void QgsAttributeTypeDialog::defaultExpressionChanged()
{
QString expression = mExpressionWidget->expression();
if ( expression.isEmpty() )
{
mDefaultPreviewLabel->setText( QString() );
return;
}
QgsExpressionContext context = mLayer->createExpressionContext();
if ( !mPreviewFeature.isValid() )
{
// get first feature
QgsFeatureIterator it = mLayer->getFeatures( QgsFeatureRequest().setLimit( 1 ) );
it.nextFeature( mPreviewFeature );
}
context.setFeature( mPreviewFeature );
QgsExpression exp = QgsExpression( expression );
exp.prepare( &context );
if ( exp.hasParserError() )
{
mDefaultPreviewLabel->setText( "<i>" + exp.parserErrorString() + "</i>" );
return;
}
QVariant val = exp.evaluate( &context );
if ( exp.hasEvalError() )
{
mDefaultPreviewLabel->setText( "<i>" + exp.evalErrorString() + "</i>" );
return;
}
QString previewText = val.toString();
QgsEditorWidgetFactory *factory = QgsEditorWidgetRegistry::instance()->factory( editorWidgetType() );
if ( factory )
{
previewText = factory->representValue( mLayer, mFieldIdx, editorWidgetConfig(), QVariant(), val );
}
mDefaultPreviewLabel->setText( "<i>" + previewText + "</i>" );
}
bool QgsFeatureListModel::setDisplayExpression( const QString expression )
{
const QgsFields fields = mFilterModel->layer()->dataProvider()->fields();
QgsExpression* exp = new QgsExpression( expression );
exp->prepare( fields );
if ( exp->hasParserError() )
{
mParserErrorString = exp->parserErrorString();
delete exp;
return false;
}
delete mExpression;
mExpression = exp;
emit( dataChanged( index( 0, 0 ), index( rowCount() - 1, 0 ) ) );
return true;
}
void test_from_ogc_filter()
{
QFETCH( QString, xmlText );
QFETCH( QString, dumpText );
QDomDocument doc;
QVERIFY(doc.setContent(xmlText, true));
QDomElement rootElem = doc.documentElement();
QgsExpression* expr = QgsExpression::createFromOgcFilter( rootElem );
QVERIFY( expr );
qDebug("OGC XML : %s", xmlText.toAscii().data() );
qDebug("EXPR-DUMP: %s", expr->dump().toAscii().data() );
if ( expr->hasParserError() )
qDebug( "ERROR: %s ", expr->parserErrorString().toAscii().data() );
QVERIFY( !expr->hasParserError() );
QCOMPARE( dumpText, expr->dump() );
delete expr;
}
bool QgsFeatureListModel::setDisplayExpression( const QString& expression )
{
QgsExpression* exp = new QgsExpression( expression );
QgsExpressionContext context;
context << QgsExpressionContextUtils::globalScope()
<< QgsExpressionContextUtils::projectScope()
<< QgsExpressionContextUtils::layerScope( mFilterModel->layer() );
exp->prepare( &context );
if ( exp->hasParserError() )
{
mParserErrorString = exp->parserErrorString();
delete exp;
return false;
}
delete mExpression;
mExpression = exp;
emit dataChanged( index( 0, 0 ), index( rowCount() - 1, 0 ) );
return true;
}