private static Rect GetImageableRect(PrintDialog dialog)
{
Invariant.Assert(dialog != null, "Dialog should not be null.");
PrintQueue queue = null;
PrintCapabilities capabilities = null;
PageImageableArea imageableArea = null;
Rect imageableRect = Rect.Empty;
// This gets the PringDocumentImageableArea.OriginWidth/OriginHeight
// of the PrintQueue the user chose in the dialog.
CodeAccessPermission printp = new System.Drawing.Printing.PrintingPermission(PrintingPermissionLevel.DefaultPrinting);
printp.Assert();//Blessed Assert to get PrintQueue and call GetPrintCapabilities
try
{
queue = dialog.PrintQueue;
if (queue != null)
{
capabilities = queue.GetPrintCapabilities();
}
}
finally
{
CodeAccessPermission.RevertAssert();
}
if (capabilities != null)
{
imageableArea = capabilities.PageImageableArea;
if (imageableArea != null)
{
imageableRect = new Rect(imageableArea.OriginWidth,
imageableArea.OriginHeight,
imageableArea.ExtentWidth,
imageableArea.ExtentHeight);
}
}
// If for any reason we couldn't get the actual printer's values
// we fallback to a constant and the values available from the
// PrintDialog.
if (imageableRect == Rect.Empty)
{
imageableRect = new Rect(NON_PRINTABLE_MARGIN,
NON_PRINTABLE_MARGIN,
dialog.PrintableAreaWidth,
dialog.PrintableAreaHeight);
}
return imageableRect;
}
