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fixed preview event painting, to use pixmap as intermediate painting device, in order to proper account for event clip rect, and avoid decorations appearing out of the widget rect

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svn path=/trunk/KDE/kdebase/workspace/; revision=1018742
This commit is contained in:
Hugo Pereira Da Costa 2009-09-02 05:28:38 +00:00
parent b0769ebdb8
commit 76104a522a
1 changed files with 16 additions and 12 deletions
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28
kcmkwin/kwindecoration/preview.cpp
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@ -109,19 +109,23 @@ void KDecorationPreview::disablePreview()
void KDecorationPreview::paintEvent( QPaintEvent* e )
{
QWidget::paintEvent(e);
// render existing decorations into a pixmap
// there is some translations involved to make use of event.rect()
// and optimize painting
QRect rect( KDecorationPreview::rect().intersected( e->rect() ) );
QPixmap pixmap( rect.size() );
pixmap.fill( Qt::transparent );
if( deco[Inactive] ) deco[Inactive]->widget()->render( &pixmap, deco[Inactive]->widget()->mapToParent( -rect.topLeft() ) );
if( deco[Active] ) deco[Active]->widget()->render( &pixmap, deco[Active]->widget()->mapToParent( -rect.topLeft() ) );
// draw pixmap on widget
QPainter painter( this );
QPoint delta = mapTo( window(), QPoint(0, 0) );
if ( deco[Inactive] )
{
QWidget *w = deco[Inactive]->widget();
w->render( &painter, delta + w->mapToParent( QPoint(0, 0) ) );
}
if ( deco[Active] )
{
QWidget *w = deco[Active]->widget();
w->render( &painter, delta + w->mapToParent( QPoint(0, 0) ) );
}
painter.setClipRect( e->rect() );
painter.drawPixmap( rect.topLeft(), pixmap );
}
void KDecorationPreview::resizeEvent( QResizeEvent* e )