/** * Focus on an object. It ensures that the object will be visible on the page. * @param page pointer to a page object * @param obj pointer to an object to focus (must be on the page) * @param anim_time scroll animation time in milliseconds (0: no animation) */ void lv_page_focus(lv_obj_t * page, lv_obj_t * obj, uint16_t anim_time) { lv_page_ext_t * ext = lv_obj_get_ext_attr(page); lv_style_t * style = lv_page_get_style(page, LV_PAGE_STYLE_BG); lv_style_t * style_scrl = lv_page_get_style(page, LV_PAGE_STYLE_SCRL); lv_coord_t obj_y = obj->coords.y1 - ext->scrl->coords.y1; lv_coord_t obj_h = lv_obj_get_height(obj); lv_coord_t scrlable_y = lv_obj_get_y(ext->scrl); lv_coord_t page_h = lv_obj_get_height(page); lv_coord_t top_err = -(scrlable_y + obj_y); lv_coord_t bot_err = scrlable_y + obj_y + obj_h - page_h; /*If obj is higher then the page focus where the "error" is smaller*/ /*Out of the page on the top*/ if((obj_h <= page_h && top_err > 0) || (obj_h > page_h && top_err < bot_err)) { /*Calculate a new position and let some space above*/ scrlable_y = -(obj_y - style_scrl->body.padding.ver - style->body.padding.ver); scrlable_y += style_scrl->body.padding.ver; } /*Out of the page on the bottom*/ else if((obj_h <= page_h && bot_err > 0) || (obj_h > page_h && top_err >= bot_err)) { /*Calculate a new position and let some space below*/ scrlable_y = -obj_y; scrlable_y += page_h - obj_h; scrlable_y -= style_scrl->body.padding.ver; } else { /*Already in focus*/ return; } if(anim_time == 0) { lv_obj_set_y(ext->scrl, scrlable_y); } else { #if USE_LV_ANIMATION lv_anim_t a; a.act_time = 0; a.start = lv_obj_get_y(ext->scrl); a.end = scrlable_y; a.time = anim_time; a.end_cb = NULL; a.playback = 0; a.repeat = 0; a.var = ext->scrl; a.path = lv_anim_path_linear; a.fp = (lv_anim_fp_t) lv_obj_set_y; lv_anim_create(&a); #endif } }
/** * Refresh the position of the roller. It uses the id stored in: ext->ddlist.selected_option_id * @param roller pointer to a roller object * @param anim_en true: refresh with animation; false: without animation */ static void refr_position(lv_obj_t *roller, bool anim_en) { lv_obj_t *roller_scrl = lv_page_get_scrl(roller); lv_roller_ext_t * ext = lv_obj_get_ext_attr(roller); lv_style_t * style_label = lv_obj_get_style(ext->ddlist.label); const lv_font_t * font = style_label->text.font; lv_coord_t font_h = lv_font_get_height_scale(font); lv_coord_t h = lv_obj_get_height(roller); int32_t id = ext->ddlist.sel_opt_id; lv_coord_t line_y1 = id * (font_h + style_label->text.line_space) + ext->ddlist.label->coords.y1 - roller_scrl->coords.y1; lv_coord_t new_y = - line_y1 + (h - font_h) / 2; if(ext->ddlist.anim_time == 0 || anim_en == false) { lv_obj_set_y(roller_scrl, new_y); } else { #if USE_LV_ANIMATION lv_anim_t a; a.var = roller_scrl; a.start = lv_obj_get_y(roller_scrl); a.end = new_y; a.fp = (lv_anim_fp_t)lv_obj_set_y; a.path = lv_anim_path_linear; a.end_cb = NULL; a.act_time = 0; a.time = ext->ddlist.anim_time; a.playback = 0; a.playback_pause = 0; a.repeat = 0; a.repeat_pause = 0; lv_anim_create(&a); #endif } }
/** * Refresh the position and size of the scroll bars. * @param page pointer to a page object */ static void lv_page_sb_refresh(lv_obj_t * page) { lv_page_ext_t * ext = lv_obj_get_ext_attr(page); lv_style_t * style = lv_obj_get_style(page); lv_obj_t * scrl = ext->scrl; lv_coord_t size_tmp; lv_coord_t scrl_w = lv_obj_get_width(scrl); lv_coord_t scrl_h = lv_obj_get_height(scrl); lv_coord_t hpad = style->body.padding.hor; lv_coord_t vpad = style->body.padding.ver; lv_coord_t obj_w = lv_obj_get_width(page); lv_coord_t obj_h = lv_obj_get_height(page); /*Always let 'scrollbar width' padding above, under, left and right to the scrollbars * else: * - horizontal and vertical scrollbars can overlap on the corners * - if the page has radius the scrollbar can be out of the radius */ lv_coord_t sb_hor_pad = LV_MATH_MAX(ext->sb.style->body.padding.inner, style->body.padding.hor); lv_coord_t sb_ver_pad = LV_MATH_MAX(ext->sb.style->body.padding.inner, style->body.padding.ver); if(ext->sb.mode == LV_SB_MODE_OFF) return; if(ext->sb.mode == LV_SB_MODE_ON) { ext->sb.hor_draw = 1; ext->sb.ver_draw = 1; } /*Invalidate the current (old) scrollbar areas*/ lv_area_t sb_area_tmp; if(ext->sb.hor_draw != 0) { lv_area_copy(&sb_area_tmp, &ext->sb.hor_area); sb_area_tmp.x1 += page->coords.x1; sb_area_tmp.y1 += page->coords.y1; sb_area_tmp.x2 += page->coords.x2; sb_area_tmp.y2 += page->coords.y2; lv_inv_area(&sb_area_tmp); } if(ext->sb.ver_draw != 0) { lv_area_copy(&sb_area_tmp, &ext->sb.ver_area); sb_area_tmp.x1 += page->coords.x1; sb_area_tmp.y1 += page->coords.y1; sb_area_tmp.x2 += page->coords.x2; sb_area_tmp.y2 += page->coords.y2; lv_inv_area(&sb_area_tmp); } if(ext->sb.mode == LV_SB_MODE_DRAG && lv_indev_is_dragging(lv_indev_get_act()) == false) { ext->sb.hor_draw = 0; ext->sb.ver_draw = 0; return; } /*Horizontal scrollbar*/ if(scrl_w <= obj_w - 2 * hpad) { /*Full sized scroll bar*/ lv_area_set_width(&ext->sb.hor_area, obj_w - 2 * sb_hor_pad); lv_area_set_pos(&ext->sb.hor_area, sb_hor_pad, obj_h - ext->sb.style->body.padding.inner - ext->sb.style->body.padding.ver); if(ext->sb.mode == LV_SB_MODE_AUTO || ext->sb.mode == LV_SB_MODE_DRAG) ext->sb.hor_draw = 0; } else { size_tmp = (obj_w * (obj_w - (2 * sb_hor_pad))) / (scrl_w + 2 * hpad); if(size_tmp < LV_PAGE_SB_MIN_SIZE) size_tmp = LV_PAGE_SB_MIN_SIZE; lv_area_set_width(&ext->sb.hor_area, size_tmp); lv_area_set_pos(&ext->sb.hor_area, sb_hor_pad + (-(lv_obj_get_x(scrl) - hpad) * (obj_w - size_tmp - 2 * sb_hor_pad)) / (scrl_w + 2 * hpad - obj_w ), obj_h - ext->sb.style->body.padding.inner - ext->sb.style->body.padding.ver); if(ext->sb.mode == LV_SB_MODE_AUTO || ext->sb.mode == LV_SB_MODE_DRAG) ext->sb.hor_draw = 1; } /*Vertical scrollbar*/ if(scrl_h <= obj_h - 2 * vpad) { /*Full sized scroll bar*/ lv_area_set_height(&ext->sb.ver_area, obj_h - 2 * sb_ver_pad); lv_area_set_pos(&ext->sb.ver_area, obj_w - ext->sb.style->body.padding.inner - ext->sb.style->body.padding.hor, sb_ver_pad); if(ext->sb.mode == LV_SB_MODE_AUTO || ext->sb.mode == LV_SB_MODE_DRAG) ext->sb.ver_draw = 0; } else { size_tmp = (obj_h * (obj_h - (2 * sb_ver_pad))) / (scrl_h + 2 * vpad); if(size_tmp < LV_PAGE_SB_MIN_SIZE) size_tmp = LV_PAGE_SB_MIN_SIZE; lv_area_set_height(&ext->sb.ver_area, size_tmp); lv_area_set_pos(&ext->sb.ver_area, obj_w - ext->sb.style->body.padding.inner - ext->sb.style->body.padding.hor, sb_ver_pad + (-(lv_obj_get_y(scrl) - vpad) * (obj_h - size_tmp - 2 * sb_ver_pad)) / (scrl_h + 2 * vpad - obj_h )); if(ext->sb.mode == LV_SB_MODE_AUTO || ext->sb.mode == LV_SB_MODE_DRAG) ext->sb.ver_draw = 1; } /*Invalidate the new scrollbar areas*/ if(ext->sb.hor_draw != 0) { lv_area_copy(&sb_area_tmp, &ext->sb.hor_area); sb_area_tmp.x1 += page->coords.x1; sb_area_tmp.y1 += page->coords.y1; sb_area_tmp.x2 += page->coords.x2; sb_area_tmp.y2 += page->coords.y2; lv_inv_area(&sb_area_tmp); } if(ext->sb.ver_draw != 0) { lv_area_copy(&sb_area_tmp, &ext->sb.ver_area); sb_area_tmp.x1 += page->coords.x1; sb_area_tmp.y1 += page->coords.y1; sb_area_tmp.x2 += page->coords.x2; sb_area_tmp.y2 += page->coords.y2; lv_inv_area(&sb_area_tmp); } }
/** * Signal function of the scrollable part of a page * @param scrl pointer to the scrollable object * @param sign a signal type from lv_signal_t enum * @param param pointer to a signal specific variable * @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted */ static lv_res_t lv_page_scrollable_signal(lv_obj_t * scrl, lv_signal_t sign, void * param) { lv_res_t res; /* Include the ancient signal function */ res = ancestor_signal(scrl, sign, param); if(res != LV_RES_OK) return res; lv_obj_t * page = lv_obj_get_parent(scrl); lv_style_t * page_style = lv_obj_get_style(page); lv_page_ext_t * page_ext = lv_obj_get_ext_attr(page); if(sign == LV_SIGNAL_CORD_CHG) { /*Be sure the width of the scrollable is correct*/ if(lv_cont_get_hor_fit(scrl) == false) { lv_obj_set_width(scrl, lv_obj_get_width(page) - 2 * page_style->body.padding.hor); } /*Limit the position of the scrollable object to be always visible * (Do not let its edge inner then its parent respective edge)*/ lv_coord_t new_x; lv_coord_t new_y; bool refr_x = false; bool refr_y = false; lv_area_t page_cords; lv_area_t scrl_cords; lv_coord_t hpad = page_style->body.padding.hor; lv_coord_t vpad = page_style->body.padding.ver; new_x = lv_obj_get_x(scrl); new_y = lv_obj_get_y(scrl); lv_obj_get_coords(scrl, &scrl_cords); lv_obj_get_coords(page, &page_cords); /*scrollable width smaller then page width? -> align to left*/ if(lv_area_get_width(&scrl_cords) + 2 * hpad < lv_area_get_width(&page_cords)) { if(scrl_cords.x1 != page_cords.x1 + hpad) { new_x = hpad; refr_x = true; } } else { /*The edges of the scrollable can not be in the page (minus hpad) */ if(scrl_cords.x2 < page_cords.x2 - hpad) { new_x = lv_area_get_width(&page_cords) - lv_area_get_width(&scrl_cords) - hpad; /* Right align */ refr_x = true; } if (scrl_cords.x1 > page_cords.x1 + hpad) { new_x = hpad; /*Left align*/ refr_x = true; } } /*scrollable height smaller then page height? -> align to left*/ if(lv_area_get_height(&scrl_cords) + 2 * vpad < lv_area_get_height(&page_cords)) { if(scrl_cords.y1 != page_cords.y1 + vpad) { new_y = vpad; refr_y = true; } } else { /*The edges of the scrollable can not be in the page (minus vpad) */ if(scrl_cords.y2 < page_cords.y2 - vpad) { new_y = lv_area_get_height(&page_cords) - lv_area_get_height(&scrl_cords) - vpad; /* Bottom align */ refr_y = true; } if (scrl_cords.y1 > page_cords.y1 + vpad) { new_y = vpad; /*Top align*/ refr_y = true; } } if(refr_x != false || refr_y != false) { lv_obj_set_pos(scrl, new_x, new_y); } lv_page_sb_refresh(page); } else if(sign == LV_SIGNAL_DRAG_END) { /*Hide scrollbars if required*/ if(page_ext->sb.mode == LV_SB_MODE_DRAG) { lv_area_t sb_area_tmp; if(page_ext->sb.hor_draw) { lv_area_copy(&sb_area_tmp, &page_ext->sb.hor_area); sb_area_tmp.x1 += page->coords.x1; sb_area_tmp.y1 += page->coords.y1; sb_area_tmp.x2 += page->coords.x2; sb_area_tmp.y2 += page->coords.y2; lv_inv_area(&sb_area_tmp); page_ext->sb.hor_draw = 0; } if(page_ext->sb.ver_draw) { lv_area_copy(&sb_area_tmp, &page_ext->sb.ver_area); sb_area_tmp.x1 += page->coords.x1; sb_area_tmp.y1 += page->coords.y1; sb_area_tmp.x2 += page->coords.x2; sb_area_tmp.y2 += page->coords.y2; lv_inv_area(&sb_area_tmp); page_ext->sb.ver_draw = 0; } } } else if(sign == LV_SIGNAL_PRESSED) { if(page_ext->pr_action != NULL) { page_ext->pr_action(page); } } else if(sign == LV_SIGNAL_RELEASED) { if(lv_indev_is_dragging(lv_indev_get_act()) == false) { if(page_ext->rel_action != NULL) { page_ext->rel_action(page); } } } return res; }