public virtual void NestedExpressionTest()
{
PdfDocument tempDoc = new PdfDocument(new PdfWriter(new MemoryStream()));
// create expression with the OR operator as the first parameter
PdfVisibilityExpression expression = new PdfVisibilityExpression(PdfName.Or);
// add an empty dictionary as the second parameter
expression.AddOperand(new PdfLayer((PdfDictionary) new PdfDictionary().MakeIndirect(tempDoc)));
// create a nested expression with the AND operator and two empty dictionaries as parameters
PdfVisibilityExpression nestedExpression = new PdfVisibilityExpression(PdfName.And);
nestedExpression.AddOperand(new PdfLayer((PdfDictionary) new PdfDictionary().MakeIndirect(tempDoc)));
nestedExpression.AddOperand(new PdfLayer((PdfDictionary) new PdfDictionary().MakeIndirect(tempDoc)));
// add another expression as the third parameter
expression.AddOperand(nestedExpression);
PdfObject expressionObject = expression.GetPdfObject();
NUnit.Framework.Assert.IsTrue(expressionObject is PdfArray);
NUnit.Framework.Assert.AreEqual(3, ((PdfArray)expressionObject).Size());
NUnit.Framework.Assert.AreEqual(PdfName.Or, ((PdfArray)expressionObject).GetAsName(0));
PdfObject child = ((PdfArray)expressionObject).Get(2);
NUnit.Framework.Assert.IsTrue(child is PdfArray);
NUnit.Framework.Assert.AreEqual(3, ((PdfArray)child).Size());
NUnit.Framework.Assert.AreEqual(PdfName.And, ((PdfArray)child).Get(0));
}
public virtual void AndExpressionTest()
{
PdfDocument tempDoc = new PdfDocument(new PdfWriter(new MemoryStream()));
// create expression with the AND operator as the first parameter
PdfVisibilityExpression expression = new PdfVisibilityExpression(PdfName.And);
// add two empty dictionaries as the other parameters
expression.AddOperand(new PdfLayer((PdfDictionary) new PdfDictionary().MakeIndirect(tempDoc)));
expression.AddOperand(new PdfLayer((PdfDictionary) new PdfDictionary().MakeIndirect(tempDoc)));
PdfObject expressionObject = expression.GetPdfObject();
NUnit.Framework.Assert.IsTrue(expressionObject is PdfArray);
NUnit.Framework.Assert.AreEqual(3, ((PdfArray)expressionObject).Size());
NUnit.Framework.Assert.AreEqual(PdfName.And, ((PdfArray)expressionObject).GetAsName(0));
}
/// <summary>
/// Sets the visibility expression for content belonging to this
/// membership dictionary.
/// </summary>
/// <param name="visibilityExpression">
/// A (nested) array of which the first value is /And, /Or, or /Not
/// followed by a series of indirect references to OCGs or other visibility
/// expressions.
/// </param>
public virtual void SetVisibilityExpression(PdfVisibilityExpression visibilityExpression)
{
GetPdfObject().Put(PdfName.VE, visibilityExpression.GetPdfObject());
GetPdfObject().SetModified();
}