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Continuing work on “nano-curses”

2010/06/16

As part of the progression on my main contract (which has another rev of PCB’s and parts on their way), I’m diving back into my “nano-curses” project.  I’ve got the basic operations on stdscr working, including a semi-smart refresh() algorithm (it moves the cursor after any gap in changed characters, rather than any gap bigger than the size of the move-cursor command itself).  Now I’m figuring out how to do subwindows and scrolling, as those are the features that made me look to using curses in the first place.  The biggest problem is untangling the actual intended operation of the various functions and arguments.  For instance, when creating a subwindow, the documentation says nothing about what happens if the x,y,width,height places any of the window outside the parent window.  I have to dive into ncurses code in order to determine that such a situation is an error condition, and should fail to allocate the subwindow at all.  I  don’t yet have the faintest idea what’s supposed to happen in regards to refresh()ing the stdscr when a subwindow has been scrolled.  A naive form would just internally scroll the screen buffer and leave it to the refresh() algorithm to redraw it all.  However, that completely ignores the ability of the “physical” terminal to do subwindow scrolling.  I’m still tracking down how ncurses keeps track of child windows…

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