The following class members are part of the Qt 3 support layer. They are provided to help you port old code to Qt 4. We advise against using them in new code.
| QPaintEvent ( const QRegion & paintRegion, const QRect & paintRect ) | |
| bool | erased () const |
Constructs a paint event object with both a paintRegion and a paintRect, both of which represent the area of the widget that needs to be updated.
Returns true if the paint event region (or rectangle) has been erased with the widget's background; otherwise returns false.
Qt 4 always erases regions that require painting. The exception to this rule is if the widget sets the Qt::WA_OpaquePaintEvent or Qt::WA_NoSystemBackground attributes. If either one of those attributes is set and the window system does not make use of subwidget alpha composition (currently X11 and Windows, but this may change), then the region is not erased.
© 2008-2011 Nokia Corporation and/or its subsidiaries. Nokia, Qt and their respective logos are trademarks of Nokia Corporation in Finland and/or other countries worldwide.
All other trademarks are property of their respective owners. Privacy Policy
Licensees holding valid Qt Commercial licenses may use this document in accordance with the Qt Commercial License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Nokia.
Alternatively, this document may be used under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.