void QgsLayoutItemScaleBar::resizeToMinimumWidth()
{
if ( !mStyle )
return;
double widthMM = mStyle->calculateBoxSize( mSettings, createScaleContext() ).width();
QgsLayoutSize currentSize = sizeWithUnits();
currentSize.setWidth( mLayout->renderContext().measurementConverter().convert( QgsLayoutMeasurement( widthMM, QgsUnitTypes::LayoutMillimeters ), currentSize.units() ).length() );
attemptResize( currentSize );
update();
emit changed();
}
void QgsLayoutItemLegend::adjustBoxSize()
{
if ( !mSizeToContents )
return;
if ( !mInitialMapScaleCalculated )
{
// this is messy - but until we have painted the item we have no knowledge of the current DPI
// and so cannot correctly calculate the map scale. This results in incorrect size calculations
// for marker symbols with size in map units, causing the legends to initially expand to huge
// sizes if we attempt to calculate the box size first.
return;
}
QgsLegendRenderer legendRenderer( mLegendModel.get(), mSettings );
QSizeF size = legendRenderer.minimumSize();
QgsDebugMsg( QStringLiteral( "width = %1 height = %2" ).arg( size.width() ).arg( size.height() ) );
if ( size.isValid() )
{
QgsLayoutSize newSize = mLayout->convertFromLayoutUnits( size, sizeWithUnits().units() );
//set new rect, respecting position mode and data defined size/position
attemptResize( newSize );
}
}
void QgsLayoutItemLegend::paint( QPainter *painter, const QStyleOptionGraphicsItem *itemStyle, QWidget *pWidget )
{
if ( !painter )
return;
if ( mFilterAskedForUpdate )
{
mFilterAskedForUpdate = false;
doUpdateFilterByMap();
}
int dpi = painter->device()->logicalDpiX();
double dotsPerMM = dpi / 25.4;
if ( mLayout )
{
mSettings.setUseAdvancedEffects( mLayout->renderContext().flags() & QgsLayoutRenderContext::FlagUseAdvancedEffects );
mSettings.setDpi( dpi );
}
if ( mMap && mLayout )
{
mSettings.setMmPerMapUnit( mLayout->convertFromLayoutUnits( mMap->mapUnitsToLayoutUnits(), QgsUnitTypes::LayoutMillimeters ).length() );
// use a temporary QgsMapSettings to find out real map scale
QSizeF mapSizePixels = QSizeF( mMap->rect().width() * dotsPerMM, mMap->rect().height() * dotsPerMM );
QgsRectangle mapExtent = mMap->extent();
QgsMapSettings ms = mMap->mapSettings( mapExtent, mapSizePixels, dpi, false );
mSettings.setMapScale( ms.scale() );
}
mInitialMapScaleCalculated = true;
QgsLegendRenderer legendRenderer( mLegendModel.get(), mSettings );
legendRenderer.setLegendSize( mForceResize && mSizeToContents ? QSize() : rect().size() );
//adjust box if width or height is too small
if ( mSizeToContents )
{
QSizeF size = legendRenderer.minimumSize();
if ( mForceResize )
{
mForceResize = false;
//set new rect, respecting position mode and data defined size/position
QgsLayoutSize newSize = mLayout->convertFromLayoutUnits( size, sizeWithUnits().units() );
attemptResize( newSize );
}
else if ( size.height() > rect().height() || size.width() > rect().width() )
{
//need to resize box
QSizeF targetSize = rect().size();
if ( size.height() > targetSize.height() )
targetSize.setHeight( size.height() );
if ( size.width() > targetSize.width() )
targetSize.setWidth( size.width() );
QgsLayoutSize newSize = mLayout->convertFromLayoutUnits( targetSize, sizeWithUnits().units() );
//set new rect, respecting position mode and data defined size/position
attemptResize( newSize );
}
}
QgsLayoutItem::paint( painter, itemStyle, pWidget );
}
