Annotations in PDF Viewer
- 4 minutes to read
The PDF Viewer allows you to create, edit, or remove text annotations (sticky notes) and text markup annotations (text highlights). You can also add comments and reviews associated with annotations.
Create an Annotation
User Interface
Use commands on the Comment ribbon page to create text markup annotations and sticky notes.
Enable a selection tool in the Text group and select the text that should have an annotation. Click Sticky Note to place the sticky note in a document.
You can also add text markup annotations from the context menu:
Tip
Use the PdfViewer.CursorMode property to change the viewer’s cursor mode in code.
Code
The following API allows you to add annotations in code:
Method | Description |
---|---|
PdfViewer.HighlightSelectedText | Highlights the selected text. |
PdfViewer.StrikethroughSelectedText | Strikes through the selected text. |
PdfViewer.UnderlineSelectedText | Underlines the selected text. |
PdfViewer.AddStickyNote | Adds a sticky note at the specified position. |
The code below highlights the selected text and adds a sticky note.
using System.Drawing;
using System.Windows.Forms;
namespace CreateMarkupAnnotation
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
// Load a document.
pdfViewer.LoadDocument("..\\..\\Demo.pdf");
// Select the text where the markup annotation will be created:
pdfViewer.FindText("PDF Viewer");
// Highlight selected text.
pdfViewer.HighlightSelectedText();
pdfViewer.AddStickyNote
(new PdfDocumentPosition(1, new PdfPoint(29, 568)),
"Comment", Color.Crimson);
}
}
}
Change Markup Tool Settings
User Interface
You can change the default settings for annotation tools. Click the drop-down arrow in the corresponding annotation tool and specify the color and opacity.
Code
To access the markup tool settings in code, use the PdfViewer.MarkupToolsSettings property.
The code sample below shows how to specify the default sticky note and text highlight settings:
PdfMarkupToolsSettings markupToolsSettings = pdfViewer.MarkupToolsSettings;
markupToolsSettings.StickyNoteIconName = PdfTextAnnotationIconName.Help;
markupToolsSettings.StickyNoteColor = Color.SkyBlue;
markupToolsSettings.TextHighlightColor = Color.IndianRed;
markupToolsSettings.TextHighlightDefaultSubject = "Spelling";
Edit Annotations
Use the Annotation Properties dialog to change the annotation properties. Right-click the annotation in the document or in the Comments navigation page and select Properties… to invoke this dialog.
Click Set as Default to use the new settings as the default settings for all annotations.
Add Replies and Reviews
The Comments navigation pane shows all document annotations. You can use it to add replies and set review statuses for the annotations.
Select an annotation on the pane, enter text in the invoked editor and click Reply to add the reply to the annotation.
To specify the review status, right-click an annotation, select Set Status, and set the status. Select None to remove the review status.
Remove Annotations
Right-click an annotation in document or in the Comments navigation pane and select Delete in the context menu to remove the annotation. You can also select an annotation and press the Delete key.
Annotation Events
The table below lists events that occur in response to various annotation actions:
Event | Description |
---|---|
AnnotationCreating | Fires when the user starts to create an annotation or after the corresponding method call. |
AnnotationCreated | Raises after the annotation is created. |
AnnotationGotFocus | Occurs when the annotation receives the input focus. |
AnnotationLostFocus | Fires when the annotation loses the input focus. |
AnnotationChanging | Fires when the user starts to change an annotation. |
AnnotationChanged | Occurs after the user changed the annotation using the Annotation Properties dialog. |
AnnotationDeleting | Occurs before the annotation is deleted. |
AnnotationDeleted | Occurs after the annotation is deleted. |
ReplyCreated | Occurs after the annotation reply is created in the Comments Panel. |
ReplyChanged | Occurs after the annotation reply is changed in the Comments Panel. |
ReplyDeleted | Occurs after the annotation reply is deleted in the Comments Panel. |