Represents the "PageMode" entry of the catalog dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a string representing a PDF name object.

The PDF specification states that this item assumes a value of "UseNone" if no value has been provided.

This item may take one of the following valid values:.

• UseNone
• UseOutlines
• UseThumbs
• FullScreen
• UseOC
• UseAttachments

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 28, page 74.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 3.25, page 23.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 29, page 99.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 242, page 458.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 245, page 555.

The PageMode entry names the initial display mode when the document is opened. Values include UseNone (no panels), UseOutlines (bookmarks), UseThumbs (page thumbnails), FullScreen, UseOC (optional content panel), and UseAttachments.