Compatibility Members for QCoreApplication

以下成员源于类 QCoreApplication are part of the Qt compatibility layer. We advise against using them in new code.

公共函数

void	lock ()
bool	locked ()
bool	tryLock ()
void	unlock (bool wakeUpGui = true)

• 8 公共函数继承自 QObject

成员函数文档编制

void QCoreApplication:: lock ()

In Qt 3, this function locked the Qt library mutex, allowing non-GUI threads to perform basic printing operations using QPainter .

In Qt 4, this is no longer supported, since painting is only supported from within a paint event handler. This function does nothing.

另请参阅 QWidget::paintEvent ().

bool QCoreApplication:: locked ()

This function does nothing. It is there to keep old code working. It always returns false.

见 lock () 了解细节。

bool QCoreApplication:: tryLock ()

This function does nothing. It is there to keep old code working. It always returns false.

见 lock () 了解细节。

void QCoreApplication:: unlock ( bool wakeUpGui = true)

In Qt 3, this function unlocked the Qt library mutex. The mutex allowed non-GUI threads to perform basic printing operations using QPainter .

In Qt 4, this is no longer supported, since painting is only supported from within a paint event handler. This function does nothing.