LVGL Switch ＆ Table

Simple Switch

static void event_handler(lv_event_t* e)
{
    
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t* obj = lv_event_get_target(e);
    if (code == LV_EVENT_VALUE_CHANGED) {
    
        LV_LOG_USER("State: %s\n", lv_obj_has_state(obj, LV_STATE_CHECKED) ? "On" :"Off");
    }
}

static void lv_example_switch_1(void)
{
    
    lv_obj_set_flex_flow(lv_scr_act(), LV_FLEX_FLOW_COLUMN);
    lv_obj_set_flex_align(lv_scr_act(), LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
    lv_obj_t* sw;
    sw = lv_switch_create(lv_scr_act());
    lv_obj_add_event_cb(sw, event_handler, LV_EVENT_ALL, NULL);
    sw = lv_switch_create(lv_scr_act());
    lv_obj_add_state(sw, LV_STATE_CHECKED);
    lv_obj_add_event_cb(sw, event_handler, LV_EVENT_ALL, NULL);
    sw = lv_switch_create(lv_scr_act());
    lv_obj_add_state(sw, LV_STATE_DISABLED);
    lv_obj_add_event_cb(sw, event_handler, LV_EVENT_ALL, NULL);
    sw = lv_switch_create(lv_scr_act());
    lv_obj_add_state(sw, LV_STATE_CHECKED | LV_STATE_DISABLED);
    lv_obj_add_event_cb(sw, event_handler, LV_EVENT_ALL, NULL);
}

• Running effect
  

Simple table

static void draw_part_event_cb(lv_event_t* e)
{
    
    lv_obj_t* obj = lv_event_get_target(e);
    lv_obj_draw_part_dsc_t* dsc = lv_event_get_param(e);
    /*If the cells are drawn...*/
    if (dsc->part == LV_PART_ITEMS) {
    
        uint32_t row = dsc->id / lv_table_get_col_cnt(obj);
        uint32_t col = dsc->id - row * lv_table_get_col_cnt(obj);
        /*Make the texts in the first cell center aligned*/
        if (row == 0) {
    
            dsc->label_dsc->align = LV_TEXT_ALIGN_CENTER;
            dsc->rect_dsc->bg_color = lv_color_mix(lv_palette_main(LV_PALETTE_BLUE), dsc->rect_dsc->bg_color, LV_OPA_20);
            dsc->rect_dsc->bg_opa = LV_OPA_COVER;
        }
        /*In the first column align the texts to the right*/
        else if (col == 0) {
    
            dsc->label_dsc->align = LV_TEXT_ALIGN_RIGHT;
        }
        /*MAke every 2nd row grayish*/
        if ((row != 0 && row % 2) == 0) {
    
            dsc->rect_dsc->bg_color = lv_color_mix(lv_palette_main(LV_PALETTE_GREY), dsc->rect_dsc->bg_color, LV_OPA_10);
            dsc->rect_dsc->bg_opa = LV_OPA_COVER;
        }
    }
}

static void lv_example_table_1(void)
{
    
    lv_obj_t* table = lv_table_create(lv_scr_act());
    /*Fill the first column*/
    lv_table_set_cell_value(table, 0, 0, "Name");
    lv_table_set_cell_value(table, 1, 0, "Apple");
    lv_table_set_cell_value(table, 2, 0, "Banana");
    lv_table_set_cell_value(table, 3, 0, "Lemon");
    lv_table_set_cell_value(table, 4, 0, "Grape");
    lv_table_set_cell_value(table, 5, 0, "Melon");
    lv_table_set_cell_value(table, 6, 0, "Peach");
    lv_table_set_cell_value(table, 7, 0, "Nuts");
    /*Fill the second column*/
    lv_table_set_cell_value(table, 0, 1, "Price");
    lv_table_set_cell_value(table, 1, 1, "$7");
    lv_table_set_cell_value(table, 2, 1, "$4");
    lv_table_set_cell_value(table, 3, 1, "$6");
    lv_table_set_cell_value(table, 4, 1, "$2");
    lv_table_set_cell_value(table, 5, 1, "$5");
    lv_table_set_cell_value(table, 6, 1, "$1");
    lv_table_set_cell_value(table, 7, 1, "$9");
    /*Set a smaller height to the table. It'll make it scrollable*/
    lv_obj_set_height(table, 200);
    lv_obj_center(table);
    /*Add an event callback to to apply some custom drawing*/
    lv_obj_add_event_cb(table, draw_part_event_cb, LV_EVENT_DRAW_PART_BEGIN, NULL);
}

• Running effect
  

Lightweighted list from table

#define ITEM_CNT 200
static void draw_event_cb(lv_event_t* e)
{
    
    lv_obj_t* obj = lv_event_get_target(e);
    lv_obj_draw_part_dsc_t* dsc = lv_event_get_draw_part_dsc(e);
    /*If the cells are drawn...*/
    if (dsc->part == LV_PART_ITEMS){
    
        bool chk = lv_table_has_cell_ctrl(obj, dsc->id, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
    lv_draw_rect_dsc_t rect_dsc;
    lv_draw_rect_dsc_init(&rect_dsc);
    rect_dsc.bg_color = chk ? lv_theme_get_color_primary(obj) : lv_palette_lighten(LV_PALETTE_GREY, 2);
    rect_dsc.radius = LV_RADIUS_CIRCLE;
    lv_area_t sw_area;
    sw_area.x1 = dsc->draw_area->x2 - 50;
    sw_area.x2 = sw_area.x1 + 40;
    sw_area.y1 = dsc->draw_area->y1 + lv_area_get_height(dsc->draw_area) / 2 - 10;
    sw_area.y2 = sw_area.y1 + 20;
    lv_draw_rect(dsc->draw_ctx, &rect_dsc, &sw_area);
    rect_dsc.bg_color = lv_color_white();
    if (chk) {
    
        sw_area.x2 -= 2;
        sw_area.x1 = sw_area.x2 - 16;
    }
    else {
    
        sw_area.x1 += 2;
        sw_area.x2 = sw_area.x1 + 16;
    }
    sw_area.y1 += 2;
    sw_area.y2 -= 2;
    lv_draw_rect(dsc->draw_ctx, &rect_dsc, &sw_area);
}
}

static void change_event_cb(lv_event_t* e)
{
    
    lv_obj_t* obj = lv_event_get_target(e);
    uint16_t col;
    uint16_t row;
    lv_table_get_selected_cell(obj, &row, &col);
    bool chk = lv_table_has_cell_ctrl(obj, row, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
    if (chk) lv_table_clear_cell_ctrl(obj, row, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
    else lv_table_add_cell_ctrl(obj, row, 0, LV_TABLE_CELL_CTRL_CUSTOM_1);
}

static void lv_example_table_2(void)
{
    
    /*Measure memory usage*/
    lv_mem_monitor_t mon1;
    lv_mem_monitor(&mon1);
    uint32_t t = lv_tick_get();
    lv_obj_t* table = lv_table_create(lv_scr_act());
    /*Set a smaller height to the table. It'll make it scrollable*/
    lv_obj_set_size(table, LV_SIZE_CONTENT, 200);
    lv_table_set_col_width(table, 0, 150);
    lv_table_set_row_cnt(table, ITEM_CNT); /*Not required but avoids a lot of memory reallocation lv_table_set_set_value*/
    lv_table_set_col_cnt(table, 1);
    /*Don't make the cell pressed, we will draw something different in the event*/
    lv_obj_remove_style(table, NULL, LV_PART_ITEMS | LV_STATE_PRESSED);
    uint32_t i;
    for (i = 0; i < ITEM_CNT; i++) {
    
        lv_table_set_cell_value_fmt(table, i, 0, "Item %"LV_PRIu32, i + 1);
    }
    lv_obj_align(table, LV_ALIGN_CENTER, 0, -20);
    /*Add an event callback to to apply some custom drawing*/
    lv_obj_add_event_cb(table, draw_event_cb, LV_EVENT_DRAW_PART_END, NULL);
    lv_obj_add_event_cb(table, change_event_cb, LV_EVENT_VALUE_CHANGED, NULL);
    lv_mem_monitor_t mon2;
    lv_mem_monitor(&mon2);
    uint32_t mem_used = mon1.free_size - mon2.free_size;
    uint32_t elaps = lv_tick_elaps(t);
    lv_obj_t* label = lv_label_create(lv_scr_act());
    lv_label_set_text_fmt(label, "%"LV_PRIu32" items were created in %"LV_PRIu32" ms\n"
        "using %"LV_PRIu32" bytes of memory",
        ITEM_CNT, elaps, mem_used);
    lv_obj_align(label, LV_ALIGN_BOTTOM_MID, 0, -10);
}

• Running effect