# QKeyEvent Class Reference
## [[QtGui](index.htm) module]
该QKeyEvent类描述了一个关键事件。[More...](#details)
继承[QInputEvent](qinputevent.html)。
### Methods
* `__init__ (self, QEvent.Type type, int key, Qt.KeyboardModifiers modifiers, QString text = QString(), bool autorep = False, int count = 1)`
* `__init__ (self, QKeyEvent)`
* `int count (self)`
* `bool isAutoRepeat (self)`
* `int key (self)`
* `bool matches (self, QKeySequence.StandardKey key)`
* `Qt.KeyboardModifiers modifiers (self)`
* `int nativeModifiers (self)`
* `int nativeScanCode (self)`
* `int nativeVirtualKey (self)`
* `QString text (self)`
### Special Methods
* `bool __eq__ (self, QKeySequence.StandardKey key)`
* `__len__ (self)`
* `bool __ne__ (self, QKeySequence.StandardKey key)`
* * *
## Detailed Description
该QKeyEvent类描述了一个关键事件。
当按键按下或释放键事件发送到窗口小部件与键盘输入焦点。
一个关键的事件包含一个特殊的接受标志,指示接收者是否将处理按键事件。你应该调用[ignore](qevent.html#ignore)( )如果键按下或释放事件不是由您的Widget处理。一个关键的事件被传播到父控件链,直到一个小部件接受它[accept](qevent.html#accept)( )或事件过滤器会消耗它。多媒体键的按键事件在默认情况下忽略。你应该调用[accept](qevent.html#accept)()如果你的widget处理这些事件。
该QWidget.setEnable ()函数可以被用来使能或禁止鼠标和键盘事件为一个部件。
该事件处理程序[QWidget.keyPressEvent](qwidget.html#keyPressEvent)( )[QWidget.keyReleaseEvent](qwidget.html#keyReleaseEvent)( )[QGraphicsItem.keyPressEvent](qgraphicsitem.html#keyPressEvent)()和[QGraphicsItem.keyReleaseEvent](qgraphicsitem.html#keyReleaseEvent)( )接收按键事件。
* * *
## Method Documentation
```
QKeyEvent.__init__ (self, QEvent.Type type, int key, Qt.KeyboardModifiers modifiers, QString text = QString(), bool autorep = False, int count = 1)
```
构造一个关键的事件对象。
该_type_参数必须是[QEvent.KeyPress](qevent.html#Type-enum),[QEvent.KeyRelease](qevent.html#Type-enum)或[QEvent.ShortcutOverride](qevent.html#Type-enum)。
诠释_key_对于代码[Qt.Key](qt.html#Key-enum)该事件循环应该倾听。如果_key_为0时,该事件是不是一个已知的密钥的结果,例如,它可能是一个写作顺序或键盘宏的结果。该_modifiers_保持键盘功能键,并在给定_text_是,密钥生成的Unicode文本。如果_autorep_是真的,[isAutoRepeat](qkeyevent.html#isAutoRepeat)( )将是真实的。_count_是参与事件的键的数目。
```
QKeyEvent.__init__ (self, QKeyEvent)
```
```
int QKeyEvent.count (self)
```
返回与此事件相关的键的数目。如果[text](qkeyevent.html#text)( )不是空的,这简直是字符串的长度。
**See also** [Qt.WA_KeyCompression](qt.html#WidgetAttribute-enum)。
```
bool QKeyEvent.isAutoRepeat (self)
```
返回True如果此事件来自一个自动重复键,如果它来自一个初始的按键返回False。
注意,如果事件是一个多键压缩事件的部分原因是自动重复,这个函数可以返回True或False不定。
```
int QKeyEvent.key (self)
```
返回按下或释放的键的代码。
See [Qt.Key](qt.html#Key-enum)供的键盘代码的列表。这些代码是独立于底层窗口系统。请注意,这个函数不资本和非大写字母区分,使用[text](qkeyevent.html#text)( )函数(返回按键产生的Unicode文本)用于这一目的。
0或值[Qt.Key_unknown](qt.html#Key-enum)表示该事件是不是一个已知的密钥的结果,例如,它可能是一个写作顺序,键盘宏,或者由于关键事件的压缩的结果。
**See also** [Qt.WA_KeyCompression](qt.html#WidgetAttribute-enum)。
```
bool QKeyEvent.matches (self, QKeySequence.StandardKey key)
```
如果关键事件的给定标准匹配,则返回True_key_否则返回False 。
这个函数中引入了Qt 4.2中。
```
Qt.KeyboardModifiers QKeyEvent.modifiers (self)
```
[
返回立即存在的事件发生后,键盘修饰符标志。
**Warning:**此功能不能总是可信的。用户可以通过同时按下混淆**Shift**键同时释放其中的一个,例如。
](index.htm)
[**See also**](index.htm) [QApplication.keyboardModifiers](qapplication.html#keyboardModifiers)( ) 。
```
int QKeyEvent.nativeModifiers (self)
```
返回一个关键的事件的本地修饰符。如果关键事件中不包含此数据,则返回0 。
注意:本机调节剂可以是0 ,即使键事件包含的扩展信息。
这个函数中引入了Qt 4.2中。
```
int QKeyEvent.nativeScanCode (self)
```
返回键事件的本机扫描码。如果关键事件中不包含此数据,则返回0 。
注:本机扫描码可能为0 ,即使关键事件包含的扩展信息。
注意:在Mac OS / X ,这个功能是没有用的,因为没有办法从碳或可可得到扫描码。该函数总是返回1(或0的情况下上面所解释的) 。
这个函数中引入了Qt 4.2中。
```
int QKeyEvent.nativeVirtualKey (self)
```
返回本机的虚拟键或按键事件的键对称。如果关键事件中不包含此数据,则返回0 。
注意:本机虚拟键可以是0 ,即使键事件包含的扩展信息。
这个函数中引入了Qt 4.2中。
```
QString QKeyEvent.text (self)
```
返回Unicode文本,这个密钥生成。返回的文本可以在修饰键,如Shift键,控制,Alt和梅塔,被按下或释放的情况下,一个空字符串。在这种情况下[key](qkeyevent.html#key)( )将包含一个有效的值。
**See also** [Qt.WA_KeyCompression](qt.html#WidgetAttribute-enum)。
```
bool QKeyEvent.__eq__ (self, QKeySequence.StandardKey key)
```
```
QKeyEvent.__len__ (self)
```
```
bool QKeyEvent.__ne__ (self, QKeySequence.StandardKey key)
```
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- 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