LVGL 8.2 menu from a drop-down list

Event handling callback function

static void event_cb(lv_event_t* e)
{
    
    lv_obj_t* dropdown = lv_event_get_target(e); //  Get the object that generated the event 
    char buf[64];
    lv_dropdown_get_selected_str(dropdown, buf, sizeof(buf)); // obtain dropdown Object selection 
    LV_LOG_USER("'%s' is selected", buf); //  Print selection 
}

Create a menu from a drop-down list

/** * Create a menu from a drop-down list and show some drop-down list features and styling */
static void lv_example_dropdown_3(void)
{
    
    /*Create a drop down list*/
    lv_obj_t* dropdown = lv_dropdown_create(lv_scr_act()); //  establish dropdown object 
    lv_obj_align(dropdown, LV_ALIGN_TOP_LEFT, 10, 10); //LV_ALIGN_TOP_LEFT Alignment 
    lv_dropdown_set_options(dropdown, "New project\n"
        "New file\n"
        "Save\n"
        "Save as ...\n"
        "Open project\n"
        "Recent projects\n"
        "Preferences\n"
        "Exit"); //  Set the option content 
    /*Set a fixed text to display on the button of the drop-down list*/
    lv_dropdown_set_text(dropdown, "Menu"); //  Set fixed text Menu
    /*Use a custom image as down icon and flip it when the list is opened*/
    LV_IMG_DECLARE(img_caret_down)   //img_caret_down Picture resource statement 
        lv_dropdown_set_symbol(dropdown, &img_caret_down); //  Set up dropdown Symbol 
    lv_obj_set_style_transform_angle(dropdown, 1800, LV_PART_INDICATOR | LV_STATE_CHECKED); // LV_PART_INDICATOR  and  LV_STATE_CHECKED Property to rotate the picture 180 degree 
    /*In a menu we don't need to show the last clicked item*/
    lv_dropdown_set_selected_highlight(dropdown, false); // Check to turn off highlighting 
    lv_obj_add_event_cb(dropdown, event_cb, LV_EVENT_VALUE_CHANGED, NULL);//dropdown add to LV_EVENT_VALUE_CHANGED Picture piece 
}

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lv_dropdown_set_selected_highlight Function to open the selected item to highlight

 lv_dropdown_set_selected_highlight(dropdown, true); //  set true Turn on the highlight 

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