Re: zcurses scrolling

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

On 11/17/2015 09:34 AM, Ray Andrews wrote:
> All:
>
> I'm experimenting with mouse input and getting strange results with 
> the scrolling wheel. If I grab input like this:
No advice on my troubles with zcurses gentlemen?  I've come up with this 
hack:


n_get_key () # Capture keystroke or mouse action:
{
    # Clear input buffer, doing this here reduces typeahead :-)
    MSG=  # New keystroke will erase old MSG.
    NKEY= # NB, must do this, or ^C goes strange when searching.
    MOUSE=()
    zcurses timeout status 0        # Need this, or first keystrokes 
disappear.
    zcurses input status key keypad # w.o. this, typeahead is much worse.
    zcurses timeout status -1       # This is essential.
    typeset -g _flag
    local key= keypad= mouse=
    zcurses input status key keypad mouse

    # Get the "keypad" key or regular key:
    NKEY="$key"
    [ -z "$NKEY" ] && NKEY="$keypad"
    [ -z "$NKEY" ] &&
        { n_status_msg "Improper input detected"; zcurses refresh status }

    MOUSE[X]="${mouse[2]}"
    MOUSE[Y]="${mouse[3]}"
    MOUSE[!]="${mouse[5]}"

    if [ "$NKEY" = 'MOUSE' ]; then
        if [ "$MOUSE[!]" = 'PRESSED4' ]; then NKEY='UP'; MOUSE[!]=
        elif [ -z "$MOUSE[!]" ] && [ "$_flag" != '1' ]; then
            NKEY='DOWN'; MOUSE[!]=
        # Otherwise a slow click becomes a 'DOWN'!!
        elif [ -n "$MOUSE[!]" ]; then
            if [ "$MOUSE[!]" = 'PRESSED1' ]; then _flag=1; else _flag=0; fi
        fi
    fi
}

I've restored the scroll wheel's output to UP and DOWN so that no 
special handling is needed, and I can capture mouse clicks, but there's 
a gotcha: If your click timing is not perfect, then you get a click and 
a DOWN thrown in as a bonus.  The above more or less works, but should 
it be necessary?  Should not up-scrolling and down-scrolling be handled 
the same way?  In the SRC there's code for 'PRESSED5' which I guessed 
might be down-scrolling, but it won't compile if defined and it's 
commented as being only available in 64 bits.  But could it really be 
the case that we can't handle down-scrolling in 32 bits?  Hard to believe.

"zcurses mouse 500" gave me a segmentation fault.