2 Visual Components Manuals

4.7.1.2 Option bytes
This field accepts a byte array. The length of this byte array has to correspond at least to the number of texts
used in the text group. Using this byte array, texts can be locked runtime (value = 1) or made invisible (value =
2). Each index in the array describes the state of its corresponding text element (OptionByte[10] = Text #10 in
the text group). Value 0 sets the text back to visible and unlocked.
4.7.1.3 Cursor Character
The cursor character has been integrated into the ListBox input control for black/white displays.
Since colors can't be configured to differentiate between selected elements
and cursor elements, a character has been introduced for the cursor.
This character is inserted before the text where the cursor is located.
4.7.1.4 Selected Item
Variable on which the index of the selected item is mapped.
4.7.1.5 Status
Status variable. This variable can be used to lock this control or make it invisible.
(see also Controlling Fields with Status Variables).
Up key: Key for upward movement in the ListBox
Down key: Key for downward movement in the ListBox
Select key: Key for selecting an element
Note when configuring control keys:
Keys for up/down control have to be configured. If an Enter key is already present on the operator panel (or
display), then a selection key is not necessary. In this case, the Enter key itself is used as the selection key. The
Enter key can even be used to switch to the next selection element. If a separate selection key has been
configured, then a "Goto Input" control key is required to move to other input fields.
Procedure:
At runtime, the user receives a cursor for choosing text and a cursor for the selected element (text group
variable). In contrast to the ListBox output control, scrolling up or down through the entries is possible without
changing the value of the connected variable. The index of the element under the cursor is written to the text
group variable with the Enter or selection key.
4.7.1.6 Colors
Introduction to Visual Components 2.3
338 4.7.1.2 Option bytes