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Disable feature fetching for symbol selector widget preview

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It's just too expensive for any remote provider, e.g. wfs, and
causes many ui lockups. Revisit when support for iterator
timeouts is more mature.
This commit is contained in:
Nyall Dawson 2018-08-16 17:04:55 +10:00
parent 291224e8c7
commit b422504c37
1 changed files with 4 additions and 0 deletions
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4
src/gui/symbology/qgssymbolselectordialog.cpp
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@ -253,11 +253,15 @@ QgsSymbolSelectorWidget::QgsSymbolSelectorWidget( QgsSymbol *symbol, QgsStyle *s
//get first feature from layer for previews
if ( mVectorLayer )
{
#if 0 // this is too expensive to do for many providers. TODO revisit when support for connection timeouts is complete across all providers
// short timeout for request - it doesn't really matter if we don't get the feature, and this call is blocking UI
QgsFeatureIterator it = mVectorLayer->getFeatures( QgsFeatureRequest().setLimit( 1 ).setConnectionTimeout( 100 ) );
it.nextFeature( mPreviewFeature );
#endif
mPreviewExpressionContext.appendScopes( QgsExpressionContextUtils::globalProjectLayerScopes( mVectorLayer ) );
#if 0
mPreviewExpressionContext.setFeature( mPreviewFeature );
#endif
}
else
{