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Implement advanced hit-testing for zoomed images

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This commit is contained in:
Themba Dube 2020-01-04 08:48:51 -05:00
parent 9432622948
commit 23625441a8
1 changed files with 21 additions and 0 deletions
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21
src/lv_objx/lv_img.c
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@ -97,6 +97,7 @@ lv_obj_t * lv_img_create(lv_obj_t * par, const lv_obj_t * copy)
if(copy == NULL) {
lv_obj_set_click(new_img, false);
lv_obj_set_adv_hittest(new_img, true); /*Images have fast hit-testing*/
/* Enable auto size for non screens
* because image screens are wallpapers
* and must be screen sized*/
@ -590,6 +591,26 @@ static lv_res_t lv_img_signal(lv_obj_t * img, lv_signal_t sign, void * param)
lv_coord_t d = ds.i / 2;
img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, d);
}
} else if(sign == LV_SIGNAL_HIT_TEST) {
lv_hit_test_info_t *info = param;
if(ext->zoom != 256 && ext->angle == 0) {
lv_coord_t origin_width = lv_area_get_width(&img->coords);
lv_coord_t origin_height = lv_area_get_height(&img->coords);
lv_coord_t scaled_width = (origin_width * ext->zoom + 255) / 256;
lv_coord_t scaled_height = (origin_height * ext->zoom + 255) / 256;
lv_coord_t width_offset = (origin_width - scaled_width) / 2;
lv_coord_t height_offset = (origin_height - scaled_height) / 2;
lv_area_t coords;
lv_area_copy(&coords, &img->coords);
coords.x1 += width_offset;
coords.x2 -= width_offset;
coords.y1 += height_offset;
coords.y2 -= height_offset;
info->result = lv_area_is_point_on(&coords, info->point, 0);
} else
info->result = lv_obj_is_point_on_coords(img, info->point);
}
return res;