How to add custom stamp to the WPF PDF Viewer menu item?

The WPF PDF Viewer default toolbar has two menu items for stamp annotation. One was "standard business”, and the other was "custom stamp". To add the custom stamp to the standard business menu, the pdf viewer allows us to add the custom stamp as an annotation in the StampAnnotations collection.  Meanwhile, there is no support for adding custom stamps to the custom stamp menu item directly. But this can be achieved at the sample level by adding the custom stamp as a template to the custom stamp menu.

Steps to add the custom stamp to the toolbar’s custom stamp menu item

The operations listed below should be performed within the loaded event of PdfViewerControl.

Step-1: Get the instance of the custom stamp menu item:

• Get the instance of the toolbar using its template name from PdfViewerControl.
• Access the stamp toggle button from the toolbar.
• Get the instance of the custom stamp menu item from the stamp toggle button.

​C#

//Get the instance of the toolbar using its template name.
DocumentToolbar toolbar = PdfViewer.Template.FindName("PART_Toolbar", PdfViewer) as DocumentToolbar;
 
//Get the instance of the stamp button using its template name.
ToggleButton stampButton = (ToggleButton)toolbar.Template.FindName("PART_Stamp", toolbar);
 
//Get the instance of custom stamp menu item.
MenuItem cutomMenuItem = (MenuItem)stampButton.ContextMenu.Items[1];

Step-2: Create a custom stamp template:

• Create an Image object for the desire image and add it as a child in the Viewbox.
• The Menu item was stored as a collection of Grid in the pdf viewer. Hence, create a Grid and add the Viewbox in it.

C#

//Create the instance of the image
System.Windows.Controls.Image image = new System.Windows.Controls.Image();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.UriSource = new Uri("filepath.png", UriKind.RelativeOrAbsolute);
bitmapImage.EndInit();
 
//Create the viewbox and the image.
Viewbox viewbox = new Viewbox(); viewbox.Child = image;
 
//Add the viewbox to the grid.
grid.Children.Add(viewbox);

Step-3: Add a custom stamp template to the custom stamp menu item:

• ​Now add the custom stamp template which is a grid to the custom stamp menu item instance.

C#

//Add the grid to the custom stamp menu item
cutomMenuItem.Items.Add(grid);

A complete work sample can be downloaded from SampleLink

See also

• Disabling the Toolbar items
• Adding your standard stamps in the toolbar
• Adding custom stamps in the toolbar