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added validity checking prior to adding vector layer

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git-svn-id: http://svn.osgeo.org/qgis/trunk@587 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
gsherman 2004-01-25 07:34:28 +00:00
parent 6f5652e4ea
commit 249f85df22
2 changed files with 23 additions and 12 deletions
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24
src/qgisapp.cpp
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@ -499,16 +499,22 @@ void QgisApp::addDatabaseLayer()
// create the layer // create the layer
//qWarning("creating lyr"); //qWarning("creating lyr");
QgsVectorLayer *lyr = new QgsVectorLayer(connInfo + " table=" + *it, *it, "postgres"); QgsVectorLayer *lyr = new QgsVectorLayer(connInfo + " table=" + *it, *it, "postgres");
if(lyr->isValid()){
// init the context menu so it can connect to slots in main app
lyr->initContextMenu(this);
// init the context menu so it can connect to slots in main app // give it a random color
lyr->initContextMenu(this); QgsSingleSymRenderer* renderer=new QgsSingleSymRenderer();//add single symbol renderer as default
lyr->setRenderer(renderer);
// give it a random color renderer->initializeSymbology(lyr);
QgsSingleSymRenderer* renderer=new QgsSingleSymRenderer();//add single symbol renderer as default // add it to the mapcanvas collection
lyr->setRenderer(renderer); mapCanvas->addLayer(lyr);
renderer->initializeSymbology(lyr); }else{
// add it to the mapcanvas collection std::cerr << *it << " is an invalid layer - not loaded" << std::endl;
mapCanvas->addLayer(lyr); QMessageBox::critical(this, tr("Invalid Layer"),
tr("%1 is an invalid layer and cannot be loaded.").arg(*it));
delete lyr;
}
//qWarning("incrementing iterator"); //qWarning("incrementing iterator");
++it; ++it;
} }

9
src/qgsdataprovider.h
View File

@ -115,7 +115,12 @@ public:
/**Returns the maximum value of an attributs /**Returns the maximum value of an attributs
@param position the number of the attribute*/ @param position the number of the attribute*/
virtual QString maxValue(int position)=0; virtual QString maxValue(int position)=0;
/**
* Returns true if this is a valid layer. It is up to individual providers
* to determine what constitutes a valid layer
*/
virtual bool isValid()=0;
}; };
#endif #endif