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List:       ncurses-bug
Subject:    Re: Chgat() Functions Erase Pad Characters
From:       Grady Martin <sunnycemetery () gmail ! com>
Date:       2017-01-09 1:28:58
Message-ID: 20170109012858.GA4178 () creation
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On 2017年01月08日 18時49分, Thomas Dickey wrote:
> The data owned by the pad isn't shared with the standard screen (stdscr)
> 
> The manpage:
> 
> A pad is like a window, except that it is not restricted by the  screen
> size,  and  is not necessarily associated with a particular part of the
> screen.  Pads can be used when a large window is  needed,  and  only  a
> part  of  the  window will be on the screen at one time.  Automatic re-
> 
> The mvchgat updates the standard screen, and the wgetch causes a refresh
> on the standard screen.
> 
> So the updates to the standard screen overwrite the pad.
> 
> Think of it as something like a newwin - making updates and refreshing
> one window will overwrite other windows that it happens to overlap.

Thank you for the insight, especially on a Sunday.

I think my logical course of action is to store "pad" data as cchar_t arrays, \
outputting them with the add_wchstr() family.  (This is not text data; it is a \
scrollable grid of numbers.)

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