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//return an icon (defined by data)
static Evas_Object *_item_content_get(void *data, Evas_Object *obj, const char *part) {
    Evas_Object *icon = elm_icon_add(obj);
    elm_icon_standard_set(icon, data);
    evas_object_show(icon);
    return icon;
}
//select event callback
static void _selected_cb(void *data, Evas_Object *obj, void *event_info) {
    dlog_print(DLOG_INFO, LOG_TAG, "Selected: %p", event_info);
}
//unselect event callback
static void _unselected_cb(void *data, Evas_Object *obj, void *event_info) {
    dlog_print(DLOG_INFO, LOG_TAG, "Unselected: %p", event_info);
}
static void gengrid_test(Evas_Object *parent) {
    Evas_Object *grid = elm_gengrid_add(parent);
    evas_object_size_hint_weight_set(grid, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
    elm_win_resize_object_add(parent, grid);
    evas_object_show(grid);
    elm_gengrid_horizontal_set(grid, EINA_TRUE);
    elm_gengrid_item_size_set(grid, 150, 150);
    Elm_Gengrid_Item_Class *gic;
    gic = elm_gengrid_item_class_new();
    gic->func.content_get = _item_content_get;
    Elm_Object_Item* clock = elm_gengrid_item_append(grid, gic, "clock", NULL, NULL);
    elm_gengrid_item_append(grid, gic, "close", NULL, NULL);
    elm_gengrid_item_append(grid, gic, "apps", NULL, NULL);
    elm_gengrid_item_append(grid, gic, "refresh", NULL, NULL);
    //set callbacks for selected/unselected events
    evas_object_smart_callback_add(grid, "selected", _selected_cb, NULL);
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