topic Background mask for Multiline Attribute In Block in .NET Forum

Background mask for Multiline Attribute In Block

brianchapmandesign — Tue, 06 Feb 2018 15:32:51 GMT

This doesn't seem to turn on the background mask for a multiline attribute in a block. Anyone know what will?

BlockReference blkRef = (BlockReference)tr.GetObject(blkId, OpenMode.ForRead);
                            BlockTableRecord btr = (BlockTableRecord)tr.GetObject(blkRef.BlockTableRecord, OpenMode.ForRead);
                            AttributeCollection attCol = blkRef.AttributeCollection;
                            foreach (ObjectId attId in attCol)
                            {
                                AttributeReference attRef = (AttributeReference)tr.GetObject(attId, OpenMode.ForRead);
 
                                if (attRef.IsMTextAttribute)
                                {
                                    btr.UpgradeOpen();
                                    attRef.UpgradeOpen();        
                                    attRef.MTextAttribute.BackgroundFillColor = Autodesk.AutoCAD.Colors.Color.FromColorIndex(Autodesk.AutoCAD.Colors.ColorMethod.None, 198);
                                    attRef.MTextAttribute.UseBackgroundColor = false;
                                    attRef.UpdateMTextAttribute();
                                    blkRef.RecordGraphicsModified(true);

Re: Background mask for Multiline Attribute In Block

_gile — Tue, 06 Feb 2018 16:12:46 GMT

@friendfromarea51 wrote:

This doesn't seem to turn on the background mask for a multiline attribute in a block. Anyone know what will?

BlockReference blkRef = (BlockReference)tr.GetObject(blkId, OpenMode.ForRead);
                            BlockTableRecord btr = (BlockTableRecord)tr.GetObject(blkRef.BlockTableRecord, OpenMode.ForRead);
                            AttributeCollection attCol = blkRef.AttributeCollection;
                            foreach (ObjectId attId in attCol)
                            {
                                AttributeReference attRef = (AttributeReference)tr.GetObject(attId, OpenMode.ForRead);
 
                                if (attRef.IsMTextAttribute)
                                {
                                    btr.UpgradeOpen();
                                    attRef.UpgradeOpen();        
                                    attRef.MTextAttribute.BackgroundFillColor = Autodesk.AutoCAD.Colors.Color.FromColorIndex(Autodesk.AutoCAD.Colors.ColorMethod.None, 198);
                                    attRef.MTextAttribute.UseBackgroundColor = false;
                                    attRef.UpdateMTextAttribute();
                                    blkRef.RecordGraphicsModified(true);

Just having a quick look at your code, did you try with true instead?

attRef.MTextAttribute.UseBackgroundColor = true;

Re: Background mask for Multiline Attribute In Block

brianchapmandesign — Tue, 06 Feb 2018 18:06:39 GMT

Thanks Gile, I did 😕 Appears to not work either.

Re: Background mask for Multiline Attribute In Block

ActivistInvestor — Tue, 06 Feb 2018 19:06:28 GMT

Here is the source for the AttributeReference.MTextAttribute property:

// Autodesk.AutoCAD.DatabaseServices.AttributeReference
public MText MTextAttribute
{
	get
	{
		IntPtr unmanagedObjPtr = new IntPtr(<Module>.AcDbAttribute.getMTextAttribute(this.GetImpObj()));
		return new MText(unmanagedObjPtr, false);
	}
	set
	{
		int num = (int)<Module>.AcDbAttribute.setMTextAttribute(this.GetImpObj(), value.GetImpObj());
		if (num != 0)
		{
			throw new Autodesk.AutoCAD.Runtime.Exception((ErrorStatus)num);
		}
	}
}

Each use of that property produces a new MText managed wrapper. The wrapper is not stored by the AtttribueReference, and it doesn't know or care what you do with it, other than that it must be disposed.

When you do this:

 attRef.MTextAttribute.BackgroundFillColor = Autodesk.AutoCAD.Colors... blah blah blah
 attRef.MTextAttribute.UseBackgroundColor = false;

you are assigning the value of one property to each of two different MText objects.

You instead have to do this:

 MText mtext = attRef.MtextAttribute;
 mtext.BackgroundFillColor = Autodesk.AutoCAD.Colors... blah blah blah
 mtext.UseBackgroundColor = true;
 attRef.MtextAttribute = mtext;

@friendfromarea51 wrote:

This doesn't seem to turn on the background mask for a multiline attribute in a block. Anyone know what will?

BlockReference blkRef = (BlockReference)tr.GetObject(blkId, OpenMode.ForRead);
                            BlockTableRecord btr = (BlockTableRecord)tr.GetObject(blkRef.BlockTableRecord, OpenMode.ForRead);
                            AttributeCollection attCol = blkRef.AttributeCollection;
                            foreach (ObjectId attId in attCol)
                            {
                                AttributeReference attRef = (AttributeReference)tr.GetObject(attId, OpenMode.ForRead);
 
                                if (attRef.IsMTextAttribute)
                                {
                                    btr.UpgradeOpen();
                                    attRef.UpgradeOpen();        
                                    attRef.MTextAttribute.BackgroundFillColor = Autodesk.AutoCAD.Colors.Color.FromColorIndex(Autodesk.AutoCAD.Colors.ColorMethod.None, 198);
                                    attRef.MTextAttribute.UseBackgroundColor = false;
                                    attRef.UpdateMTextAttribute();
                                    blkRef.RecordGraphicsModified(true);

Re: Background mask for Multiline Attribute In Block

brianchapmandesign — Tue, 06 Feb 2018 21:15:08 GMT

Thank you both