QStandardItemModel类中的函数
bool setData(const QModelIndex &index,
const QVariant &value,
int role = Qt::EditRole) Q_DECL_OVERRIDE;
中有一个QVariant类型变量。
QVariant类类似于C++联合(union)数据类型,它不仅能够保存很多Qt类型的值,包括QColor,QBrush,QFont,QPen,QString和QSize等,也能够存放Qt的容器类型的值。Qt的很多功能都是建立在QVariant基础上的,如Qt的对象属性及数据库功能等。
DEMO
#include "widget.h"
#include
#include
#include
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QVariant v(709);
qDebug()<map;
map["int"]=709;
map["double"]=709.709;
map["string"]="how are you!"; //输入字符串
map["color"]=QColor(255,0,0);
//调用相应的转换函数并输出
qDebug()<
运行结果
Qt的常用QVariant::type枚举类型变量
Invalid = QMetaType::UnknownType,
Bool = QMetaType::Bool,
Int = QMetaType::Int,
UInt = QMetaType::UInt,
LongLong = QMetaType::LongLong,
ULongLong = QMetaType::ULongLong,
Double = QMetaType::Double,
Char = QMetaType::QChar,
Map = QMetaType::QVariantMap,
List = QMetaType::QVariantList,
String = QMetaType::QString,
StringList = QMetaType::QStringList,
ByteArray = QMetaType::QByteArray,
BitArray = QMetaType::QBitArray,
Date = QMetaType::QDate,
Time = QMetaType::QTime,
DateTime = QMetaType::QDateTime,
Url = QMetaType::QUrl,
Locale = QMetaType::QLocale,
Rect = QMetaType::QRect,
RectF = QMetaType::QRectF,
Size = QMetaType::QSize,
SizeF = QMetaType::QSizeF,
Line = QMetaType::QLine,
LineF = QMetaType::QLineF,
Point = QMetaType::QPoint,
PointF = QMetaType::QPointF,
RegExp = QMetaType::QRegExp,
RegularExpression = QMetaType::QRegularExpression,
Hash = QMetaType::QVariantHash,
EasingCurve = QMetaType::QEasingCurve,
Uuid = QMetaType::QUuid,
ModelIndex = QMetaType::QModelIndex,
PersistentModelIndex = QMetaType::QPersistentModelIndex,
LastCoreType = QMetaType::LastCoreType,
Font = QMetaType::QFont,
Pixmap = QMetaType::QPixmap,
Brush = QMetaType::QBrush,
Color = QMetaType::QColor,
Palette = QMetaType::QPalette,
Image = QMetaType::QImage,
Polygon = QMetaType::QPolygon,
Region = QMetaType::QRegion,
Bitmap = QMetaType::QBitmap,
Cursor = QMetaType::QCursor,
KeySequence = QMetaType::QKeySequence,
Pen = QMetaType::QPen,
TextLength = QMetaType::QTextLength,
TextFormat = QMetaType::QTextFormat,
Matrix = QMetaType::QMatrix,
Transform = QMetaType::QTransform,
Matrix4x4 = QMetaType::QMatrix4x4,
Vector2D = QMetaType::QVector2D,
Vector3D = QMetaType::QVector3D,
Vector4D = QMetaType::QVector4D,
Quaternion = QMetaType::QQuaternion,
PolygonF = QMetaType::QPolygonF,
Icon = QMetaType::QIcon,
LastGuiType = QMetaType::LastGuiType,
SizePolicy = QMetaType::QSizePolicy,
UserType = QMetaType::User,
LastType = 0xffffffff // need this so that gcc >= 3.4 allocates 32 bits for Type
页面更新:2024-03-06
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