本文整理汇总了C++中QgsVectorLayer::updateFields方法的典型用法代码示例。如果您正苦于以下问题：C++ QgsVectorLayer::updateFields方法的具体用法？C++ QgsVectorLayer::updateFields怎么用？C++ QgsVectorLayer::updateFields使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类QgsVectorLayer的用法示例。
在下文中一共展示了QgsVectorLayer::updateFields方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: mapLayer
QgsVectorLayer* RgExportDlg::mapLayer() const
{
QgsVectorLayer* myLayer = NULL;
QString layerId = mcbLayers->itemData( mcbLayers->currentIndex() ).toString();
if ( layerId == "-1" )
{
// create a temporary layer
myLayer = new QgsVectorLayer( QString( "LineString?crs=epsg:4326&memoryid=%1" ).arg( QUuid::createUuid().toString() ), "shortest path", "memory" );
QgsVectorDataProvider *prov = myLayer->dataProvider();
if ( prov == NULL )
return NULL;
QList<QgsField> attrList;
attrList.append( QgsField( "length", QVariant::Double, "", 20, 8 ) );
attrList.append( QgsField( "time", QVariant::Double, "", 20, 8 ) );
prov->addAttributes( attrList );
myLayer->updateFields();
QList<QgsMapLayer *> myList;
myList << myLayer;
QgsMapLayerRegistry::instance()->addMapLayers( myList );
}
else
{
// return selected layer
myLayer = dynamic_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( layerId ) );
}
return myLayer;
} // QgsVectorLayer* RgExportDlg::vectorLayer() const示例2: onEditingStarted
void QgsGrassPlugin::onEditingStarted()
{
QgsDebugMsg( "Entered" );
QgsVectorLayer *vectorLayer = qobject_cast<QgsVectorLayer *>( sender() );
if ( !vectorLayer )
return;
QgsDebugMsg( "started editing of layer " + vectorLayer->name() );
// Set editing renderer
QgsGrassProvider* grassProvider = dynamic_cast<QgsGrassProvider*>( vectorLayer->dataProvider() );
if ( !grassProvider )
return;
QgsRendererV2Registry::instance()->addRenderer( new QgsRendererV2Metadata( "grassEdit",
QObject::tr( "GRASS Edit" ),
QgsGrassEditRenderer::create,
QIcon(),
QgsGrassEditRendererWidget::create ) );
QgsGrassEditRenderer *renderer = new QgsGrassEditRenderer();
mOldStyles[vectorLayer] = vectorLayer->styleManager()->currentStyle();
// Because the edit style may be stored to project:
// - do not translate because it may be loaded in QGIS running with different language
// - do not change the name until really necessary because it could not be found in project
QString editStyleName = "GRASS Edit"; // should not be translated
if ( vectorLayer->styleManager()->styles().contains( editStyleName ) )
{
QgsDebugMsg( editStyleName + " style exists -> set as current" );
vectorLayer->styleManager()->setCurrentStyle( editStyleName );
}
else
{
QgsDebugMsg( "create and set style " + editStyleName );
vectorLayer->styleManager()->addStyleFromLayer( editStyleName );
//vectorLayer->styleManager()->addStyle( editStyleName, QgsMapLayerStyle() );
vectorLayer->styleManager()->setCurrentStyle( editStyleName );
vectorLayer->setRendererV2( renderer );
}
grassProvider->startEditing( vectorLayer );
vectorLayer->updateFields();
connect( vectorLayer, SIGNAL( editingStopped() ), SLOT( onEditingStopped() ) );
resetEditActions();
}