内容

特性
公共函数
重实现保护函数
详细描述

QSignalTransition 类

The QSignalTransition 类提供基于 Qt 信号的过渡。更多...

头：	#include <QSignalTransition>
Since:	Qt 4.6
继承：	QAbstractTransition

所有成员列表，包括继承成员

特性

senderObject : QObject *
signal : QByteArray

3 特性继承自 QAbstractTransition
1 特性继承自 QObject

公共函数

	QSignalTransition (QState * sourceState = 0)
	QSignalTransition (QObject * sender , const char * signal , QState * sourceState = 0)
	~QSignalTransition ()
QObject *	senderObject () const
void	setSenderObject (QObject * sender )
void	setSignal (const QByteArray & signal )
QByteArray	signal () const

9 公共函数继承自 QAbstractTransition
29 公共函数继承自 QObject

重实现保护函数

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

3 保护函数继承自 QAbstractTransition
8 保护函数继承自 QObject

额外继承成员

1 公共槽继承自 QObject
1 信号继承自 QAbstractTransition
1 信号继承自 QObject
7 静态公共成员继承自 QObject
3 保护函数继承自 QAbstractTransition
8 保护函数继承自 QObject

详细描述

The QSignalTransition 类提供基于 Qt 信号的过渡。

通常，将使用重载 QState::addTransition () 接受发送器和信号作为自变量，而不是创建 QSignalTransition 对象直接。 QSignalTransition 属于状态机框架 .

可以子类化 QSignalTransition 并重实现 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 (QObject * sender )

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 )

成员函数文档编制

QSignalTransition:: QSignalTransition ( QState * sourceState = 0)

构造新的信号过渡采用给定 sourceState .

QSignalTransition:: QSignalTransition ( QObject * sender , const char * signal , QState * sourceState = 0)

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

QSignalTransition:: ~QSignalTransition ()

销毁此信号过渡。

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

重实现自 QObject::event ().

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

重实现自 QAbstractTransition::eventTest ().

The default implementation returns true if the event 是 QStateMachine::SignalEvent object and the event's sender and signal index match this transition, and returns false otherwise.

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

重实现自 QAbstractTransition::onTransition ().

内容