private void AddLayerToMapAsync(IDatabaseLayerItem item)
{
item.ShowLoadingIndicator();
Task <IDatasource> .Factory.StartNew(() =>
{
var timer = new Stopwatch();
timer.Start();
var ds = GeoSource.OpenFromIdentity(item.Identity) as IVectorLayer;
if (ds != null)
{
var data = ds.Data;
}
return(ds);
}).ContinueWith(t =>
{
if (t.Result != null)
{
if (_layerService.AddDatasource(t.Result))
{
int handle = _layerService.LastLayerHandle;
_context.Map.ZoomToLayer(handle);
}
}
item.HideLoadingIndicator();
}, TaskScheduler.FromCurrentSynchronizationContext());
}
public DatasourceInput(string filename)
{
// TODO: datasource must be closed in case of OGR layers
var identity = new LayerIdentity(filename);
var ds = GeoSource.OpenFromIdentity(identity);
Datasource = ds.GetLayers().FirstOrDefault();
}
/// <summary>
/// Reopens datasource which served as input for GisTool. The datasource will be searched
/// for among open layers, including in-memory layers and if not present, reoped from the disk.
/// </summary>
private static IDatasourceInput ReopenDatasource(
this DatasourcePointer ds,
IAppContext context,
IDatasourceInput oldInput)
{
int layerHandle = ds.LayerHandle;
if (layerHandle != -1)
{
var layer = context.Layers.ItemByHandle(layerHandle);
return(ReopenLayerInput(layer, oldInput));
}
var identity = ds.LayerIdentity;
if (identity != null)
{
// maybe it opened
var layer = context.Layers.FirstOrDefault(l => l.Identity == identity);
if (layer != null)
{
return(ReopenLayerInput(layer, oldInput));
}
// if not, let's try to open
var source = GeoSource.OpenFromIdentity(identity) as ILayerSource;
if (source != null)
{
return(new DatasourceInput(source));
}
}
return(null);
}