#include <justui/jwidget.h>
#include <justui/jwidget-api.h>
#include <justui/jscrolledlist.h>
#include "util.h"

#include <stdlib.h>

/* Type identifier for jscrolledlist */
static int jscrolledlist_type_id = -1;

jscrolledlist *jscrolledlist_create(void *parent,
    jlist_item_info_function info_function,
    jlist_item_paint_function paint_function)
{
    if(jscrolledlist_type_id < 0)
        return NULL;

    jscrolledlist *l = malloc(sizeof *l);
    if(!l)
        return NULL;

    jwidget_init(&l->widget, jscrolledlist_type_id, parent);
    jwidget_set_stretch(l, 1, 1, false);
    jlayout_set_vbox(l);

    l->frame = jframe_create(l);
    jwidget_set_stretch(l->frame, 1, 1, false);
    jframe_set_align(l->frame, J_ALIGN_LEFT, J_ALIGN_TOP);

    l->list = jlist_create(l->frame, info_function, paint_function);
    jwidget_set_stretch(l->list, 1, 1, false);

    return l;
}

//---
// Polymorphic widget operations
//---

static bool jscrolledlist_poly_event(void *l0, jevent e)
{
    jscrolledlist *l = l0;

    if((e.type == JLIST_SELECTION_MOVED || e.type == JLIST_MODEL_UPDATED)
            && e.source == l->list) {
        int cursor = jlist_selected_item(l->list);
        if(cursor >= 0) {
            jrect r = jlist_selected_region(l->list);
            jframe_scroll_to_region(l->frame, r);
            /* Allow the event to propagate up */
            return false;
        }
    }

    return false;
}

/* jscrolledlist type definition */
static jwidget_poly type_jscrolledlist = {
    .name    = "jscrolledlist",
    .event   = jscrolledlist_poly_event,
};

__attribute__((constructor(1002)))
static void j_register_jscrolledlist(void)
{
    jscrolledlist_type_id = j_register_widget(&type_jscrolledlist, "jwidget");
}