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