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The following class members are part of the Qt 3 compatibility layer. They are provided to help you port old code to Qt 4. We strongly advise against using them in new code.
QCoreApplication class reference
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().
This function does nothing. It is there to keep old code working. It always returns false.
See lock() for details.
This function does nothing. It is there to keep old code working. It always returns false.
See lock() for details.
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.
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