# QUndoCommand Class Reference
## [[QtGui](index.htm) module]
该QUndoCommand类是所有的命令存储在基类[QUndoStack](qundostack.html)。[More...](#details)
### Methods
* `__init__ (self, QUndoCommand parent = None)`
* `__init__ (self, QString text, QUndoCommand parent = None)`
* `QString actionText (self)`
* `QUndoCommand child (self, int index)`
* `int childCount (self)`
* `int id (self)`
* `bool mergeWith (self, QUndoCommand other)`
* `redo (self)`
* `setText (self, QString text)`
* `QString text (self)`
* `undo (self)`
* * *
## Detailed Description
该QUndoCommand类是所有的命令存储在基类[QUndoStack](qundostack.html)。
对于Qt的复原框架的概述，请参阅[overview document](index.htm)。
一个QUndoCommand代表文档中的单个编辑操作，例如，插入或删除一个文本编辑器文本块。 QUndoCommand可以申请更改的文件与[redo](qundocommand.html#redo)（）和撤销与变更[undo](qundocommand.html#undo)（ ） 。在实现这些功能必须在派生类中提供。
```
class AppendText : public QUndoCommand
{
public:
AppendText([QString](qstring.html) *doc, const [QString](qstring.html) &text)
: m_document(doc), m_text(text) { setText("append text"); }
virtual void undo()
{ m_document->chop(m_text.length()); }
virtual void redo()
{ m_document->append(m_text); }
private:
[QString](qstring.html) *m_document;
[QString](qstring.html) m_text;
};
```
一个QUndoCommand都有一个关联的[text](qundocommand.html#text)（ ） 。这是一个短字符串描述该命令功能。它是用来更新堆栈的撤消的文本属性和重复动作，见[QUndoStack.createUndoAction](qundostack.html#createUndoAction)（）和[QUndoStack.createRedoAction](qundostack.html#createRedoAction)（ ） 。
QUndoCommand对象由堆栈他们被压入资。[QUndoStack](qundostack.html)删除的命令，如果它已被撤消和一个新的命令被推动。例如：
```
MyCommand *command1 = new MyCommand();
stack->push(command1);
MyCommand *command2 = new MyCommand();
stack->push(command2);
stack->undo();
MyCommand *command3 = new MyCommand();
stack->push(command3); // command2 gets deleted
```
实际上，当命令被按下时，它成为堆栈上的最顶层的命令。
为了支持命令压缩， QUndoCommand有[id](qundocommand.html#id)（ ）和虚拟功能[mergeWith](qundocommand.html#mergeWith)（ ） 。这些功能所使用的[QUndoStack.push](qundostack.html#push)（ ） 。
为了支持宏命令，一个QUndoCommand对象可以有任意数量的子命令。撤消或重做父的命令会让孩子命令撤消或重做。命令可以在构造函数中显式地指定给父母。在这种情况下，该命令将被父所拥有。
在这种情况下，父通常是一个空命令，因为它不提供它自己的实现的[undo](qundocommand.html#undo)（）和[redo](qundocommand.html#redo)（ ） 。相反，它使用这些功能的基本实现，它只是简单的调用[undo](qundocommand.html#undo)（）或[redo](qundocommand.html#redo)（ ）在它的所有子项。家长应，然而，有一个有意义的[text](qundocommand.html#text)（ ） 。
```
QUndoCommand *insertRed = new QUndoCommand(); // an empty command
insertRed->setText("insert red text");
new InsertText(document, idx, text, insertRed); // becomes child of insertRed
new SetColor(document, idx, text.length(), [Qt](qt.html).red, insertRed);
stack.push(insertRed);
```
另一种方式来创建宏是使用便利的功能[QUndoStack.beginMacro](qundostack.html#beginMacro)（）和[QUndoStack.endMacro](qundostack.html#endMacro)（ ） 。
* * *
## Method Documentation
```
QUndoCommand.__init__ (self, QUndoCommand parent = None)
```
该_parent_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。
构造一个[QUndoCommand](qundocommand.html)与父对象_parent_。
If _parent_不为0 ，则该命令被添加到父节点的子列表。父命令则拥有这个命令将在其析构函数删除它。
**See also** [~QUndoCommand](qundocommand.html#dtor.QUndoCommand)（ ） 。
```
QUndoCommand.__init__ (self, QString text, QUndoCommand parent = None)
```
该_parent_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。
构造一个[QUndoCommand](qundocommand.html)与给定对象_parent_和_text_。
If _parent_不为0 ，则该命令被添加到父节点的子列表。父命令则拥有这个命令将在其析构函数删除它。
**See also** [~QUndoCommand](qundocommand.html#dtor.QUndoCommand)（ ） 。
```
QString QUndoCommand.actionText (self)
```
返回描述了这个命令做了简短的文本字符串，例如， “插入文字” 。
该文本时使用的堆栈的撤消的文本属性和重复动作被更新。
此功能被引入Qt的4.8 。
**See also** [text](qundocommand.html#text)（ ）[setText](qundocommand.html#setText)（ ）[QUndoStack.createUndoAction](qundostack.html#createUndoAction)（）和[QUndoStack.createRedoAction](qundostack.html#createRedoAction)（ ） 。
```
QUndoCommand QUndoCommand.child (self, int index)
```
[
在返回的子命令_index_。
此功能被引入Qt的4.4 。
](qundocommand.html)
[**See also**](qundocommand.html) [childCount](qundocommand.html#childCount)（）和[QUndoStack.command](qundostack.html#command)（ ） 。
```
int QUndoCommand.childCount (self)
```
返回此命令子命令的数量。
此功能被引入Qt的4.4 。
**See also** [child](qundocommand.html#child)（ ） 。
```
int QUndoCommand.id (self)
```
返回此命令的ID 。
命令ID用来在命令压缩。它必须是一个整数独此命令的类，或者-1如果命令不支持压缩。
如果命令支持压缩这个函数必须在派生类中重写以返回正确的ID 。基实现返回-1 。
[QUndoStack.push](qundostack.html#push)（）将只尝试合并两个命令，如果它们具有相同的ID，并且该ID不是-1。
**See also** [mergeWith](qundocommand.html#mergeWith)（）和[QUndoStack.push](qundostack.html#push)（ ） 。
```
bool QUndoCommand.mergeWith (self, QUndoCommand other)
```
尝试与合并这个命令_command_。成功时返回TRUE ，否则返回False 。
如果这个函数返回True，则调用此命令的[redo](qundocommand.html#redo)（ ）必须具有相同的效果，既重做这个命令和_command_。同样，调用此命令的[undo](qundocommand.html#undo)（ ）必须具有相同的效果撤消_command_与此命令。
[QUndoStack](qundostack.html)只会尝试合并两个命令，如果他们有相同的id ，而id是不是-1 。
默认实现返回False 。
```
bool AppendText.mergeWith(const [QUndoCommand](qundocommand.html) *other)
{
if (other->id() != id()) // make sure other is also an AppendText command
return false;
m_text += static_cast<const AppendText*>(other)->m_text;
return true;
}
```
**See also** [id](qundocommand.html#id)（）和[QUndoStack.push](qundostack.html#push)（ ） 。
```
QUndoCommand.redo (self)
```
适用变更的文件。这个函数必须在派生类中实现。调用[QUndoStack.push](qundostack.html#push)（ ）[QUndoStack.undo](qundostack.html#undo)（）或[QUndoStack.redo](qundostack.html#redo)从这个函数（ ）导致未定义beahavior 。
默认实现调用重做（ ）对所有的子命令。
**See also** [undo](qundocommand.html#undo)（ ） 。
```
QUndoCommand.setText (self, QString text)
```
设置为命令的文本_text_规定。
指定文本应描述了这个命令的作用很短的用户可读的字符串。
如果你需要有两个不同的字符串[text](qundocommand.html#text)（）和[actionText](qundocommand.html#actionText)（ ） ，将它们分开为“\ n ” ，并传递到这个函数。即使你在开发过程中不使用此功能的英文字符串，你仍然可以让翻译使用两个不同的字符串，以匹配特定语言的需求。所描述的特征和功能[actionText](qundocommand.html#actionText)（ ）是因为Qt的4.8可用。
**See also** [text](qundocommand.html#text)（ ）[actionText](qundocommand.html#actionText)（ ）[QUndoStack.createUndoAction](qundostack.html#createUndoAction)（）和[QUndoStack.createRedoAction](qundostack.html#createRedoAction)（ ） 。
```
QString QUndoCommand.text (self)
```
返回描述了这个命令做了简短的文本字符串，例如， “插入文字” 。
该文本是用于项目的名称[QUndoView](qundoview.html)。
**See also** [actionText](qundocommand.html#actionText)（ ）[setText](qundocommand.html#setText)（ ）[QUndoStack.createUndoAction](qundostack.html#createUndoAction)（）和[QUndoStack.createRedoAction](qundostack.html#createRedoAction)（ ） 。
```
QUndoCommand.undo (self)
```
恢复一个变化到文档中。撤消（）被调用后，文件的状态应该是和以前一样[redo](qundocommand.html#redo)（ ）被调用。这个函数必须在派生类中实现。调用[QUndoStack.push](qundostack.html#push)（ ）[QUndoStack.undo](qundostack.html#undo)（）或[QUndoStack.redo](qundostack.html#redo)从这个函数（ ）导致未定义beahavior 。
默认实现调用撤消（ ）上的所有子命令的顺序相反。
**See also** [redo](qundocommand.html#redo)（ ） 。
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- QSslKey Class Reference
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- 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