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  5. QSignalTransition

QSignalTransition 类

The QSignalTransition class provides a transition based on a Qt signal. 更多...

头： #include <QSignalTransition>
qmake: QT += core
Since: Qt 4.6
继承： QAbstractTransition

该类在 Qt 4.6 引入。

特性

公共函数

QSignalTransition (const QObject * sender , PointerToMemberFunction signal , QState * sourceState = nullptr)
QSignalTransition (const QObject * sender , const char * signal , QState * sourceState = nullptr)
QSignalTransition (QState * sourceState = nullptr)
virtual ~QSignalTransition ()
QObject * senderObject () const
void setSenderObject (const QObject * sender )
void setSignal (const QByteArray & signal )
QByteArray signal () const

信号

void senderObjectChanged ()
void signalChanged ()

重实现保护函数

virtual bool event (QEvent * e ) override
virtual bool eventTest (QEvent * event ) override
virtual void onTransition (QEvent * event ) override

详细描述

通常，将使用重载 QState::addTransition () that takes a sender and signal as arguments, rather than creating QSignalTransition objects directly. QSignalTransition is part of 状态机框架 .

You can subclass QSignalTransition and reimplement eventTest () to make a signal transition conditional; the event object passed to eventTest () 将是 QStateMachine::SignalEvent object. Example: 

class CheckedTransition : public QSignalTransition
{
public:
    CheckedTransition(QCheckBox *check)
        : QSignalTransition(check, SIGNAL(stateChanged(int))) {}
protected:
    bool eventTest(QEvent *e) {
        if (!QSignalTransition::eventTest(e))
            return false;
        QStateMachine::SignalEvent *se = static_cast<QStateMachine::SignalEvent*>(e);
        return (se->arguments().at(0).toInt() == Qt::Checked);
    }
};
...
QCheckBox *check = new QCheckBox();
check->setTristate(true);
QState *s1 = new QState();
QState *s2 = new QState();
CheckedTransition *t1 = new CheckedTransition(check);
t1->setTargetState(s2);
s1->addTransition(t1);

特性文档编制

senderObject : QObject *

This property holds the sender object that this signal transition is associated with

访问函数：

QObject * senderObject () const
void setSenderObject (const QObject * sender )

通知程序信号：

void senderObjectChanged () [见下文注意事项]

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。

signal : QByteArray

This property holds the signal that this signal transition is associated with

访问函数：

QByteArray signal () const
void setSignal (const QByteArray & signal )

通知程序信号：

void signalChanged () [见下文注意事项]

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。

成员函数文档编制

template <typename PointerToMemberFunction> QSignalTransition:: QSignalTransition (const QObject * sender , PointerToMemberFunction signal , QState * sourceState = nullptr)

这是重载函数。

Constructs a new signal transition associated with the given signal 为给定 sender object and with the given sourceState . This constructor is enabled if the compiler supports delegating constructors, as indicated by the presence of the macro Q_COMPILER_DELEGATING_CONSTRUCTORS.

该函数在 Qt 5.7 引入。

QSignalTransition:: QSignalTransition (const QObject * sender , const char * signal , QState * sourceState = nullptr)

Constructs a new signal transition associated with the given signal 为给定 sender ，和采用给定 sourceState .

QSignalTransition:: QSignalTransition ( QState * sourceState = nullptr)

构造新的信号过渡采用给定 sourceState .

[signal] void QSignalTransition:: senderObjectChanged ()

此信号发射当 senderObject 特性改变。

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。

注意： 通知程序信号对于特性 senderObject .

该函数在 Qt 5.4 引入。

另请参阅 QSignalTransition::senderObject .

[signal] void QSignalTransition:: signalChanged ()

此信号被发射，当信号特性改变时。

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。

注意： 通知程序信号对于特性 signal .

该函数在 Qt 5.4 引入。

另请参阅 QSignalTransition::signal .

[虚拟] QSignalTransition:: ~QSignalTransition ()

销毁此信号过渡。

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

重实现： QAbstractTransition::event (QEvent *e).

[override virtual protected] bool QSignalTransition:: eventTest ( QEvent * event )

重实现： QAbstractTransition::eventTest (QEvent *event).

默认实现返回 true 若 event 是 QStateMachine::SignalEvent object and the event's sender and signal index match this transition, and returns false 否则。

[override virtual protected] void QSignalTransition:: onTransition ( QEvent * event )

重实现： QAbstractTransition::onTransition (QEvent *event).

QObject *QSignalTransition:: senderObject () const

Returns the sender object associated with this signal transition.

注意： Getter function for property senderObject.

另请参阅 setSenderObject ().

void QSignalTransition:: setSenderObject (const QObject * sender )

设置 sender object associated with this signal transition.

注意： setter 函数对于特性 senderObject .

另请参阅 senderObject ().

void QSignalTransition:: setSignal (const QByteArray & signal )

设置 signal associated with this signal transition.

注意： setter 函数对于特性 signal .

另请参阅 signal ().

QByteArray QSignalTransition:: signal () const

Returns the signal associated with this signal transition.

注意： Getter function for property signal.

另请参阅 setSignal ().

内容