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WRITE - list_elements
Syntax
... {AS CHECKBOX}
| {AS ICON}
| {AS SYMBOL}
| {AS LINE} ... .
Alternatives:
1. ... AS CHECKBOX
2. ... AS ICON
3. ... AS SYMBOL
4. ... AS LINE
Effect
These additions are used to represent special list elements.
The data object dobj in the output must have certain properties. The additions cannot be used together. If they are used with the additions for
internal formats and external formats, they can only be used to a limited extent.
... AS CHECKBOX
Effect
The output of this addition is a single-character checkbox that is ready for input. dobj expects a character-like data type of length 1. If the first character in dobj is "X" or "x", the checkbox is shown as selected. If the first character is not "X" or "x", the checkbox is shown as empty. If dobj is an empty data object of the type string, the checkbox is not in the output.
The user can select and deselect the checkbox in the list displayed on the screen. If the user selects the checkbox, the first character of the assigned field in the list is set to "X". If the user deselects it, it is set to blank. The change is stored in the list buffer and can be evaluated during a list event.
If the addition AS CHECKBOX is used, no list output len is allowed after AT. Except for INPUT, NO-GAP, and UNDER, the other additions specified at the same time for internal formats and external formats are ignored.
The addition AS CHECKBOX has the same effect as specifying the addition
INPUT ON simultaneously. The standard settings or a format INPUT OFF
set by a FORMAT statement are overridden for the current WRITE
statement. To make the checkbox not ready for input, the addition INPUT OFF must be used simultaneously.
Note
If a list line contains only a checkbox with a blank, it is displayed only if the statement SET BLANK LINES ON is executed beforehand.
Example
Displays two checkbox fields and evaluates the user input in the event AT LINE-SELECTION.
REPORT test NO STANDARD PAGE HEADING.
DATA: check1 TYPE c LENGTH 1 VALUE 'X',
check2 TYPE c LENGTH 1 VALUE ' '.
START-OF-SELECTION.
WRITE: / check1 AS CHECKBOX, 'Checkbox 1',
/ check2 AS CHECKBOX, 'Checkbox 2'.
AT LINE-SELECTION.
READ: LINE 1 FIELD VALUE check1,
LINE 2 FIELD VALUE check2.
... AS ICON
Effect
This addition produces icons. Be aware that not all icons are suitable for spool lists. dobj expects data objects of the type c whose initial characters can be interpreted as the internal ID of an icon by the runtime environment.
In the type group ICON, a constant is declared for each icon that can be displayed. The names of the constants can be taken from the type group or the output of the SHOWICON program. This program also shows the corresponding output length and whether an icon can be spooled or not.
If the content of dobj cannot be interpreted as an icon or the content is changed by concurrent use of other additions for
internal formats or external formats, blanks are produced instead of icons.
Notes
Example
Displays a traffic light icon.
WRITE icon_green_light AS ICON.
... AS SYMBOL
Effect
This addition produces all the characters of the data object dobj as symbols. The
type group SYM
declares constants with a length of 1 for each character that can be displayed as a symbol, and whose
name reflects the meaning of the symbol. The names of the constants and the meaning and length of the
symbols can be taken from the type group or from the output of the program SHOWSYMB.
Note
The output length is determined, as usual, either implicitly using the data type of dobj or by being specified explicitly.
Example
Displays a hand symbol.
WRITE sym_left_hand AS SYMBOL.
... AS LINE
Effect
This addition produces line
elements with the output length 1. Line elements are corners, crosses, lines, and T sections.
dobj expects data objects of the type c whose content can be interpreted as line elements by the runtime environment. The
type group LINE declares the line element constants displayed in the following table.
Constant | Meaning |
line_space | Blank |
line_top_left_corner | Top left corner |
line_bottom_left_corner | Bottom left corner |
line_top_right_corner | Top right corner |
line_bottom_right_corner | Bottom right corner |
line_horizontal_line | Horizontal line |
line_vertical_line | Vertical line |
line_left_middle_corner | T section turned to the left |
line_right_middle_corner | T section turned to the right |
line_bottom_middle_corner | Reversed T section |
line_top_middle_corner | T section |
line_cross | Cross |
If dobj has different content or the content is changed by concurrent use of other additions for
internal formats, a blank is produced instead of a line element. The addition FRAMES OFF must not be specified simultaneously. The other additions for
external formats and QUICKINFO are ignored in the output of line elements.
Notes
Example
Produces four adjoining rectangles.
WRITE: /10 line_top_left_corner AS LINE NO-GAP,
line_top_middle_corner AS LINE NO-GAP,
line_top_right_corner AS LINE,
/10 line_left_middle_corner AS LINE NO-GAP,
line_cross AS LINE NO-GAP,
line_right_middle_corner AS LINE,
/10 line_bottom_left_corner AS LINE NO-GAP,
line_bottom_middle_corner AS LINE NO-GAP,
line_bottom_right_corner AS LINE.