update_scroll_bar.inc.c

Go to the documentation of this file.

/* The scroll bar's task: once its range and count are set, sizes the thumb,
   then draws it each frame as a white rectangle at the list's place */
void OVL_NAME(updateScrollBar)(ScrollBar *bar) {
    Layer *layer;
    u_long *ot;
    POLY_F4 *poly;
    s32 range;
#if VERSION_US
    s32 pages;
#endif
 
    switch (bar->state) {
    case TASK_INIT:
    default:
        if (bar->hasRange != 0 && bar->hasCount != 0) {
#if VERSION_US
            bar->nextState(bar);
            pages = bar->count / bar->pageSize + (bar->count % bar->pageSize != 0);
            range = (bar->bottom - bar->top) << 8;
            bar->size = range / pages;
            bar->posStep = range / bar->count;
#elif VERSION_EU || VERSION_JP
            /* the European and Japanese versions size the thumb for the visible items */
            range = (bar->bottom - bar->top) << 8;
            bar->size = range / bar->count * bar->pageSize;
            bar->posStep = range / bar->count;
            bar->nextState(bar);
#endif
        }
        break;
    case TASK_RUN:
        layer = GFX.funcs.getLayer(bar->layer);
        ot = layer->getOtEntry(layer, bar->depth);
        poly = GFX.funcs.getPrim();
        if (bar->pos < bar->count - 1) {
            bar->y = bar->top + ((bar->pos * bar->posStep) >> 8);
            if (bar->bottom - (bar->size >> 8) < bar->y) {
                bar->y = bar->bottom - (bar->size >> 8);
            }
        } else {
            bar->y = bar->bottom - (bar->size >> 8);
        }
        setlen(poly, 5);
        poly->code = 0x28;
        poly->r0 = poly->g0 = poly->b0 = 0xFF;
        poly->x0 = poly->x2 = bar->x;
        poly->x1 = poly->x3 = bar->x + bar->width;
        poly->y0 = poly->y1 = bar->y;
        poly->y2 = poly->y3 = bar->y + (bar->size >> 8);
        addPrim(ot, poly);
        GFX.funcs.setPrim(poly + 1);
        break;
    case TASK_DONE:
    case TASK_KILL:
        break;
    }
}