acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
lv_example_roller_3.c (3538B)
      1 #include "../../lv_examples.h"
      2 #if LV_USE_ROLLER && LV_DRAW_COMPLEX && LV_BUILD_EXAMPLES
      3 
      4 static void mask_event_cb(lv_event_t * e)
      5 {
      6     lv_event_code_t code = lv_event_get_code(e);
      7     lv_obj_t * obj = lv_event_get_target(e);
      8 
      9     static int16_t mask_top_id = -1;
     10     static int16_t mask_bottom_id = -1;
     11 
     12     if(code == LV_EVENT_COVER_CHECK) {
     13         lv_event_set_cover_res(e, LV_COVER_RES_MASKED);
     14 
     15     }
     16     else if(code == LV_EVENT_DRAW_MAIN_BEGIN) {
     17         /* add mask */
     18         const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
     19         lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
     20         lv_coord_t font_h = lv_font_get_line_height(font);
     21 
     22         lv_area_t roller_coords;
     23         lv_obj_get_coords(obj, &roller_coords);
     24 
     25         lv_area_t rect_area;
     26         rect_area.x1 = roller_coords.x1;
     27         rect_area.x2 = roller_coords.x2;
     28         rect_area.y1 = roller_coords.y1;
     29         rect_area.y2 = roller_coords.y1 + (lv_obj_get_height(obj) - font_h - line_space) / 2;
     30 
     31         lv_draw_mask_fade_param_t * fade_mask_top = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
     32         lv_draw_mask_fade_init(fade_mask_top, &rect_area, LV_OPA_TRANSP, rect_area.y1, LV_OPA_COVER, rect_area.y2);
     33         mask_top_id = lv_draw_mask_add(fade_mask_top, NULL);
     34 
     35         rect_area.y1 = rect_area.y2 + font_h + line_space - 1;
     36         rect_area.y2 = roller_coords.y2;
     37 
     38         lv_draw_mask_fade_param_t * fade_mask_bottom = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
     39         lv_draw_mask_fade_init(fade_mask_bottom, &rect_area, LV_OPA_COVER, rect_area.y1, LV_OPA_TRANSP, rect_area.y2);
     40         mask_bottom_id = lv_draw_mask_add(fade_mask_bottom, NULL);
     41 
     42     }
     43     else if(code == LV_EVENT_DRAW_POST_END) {
     44         lv_draw_mask_fade_param_t * fade_mask_top = lv_draw_mask_remove_id(mask_top_id);
     45         lv_draw_mask_fade_param_t * fade_mask_bottom = lv_draw_mask_remove_id(mask_bottom_id);
     46         lv_draw_mask_free_param(fade_mask_top);
     47         lv_draw_mask_free_param(fade_mask_bottom);
     48         lv_mem_buf_release(fade_mask_top);
     49         lv_mem_buf_release(fade_mask_bottom);
     50         mask_top_id = -1;
     51         mask_bottom_id = -1;
     52     }
     53 }
     54 
     55 /**
     56  * Add a fade mask to roller.
     57  */
     58 void lv_example_roller_3(void)
     59 {
     60     static lv_style_t style;
     61     lv_style_init(&style);
     62     lv_style_set_bg_color(&style, lv_color_black());
     63     lv_style_set_text_color(&style, lv_color_white());
     64     lv_style_set_border_width(&style, 0);
     65     lv_style_set_pad_all(&style, 0);
     66     lv_obj_add_style(lv_scr_act(), &style, 0);
     67 
     68     lv_obj_t * roller1 = lv_roller_create(lv_scr_act());
     69     lv_obj_add_style(roller1, &style, 0);
     70     lv_obj_set_style_bg_opa(roller1, LV_OPA_TRANSP, LV_PART_SELECTED);
     71 
     72 #if LV_FONT_MONTSERRAT_22
     73     lv_obj_set_style_text_font(roller1, &lv_font_montserrat_22, LV_PART_SELECTED);
     74 #endif
     75 
     76     lv_roller_set_options(roller1,
     77                           "January\n"
     78                           "February\n"
     79                           "March\n"
     80                           "April\n"
     81                           "May\n"
     82                           "June\n"
     83                           "July\n"
     84                           "August\n"
     85                           "September\n"
     86                           "October\n"
     87                           "November\n"
     88                           "December",
     89                           LV_ROLLER_MODE_NORMAL);
     90 
     91     lv_obj_center(roller1);
     92     lv_roller_set_visible_row_count(roller1, 3);
     93     lv_obj_add_event_cb(roller1, mask_event_cb, LV_EVENT_ALL, NULL);
     94 }
     95 
     96 #endif