private void createButton3_Click(object sender, EventArgs e)
{
Doc doc = new Doc();
Properties props = Properties.FromDoc(doc, true);
List <Group> groups = new List <Group>();
for (int i = 1; i < 4; i++)
{
groups.Add(props.AddGroup("Layer " + i.ToString(), null));
}
// membership policies are simple to use but limited in scope
MembershipGroup alloff = props.AddMembershipGroup();
alloff.Policy = MembershipGroup.PolicyEnum.AllOff;
alloff.PolicyGroups = groups;
// membership visibility expressions are more complex but more powerful
MembershipGroup mgve = props.AddMembershipGroup();
ArrayAtom ve = mgve.MakeVisibilityExpression(MembershipGroup.LogicEnum.Or, groups);
mgve.EntryVE = mgve.MakeVisibilityExpression(MembershipGroup.LogicEnum.Not, new ArrayAtom[] { ve });
doc.FontSize = 36;
doc.Rect.Inset(20, 20);
for (int i = 0; i < 3; i++)
{
doc.Page = doc.AddPage();
Page page = (Page)doc.ObjectSoup[doc.Page];
Writer writer = new Writer(props, page);
OptionalContent.Layer layer1 = writer.AddGroup(alloff);
doc.AddText("The next line uses a Policy so that it is only visible if all layers are turned off...\r\n");
writer.StartLayer(layer1);
doc.AddText("I am normally invisible\r\n\r\n");
writer.EndLayer();
OptionalContent.Layer layer2 = writer.AddGroup(mgve);
doc.AddText("The next line uses a Visibility Expression so that it is only visible if all layers are turned off...\r\n");
writer.StartLayer(layer2);
doc.AddText("I am normally invisible\r\n");
writer.EndLayer();
doc.Flatten();
}
LoadPDF(doc);
}
