[PATCH]Mouse-over effects don't work properly in QToolBox
REGAT-BARREL Aurelien
arbvtk at yahoo.fr
Fri Dec 17 01:34:24 CET 2004
Hi,
I spent lots of time tracing execution with the debuger, and I didn't find a place in *win.cpp code which seems to be responsible. The point of my interest is now qbutton.cpp, in paintEvent function (line 880) :
/*!
Handles paint events for buttons. Small and typically complex
buttons are painted double-buffered to reduce flicker. The
actually drawing is done in the virtual functions drawButton() and
drawButtonLabel().
\sa drawButton(), drawButtonLabel()
*/
void QButton::paintEvent( QPaintEvent *)
{
#ifdef Q_WS_WIN
QPainter p( this );
drawButton (&p);
#else
QSharedDoubleBuffer buffer( this );
drawButton( buffer.painter() );
#endif
}
I tried to change the #ifdef in order to use the double buffering as the comments suggest, and... it works! In fact, clearing the QPainter is missing, the following code works too:
#ifdef Q_WS_WIN
QPainter p( this );
p.eraseRect( this->rect() ); <- added
drawButton (&p);
#else
So I looked in qbutton.cpp from qt-x11-free-3.3.3 and found this:
void QButton::paintEvent( QPaintEvent *)
{
QSharedDoubleBuffer buffer( this );
drawButton( buffer.painter() );
}
So I am wondering where does this #ifdef Q_WS_WIN comes from ? What do you think about using the double buffer which is what is used in last Qt X11 release ?
Regards.
Aurelien REGAT-BARREL
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