內容

• 公共函數
• 詳細描述

QSignalBlocker 類

異常安全包裹器圍繞 QObject::blockSignals () 更多...

頭：	#include <QSignalBlocker>
qmake:	QT += core
Since:	Qt 5.3

• 所有成員列錶，包括繼承成員

注意： 此類的所有函數 可重入 .

公共函數

	QSignalBlocker (QObject * object )
	QSignalBlocker (QObject & object )
	QSignalBlocker (QSignalBlocker && other )
	~QSignalBlocker ()
void	reblock ()
void	unblock ()
QSignalBlocker &	operator= (QSignalBlocker && other )

詳細描述

異常安全包裹器圍繞 QObject::blockSignals ()

QSignalBlocker can be used whereever you would otherwise use a pair of calls to blockSignals(). It blocks signals in its constructor and in the destructor it resets the state to what it was before the constructor ran.

{
const QSignalBlocker blocker(someQObject);
// no signals here
}
					

因此相當於

const bool wasBlocked = someQObject->blockSignals(true);
// no signals here
someQObject->blockSignals(wasBlocked);
					

除瞭代碼使用 QSignalBlocker 在異常麵前是安全的。

另請參閱 QMutexLocker and QEventLoopLocker .

成員函數文檔編製

QSignalBlocker:: QSignalBlocker ( QObject * object )

構造函數。調用 object ->blockSignals(true).

QSignalBlocker:: QSignalBlocker ( QObject & object )

這是重載函數。

調用 object .blockSignals(true).

QSignalBlocker:: QSignalBlocker ( QSignalBlocker && other )

移動構造信號阻塞器自 other . other will have a no-op destructor, while repsonsibility for restoring the QObject::signalsBlocked () state is transferred to the new object.

QSignalBlocker:: ~QSignalBlocker ()

析構函數。還原 QObject::signalsBlocked () state to what it was before the constructor ran, unless unblock () has been called without a following reblock (), in which case it does nothing.

void QSignalBlocker:: reblock ()

重新阻塞之後信號，基於先前 unblock ().

The numbers of reblock() and unblock () calls are not counted, so every reblock() undoes any number of unblock () 調用。

void QSignalBlocker:: unblock ()

Temporarily restores the QObject::signalsBlocked () state to what it was before this QSignaBlocker's constructor ran. To undo, use reblock ().

The numbers of reblock () and unblock() calls are not counted, so every unblock() undoes any number of reblock () 調用。

QSignalBlocker &QSignalBlocker:: operator= ( QSignalBlocker && other )

Move-assigns this signal blocker from other . other will have a no-op destructor, while repsonsibility for restoring the QObject::signalsBlocked () state is transferred to this object.

The object's signals this signal blocker was blocking prior to being moved to, if any, are unblocked except in the case where both instances block the same object's signals and *this is unblocked while other is not, at the time of the move.