97 lines
3.5 KiB
C
97 lines
3.5 KiB
C
#include "../../lv_examples.h"
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#if LV_USE_ROLLER && LV_DRAW_COMPLEX && LV_BUILD_EXAMPLES
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static void mask_event_cb(lv_event_t * e)
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{
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lv_event_code_t code = lv_event_get_code(e);
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lv_obj_t * obj = lv_event_get_target(e);
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static int16_t mask_top_id = -1;
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static int16_t mask_bottom_id = -1;
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if(code == LV_EVENT_COVER_CHECK) {
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lv_event_set_cover_res(e, LV_COVER_RES_MASKED);
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}
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else if(code == LV_EVENT_DRAW_MAIN_BEGIN) {
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/* add mask */
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const lv_font_t * font = lv_obj_get_style_text_font(obj, LV_PART_MAIN);
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lv_coord_t line_space = lv_obj_get_style_text_line_space(obj, LV_PART_MAIN);
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lv_coord_t font_h = lv_font_get_line_height(font);
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lv_area_t roller_coords;
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lv_obj_get_coords(obj, &roller_coords);
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lv_area_t rect_area;
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rect_area.x1 = roller_coords.x1;
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rect_area.x2 = roller_coords.x2;
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rect_area.y1 = roller_coords.y1;
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rect_area.y2 = roller_coords.y1 + (lv_obj_get_height(obj) - font_h - line_space) / 2;
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lv_draw_mask_fade_param_t * fade_mask_top = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
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lv_draw_mask_fade_init(fade_mask_top, &rect_area, LV_OPA_TRANSP, rect_area.y1, LV_OPA_COVER, rect_area.y2);
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mask_top_id = lv_draw_mask_add(fade_mask_top, NULL);
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rect_area.y1 = rect_area.y2 + font_h + line_space - 1;
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rect_area.y2 = roller_coords.y2;
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lv_draw_mask_fade_param_t * fade_mask_bottom = lv_mem_buf_get(sizeof(lv_draw_mask_fade_param_t));
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lv_draw_mask_fade_init(fade_mask_bottom, &rect_area, LV_OPA_COVER, rect_area.y1, LV_OPA_TRANSP, rect_area.y2);
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mask_bottom_id = lv_draw_mask_add(fade_mask_bottom, NULL);
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}
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else if(code == LV_EVENT_DRAW_POST_END) {
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lv_draw_mask_fade_param_t * fade_mask_top = lv_draw_mask_remove_id(mask_top_id);
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lv_draw_mask_fade_param_t * fade_mask_bottom = lv_draw_mask_remove_id(mask_bottom_id);
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lv_draw_mask_free_param(fade_mask_top);
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lv_draw_mask_free_param(fade_mask_bottom);
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lv_mem_buf_release(fade_mask_top);
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lv_mem_buf_release(fade_mask_bottom);
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mask_top_id = -1;
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mask_bottom_id = -1;
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}
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}
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/**
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* Add a fade mask to roller.
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*/
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void lv_example_roller_3(void)
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{
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static lv_style_t style;
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lv_style_init(&style);
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lv_style_set_bg_color(&style, lv_color_black());
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lv_style_set_text_color(&style, lv_color_white());
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lv_style_set_border_width(&style, 0);
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lv_style_set_pad_all(&style, 0);
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lv_obj_add_style(lv_scr_act(), &style, 0);
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lv_obj_t * roller1 = lv_roller_create(lv_scr_act());
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lv_obj_add_style(roller1, &style, 0);
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lv_obj_set_style_bg_opa(roller1, LV_OPA_TRANSP, LV_PART_SELECTED);
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#if LV_FONT_MONTSERRAT_22
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lv_obj_set_style_text_font(roller1, &lv_font_montserrat_22, LV_PART_SELECTED);
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#endif
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lv_roller_set_options(roller1,
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"January\n"
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"February\n"
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"March\n"
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"April\n"
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"May\n"
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"June\n"
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"July\n"
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"August\n"
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"September\n"
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"October\n"
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"November\n"
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"December",
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LV_ROLLER_MODE_NORMAL);
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lv_obj_center(roller1);
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lv_roller_set_visible_row_count(roller1, 3);
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lv_obj_add_event_cb(roller1, mask_event_cb, LV_EVENT_ALL, NULL);
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}
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#endif
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