QChar 类提供 16 位 Unicode 字符。 更多...
This class can be pickled.
QChar 类提供 16 位 Unicode 字符。
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 a 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. 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.
QChar also provides direction (), which indicates the "natural" writing direction of this character. The joining () function indicates how the character joins with its neighbors (needed mostly for Arabic) and finally hasMirrored (), which indicates whether the character needs to be mirrored when it is printed in its "unnatural" writing direction.
Composed Unicode characters (like å) 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 构造函数。
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 fromAscii () 或 fromLatin1 (), or use QLatin1Char , to construct a QChar from an 8 位 char , and you will need to call toAscii () 或 toLatin1 () to get the 8-bit value back.
This enum maps the Unicode character categories.
The following characters are normative in Unicode:
| 常量 | 值 | 描述 |
|---|---|---|
| QChar.Mark_NonSpacing | 1 | Unicode class name Mn |
| QChar.Mark_SpacingCombining | 2 | Unicode class name Mc |
| QChar.Mark_Enclosing | 3 | Unicode class name Me |
| QChar.Number_DecimalDigit | 4 | Unicode class name Nd |
| QChar.Number_Letter | 5 | Unicode class name Nl |
| QChar.Number_Other | 6 | Unicode class name No |
| QChar.Separator_Space | 7 | Unicode class name Zs |
| QChar.Separator_Line | 8 | Unicode class name Zl |
| QChar.Separator_Paragraph | 9 | Unicode class name Zp |
| QChar.Other_Control | 10 | Unicode class name Cc |
| QChar.Other_Format | 11 | Unicode class name Cf |
| QChar.Other_Surrogate | 12 | Unicode class name Cs |
| QChar.Other_PrivateUse | 13 | Unicode class name Co |
| QChar.Other_NotAssigned | 14 | Unicode class name Cn |
The following categories are informative in Unicode:
| 常量 | 值 | 描述 |
|---|---|---|
| QChar.Letter_Uppercase | 15 | Unicode class name Lu |
| QChar.Letter_Lowercase | 16 | Unicode class name Ll |
| QChar.Letter_Titlecase | 17 | Unicode class name Lt |
| QChar.Letter_Modifier | 18 | Unicode class name Lm |
| QChar.Letter_Other | 19 | Unicode class name Lo |
| QChar.Punctuation_Connector | 20 | Unicode class name Pc |
| QChar.Punctuation_Dash | 21 | Unicode class name Pd |
| QChar.Punctuation_Open | 22 | Unicode class name Ps |
| QChar.Punctuation_Close | 23 | Unicode class name Pe |
| QChar.Punctuation_InitialQuote | 24 | Unicode class name Pi |
| QChar.Punctuation_FinalQuote | 25 | Unicode class name Pf |
| QChar.Punctuation_Other | 26 | Unicode class name Po |
| QChar.Symbol_Math | 27 | Unicode class name Sm |
| QChar.Symbol_Currency | 28 | Unicode class name Sc |
| QChar.Symbol_Modifier | 29 | Unicode class name Sk |
| QChar.Symbol_Other | 30 | Unicode class name So |
| QChar.NoCategory | 0 | Qt cannot find an appropriate category for the character. |
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 |
|---|---|
| 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.DirL | 0 |
| QChar.DirLRE | 11 |
| QChar.DirLRO | 12 |
| QChar.DirNSM | 17 |
| QChar.DirON | 10 |
| QChar.DirPDF | 16 |
| QChar.DirR | 1 |
| QChar.DirRLE | 14 |
| QChar.DirRLO | 15 |
| QChar.DirS | 8 |
| QChar.DirWS | 9 |
另请参阅 direction ().
This enum type defines the Unicode joining attributes. See the Unicode Standard for a description of the values.
| 常量 | 值 |
|---|---|
| QChar.Center | 3 |
| QChar.Dual | 1 |
| QChar.OtherJoining | 0 |
| QChar.Right | 2 |
另请参阅 joining ().
| 常量 | 值 | 描述 |
|---|---|---|
| QChar.Null | 0x0000 | A QChar with this value isNull (). |
| QChar.Nbsp | 0x00a0 | Non-breaking space. |
| 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 |
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_Unassigned | 0 | The value is not assigned to any character in version 5.0 of Unicode. |
另请参阅 unicodeVersion ().
Constructs a null QChar ('\0').
另请参阅 isNull ().
构造 QChar corresponding to ASCII/Latin-1 character ch .
构造 QChar corresponding to ASCII/Latin-1 character ch .
构造 QChar corresponding to ASCII/Latin-1 character ch .
构造 QChar for Unicode cell cell in row row .
构造 QChar for the character with Unicode code point code .
构造 QChar for the character with Unicode code point code .
Returns the character's category.
这是重载函数。
Returns the category of the UCS-4-encoded character specified by ucs4 .
该函数在 Qt 4.3 引入。
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.
这是重载函数。
Returns the combining class for the UCS-4-encoded character 指定通过 ucs4 , as defined in the Unicode standard.
Returns the most recent supported Unicode version.
该函数在 Qt 4.8 引入。
Decomposes a character into its parts. Returns an empty string if no decomposition exists.
这是重载函数。
Decomposes the UCS-4-encoded character specified by ucs4 into its constituent parts. Returns an empty string if no decomposition exists.
Returns the tag defining the composition of the character. 返回 QChar.Single if no decomposition exists.
这是重载函数。
Returns the tag defining the composition of the UCS-4-encoded character specified by ucs4 。返回 QChar.Single if no decomposition exists.
Returns the numeric value of the digit, or -1 if the character is not a digit.
这是重载函数。
Returns the numeric value of the digit, specified by the UCS-2-encoded character, ucs2 , or -1 if the character is not a digit.
Returns the character's direction.
这是重载函数。
Returns the direction of the UCS-4-encoded character specified by ucs4 .
Converts the ASCII character c to its equivalent QChar . This is mainly useful for non-internationalized software.
An alternative is to use QLatin1Char .
另请参阅 fromLatin1 (), unicode ()，和 QTextCodec.codecForCStrings ().
Converts the Latin-1 character c to its equivalent QChar . This is mainly useful for non-internationalized software.
另请参阅 fromAscii (), unicode ()，和 QTextCodec.codecForCStrings ().
Returns true if the character should be reversed if the text direction is reversed; otherwise returns false.
Same as (ch. mirroredChar () != ch).
另请参阅 mirroredChar ().
Returns the high surrogate value of a ucs4 code point. The returned result is undefined if ucs4 小于 0x10000.
Returns true if the character is a decimal digit ( Number_DecimalDigit ); otherwise returns false.
返回 true 若 QChar is the high part of a utf16 surrogate (ie. if its code point is between 0xd800 and 0xdbff, inclusive).
Returns true if the UCS-4-encoded character specified by ucs4 is the high part of a utf16 surrogate (ie. if its code point is between 0xd800 and 0xdbff, inclusive).
该函数在 Qt 4.7 引入。
Returns true if the character is a letter (Letter_* categories); otherwise returns false.
Returns true if the character is a letter or number (Letter_* or Number_ * categories); otherwise returns false.
Returns true if the character is a lowercase letter, i.e. category () 是 Letter_Lowercase .
另请参阅 isUpper (), toLower ()，和 toUpper ().
返回 true 若 QChar is the low part of a utf16 surrogate (ie. if its code point is between 0xdc00 and 0xdfff, inclusive).
Returns true if the UCS-4-encoded character specified by ucs4 is the low part of a utf16 surrogate (ie. if its code point is between 0xdc00 and 0xdfff, inclusive).
该函数在 Qt 4.7 引入。
Returns true if the character is a mark (Mark_* categories); otherwise returns false.
见 QChar.Category for more information regarding marks.
Returns true if the character is the Unicode character 0x0000 ('\0'); otherwise returns false.
Returns true if the character is a number ( Number_ * categories, not just 0-9); otherwise returns false.
另请参阅 isDigit ().
Returns true if the character is a printable character; otherwise returns false. This is any character not of category Cc or Cn.
Note that this gives no indication of whether the character is available in a particular font.
Returns true if the character is a punctuation mark (Punctuation_* categories); otherwise returns false.
Returns true if the character is a separator character (Separator_* categories); otherwise returns false.
Returns true if the character is a symbol (Symbol_* categories); otherwise returns false.
Returns true if the character is a titlecase letter, i.e. category () 是 Letter_Titlecase .
该函数在 Qt 4.3 引入。
另请参阅 isLower (), toUpper (), toLower ()，和 toTitleCase ().
Returns true if the character is an uppercase letter, i.e. category () 是 Letter_Uppercase .
另请参阅 isLower (), toUpper ()，和 toLower ().
Returns information about the joining properties of the character (needed for certain languages such as Arabic).
这是重载函数。
Returns information about the joining properties of the UCS-4-encoded character specified by ucs4 (needed for certain languages such as Arabic).
Returns the low surrogate value of a ucs4 code point. The returned result is undefined if ucs4 小于 0x10000.
Returns the mirrored character if this character is a mirrored character; otherwise returns the character itself.
另请参阅 hasMirrored ().
这是重载函数。
Returns the mirrored character if the UCS-4-encoded character 指定通过 ucs4 is a mirrored character; otherwise returns the character itself.
另请参阅 hasMirrored ().
Returns true if the UCS-4-encoded character specified by ucs4 can be split into the high and low parts of a utf16 surrogate (ie. if its code point is greater than or equals to 0x10000).
该函数在 Qt 4.7 引入。
Returns the row (most significant byte) of the Unicode character.
另请参阅 cell ().
Converts a UTF16 surrogate pair with the given high and low values to its UCS-4 code point.
Converts a utf16 surrogate pair ( high , low ) to its ucs4 code point.
Returns the character value of the QChar obtained using the current codec used to read C strings, or 0 if the character is not representable using this codec. The default codec handles Latin-1 encoded text, but this can be changed to assist developers writing source code using other encodings.
The main purpose of this function is to preserve ASCII characters used in C strings. This is mainly useful for developers of non-internationalized software.
另请参阅 toLatin1 (), unicode ()，和 QTextCodec.codecForCStrings ().
Returns the case folded equivalent of the character. For most Unicode characters this is the same as toLowerCase().
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 toLowerCase().
Returns the Latin-1 character equivalent to the QChar , or 0. This is mainly useful for non-internationalized software.
另请参阅 toAscii (), unicode ()，和 QTextCodec.codecForCStrings ().
Returns the lowercase equivalent if the character is uppercase or titlecase; otherwise returns the character itself.
这是重载函数。
Returns the lowercase equivalent of the UCS-4-encoded character 指定通过 ucs4 if the character is uppercase or titlecase; otherwise returns the character itself.
Returns the title case equivalent if the character is lowercase or uppercase; otherwise returns the character itself.
这是重载函数。
Returns the title case equivalent of the UCS-4-encoded character 指定通过 ucs4 if the character is lowercase or uppercase; otherwise returns the character itself.
Returns the uppercase equivalent if the character is lowercase or titlecase; otherwise returns the character itself.
这是重载函数。
Returns the uppercase equivalent of the UCS-4-encoded character 指定通过 ucs4 if the character is lowercase or titlecase; otherwise returns the character itself.
Returns a reference to the numeric Unicode value of the QChar .
Returns the Unicode version that introduced this character.
这是重载函数。
Returns the Unicode version that introduced the character specified in its UCS-4-encoded form as ucs4 .
