private bool GetOrMakeLayer(string layerName, AcadDb.Transaction tr, out string cleanName)
{
cleanName = Utils.RemoveInvalidChars(layerName);
try
{
AcadDb.LayerTable lyrTbl = tr.GetObject(Doc.Database.LayerTableId, AcadDb.OpenMode.ForRead) as AcadDb.LayerTable;
if (lyrTbl.Has(cleanName))
{
return(true);
}
else
{
lyrTbl.UpgradeOpen();
var _layer = new AcadDb.LayerTableRecord();
// Assign the layer properties
_layer.Color = Autodesk.AutoCAD.Colors.Color.FromColorIndex(ColorMethod.ByColor, 7); // white
_layer.Name = cleanName;
// Append the new layer to the layer table and the transaction
lyrTbl.Add(_layer);
tr.AddNewlyCreatedDBObject(_layer, true);
}
}
catch { return(false); }
return(true);
}
private void DeleteLayersWithPrefix(string prefix, AcadDb.Transaction tr)
{
// Open the Layer table for read
var lyrTbl = (AcadDb.LayerTable)tr.GetObject(Doc.Database.LayerTableId, AcadDb.OpenMode.ForRead);
foreach (AcadDb.ObjectId layerId in lyrTbl)
{
AcadDb.LayerTableRecord layer = (AcadDb.LayerTableRecord)tr.GetObject(layerId, AcadDb.OpenMode.ForRead);
string layerName = layer.Name;
if (layerName.StartsWith(prefix))
{
layer.UpgradeOpen();
// cannot delete current layer: swap current layer to default layer "0" if current layer is to be deleted
if (Doc.Database.Clayer == layerId)
{
var defaultLayerID = lyrTbl["0"];
Doc.Database.Clayer = defaultLayerID;
}
layer.IsLocked = false;
// delete all objects on this layer
// TODO: this is ugly! is there a better way to delete layer objs instead of looping through each one?
var bt = (AcadDb.BlockTable)tr.GetObject(Doc.Database.BlockTableId, AcadDb.OpenMode.ForRead);
foreach (var btId in bt)
{
var block = (AcadDb.BlockTableRecord)tr.GetObject(btId, AcadDb.OpenMode.ForRead);
foreach (var entId in block)
{
var ent = (AcadDb.Entity)tr.GetObject(entId, AcadDb.OpenMode.ForRead);
if (ent.Layer == layerName)
{
ent.UpgradeOpen();
ent.Erase();
}
}
}
layer.Erase();
}
}
}
public override List <ISelectionFilter> GetSelectionFilters()
{
var layers = new List <string>();
using (AcadDb.Transaction tr = Doc.Database.TransactionManager.StartTransaction())
{
AcadDb.LayerTable lyrTbl = tr.GetObject(Doc.Database.LayerTableId, AcadDb.OpenMode.ForRead) as AcadDb.LayerTable;
foreach (AcadDb.ObjectId objId in lyrTbl)
{
AcadDb.LayerTableRecord lyrTblRec = tr.GetObject(objId, AcadDb.OpenMode.ForRead) as AcadDb.LayerTableRecord;
layers.Add(lyrTblRec.Name);
}
tr.Commit();
}
return(new List <ISelectionFilter>()
{
new ListSelectionFilter {
Name = "Layers", Icon = "Filter", Description = "Selects objects based on their layers.", Values = layers
}
});
}