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On 17/05/2008, at 3:16 AM, James Lampert wrote:
I haven't seen _that_ phenomenon exactly, but I _have_ noticed
cases in
which a single program, with a single display file, running on a
_physical_ InfoWindow II, will use dots for some window borders, and
InfoWindow II line draw semigraphics for other window borders. I
wouldn't mind knowing the reason for that, myself.
The ONLY instances I have seen where a terminal (e.g., PC5250 or
InfoWindow II) will not replace the default border with a "graphical"
border are:
1) The DDS specifies different border characters (e.g., reverse-
image spaces)
2) Each line of the window occupies more than one line of the screen
space.
Option 1 is understandable. The developer specifically set the border
so that should be respected.
Option 2 is a little trickier. In order to ensure the window will be
drawn graphically the developer must ensure that the beginning
attribute (i.e., left border) and the ending attribute (i.e., right
border) must be on the same line. That is, the border itself cannot
start in column 1 nor end in the last column of this screen (80 or
132). The attribute bytes can be in these columns but the border
itself cannot.
Mostly this is not an issue because windows are meant to occupy only
part of a screen--notwithstanding the large number of poorly designed
screens I see where so-called windows occupy all the screen. If a
window occupies the entire wall it's no longer a window--it's a glass
wall. Same applies to interfaces.
Before we had proper WINDOW support we used to fake windows using
various DDS keywords. The only way to get a sub-file into one of
those fake windows was to ensure the window occupied the full width
of the screen--but I digress.
In addition to ensuring the window width fits entirely within the
screen width the 5250 data-stream must also indicate that graphical
substitution is allowed. This is done in the Border Presentation
Minor Structure (Bit 0 of Byte 3). DDS takes care of this for most of
us.
Regards,
Simon Coulter.
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