There is also hardcoded margin. Here is better code (added margin and
removed stupid check):
else if ( !d->mouseGrabPos.isNull() )
{
setCursor( Qt::SizeAllCursor );
QPoint mousePos = e->globalPos();
QPoint delta = d->mouseGrabPos - mousePos;
const QRect mouseContainer =
KGlobalSettings::desktopGeometry( this );
static const int margin = 5;
// wrap mouse from top to bottom
if ( mousePos.y() < mouseContainer.top() + margin &&
verticalScrollBar()->value() <
verticalScrollBar()->maximum() - 2*margin )
{
mousePos.setY( mouseContainer.bottom() - margin );
QCursor::setPos( mousePos );
}
// wrap mouse from bottom to top
else if ( mousePos.y() > mouseContainer.bottom() - margin &&
verticalScrollBar()->value() > 2*margin )
{
mousePos.setY( mouseContainer.top() + margin );
QCursor::setPos( mousePos );
}
// remember last position
d->mouseGrabPos = mousePos;
// scroll page by position increment
horizontalScrollBar()->setValue(horizontalScrollBar()->value() +
delta.x());
verticalScrollBar()->setValue(verticalScrollBar()->value() +
delta.y());
}
}
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