The QMetaEnum 類提供枚舉器的有關元數據。 更多...
| 頭： | #include <QMetaEnum> |
| qmake: | QT += core |
| const char * | enumName () const |
| bool | isFlag () const |
| bool | isScoped () const |
| bool | isValid () const |
| const char * | key (int index ) const |
| int | keyCount () const |
| int | keyToValue (const char * key , bool * ok = nullptr) const |
| int | keysToValue (const char * keys , bool * ok = nullptr) const |
| const char * | name () const |
| const char * | scope () const |
| int | value (int index ) const |
| const char * | valueToKey (int value ) const |
| QByteArray | valueToKeys (int value ) const |
| QMetaEnum | fromType () |
The QMetaEnum 類提供枚舉器的有關元數據。
使用 name () for the enumerator's name. The enumerator's keys (names of each enumerated item) are returned by key ()；使用 keyCount () 能查找按鍵數。 isFlag () returns whether the enumerator is meant to be used as a flag, meaning that its values can be combined using the OR operator.
The conversion functions keyToValue (), valueToKey (), keysToValue ()，和 valueToKeys () allow conversion between the integer representation of an enumeration or set value and its literal representation. The scope () function returns the class scope this enumerator was declared in.
另請參閱 QMetaObject , QMetaMethod ，和 QMetaProperty .
返迴標誌的枚舉名稱 (在作用域外)。
例如，
Qt::AlignmentFlag
標誌擁有
AlignmentFlag
作為枚舉名稱，但
Alignment
as as the type name. Non flag enums has the same type and enum names.
枚舉名稱擁有如類型名稱的相同作用域。
該函數在 Qt 5.12 引入。
[static]
QMetaEnum
QMetaEnum::
fromType
()
返迴 QMetaEnum corresponding to the type in the template parameter. The enum needs to be declared with Q_ENUM .
該函數在 Qt 5.5 引入。
返迴
true
若此枚舉器被用作標誌；否則返迴 false。
When used as flags, enumerators can be combined using the OR operator.
另請參閱 keysToValue () 和 valueToKeys ().
返迴
true
if this enumerator is declared as a C++11 enum class; otherwise returns false.
該函數在 Qt 5.8 引入。
返迴
true
if this enum is valid (has a name); otherwise returns false.
另請參閱 name ().
Returns the key with the given index , or 0 if no such key exists.
另請參閱 keyCount (), value ()，和 valueToKey ().
返迴按鍵數。
另請參閱 key ().
Returns the integer value of the given enumeration key ，或 -1 若 key 未定義。
若 key is not defined, * ok is set to false; otherwise * ok 被設為 true。
對於標誌類型，使用 keysToValue ().
另請參閱 valueToKey (), isFlag ()，和 keysToValue ().
Returns the value derived from combining together the values of the keys using the OR operator, or -1 if keys is not defined. Note that the strings in keys must be '|'-separated.
若 keys is not defined, * ok is set to false; otherwise * ok 被設為 true。
另請參閱 isFlag (), valueToKey ()，和 valueToKeys ().
Returns the name of the type (without the scope).
例如，
Qt::Key
枚舉擁有
Key
as the type name and
Qt
as the scope.
For flags this returns the name of the flag type, not the name of the enum type.
另請參閱 isValid (), scope ()，和 enumName ().
Returns the scope this enumerator was declared in.
例如，
Qt::AlignmentFlag
枚舉擁有
Qt
as the scope and
AlignmentFlag
as the name.
另請參閱 name ().
Returns the value with the given index ; or returns -1 if there is no such value.
另請參閱 keyCount (), key ()，和 keyToValue ().
Returns the string that is used as the name of the given enumeration value , or 0 if value 未定義。
對於標誌類型，使用 valueToKeys ().
另請參閱 isFlag () 和 valueToKeys ().
Returns a byte array of '|'-separated keys that represents the given value .
另請參閱 isFlag (), valueToKey ()，和 keysToValue ().