QgsFeatureRendererV2* QgsCategorizedSymbolRendererV2::create( QDomElement& element )
{
QDomElement symbolsElem = element.firstChildElement( "symbols" );
if ( symbolsElem.isNull() )
return NULL;
QDomElement catsElem = element.firstChildElement( "categories" );
if ( catsElem.isNull() )
return NULL;
QgsSymbolV2Map symbolMap = QgsSymbolLayerV2Utils::loadSymbols( symbolsElem );
QgsCategoryList cats;
QDomElement catElem = catsElem.firstChildElement();
while ( !catElem.isNull() )
{
if ( catElem.tagName() == "category" )
{
QVariant value = QVariant( catElem.attribute( "value" ) );
QString symbolName = catElem.attribute( "symbol" );
QString label = catElem.attribute( "label" );
if ( symbolMap.contains( symbolName ) )
{
QgsSymbolV2* symbol = symbolMap.take( symbolName );
cats.append( QgsRendererCategoryV2( value, symbol, label ) );
}
}
catElem = catElem.nextSiblingElement();
}
QString attrName = element.attribute( "attr" );
QgsCategorizedSymbolRendererV2* r = new QgsCategorizedSymbolRendererV2( attrName, cats );
// delete symbols if there are any more
QgsSymbolLayerV2Utils::clearSymbolMap( symbolMap );
// try to load source symbol (optional)
QDomElement sourceSymbolElem = element.firstChildElement( "source-symbol" );
if ( !sourceSymbolElem.isNull() )
{
QgsSymbolV2Map sourceSymbolMap = QgsSymbolLayerV2Utils::loadSymbols( sourceSymbolElem );
if ( sourceSymbolMap.contains( "0" ) )
{
r->setSourceSymbol( sourceSymbolMap.take( "0" ) );
}
QgsSymbolLayerV2Utils::clearSymbolMap( sourceSymbolMap );
}
// try to load color ramp (optional)
QDomElement sourceColorRampElem = element.firstChildElement( "colorramp" );
if ( !sourceColorRampElem.isNull() && sourceColorRampElem.attribute( "name" ) == "[source]" )
{
r->setSourceColorRamp( QgsSymbolLayerV2Utils::loadColorRamp( sourceColorRampElem ) );
QDomElement invertedColorRampElem = element.firstChildElement( "invertedcolorramp" );
if ( !invertedColorRampElem.isNull() )
r->setInvertedColorRamp( invertedColorRampElem.attribute( "value" ) == "1" );
}
QDomElement rotationElem = element.firstChildElement( "rotation" );
if ( !rotationElem.isNull() )
r->setRotationField( rotationElem.attribute( "field" ) );
QDomElement sizeScaleElem = element.firstChildElement( "sizescale" );
if ( !sizeScaleElem.isNull() )
{
r->setSizeScaleField( sizeScaleElem.attribute( "field" ) );
r->setScaleMethod( QgsSymbolLayerV2Utils::decodeScaleMethod( sizeScaleElem.attribute( "scalemethod" ) ) );
}
// TODO: symbol levels
return r;
}
void QgsCategorizedSymbolRendererV2Widget::addCategories()
{
QString attrName = cboCategorizedColumn->currentText();
int idx = mLayer->fieldNameIndex( attrName );
QList<QVariant> unique_vals;
mLayer->uniqueValues( idx, unique_vals );
//DlgAddCategories dlg(mStyle, createDefaultSymbol(), unique_vals, this);
//if (!dlg.exec())
// return;
QgsVectorColorRampV2* ramp = cboCategorizedColorRamp->currentColorRamp();
if ( ramp == NULL )
{
if ( cboCategorizedColorRamp->count() == 0 )
QMessageBox::critical( this, tr( "Error" ), tr( "There are no available color ramps. You can add them in Style Manager." ) );
else
QMessageBox::critical( this, tr( "Error" ), tr( "The selected color ramp is not available." ) );
return;
}
QgsCategoryList cats;
_createCategories( cats, unique_vals, mCategorizedSymbol, ramp );
bool deleteExisting = false;
if ( !mOldClassificationAttribute.isEmpty() &&
attrName != mOldClassificationAttribute &&
mRenderer->categories().count() > 0 )
{
int res = QMessageBox::question( this,
tr( "Confirm Delete" ),
tr( "The classification field was changed from '%1' to '%2'.\n"
"Should the existing classes be deleted before classification?" )
.arg( mOldClassificationAttribute ).arg( attrName ),
QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel );
if ( res == QMessageBox::Cancel )
{
return;
}
deleteExisting = ( res == QMessageBox::Yes );
}
if ( !deleteExisting )
{
QgsCategoryList prevCats = mRenderer->categories();
for ( int i = 0; i < cats.size(); ++i )
{
bool contains = false;
QVariant value = cats.at( i ).value();
for ( int j = 0; j < prevCats.size() && !contains; ++j )
{
if ( prevCats.at( j ).value() == value )
{
contains = true;
break;
}
}
if ( !contains )
prevCats.append( cats.at( i ) );
}
cats = prevCats;
}
mOldClassificationAttribute = attrName;
// TODO: if not all categories are desired, delete some!
/*
if (not dlg.readAllCats.isChecked())
{
cats2 = {}
for item in dlg.listCategories.selectedItems():
for k,c in cats.iteritems():
if item.text() == k.toString():
break
cats2[k] = c
cats = cats2
}
*/
// recreate renderer
QgsCategorizedSymbolRendererV2 *r = new QgsCategorizedSymbolRendererV2( attrName, cats );
r->setSourceSymbol( mCategorizedSymbol->clone() );
r->setSourceColorRamp( ramp->clone() );
r->setScaleMethod( mRenderer->scaleMethod() );
r->setSizeScaleField( mRenderer->sizeScaleField() );
r->setRotationField( mRenderer->rotationField() );
delete mRenderer;
mRenderer = r;
populateCategories();
}