bool QgsMapToolShowHideLabels::showHideLabel( QgsVectorLayer* vlayer,
int fid,
bool hide )
{
// verify attribute table has proper field setup
bool showSuccess;
int showCol;
int show;
if ( !dataDefinedShowHide( vlayer, fid, show, showSuccess, showCol ) )
{
return false;
}
// check if attribute value is already the same
QgsFeature f;
if ( !vlayer->getFeatures( QgsFeatureRequest().setFilterFid( fid ).setFlags( QgsFeatureRequest::NoGeometry ) ).nextFeature( f ) )
{
return false;
}
int colVal = hide ? 0 : 1;
QVariant fQVal = f.attributes()[showCol];
bool convToInt;
int fVal = fQVal.toInt( &convToInt );
if ( !convToInt || fVal == colVal )
{
return false;
}
// different attribute value, edit table
QString labelText = currentLabelText( 24 );
QString editTxt = hide ? tr( "Hid label" ) : tr( "Showed label" );
vlayer->beginEditCommand( editTxt + QString( " '%1'" ).arg( labelText ) );
if ( !vlayer->changeAttributeValue( fid, showCol, colVal, true ) )
{
QgsDebugMsg( "Failed write to attribute table" );
vlayer->endEditCommand();
return false;
}
vlayer->endEditCommand();
return true;
}
bool QgsMapToolShowHideLabels::showHideLabel( QgsVectorLayer* vlayer,
const QgsFeatureId &fid,
bool hide )
{
// verify attribute table has proper field setup
bool showSuccess;
int showCol;
int showVal;
if ( !dataDefinedShowHide( vlayer, fid, showVal, showSuccess, showCol ) )
{
return false;
}
int curVal = hide ? 0 : 1;
// check if attribute value is already the same
if ( showSuccess && showVal == curVal )
{
return false;
}
// allow NULL (maybe default) value to stand for show label (i.e. 1)
// skip NULL attributes if trying to show label
if ( !showSuccess && curVal == 1 )
{
return false;
}
// different attribute value, edit table
if ( !vlayer->changeAttributeValue( fid, showCol, curVal ) )
{
QgsDebugMsg( "Failed write to attribute table" );
return false;
}
return true;
}
