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Using the conceal attribute, entire sections of the display can be made to temporarily disappear.
Later, the hidden portion of the display can be made to reappear with its original characters and
associated attributes.
A typical application would use the conceal attribute as follows:
•
The host displays information in a region or touchkey.
•
Based on some event, the host program causes the now unnecessary information to disappear
temporarily by turning on the conceal attribute for all characters within the region or
touchkey.
•
When the original information is required again, the host turns off the conceal attribute for
the characters within the region or touchkey and the original information reappears, complete
with its associated attributes.
When using the conceal attribute, note the following:
•
To turn the conceal attribute on or off within a region or touchkey, use the Reverse Character
Attributes in a Region or Reverse Character Attributes in a Touchkey commands rather than
the Modify Character Attributes in a Region or Modify Character Attributes in a Touchkey
commands. The former commands only change the state of the conceal attribute without
affecting the state of any of the other attributes in the region or touchkey. The latter
commands change the state of the conceal attribute and set all other attributes as determined
by the last Select Character Attributes Command. This usually has the effect turning off any
other attributes in the region or touchkey so that when the characters are unconcealed, they
no longer appear with all their previous attributes.
•
Whenever the conceal attribute is set, the character at that location and all other attributes
are temporarily suppressed. Areas that were previously highlighted or blinking no longer
appear highlighted or blink once they have been concealed.
•
If the conceal attribute is accidentally applied to the entire display, it will appear totally
blank. In addition, if the Set Character Attributes Command was used to set the conceal
attribute, sending characters or otherwise changing the contents of the display will have no
visual affect.
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