# QDeclarativeProperty Class Reference
## [[QtDeclarative](index.htm) module]
该QDeclarativeProperty类文摘从QML创建的对象访问属性。[More...](#details)
### Types
* `enum PropertyTypeCategory { InvalidCategory, List, Object, Normal }`
* `enum Type { Invalid, Property, SignalProperty }`
### Methods
* `__init__ (self)`
* `__init__ (self, QObject)`
* `__init__ (self, QObject, QDeclarativeContext)`
* `__init__ (self, QObject, QDeclarativeEngine)`
* `__init__ (self, QObject, QString)`
* `__init__ (self, QObject, QString, QDeclarativeContext)`
* `__init__ (self, QObject, QString, QDeclarativeEngine)`
* `__init__ (self, QDeclarativeProperty)`
* `bool connectNotifySignal (self, QObject dest, SLOT()SLOT() slot)`
* `bool connectNotifySignal (self, callable dest)`
* `bool connectNotifySignal (self, QObject dest, int method)`
* `bool hasNotifySignal (self)`
* `int index (self)`
* `bool isDesignable (self)`
* `bool isProperty (self)`
* `bool isResettable (self)`
* `bool isSignalProperty (self)`
* `bool isValid (self)`
* `bool isWritable (self)`
* `QMetaMethod method (self)`
* `QString name (self)`
* `bool needsNotifySignal (self)`
* `QObject object (self)`
* `QMetaProperty property (self)`
* `int propertyType (self)`
* `PropertyTypeCategory propertyTypeCategory (self)`
* `str propertyTypeName (self)`
* `QVariant read (self)`
* `bool reset (self)`
* `Type type (self)`
* `bool write (self, QVariant)`
### Static Methods
* `QVariant read (QObject, QString)`
* `QVariant read (QObject, QString, QDeclarativeContext)`
* `QVariant read (QObject, QString, QDeclarativeEngine)`
* `bool write (QObject, QString, QVariant)`
* `bool write (QObject, QString, QVariant, QDeclarativeContext)`
* `bool write (QObject, QString, QVariant, QDeclarativeEngine)`
### Special Methods
* `bool __eq__ (self, QDeclarativeProperty)`
* `int __hash__ (self)`
* `bool __ne__ (self, QDeclarativeProperty)`
* * *
## Detailed Description
该QDeclarativeProperty类文摘从QML创建的对象访问属性。
由于QML使用Qt的元类型系统中所有现有的[QMetaObject](qmetaobject.html)类可以用来反思,并与QML创建的对象进行交互。然而,一些通过QML提供的新功能 - 如类型安全和附加属性 - 是最容易通过简化他们的一些自然的复杂性QDeclarativeProperty类中使用。
不像[QMetaProperty](qmetaproperty.html)它代表一个类类型的属性, QDeclarativeProperty封装在一个特定的对象实例的属性。要读取一个属性值,程序员创建一个QDeclarativeProperty实例,并调用[read](qdeclarativeproperty.html#read)()方法。同样写一个属性值[write](qdeclarativeproperty.html#write)()方法被使用。
例如,对于下面的QML代码:
```
// MyItem.qml
import QtQuick 1.0
[Text](index.htm) { text: "A bit of text" }
```
该[Text](index.htm)对象的属性可以用QDeclarativeProperty进行访问,如下所示:
```
#include <QDeclarativeProperty>
#include <QGraphicsObject>
...
[QDeclarativeView](qdeclarativeview.html) view([QUrl](qurl.html).fromLocalFile("MyItem.qml"));
QDeclarativeProperty property(view.rootObject(), "font.pixelSize");
qWarning() << "Current pixel size:" << property.read().toInt();
property.write(24);
qWarning() << "Pixel size should now be 24:" << property.read().toInt();
```
* * *
## Type Documentation
```
QDeclarativeProperty.PropertyTypeCategory
```
此枚举指定一个类别的QML属性。
| Constant | Value | Description |
| --- | --- | --- |
| `QDeclarativeProperty.InvalidCategory` | `0` | 该属性是无效的,或者是一个信号特性。 |
| `QDeclarativeProperty.List` | `1` | 该属性是一个[QDeclarativeListProperty](index.htm)列表属性 |
| `QDeclarativeProperty.Object` | `2` | 该属性是一个[QObject](qobject.html)派生类型的指针 |
| `QDeclarativeProperty.Normal` | `3` | 该属性是一个正常的值属性。 |
```
QDeclarativeProperty.Type
```
此枚举指定类型QML属性。
| Constant | Value | Description |
| --- | --- | --- |
| `QDeclarativeProperty.Invalid` | `0` | 该属性无效。 |
| `QDeclarativeProperty.Property` | `1` | 该属性是一个普通的Qt属性。 |
| `QDeclarativeProperty.SignalProperty` | `2` | 该属性是一个信号特性。 |
* * *
## Method Documentation
```
QDeclarativeProperty.__init__ (self)
```
创建一个无效的[QDeclarativeProperty](qdeclarativeproperty.html)。
```
QDeclarativeProperty.__init__ (self, QObject)
```
创建[QDeclarativeProperty](qdeclarativeproperty.html)为默认属性_obj_。如果没有默认属性,无效[QDeclarativeProperty](qdeclarativeproperty.html)将被创建。
```
QDeclarativeProperty.__init__ (self, QObject, QDeclarativeContext)
```
创建[QDeclarativeProperty](qdeclarativeproperty.html)为默认属性_obj_使用[context](qdeclarativecontext.html) _ctxt_。如果没有默认属性,无效[QDeclarativeProperty](qdeclarativeproperty.html)将被创建。
```
QDeclarativeProperty.__init__ (self, QObject, QDeclarativeEngine)
```
创建[QDeclarativeProperty](qdeclarativeproperty.html)为默认属性_obj_使用环境的实例,是由提供的QML组件_engine_。如果没有默认属性,无效[QDeclarativeProperty](qdeclarativeproperty.html)将被创建。
```
QDeclarativeProperty.__init__ (self, QObject, QString)
```
创建[QDeclarativeProperty](qdeclarativeproperty.html)该物业_name_的_obj_。
```
QDeclarativeProperty.__init__ (self, QObject, QString, QDeclarativeContext)
```
创建[QDeclarativeProperty](qdeclarativeproperty.html)该物业_name_的_obj_使用[context](qdeclarativecontext.html) _ctxt_。
创建[QDeclarativeProperty](qdeclarativeproperty.html)没有上下文会使一些特性 - 像附加属性 - 无法访问。
```
QDeclarativeProperty.__init__ (self, QObject, QString, QDeclarativeEngine)
```
创建[QDeclarativeProperty](qdeclarativeproperty.html)该物业_name_的_obj_使用环境的实例,是由提供的QML组件_engine_。
```
QDeclarativeProperty.__init__ (self, QDeclarativeProperty)
```
创建副本_other_。
```
bool QDeclarativeProperty.connectNotifySignal (self, QObject dest, SLOT()SLOT() slot)
```
该属性的改变通知信号连接到指定的_slot_的_dest_对象并返回True 。返回False,如果该元属性并不代表定期Qt的属性,或者如果它没有改变通知信号,或者如果_dest_对象不具有指定的_slot_。
```
bool QDeclarativeProperty.connectNotifySignal (self, callable dest)
```
该属性的改变通知信号连接到指定的_method_的_dest_对象并返回True 。返回False,如果该元属性并不代表定期Qt的属性,或者如果它没有改变通知信号,或者如果_dest_对象不具有指定的_method_。
```
bool QDeclarativeProperty.connectNotifySignal (self, QObject dest, int method)
```
```
bool QDeclarativeProperty.hasNotifySignal (self)
```
如果属性有改变通知信号,否则为False ,则返回True 。
```
int QDeclarativeProperty.index (self)
```
返回属性的Qt的元对象的索引。
```
bool QDeclarativeProperty.isDesignable (self)
```
返回True,如果属性是可设计的,否则为False 。
```
bool QDeclarativeProperty.isProperty (self)
```
返回True如果[QDeclarativeProperty](qdeclarativeproperty.html)代表一个普通的Qt属性。
```
bool QDeclarativeProperty.isResettable (self)
```
返回True,如果属性是可复位,否则为False 。
```
bool QDeclarativeProperty.isSignalProperty (self)
```
返回True如果[QDeclarativeProperty](qdeclarativeproperty.html)代表一个QML信号特性。
```
bool QDeclarativeProperty.isValid (self)
```
返回True如果[QDeclarativeProperty](qdeclarativeproperty.html)指的是一个有效的属性,否则为False 。
```
bool QDeclarativeProperty.isWritable (self)
```
返回True,如果属性是可写的,否则为False 。
```
QMetaMethod QDeclarativeProperty.method (self)
```
[](qmetamethod.html)
[返回](qmetamethod.html)[QMetaMethod](qmetamethod.html)这个属性,如果它是一个[SignalProperty](qdeclarativeproperty.html#Type-enum),否则返回一个无效的[QMetaMethod](qmetamethod.html)。
```
QString QDeclarativeProperty.name (self)
```
返回此QML属性的名称。
```
bool QDeclarativeProperty.needsNotifySignal (self)
```
如果该属性需要改变通知信号绑定保持upto日期,否则返回False ,则返回True 。
某些属性,如附加属性或那些值永远不会改变,不需要改变通知。
```
QObject QDeclarativeProperty.object (self)
```
[](qobject.html)
[返回](qobject.html)[QDeclarativeProperty](qdeclarativeproperty.html)的[QObject](qobject.html)。
```
QMetaProperty QDeclarativeProperty.property (self)
```
[](qmetaproperty.html)
[返回](qmetaproperty.html)[Qt property](qmetaproperty.html)与此QML属性相关联。
```
int QDeclarativeProperty.propertyType (self)
```
返回[QVariant](qvariant.html)类型的财产,或[QVariant.Invalid](qvariant.html#Type-enum)如果该属性没有[QVariant](qvariant.html)类型。
```
PropertyTypeCategory QDeclarativeProperty.propertyTypeCategory (self)
```
[
返回属性类别。
```
str QDeclarativeProperty.propertyTypeName (self)
```
返回属性的类型名称,或者0,如果属性没有类型名称。
```
QVariant QDeclarativeProperty.read (self)
```
返回的属性值。
```
QVariant QDeclarativeProperty.read (QObject, QString)
```
返回_name_物业价值_object_。此方法等效于:
](qdeclarativeproperty.html#PropertyTypeCategory-enum)
```
QDeclarativeProperty p(object, name);
p.read();
```
```
QVariant QDeclarativeProperty.read (QObject, QString, QDeclarativeContext)
```
返回_name_物业价值_object_使用[context](qdeclarativecontext.html) _ctxt_。此方法等效于:
```
[QDeclarativeProperty](qdeclarativeproperty.html) p(object, name, context);
p.read();
```
```
QVariant QDeclarativeProperty.read (QObject, QString, QDeclarativeEngine)
```
返回_name_物业价值_object_使用环境的实例,是由提供的QML组件_engine_。 。此方法等效于:
```
[QDeclarativeProperty](qdeclarativeproperty.html) p(object, name, engine);
p.read();
```
```
bool QDeclarativeProperty.reset (self)
```
重置属性,如果属性是可复位返回True 。如果该属性是无法确认,没有任何反应并返回False 。
```
Type QDeclarativeProperty.type (self)
```
[
返回属性的类型。
```
bool QDeclarativeProperty.write (self, QVariant)
```
属性值设置为_value_并返回True 。返回False,如果该属性不能被设置,因为_value_是错误的类型,例如。
```
bool QDeclarativeProperty.write (QObject, QString, QVariant)
```
Writes _value_到_name_物业_object_。此方法等效于:
](qdeclarativeproperty.html#Type-enum)
```
QDeclarativeProperty p(object, name);
p.write(value);
```
```
bool QDeclarativeProperty.write (QObject, QString, QVariant, QDeclarativeContext)
```
Writes _value_到_name_物业_object_使用[context](qdeclarativecontext.html) _ctxt_。此方法等效于:
```
[QDeclarativeProperty](qdeclarativeproperty.html) p(object, name, ctxt);
p.write(value);
```
```
bool QDeclarativeProperty.write (QObject, QString, QVariant, QDeclarativeEngine)
```
Writes _value_到_name_物业_object_使用环境的实例,是由提供的QML组件_engine_。此方法等效于:
```
[QDeclarativeProperty](qdeclarativeproperty.html) p(object, name, engine);
p.write(value);
```
```
bool QDeclarativeProperty.__eq__ (self, QDeclarativeProperty)
```
```
int QDeclarativeProperty.__hash__ (self)
```
```
bool QDeclarativeProperty.__ne__ (self, QDeclarativeProperty)
```
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- QScriptClassPropertyIterator Class Reference
- QScriptContext Class Reference
- QScriptContextInfo Class Reference
- QScriptEngine Class Reference
- QScriptEngineAgent Class Reference
- QScriptEngineDebugger Class Reference
- QScriptString Class Reference
- QScriptSyntaxCheckResult Class Reference
- QScriptValue Class Reference
- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译:Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference