内容

• 特性
• 公共函数
• 信号
• 保护函数
• 重实现保护函数
• 详细描述
• 子类化

QAbstractState 类

The QAbstractState class is the base class of states of a QStateMachine . 更多...

头：	#include <QAbstractState>
qmake:	QT += core
Since:	Qt 4.6
继承：	QObject
继承者：	QFinalState , QHistoryState ，和 QState

• 所有成员列表，包括继承成员

特性

• active : const bool

• 1 特性继承自 QObject

公共函数

	~QAbstractState ()
bool	active () const
QStateMachine *	machine () const
QState *	parentState () const

• 32 公共函数继承自 QObject

信号

void	activeChanged (bool active )
void	entered ()
void	exited ()

• 2 信号继承自 QObject

保护函数

	QAbstractState (QState * parent = Q_NULLPTR)
virtual void	onEntry (QEvent * event ) = 0
virtual void	onExit (QEvent * event ) = 0

重实现保护函数

virtual bool

event (QEvent * e )

• 9 保护函数继承自 QObject

额外继承成员

• 1 公共槽继承自 QObject
• 11 静态公共成员继承自 QObject

详细描述

The QAbstractState class is the base class of states of a QStateMachine .

The QAbstractState class is the abstract base class of states that are part of a QStateMachine . It defines the interface that all state objects have in common. QAbstractState 属于 状态机框架 .

The entered () signal is emitted when the state has been entered. The exited () signal is emitted when the state has been exited.

The parentState () function returns the state's parent state. The machine () function returns the state machine that the state is part of.

子类化

The onEntry () function is called when the state is entered; reimplement this function to perform custom processing when the state is entered.

The onExit () function is called when the state is exited; reimplement this function to perform custom processing when the state is exited.

特性文档编制

active : const bool

This property holds the active property of this state. A state is active between entered () 和 exited () 信号。

该特性在 Qt 5.4 引入。

访问函数：

bool	active () const

通知程序信号：

void	activeChanged (bool active )

成员函数文档编制

[protected] QAbstractState:: QAbstractState ( QState * parent = Q_NULLPTR)

构造新的状态采用给定 parent 状态。

QAbstractState:: ~QAbstractState ()

销毁此状态。

bool QAbstractState:: active () const

Returns whether this state is active.

注意： Getter 函数对于特性 active .

另请参阅 activeChanged (bool), entered ()，和 exited ().

[signal] void QAbstractState:: activeChanged ( bool active )

This signal is emitted when the active property is changed with active 作为自变量。

该函数在 Qt 5.4 引入。

注意： 通知程序信号对于特性 active .

另请参阅 QAbstractState::active , entered ()，和 exited ().

[signal] void QAbstractState:: entered ()

This signal is emitted when the state has been entered (after onEntry () has been called).

注意： 这是私有信号。它可以用于信号连接，但不能由用户发射。

[virtual protected] bool QAbstractState:: event ( QEvent * e )

重实现自 QObject::event ().

[signal] void QAbstractState:: exited ()

This signal is emitted when the state has been exited (after onExit () has been called).

注意： 这是私有信号。它可以用于信号连接，但不能由用户发射。

QStateMachine *QAbstractState:: machine () const

Returns the state machine that this state is part of, or 0 if the state is not part of a state machine.

[pure virtual protected] void QAbstractState:: onEntry ( QEvent * event )

This function is called when the state is entered. The given event is what caused the state to be entered. Reimplement this function to perform custom processing when the state is entered.

[pure virtual protected] void QAbstractState:: onExit ( QEvent * event )

This function is called when the state is exited. The given event is what caused the state to be exited. Reimplement this function to perform custom processing when the state is exited.

QState *QAbstractState:: parentState () const

Returns this state's parent state, or 0 if the state has no parent state.