/** * @file lv_roller.c * */ /********************* * INCLUDES *********************/ #include "lv_conf.h" #if USE_LV_ROLLER != 0 #include "lv_roller.h" #include "../lv_draw/lv_draw.h" /********************* * DEFINES *********************/ /********************** * TYPEDEFS **********************/ /********************** * STATIC PROTOTYPES **********************/ static bool lv_roller_design(lv_obj_t * roller, const area_t * mask, lv_design_mode_t mode); static bool roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param); /********************** * STATIC VARIABLES **********************/ static lv_signal_f_t ancestor_scr_signal_f; /********************** * MACROS **********************/ /********************** * GLOBAL FUNCTIONS **********************/ /*----------------- * Create function *-----------------*/ /** * Create a roller object * @param par pointer to an object, it will be the parent of the new roller * @param copy pointer to a roller object, if not NULL then the new object will be copied from it * @return pointer to the created roller */ lv_obj_t * lv_roller_create(lv_obj_t * par, lv_obj_t * copy) { /*Create the ancestor of roller*/ lv_obj_t * new_roller = lv_ddlist_create(par, copy); dm_assert(new_roller); /*Allocate the roller type specific extended data*/ lv_roller_ext_t * ext = lv_obj_alloc_ext(new_roller, sizeof(lv_roller_ext_t)); dm_assert(ext); /*Initialize the allocated 'ext' */ /*The signal and design functions are not copied so set them here*/ lv_obj_set_signal_f(new_roller, lv_roller_signal); lv_obj_set_design_f(new_roller, lv_roller_design); if(ancestor_scr_signal_f == NULL) ancestor_scr_signal_f = lv_obj_get_signal_f(lv_page_get_scrl(new_roller)); /*Init the new roller roller*/ if(copy == NULL) { lv_obj_t * scrl = lv_page_get_scrl(new_roller); lv_obj_set_drag(scrl, true); /*In ddlist is might be disabled*/ lv_page_set_rel_action(new_roller, NULL); /*Handle roller specific actions*/ lv_cont_set_fit(lv_page_get_scrl(new_roller), true, false); /*Height is specified directly*/ lv_obj_set_signal_f(scrl, roller_scrl_signal); lv_ddlist_open(new_roller, true, 0); lv_style_t * style_label = lv_obj_get_style(ext->ddlist.opt_label); lv_ddlist_set_fix_height(new_roller, (font_get_height(style_label->font) >> FONT_ANTIALIAS) * 3 + style_label->line_space * 4); lv_obj_refr_style(new_roller); /*To set scrollable size automatically*/ } /*Copy an existing roller*/ else { lv_roller_ext_t * copy_ext = lv_obj_get_ext(copy); /*Refresh the style with new signal function*/ lv_obj_refr_style(new_roller); } return new_roller; } /** * Signal function of the roller * @param roller pointer to a roller object * @param sign a signal type from lv_signal_t enum * @param param pointer to a signal specific variable * @return true: the object is still valid (not deleted), false: the object become invalid */ bool lv_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * param) { bool valid; /* Include the ancient signal function */ valid = lv_ddlist_signal(roller, sign, param); /* The object can be deleted so check its validity and then * make the object specific signal handling */ if(valid != false) { lv_roller_ext_t * ext = lv_obj_get_ext(roller); if(sign == LV_SIGNAL_STYLE_CHG) { lv_obj_set_height(lv_page_get_scrl(roller), lv_obj_get_height(ext->ddlist.opt_label) + lv_obj_get_height(roller)); lv_obj_align(ext->ddlist.opt_label, NULL, LV_ALIGN_CENTER, 0, 0); lv_ddlist_set_selected(roller, ext->ddlist.sel_opt); } else if(sign == LV_SIGNAL_CORD_CHG) { lv_ddlist_set_fix_height(roller, lv_obj_get_height(roller)); lv_obj_set_height(lv_page_get_scrl(roller), lv_obj_get_height(ext->ddlist.opt_label) + lv_obj_get_height(roller)); lv_obj_align(ext->ddlist.opt_label, NULL, LV_ALIGN_CENTER, 0, 0); lv_ddlist_set_selected(roller, ext->ddlist.sel_opt); } } return valid; } /*====================== * Add/remove functions *=====================*/ /* * New object specific "add" or "remove" functions come here */ /*===================== * Setter functions *====================*/ /* * New object specific "set" functions come here */ /*===================== * Getter functions *====================*/ /* * New object specific "get" functions come here */ /*===================== * Other functions *====================*/ /* * New object specific "other" functions come here */ /********************** * STATIC FUNCTIONS **********************/ /** * Handle the drawing related tasks of the rollers * @param roller pointer to an object * @param mask the object will be drawn only in this area * @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area * (return 'true' if yes) * LV_DESIGN_DRAW: draw the object (always return 'true') * LV_DESIGN_DRAW_POST: drawing after every children are drawn * @param return true/false, depends on 'mode' */ static bool lv_roller_design(lv_obj_t * roller, const area_t * mask, lv_design_mode_t mode) { /*Return false if the object is not covers the mask_p area*/ if(mode == LV_DESIGN_COVER_CHK) { return false; } /*Draw the object*/ else if(mode == LV_DESIGN_DRAW_MAIN) { lv_style_t * style = lv_obj_get_style(roller); lv_draw_rect(&roller->cords, mask, style); const font_t * font = style->font; lv_roller_ext_t * ext = lv_obj_get_ext(roller); cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS; area_t rect_area; rect_area.y1 = roller->cords.y1 + lv_obj_get_height(roller) / 2 - font_h / 2 - style->line_space - 2; rect_area.y2 = rect_area.y1 + font_h + style->line_space; rect_area.x1 = ext->ddlist.opt_label->cords.x1 - style->hpad; rect_area.x2 = rect_area.x1 + lv_obj_get_width(lv_page_get_scrl(roller)); lv_draw_rect(&rect_area, mask, ext->ddlist.style_sel); } /*Post draw when the children are drawn*/ else if(mode == LV_DESIGN_DRAW_POST) { } return true; } /** * Signal function of the scrollable part of the roller. * @param roller_scrl ointer to the scrollable part of roller (page) * @param sign a signal type from lv_signal_t enum * @param param pointer to a signal specific variable * @return true: the object is still valid (not deleted), false: the object become invalid */ static bool roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign, void * param) { bool valid; /* Include the ancient signal function */ valid = ancestor_scr_signal_f(roller_scrl, sign, param); /* The object can be deleted so check its validity and then * make the object specific signal handling */ if(valid != false) { int32_t id = -1; lv_obj_t * roller = lv_obj_get_parent(roller_scrl); lv_roller_ext_t * ext = lv_obj_get_ext(roller); lv_style_t * style_label = lv_obj_get_style(ext->ddlist.opt_label); const font_t * font = style_label->font; cord_t font_h = font_get_height(font) >> FONT_ANTIALIAS; if(sign == LV_SIGNAL_DRAG_END) { /*If dragged then align the list to there be an element in the middle*/ cord_t label_y1 = ext->ddlist.opt_label->cords.y1 - roller->cords.y1; cord_t label_unit = (font_get_height(style_label->font) >> FONT_ANTIALIAS) + style_label->line_space / 2; cord_t mid = (roller->cords.y2 - roller->cords.y1) / 2; id = (mid - label_y1) / label_unit;if(id < 0) id = 0; if(id < 0) id = 0; if(id >= ext->ddlist.num_opt) id = ext->ddlist.num_opt - 1; ext->ddlist.sel_opt = id; } else if(sign == LV_SIGNAL_RELEASED) { /*If picked an option by clicking then set it*/ if(!lv_dispi_is_dragging(param)) { point_t p; lv_dispi_get_point(param, &p); p.y = p.y - ext->ddlist.opt_label->cords.y1; id = p.y / (font_h + style_label->line_space); if(id < 0) id = 0; if(id >= ext->ddlist.num_opt) id = ext->ddlist.num_opt - 1; ext->ddlist.sel_opt = id; } } /*Position the scrollable according to the new selected option*/ if(id != -1) { cord_t h = lv_obj_get_height(roller); cord_t line_y1 = id * (font_h + style_label->line_space) + ext->ddlist.opt_label->cords.y1 - roller_scrl->cords.y1; cord_t new_y = - line_y1 + (h - font_h) / 2; if(ext->ddlist.anim_time == 0) { lv_obj_set_y(roller_scrl, new_y); } else { anim_t a; a.var = roller_scrl; a.start = lv_obj_get_y(roller_scrl); a.end = new_y; a.fp = (anim_fp_t)lv_obj_set_y; a.path = anim_get_path(ANIM_PATH_LIN); 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; anim_create(&a); } } } return valid; } #endif