# QInputMethodEvent Class Reference
## [[QtGui](index.htm) module]
該QInputMethodEvent類提供了輸入法的事件參數。[More...](#details)
繼承[QEvent](qevent.html)。
### Types
* `class **[Attribute](index.htm)**`
* `enum AttributeType { TextFormat, Cursor, Language, Ruby, Selection }`
### Methods
* `__init__ (self)`
* `__init__ (self, QString?preeditText, list-of-QInputMethodEvent.Attribute?attributes)`
* `__init__ (self, QInputMethodEvent?other)`
* `list-of-QInputMethodEvent.Attribute attributes (self)`
* `QString commitString (self)`
* `QString preeditString (self)`
* `int replacementLength (self)`
* `int replacementStart (self)`
* `setCommitString (self, QString?commitString, int?from?=?0, int?length?=?0)`
* * *
## Detailed Description
該QInputMethodEvent類提供了輸入法的事件參數。
輸入法事件發送到窗口部件時，輸入法來輸入文本的小工具。輸入法被廣泛用于輸入文字與非拉丁字母的語言。
請注意，創建自定義的文本編輯窗口部件時，該[Qt.WA_InputMethodEnabled](qt.html#WidgetAttribute-enum)窗口屬性必須顯式設置（使用[QWidget.setAttribute](qwidget.html#setAttribute)（ ）函數） ，以便接收輸入方法事件。
該事件感興趣的人誰不想能正確處理復雜的文字輸入語言的鍵盤輸入部件的作者。在這樣的語言的文本輸入通常是三個步驟：
1. **Starting to Compose**
當用戶按下鍵盤上的第一鍵，輸入上下文被創建。該輸入上下文將包含鍵入的字符的字符串。
2. **Composing**
隨著按下每一個新鍵，輸入法將嘗試創建一個匹配的字符串輸入的文字至今被稱為預編輯字符串。而輸入上下文活動時，用戶可以只將光標移動屬于該輸入上下文內的字符串。
3. **Completing**
在一些點，用戶將激活一個用戶接口部件（可能使用特定的鍵），其中它們可以從許多匹配他們已經輸入到目前為止文本字符串的選擇。用戶可以確認他們的選擇取消輸入，在這兩種情況下的輸入上下文將被關閉。
QInputMethodEvent模型這三個階段，并轉移到正確渲染中間結果所需的信息。一個QInputMethodEvent有兩個主要參數：[preeditString](qinputmethodevent.html#preeditString)（）和[commitString](qinputmethodevent.html#commitString)（ ） 。該[preeditString](qinputmethodevent.html#preeditString)（ ）參數提供了當前活動的預編輯字符串。該[commitString](qinputmethodevent.html#commitString)（）的參數給出了應該被添加到（或更換的零件）的編輯控件的文本的文本。它通常是輸入操作的結果，并具有直接的預編輯字符串之前，要被插入到該小部件文本。
如果[commitString](qinputmethodevent.html#commitString)（ ）應該更換的編輯器中的文字部分，[replacementLength](qinputmethodevent.html#replacementLength)（）將包含要被替換的字符數。[replacementStart](qinputmethodevent.html#replacementStart)（）包含在該字符將相對從預編輯字符串的開始取代了位置。
一些屬性控制預編輯字符串的視覺外觀（文本的視覺外觀的預編輯字符串外僅由部件控制） 。該[AttributeType](qinputmethodevent.html#AttributeType-enum)枚舉描述了可設置不同的屬性。
一個類實現[QWidget.inputMethodEvent](qwidget.html#inputMethodEvent)（）或[QGraphicsItem.inputMethodEvent](qgraphicsitem.html#inputMethodEvent)（ ）至少應該理解和尊敬[TextFormat](qinputmethodevent.html#AttributeType-enum)和[Cursor](qinputmethodevent.html#AttributeType-enum)屬性。
因為輸入方法需要能夠從部件或圖形項查詢某些屬性，子類還必須實現[QWidget.inputMethodQuery](qwidget.html#inputMethodQuery)（）和[QGraphicsItem.inputMethodQuery](qgraphicsitem.html#inputMethodQuery)（） ，分別為。
當接收到一個輸入法事件，文本組件必須執行以下步驟：
1. 如果控件已選定的文本，選定文本應該得到消除。
2. 刪除文本的起始處[replacementStart](qinputmethodevent.html#replacementStart)（ ）與長度[replacementLength](qinputmethodevent.html#replacementLength)（）和由它代替[commitString](qinputmethodevent.html#commitString)（ ） 。如果[replacementLength](qinputmethodevent.html#replacementLength)（ ）為0，[replacementStart](qinputmethodevent.html#replacementStart)（）給出的插入位置[commitString](qinputmethodevent.html#commitString)（ ） 。
當進行置換預先編輯字符串的區域將被忽略，從而替代從-1開始為2的長度將預編輯字符串，之后的第一個字符之前刪除的最后一個字符，并直接將預編輯字符串前插入提交字符串。
如果小部件工具撤消/重做，這種操作被添加到撤消堆棧中。
3. 如果沒有當前預編輯字符串，插入[preeditString](qinputmethodevent.html#preeditString)（ ）在當前光標位置，否則與此事件收到一個取代以前preeditString 。
如果小部件工具撤消/重做時，[preeditString](qinputmethodevent.html#preeditString)（ ）不應該影響撤消/重做棧以任何方式。
窗口小部件應檢查屬性列表應用到預編輯字符串。它具有至少了解的[TextFormat](qinputmethodevent.html#AttributeType-enum)和游標屬性和指定渲染它們。
* * *
## Type Documentation
```
QInputMethodEvent.AttributeType
```
| Constant | Value | Description |
| --- | --- | --- |
| `QInputMethodEvent.TextFormat` | `0` | A [QTextCharFormat](qtextcharformat.html)對預編輯字符串由start和length指定的一部分。值包含一個[QVariant](qvariant.html)類型[QTextFormat](qtextformat.html)指定這部分的預編輯字符串的渲染。應該有至多有一個格式的預編輯字符串的每一個部分。如果幾個是在字符串中指定的任何字符的行為是未定義的。一個符合標準的實現必須至少兌現格式的backgroundColor ，文字顏色及加底線的屬性。 |
| `QInputMethodEvent.Cursor` | `1` | 如果設置，光標應顯示預編輯字符串內的位置開始。長度變量確定光標是否可見或不可見。如果長度為0的光標是不可見的。如果值是一個[QVariant](qvariant.html)類型[QColor](qcolor.html)這種顏色將用于渲染光標，否則周圍文本的顏色將被使用。應該有每個事件最多只有一個光標屬性。如果幾個指定的行為是未定義的。 |
| `QInputMethodEvent.Language` | `2` | 變體包含一個[QLocale](qlocale.html)對象指定預編輯字符串的某一部分的語言。應該有至多有一個語言的預編輯字符串的每一個部分設置。如果幾個是在字符串中指定的任何字符的行為是未定義的。 |
| `QInputMethodEvent.Ruby` | `3` | 紅寶石文本預編輯字符串的一部分。應該有對預編輯字符串的每一個部分最多有一個紅寶石的文本集。如果幾個是在字符串中指定的任何字符的行為是未定義的。 |
| `QInputMethodEvent.Selection` | `4` | 如果設置，編輯光標應該被移動到編輯器中的文本內容中的指定位置。與此相反`Cursor`，這個屬性不能在預先編輯文字工作，但對周圍的文字。光標將后移至提交字符串一直致力于，并預先編輯字符串將設在新的編輯位置。的開始位置指定新的位置和長度可變，可用于設置從該點起進行選擇。該值是未使用的。 |
**See also** [Attribute](index.htm)。
* * *
## Method Documentation
```
QInputMethodEvent.__init__ (self)
```
構造類型的事件[QEvent.InputMethod](qevent.html#Type-enum)。該[attributes](qinputmethodevent.html#attributes)（ ）[preeditString](qinputmethodevent.html#preeditString)（ ）[commitString](qinputmethodevent.html#commitString)（ ）[replacementStart](qinputmethodevent.html#replacementStart)（）和[replacementLength](qinputmethodevent.html#replacementLength)（ ）被初始化為默認值。
**See also** [setCommitString](qinputmethodevent.html#setCommitString)（ ） 。
```
QInputMethodEvent.__init__ (self, QString?preeditText, list-of-QInputMethodEvent.Attribute?attributes)
```
Construcs類型的事件[QEvent.InputMethod](qevent.html#Type-enum)。預編輯文本設置為_preeditText_的屬性_attributes_。
該[commitString](qinputmethodevent.html#commitString)（ ）[replacementStart](qinputmethodevent.html#replacementStart)（）和[replacementLength](qinputmethodevent.html#replacementLength)（）值可以使用設置[setCommitString](qinputmethodevent.html#setCommitString)（ ） 。
**See also** [preeditString](qinputmethodevent.html#preeditString)（）和[attributes](qinputmethodevent.html#attributes)（ ） 。
```
QInputMethodEvent.__init__ (self, QInputMethodEvent?other)
```
構造的副本_other_。
```
list-of-QInputMethodEvent.Attribute QInputMethodEvent.attributes (self)
```
返回傳遞到屬性列表[QInputMethodEvent](qinputmethodevent.html)構造函數。的屬性控制在預編輯字符串的視覺外觀（文字的視覺外觀的預編輯字符串以外僅由部件控制）。
**See also** [preeditString](qinputmethodevent.html#preeditString)（）和[Attribute](index.htm)。
```
QString QInputMethodEvent.commitString (self)
```
返回應該被添加到（或更換的零件）的編輯控件的文本。它通常是輸入操作的結果，并具有直接的預編輯字符串之前，要被插入到該小部件文本。
**See also** [setCommitString](qinputmethodevent.html#setCommitString)（ ）[preeditString](qinputmethodevent.html#preeditString)（ ）[replacementStart](qinputmethodevent.html#replacementStart)（）和[replacementLength](qinputmethodevent.html#replacementLength)（ ） 。
```
QString QInputMethodEvent.preeditString (self)
```
返回預編輯文本，即文本的用戶開始編輯它。
**See also** [commitString](qinputmethodevent.html#commitString)（）和[attributes](qinputmethodevent.html#attributes)（ ） 。
```
int QInputMethodEvent.replacementLength (self)
```
返回被替換的預編輯字符串中的字符數。
**See also** [replacementStart](qinputmethodevent.html#replacementStart)（）和[setCommitString](qinputmethodevent.html#setCommitString)（ ） 。
```
int QInputMethodEvent.replacementStart (self)
```
返回字符將被相對的預編輯字符串的開始取代了位置。
**See also** [replacementLength](qinputmethodevent.html#replacementLength)（）和[setCommitString](qinputmethodevent.html#setCommitString)（ ） 。
```
QInputMethodEvent.setCommitString (self, QString?commitString, int?from?=?0, int?length?=?0)
```
提交字符串設置為_commitString_。
提交的字符串是一個應該被添加到（或更換的零件）的編輯控件的文本。它通常是輸入操作的結果，并具有直接的預編輯字符串之前，要被插入到該小部件文本。
如果提交的字符串應該替換的編輯器中的文字部分，_replaceLength_指定要被替換的字符數。_replaceFrom_指定在哪個字符被從相對的預編輯字符串的開始取代了位置。
**See also** [commitString](qinputmethodevent.html#commitString)（ ）[replacementStart](qinputmethodevent.html#replacementStart)（）和[replacementLength](qinputmethodevent.html#replacementLength)（ ） 。
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- QPyDesignerCustomWidgetPlugin Class Reference
- QPyDesignerMemberSheetExtension Class Reference
- QPyDesignerPropertySheetExtension Class Reference
- QPyDesignerTaskMenuExtension Class Reference
- QPyNullVariant Class Reference
- QPyTextObject Class Reference
- QQuaternion Class Reference
- QRadialGradient Class Reference
- QRadioButton Class Reference
- QRawFont Class Reference
- QReadLocker Class Reference
- QReadWriteLock Class Reference
- QRect Class Reference
- QRectF Class Reference
- QRegExp Class Reference
- QRegExpValidator Class Reference
- QRegion Class Reference
- QResizeEvent Class Reference
- QResource Class Reference
- QRubberBand Class Reference
- QRunnable Class Reference
- QScriptClass Class Reference
- 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文檔翻譯：Qt樣式單參考,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