I put your code into a test Add-In and made as few modifications as needed to get it to run (just some constant values and document references):
public void PerformTest()
{
double fromX = 0;
double fromY = 0;
ITextElement leftFromTextElement = new TextElementClass();
IElement leftFromElement = leftFromTextElement as IElement;
IElementProperties leftFromProperties = leftFromElement as IElementProperties;
leftFromProperties.Name = "LF:" + "TEST";
leftFromTextElement.Text = "Sample text to go in a callout to test gettting the size. " +
"\r\nThis adds some text on a second line." +
"\r\nThis adds some text on a third line.";
ESRI.ArcGIS.Geometry.Point point = new ESRI.ArcGIS.Geometry.Point();
point.PutCoords(fromX, fromY + 0);
leftFromElement.Geometry = point;
// Create text symbology
IFormattedTextSymbol textSymLeftAlign = new TextSymbol() as IFormattedTextSymbol;
stdole.IFontDisp fontFrom = textSymLeftAlign.Font;
fontFrom.Size = 8;
textSymLeftAlign.Font = fontFrom;
textSymLeftAlign.HorizontalAlignment = esriTextHorizontalAlignment.esriTHALeft;
ICallout callOut = new BalloonCalloutClass();
textSymLeftAlign.Background = (ITextBackground)callOut;
// Set anchor point
ESRI.ArcGIS.Geometry.Point anchorPTFrom = new ESRI.ArcGIS.Geometry.Point();
anchorPTFrom.PutCoords(fromX, fromY);
callOut.AnchorPoint = anchorPTFrom;
leftFromTextElement.Symbol = textSymLeftAlign;
IGraphicsContainer graphicsContainer = ArcMap.Document.ActivatedView as IGraphicsContainer;
graphicsContainer.AddElement(leftFromElement, 0);
leftFromElement.Activate(ArcMap.Document.ActivatedView.ScreenDisplay);
//Testing to see if I can figure out extent of callout graphic
IEnvelope elementEnvelope = new EnvelopeClass();
leftFromElement.QueryBounds(ArcMap.Document.ActiveView.ScreenDisplay, elementEnvelope);
System.Diagnostics.Debug.WriteLine("Element: " + elementEnvelope.Width + ", " + elementEnvelope.Height);
}
The output in Page Layout is:Element: 2.85220000000118, 0.530399999999645The output in Data View is:Element: 6608.73942823708, 1228.99884448946These look to me to correspond to the width and height of the callout box. Isn't that what you are looking for?
