization) auto c6 = QChar(120); // ditto // from int/char32_t to 1/2 UTF-16 code units: // 𝄞 'MUSICAL SYMBOL G CLEF' (U+1D11E) auto c7 = QChar(0x1D11E); // compiles, but undefined behavior at runtime auto c8 = QChar::fromUcs4(0x1D11E); // always OK auto c9 = QChar::fromUcs4(U'\U0001D11E'); // always OK // => use c8/c9 as QStringView objects
该函数在 Qt 6.0 引入。
另请参阅 QLatin1Char , QChar::fromUcs4 ,和 QT_NO_CAST_FROM_ASCII .