CHAPTER 8
598
Interactive Features
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80R
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8.3.3 Presentations
Some PDF viewer applications may allow a document to be displayed in the form
of a
presentation
or slide show, advancing from one page to the next either auto-
matically or under user control. In addition, PDF 1.5 introduces the ability to ad-
vance between different states of the same page (see “Sub-page Navigation” on
Note:
PDF 1.4 introduces a different mechanism, known as
alternate presentations,
for slide show displays, described in Section 9.4, “Alternate Presentations.”
A page object (see “Page Objects” on page 144) may contain two optional entries,
Dur
and
Trans
(PDF 1.1),
to specify how to display that page in presentation
mode. The
Trans
entry contains a
transition dictionary
describing the style and
duration of the visual transition to use when moving from another page to the
given page during a presentation. Table 8.13 shows the contents of the transition
dictionary. (Some of the entries shown are needed only for certain transition
styles, as indicated in the table.)
The
Dur
entry in the page object specifies the page’s
display duration
(also called
its
advance timing):
the maximum length of time, in seconds, that the page is dis-
played before the presentation automatically advances to the next page. (The user
can advance the page manually before the specified time has expired.) If no
Dur
entry is specified in the page object, the page does not advance automatically.