sys/curses/menu.c

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#include "crogue.h"

static sint UI_Menu_Hotkey(char key, int numchoices, void (*getchoice)(int N, char *buf));

/*
UI_Menu_Pick parameters:
pos: top-left corner of the window
size: distance from top-left corner to bottom-left corner
numchoices: number of entries on the menu
getchoice: pointer to function taking int N and returning Nth entry on the list
viewonly: zero for normal menu, non-zero for a scrolling text display with no selection

Return codes:
-2 Error
-1 User aborted (no selection)
[0, numchoices): user selection #
*/

static int offset=0;
static int persistence=0;

//{{{
void UI_Menu_Set_Persist(ushort p)
{
    persistence = p;
#ifdef IS_CALCULATOR
    selected = 0;
#endif
    offset = 0;
}
//}}}
//{{{
static sint UI_Menu_Hotkey(char key, int numchoices, void (*getchoice)(int N, char *buf))
{
    char buf[256];
    int i;
    
    for(i=0; i<numchoices; i++)
    {
        getchoice(i, buf);
        if(key == buf[0])
            return i;
    }
    return -1;
}
//}}}

//{{{
static void UI_Menu_Redraw( coord pos, coord size, int numchoices, void (*getchoice)(int N, char *buf), int scrollpos )
{
    int i;
    char outbuf[256];
    char buf[256];
    
    // Draw border
    mvaddch(pos.y,          pos.x,          '+');
    mvaddch(pos.y,          pos.x+size.x-1, '+');
    mvaddch(pos.y+size.y-1, pos.x+size.x-1, '+');
    mvaddch(pos.y+size.y-1, pos.x,          '+');
    for(i=pos.x+1; i<pos.x+size.x-1; i++) {
        mvaddch(pos.y, i, '-');
        mvaddch(pos.y+size.y-1, i, '-');
    }
    for(i=pos.y+1; i<pos.y+size.y-1; i++) {
        mvaddch(i, pos.x, '|');
        mvaddch(i, pos.x+size.x-1, '|');
    }
    
    // Clear interior
    for(i=0; i<size.x-2; i++)
        outbuf[i] = ' ';
    outbuf[i] = '\0';
    for(i=pos.y+1; i<pos.y+size.y-1; i++)
        mvaddstr(i, pos.x+1, outbuf);
    
    // Draw contents
    for(i=0; i<size.y-2; i++) {
        if(i+scrollpos < numchoices) {
            getchoice(i+scrollpos, buf);
            if(buf[0]=='\n')
                sprintf(outbuf, " %s", buf+1);
            else
                sprintf(outbuf, " %c - %s", i+'a', buf);
            draw_string(outbuf, NULL, pos.x+1, i+pos.y+1, SCREEN_WIDTH,
                FontHeight(), 0);
        }
    }
}
//}}}
//{{{
int UI_Menu_Pick( rect r, int numchoices, void (*getchoice)(int N, char *buf), int viewonly )
{
    static int offset=0;
    int in;
    coord pos = r.topleft;
    coord size = r.extent;
    
    if(!persistence) {
        offset= 0;
    } else {
        if(offset>=numchoices)
            offset=0;
    }
    
    do
    {
        UI_Menu_Redraw(pos, size, numchoices, getchoice, offset);
        
        in = read_char();
        
        if(isdigit(in))
            return UI_Menu_Hotkey(in, numchoices, getchoice);
        else if(in==KEY_ESC)
            return -1;
        else if(in==' ' || in=='\n' || in=='>') {
            offset += r.extent.y - 2;;
            if(offset>=numchoices)
                return -1;
        }
        else if(in=='<') {
            offset -= r.extent.y - 2;
            if(offset<0) offset=0;
        }
        else if(islower(in)) {
            if(offset+in-'a' < 0 || offset+in-'a' >= numchoices)
                continue;
            return offset+in-'a';
        }
    }
    while(1);
}
//}}}

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