public override void Undo()
{
view.Scroll = state.scroll;
Document doc = view.Document;
FitModes fit = view.CurrentFit;
double zoom = view.Zoom;
Bookmark root = doc.BookmarkRoot;
if (root != null)
{
Bookmark child = GetRootBookmark(root, state.bookmarks);
if (child != null)
{
child.Destroy();
}
}
if (doc.OptionalContentGroups.Count > state.layers)
{
IList <OptionalContentGroup> groups = doc.OptionalContentGroups;
for (int i = state.layers; i < groups.Count; ++i)
{
doc.RemoveOCG(groups[i]);
}
}
view.ClearPageCache();
doc.DeletePages(state.pages, doc.NumPages - 1);
view.Document = doc;
view.setZoom(fit, zoom);
}