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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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<DIV>Hi,</DIV>
<DIV>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)&nbsp;:</DIV>
<DIV>/*!<BR>&nbsp;&nbsp;&nbsp; Handles paint events for buttons. Small and typically complex<BR>&nbsp;&nbsp;&nbsp; buttons are painted double-buffered to reduce flicker. The<BR>&nbsp;&nbsp;&nbsp; actually drawing is done in the virtual functions drawButton() and<BR>&nbsp;&nbsp;&nbsp; drawButtonLabel().</DIV>
<DIV>&nbsp;&nbsp;&nbsp; \sa drawButton(), drawButtonLabel()<BR>*/<BR>void QButton::paintEvent( QPaintEvent *)<BR>{<BR>#ifdef Q_WS_WIN<BR>&nbsp;&nbsp;&nbsp; QPainter p( this );<BR>&nbsp;&nbsp;&nbsp; drawButton (&amp;p);<BR>#else<BR>&nbsp;&nbsp;&nbsp; QSharedDoubleBuffer buffer( this );<BR>&nbsp;&nbsp;&nbsp; drawButton( buffer.painter() );<BR>#endif <BR>}</DIV>
<DIV>&nbsp;</DIV>
<DIV>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:</DIV>
<DIV>&nbsp;</DIV>
<DIV>#ifdef Q_WS_WIN<BR>&nbsp;&nbsp;&nbsp; QPainter p( this );<BR>&nbsp;&nbsp;&nbsp; p.eraseRect( this-&gt;rect() );&nbsp;&nbsp;&nbsp; &lt;- added<BR>&nbsp;&nbsp;&nbsp; drawButton (&amp;p);<BR>#else<BR></DIV>
<DIV>So I looked in qbutton.cpp from qt-x11-free-3.3.3 and found this:</DIV>
<DIV>&nbsp;</DIV>
<DIV>void QButton::paintEvent( QPaintEvent *)<BR>{<BR>&nbsp;&nbsp;&nbsp; QSharedDoubleBuffer buffer( this );<BR>&nbsp;&nbsp;&nbsp; drawButton( buffer.painter() );<BR>}<BR></DIV>
<DIV>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 ?</DIV>
<DIV>&nbsp;</DIV>
<DIV>Regards.</DIV><BR><BR><DIV>
<DIV>
<DIV>Aurelien REGAT-BARREL <BR></DIV></DIV></DIV><p>
		<hr size=1> 
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