CHAPTER 8
670
Interactive Features
Before a rendition action is executed, the viewer application must make sure that
the
P
entry of the screen annotation dictionary references a valid page object and
that the annotation is present in the page object’s
Annots
array (see Table 3.27).
A rendition may play in the rectangle occupied by a screen annotation, even if the
annotation itself is not visible; for example, if its Hidden or NoView flags (see Ta-
ble 8.16) are set. If a screen annotation is not visible because its location on the
page is not being displayed by the viewer, the rendition is not visible. However, it
may become visible if the view changes, such as by scrolling.
Transition Actions
A
transition action (PDF 1.5)
can be used to control drawing during a sequence of
actions. As discussed in Section 8.5.1, “Action Dictionaries,” the
Next
entry in an
action dictionary can specify a sequence of actions. Viewer applications should
normally suspend drawing when such a sequence begins and resume drawing
when it ends. If a transition action is present during a sequence, the viewer should
render the state of the page viewing area as it exists after completion of the previous
action and display it using a transition specified in the action dictionary (see Table
8.65). Once this transition completes, drawing should be suspended again.
TABLE 8.65 Additional entries specific to a transition action
KEY
TYPE
VALUE
S
name
dictionary
(Required)
The type of action that this dictionary describes; must be
Trans
for a
transition action.
(Required)
The transition to use for the update of the display (see Table 8.13).
Trans
Go-To-3D-View Actions
A
go-to-3D-view action (PDF 1.6)
identifies a 3D annotation and specifies a view
for the annotation to use (see Section 9.5, “3D Artwork”). Table 8.66 shows the
entries in a go-to-3D-view action dictionary.
TABLE 8.66 Additional entries specific to a go-to-3D-view action
KEY
TYPE
VALUE
S
name
(Required)
The type of action that this dictionary describes; must be
GoTo3DView
for a transition action.
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