void QgsFieldExpressionWidget::updateLineEditStyle( const QString& expression )
{
QPalette palette;
if ( !isEnabled() )
{
palette.setColor( QPalette::Text, Qt::gray );
}
else
{
bool isExpression, isValid;
if ( !expression.isEmpty() )
{
isExpression = true;
isValid = isExpressionValid( expression );
}
else
{
currentField( &isExpression, &isValid );
}
QFont font = mCombo->lineEdit()->font();
font.setItalic( isExpression );
mCombo->lineEdit()->setFont( font );
if ( isExpression && !isValid )
{
palette.setColor( QPalette::Text, Qt::red );
}
else
{
palette.setColor( QPalette::Text, Qt::black );
}
}
mCombo->lineEdit()->setPalette( palette );
}
void QgsFieldExpressionWidget::currentFieldChanged( int i /* =0 */ )
{
Q_UNUSED( i );
updateLineEditStyle();
bool isExpression, isValid;
QString fieldName = currentField( &isExpression, &isValid );
emit fieldChanged( fieldName );
emit fieldChanged( fieldName, isValid );
}
void QgsFieldComboBox::setField( const QString& fieldName )
{
QModelIndex idx = mFieldProxyModel->sourceFieldModel()->indexFromName( fieldName );
if ( idx.isValid() )
{
QModelIndex proxyIdx = mFieldProxyModel->mapFromSource( idx );
if ( proxyIdx.isValid() )
{
setCurrentIndex( idx.row() );
emit fieldChanged( currentField() );
return;
}
}
setCurrentIndex( -1 );
}
void QgsFieldExpressionWidget::currentFieldChanged()
{
updateLineEditStyle();
bool isExpression, isValid;
QString fieldName = currentField( &isExpression, &isValid );
// display tooltip if widget is shorter than expression
QFontMetrics metrics( mCombo->lineEdit()->font() );
if ( metrics.width( fieldName ) > mCombo->lineEdit()->width() )
{
mCombo->setToolTip( fieldName );
}
else
{
mCombo->setToolTip( "" );
}
emit fieldChanged( fieldName );
emit fieldChanged( fieldName, isValid );
}
void QgsFieldExpressionWidget::editExpression()
{
QString currentExpression = currentField();
QgsVectorLayer* vl = layer();
if ( !vl )
return;
QgsExpressionBuilderDialog dlg( vl, currentExpression );
if ( !mDa.isNull() )
{
dlg.setGeomCalculator( *mDa );
}
dlg.setWindowTitle( mExpressionDialogTitle );
if ( dlg.exec() )
{
QString newExpression = dlg.expressionText();
setField( newExpression );
}
}
void QgsFieldComboBox::indexChanged( int i )
{
Q_UNUSED( i );
QString name = currentField();
emit fieldChanged( name );
}
