Roller example 3

How-to
1

How to fix an error in roller_3 example when moved C code to arduino IDE

invalid conversion from ‘void*’ to ‘lv_draw_mask_fade_param_t*’ [-fpermissive]

Thank you

2

Hi,

I’d love to help but cant tell what your code looks like. Can you post your example?

Thanks!

3

static void mask_event_cb(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_target(e);

static int16_t mask_top_id = -1;
static int16_t mask_bottom_id = -1;

if(code == LV_EVENT_COVER_CHECK) {
    lv_event_set_cover_res(e, LV_COVER_RES_MASKED);

}
else if(code == LV_EVENT_DRAW_MAIN_BEGIN) {
    // add mask 
    const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
    lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
    lv_coord_t font_h = lv_font_get_line_height(font);

    lv_area_t roller_coords;
    lv_obj_get_coords(obj, &roller_coords);

    lv_area_t rect_area;
    rect_area.x1 = roller_coords.x1;
    rect_area.x2 = roller_coords.x2;
    rect_area.y1 = roller_coords.y1;
    rect_area.y2 = roller_coords.y1 + (lv_obj_get_height(obj) - font_h - line_space) / 2;

    lv_draw_mask_fade_param_t * fade_mask_top = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
    lv_draw_mask_fade_init(fade_mask_top, &rect_area, LV_OPA_TRANSP, rect_area.y1, LV_OPA_COVER, rect_area.y2);
    mask_top_id = lv_draw_mask_add(fade_mask_top, NULL);

    rect_area.y1 = rect_area.y2 + font_h + line_space - 1;
    rect_area.y2 = roller_coords.y2;

    lv_draw_mask_fade_param_t * fade_mask_bottom = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
    lv_draw_mask_fade_init(fade_mask_bottom, &rect_area, LV_OPA_COVER, rect_area.y1, LV_OPA_TRANSP, rect_area.y2);
    mask_bottom_id = lv_draw_mask_add(fade_mask_bottom, NULL);

}
else if(code == LV_EVENT_DRAW_POST_END) {
    lv_draw_mask_fade_param_t * fade_mask_top = lv_draw_mask_remove_id(mask_top_id);
    lv_draw_mask_fade_param_t * fade_mask_bottom = lv_draw_mask_remove_id(mask_bottom_id);
    lv_draw_mask_free_param(fade_mask_top);
    lv_draw_mask_free_param(fade_mask_bottom);
    lv_mem_buf_release(fade_mask_top);
    lv_mem_buf_release(fade_mask_bottom);
    mask_top_id = -1;
    mask_bottom_id = -1;
}

}

//Add a fade mask to roller.

void roller_3(void)
{
static lv_style_t style;
lv_style_init(&style);
lv_style_set_bg_color(&style,lv_color_hex(0x1f272a));
lv_style_set_text_color(&style, lv_color_white());

lv_style_set_border_width(&style, 0);
lv_style_set_pad_all(&style, 0);
lv_obj_add_style(lv_scr_act(), &style, 0);

lv_obj_t * roller1 = lv_roller_create(lv_scr_act());
lv_obj_add_style(roller1, &style, 0);
lv_obj_set_style_bg_opa(roller1, LV_OPA_TRANSP, LV_PART_SELECTED);

#if LV_FONT_MONTSERRAT_22
lv_obj_set_style_text_font(roller1, &lv_font_montserrat_22, LV_PART_SELECTED);
#endif

lv_roller_set_options(roller1,
                      "  10 % \n"
                      "  20 % \n"
                      "  30 % \n"
                      "  40 % \n"
                      "  50 % \n"
                      "  60 % \n"
                      "  70 % \n"
                      "  80 % \n"
                      "  90 % \n"
                      "  100 % ",
                      
                      
                      LV_ROLLER_MODE_NORMAL);

//lv_obj_center(roller1);
lv_obj_set_pos(roller1, 50, 120);
lv_roller_set_visible_row_count(roller1, 3);
//lv_obj_add_event_cb(roller1, mask_event_cb, LV_EVENT_ALL, NULL);

}