SECTION 8.6
719
Interactive Forms
KEY
TYPE
VALUE
IF
dictionary
(Optional; PDF 1.3; button fields only)
An icon fit dictionary (see Table 8.97) specify-
ing how to display a button field’s icon within the annotation rectangle of its widget
annotation.
(Required; choice fields only)
An array of options to be presented to the user. Each
element of the array can take either of two forms:
Opt
array
•
A text string representing one of the available options
•
A two-element array consisting of a text string representing one of the available op-
tions and a default appearance string for constructing the item’s appearance dynam-
ically at viewing time (see “Variable Text” on page 677)
A
dictionary
dictionary
text string or
text stream
(Optional)
An action to be performed when this field’s widget annotation is activated
(see Section 8.5, “Actions”).
(Optional)
An additional-actions dictionary defining the field’s behavior in response
to various trigger events (see Section 8.5.2, “Trigger Events”).
(Optional; PDF 1.5)
A rich text string, as described in “Rich Text Strings” on page 680.
AA
RV
In an FDF field dictionary representing a button field, the optional
IF
entry holds
an
icon fit dictionary (PDF 1.3)
specifying how to display the button’s icon within
the annotation rectangle of its widget annotation. Table 8.97 shows the contents
of this type of dictionary.
TABLE 8.97 Entries in an icon fit dictionary
KEY
TYPE
VALUE
SW
name
(Optional)
The circumstances under which the icon should be scaled inside the annota-
tion rectangle:
A
B
S
N
Always scale.
Scale only when the icon is bigger than the annotation rectangle.
Scale only when the icon is smaller than the annotation rectangle.
Never scale.
Default value:
A
.