//! Update the cached informations about the current style sheet
void QwtPlotCanvas::updateStyleSheetInfo()
{
if ( !testAttribute(Qt::WA_StyledBackground ) )
return;
QwtStyleSheetRecorder recorder( size() );
QPainter painter( &recorder );
QStyleOption opt;
opt.initFrom(this);
style()->drawPrimitive( QStyle::PE_Widget, &opt, &painter, this);
painter.end();
d_data->styleSheet.hasBorder = !recorder.border.rectList.isEmpty();
d_data->styleSheet.cornerRects = recorder.clipRects;
if ( recorder.background.path.isEmpty() )
{
if ( !recorder.border.rectList.isEmpty() )
{
d_data->styleSheet.borderPath =
qwtCombinePathList( rect(), recorder.border.pathList );
}
}
else
{
d_data->styleSheet.borderPath = recorder.background.path;
d_data->styleSheet.background.brush = recorder.background.brush;
d_data->styleSheet.background.origin = recorder.background.origin;
}
}
/*!
Calculate the painter path for a styled or rounded border
When the canvas has no styled background or rounded borders
the painter path is empty.
\param rect Bounding rectangle of the canvas
\return Painter path, that can be used for clipping
*/
QPainterPath QwtPlotCanvas::borderPath( const QRect &rect ) const
{
if ( testAttribute(Qt::WA_StyledBackground ) )
{
QwtStyleSheetRecorder recorder( rect.size() );
QPainter painter( &recorder );
QStyleOption opt;
opt.initFrom(this);
opt.rect = rect;
style()->drawPrimitive( QStyle::PE_Widget, &opt, &painter, this);
painter.end();
if ( !recorder.background.path.isEmpty() )
return recorder.background.path;
if ( !recorder.border.rectList.isEmpty() )
return qwtCombinePathList( rect, recorder.border.pathList );
}
else if ( d_data->borderRadius > 0.0 )
{
double fw2 = frameWidth() * 0.5;
QRectF r = QRectF(rect).adjusted( fw2, fw2, -fw2, -fw2 );
QPainterPath path;
path.addRoundedRect( r, d_data->borderRadius, d_data->borderRadius );
return path;
}
return QPainterPath();
}
static QPainterPath qwtBorderPath( const QWidget *canvas, const QRect &rect )
{
if ( canvas->testAttribute(Qt::WA_StyledBackground ) )
{
QwtStyleSheetRecorder recorder( rect.size() );
QPainter painter( &recorder );
QStyleOption opt;
opt.initFrom( canvas );
opt.rect = rect;
canvas->style()->drawPrimitive( QStyle::PE_Widget, &opt, &painter, canvas );
painter.end();
if ( !recorder.background.path.isEmpty() )
return recorder.background.path;
if ( !recorder.border.rectList.isEmpty() )
return qwtCombinePathList( rect, recorder.border.pathList );
}
else
{
const double borderRadius = canvas->property( "borderRadius" ).toDouble();
if ( borderRadius > 0.0 )
{
double fw2 = canvas->property( "frameWidth" ).toInt() * 0.5;
QRectF r = QRectF(rect).adjusted( fw2, fw2, -fw2, -fw2 );
QPainterPath path;
path.addRoundedRect( r, borderRadius, borderRadius );
return path;
}
}
return QPainterPath();
}
