diff --git a/examples/widgets/lv_example_widgets.h b/examples/widgets/lv_example_widgets.h index 08fb72195..526a23bbf 100644 --- a/examples/widgets/lv_example_widgets.h +++ b/examples/widgets/lv_example_widgets.h @@ -95,6 +95,7 @@ void lv_example_obj_2(void); void lv_example_roller_1(void); void lv_example_roller_2(void); +void lv_example_roller_3(void); void lv_example_slider_1(void); void lv_example_slider_2(void); diff --git a/examples/widgets/roller/index.rst b/examples/widgets/roller/index.rst index 3aeac4dbc..791de9c3f 100644 --- a/examples/widgets/roller/index.rst +++ b/examples/widgets/roller/index.rst @@ -13,6 +13,12 @@ Styling the roller .. lv_example:: widgets/roller/lv_example_roller_2 :language: c +add fade mask to roller +""""""""""""""""""""""" + +.. lv_example:: widgets/roller/lv_example_roller_3 + :language: c + MicroPython ^^^^^^^^^^^ diff --git a/examples/widgets/roller/lv_example_roller_3.c b/examples/widgets/roller/lv_example_roller_3.c new file mode 100644 index 000000000..3717a2d6a --- /dev/null +++ b/examples/widgets/roller/lv_example_roller_3.c @@ -0,0 +1,88 @@ +#include "../../lv_examples.h" +#if LV_USE_ROLLER && LV_DRAW_COMPLEX && LV_BUILD_EXAMPLES + +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); + + 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_draw_mask_fade_param_t*)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); + lv_draw_mask_add(fade_mask_top, obj); + + 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_draw_mask_fade_param_t*)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); + lv_draw_mask_add(fade_mask_bottom, obj + 1); + + } else if (code == LV_EVENT_DRAW_POST_END) { + lv_draw_mask_fade_param_t * fade_mask_top = (lv_draw_mask_fade_param_t*)lv_draw_mask_remove_custom(obj); + lv_draw_mask_fade_param_t * fade_mask_bottom = (lv_draw_mask_fade_param_t*)lv_draw_mask_remove_custom(obj + 1); + lv_draw_mask_remove_custom(fade_mask_top); + lv_draw_mask_remove_custom(fade_mask_bottom); + } +} + +/** + * Add an fade mask to roller. + */ +void lv_example_roller_3(void) +{ + static lv_style_t style; + lv_style_init(&style); + lv_style_set_bg_color(&style, lv_color_black()); + lv_style_set_text_color(&style, lv_color_white()); + + 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_border_width(roller1, 0, 0); + lv_obj_set_style_pad_all(roller1, 0, 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, + "January\n" + "February\n" + "March\n" + "April\n" + "May\n" + "June\n" + "July\n" + "August\n" + "September\n" + "October\n" + "November\n" + "December", + LV_ROLLER_MODE_NORMAL); + + lv_obj_center(roller1); + lv_roller_set_visible_row_count(roller1, 3); + lv_obj_add_event_cb(roller1, mask_event_cb, LV_EVENT_ALL, NULL); +} + +#endif