Compatibility Members for QCoreApplication

The following members of class QCoreApplicationare part of the Qt compatibility layer. We advise against using them in new code.

Public Functions

• 8 public functions inherited from QObject

Member Function Documentation

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.

See also QWidget::paintEvent().

bool QCoreApplication::locked()

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

See lock() for details.

bool QCoreApplication::tryLock()

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

See lock() for details.

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.