Annotations

An annotation is a rectangular area on a PDF page that the user can interact with. Examples are ‘links’, ‘sticky notes’ and ‘widgets’. All annotation classes and related types live in the TallComponents.PDF.Annotations namespace and nested namespaces.

Annotation

Annotation is the abstract base class of all annotation classes. The figure below shows the class hierarchy of the annotations that we currently support:

annotation-class-hierarchy

Class Annotation has the following members that are common to all annotation types:

Annotation members

Public properties
PageThe page that contains this annotation. Read-only.
Left, Bottom, Right, Top, Width and HeightThe position and size in page space. Right and Top are read-only.
BorderWidthWidth of the border. 0 means no border.
BorderColorColor of the border (must be RgbColor for non-widget annotation).
BorderStyleStyle of the border (Solid, Dashed, etc.)
InvisibleThe annotation is not visible on screen.
LockedWhether the annotation is locked in the viewer application.
PrintThe annotation is printed.
Public methods
FlattenThe page that contains this annotation. Read-only.
AcceptSupports the Visitor pattern.

Widget

As a special case, a widget annotation (or widget) is the visual representation of a field that provides interactive access to the field value. In theory, a field can have multiple widgets. Widgets will be discussed in more detail in Forms.

Link

The link annotation is a clickable area that executes a sequence of actions. To jump to a destination you add a single action of type GoToAction. To jump to a URL you add a single action of type UriAction. Of course you can add any number of actions of any type.

In addition to the members inherited from Annotation, Link has the following specific members:

Members specific to Link

Public properties
HighlightStyleThe visual effect that is used when the mouse is pressed inside the annotation area.
MouseUpActionsThe sequence of actions to execute when the mouse button is released in the Link area.

Code sample Add a cross-reference link inside the same document shows how to add a link to a page that points to another page. Code sample Add a link to an external PDF document shows how to add a link to a page that points to an external PDF document.

Markup

Markup annotations are used to mark-up a document. In a typical mark-up scenario, the author of a document asks a peer to review the document. The peer will add comments at specific location in the document, e.g. to mark-up a typo or to mark-up a figure that is not clear enough. Mark-ups can take several visual forms of which a simple textual note is the most common one.

Markup is the abstract base class of all markup annotations. It has a number of properties that are common to all markup annotations.

Memebers specific to Markup

Public properties
Replies, InReplyTo Respectively, all mark-ups that reply to this mark-up and the mark-up to which this mark-up replies. These two properties allow you to create a complete thread of mark-ups. InReplyTo is read-only.
Text The text of this mark-up. This text may contain simple formatting tags such as bold.
Popup The pop-up that displays the text of this mark-up.
Opacity The opacity of this mark-up (0 means fully transparent, 255 means fully opaque).
Author, CreationDate and Subject The author, creation date and subject of this mark-up.

Note

A note is the most common mark-up. The class Note is a concrete specialization of the abstract base class Markup. It has the following specific members:

Members specific to Note

Public properties
IconName Viewer applications have predefined icons for at least the following names: Comment, Key, Note, Help, NewParagraph, Paragraph and Insert.
StateModelState model of this mark-up. Existing state models:  
  • Marked: according to this model, a mark-up is marked or not.
  • Review: according to this model, a mark-up has one of the following states: None, Accepted, Rejected, Cancelled or Completed.
  • Migration: according to this model, a mark-up has one of the following states: None, Confirmed or NotConfirmed.
  • None. This mark-up has no state model.
Marked Meaningful if state model is Marked.
ReviewState Meaningful if state model is Review.
MigrationState Meaningful if state model is Migration.

Popup

This is a special annotation that displays the text of a markup as a pop-up message. The pop-up allows the user to edit the text. A pop-up is associated with a markup through its Markup property. A markup is associated with a popup through its Popup property. Note that the displayed text is a property of the markup, not of the pop-up.

In addition to the members inherited from Annotation, Popup has the following specific members:

Members specific to Popup

Public properties
Open Whether the pop-up should initially be displayed open.
Markup The Markup to which this pop-up belongs. Read-only.

The following code sample creates a new document with a single page. The page has a note with an open pop-up noting that the page is empty.

// create a new document with a single empty page
Document document = new Document();
Page page = new Page( PageSize.Letter );
document.Pages.Add( page );

// add a new note
Note note = new Note( 300, 300, 10, 10 );
note.Text = "This page is empty.";
note.IconName = "Note";
page.Markups.Add( note );

// attach an open popup to the note
Popup popup = new Popup( 320, 350, 200, 100 );
popup.Open = true;
note.Popup = popup;

// save the new document
sing ( FileStream file = new FileStream( 
   @"..\..\note.pdf", 
   FileMode.Create, FileAccess.Write ) )
{
   document.Write( file );
}

Code sample: Create a new document with a single page, a note and a popup (AddNote)

created-from-code-sample

Created from Code sample Create a new document with a single page, a note and a popup

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