521 lines
18 KiB
C
521 lines
18 KiB
C
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/**
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* @file lv_slider.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_slider.h"
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#if USE_LV_SLIDER != 0
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#include "../lv_core/lv_group.h"
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#include "../lv_draw/lv_draw.h"
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#include "../lv_themes/lv_theme.h"
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#include "../lv_misc/lv_math.h"
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/*********************
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* DEFINES
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*********************/
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#define LV_SLIDER_SIZE_MIN 4 /*hor. pad and ver. pad cannot make the bar or indicator smaller then this [px]*/
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#define LV_SLIDER_NOT_PRESSED INT16_MIN
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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_slider_design(lv_obj_t * slider, const lv_area_t * mask, lv_design_mode_t mode);
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static lv_res_t lv_slider_signal(lv_obj_t * slider, 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_design_func_t ancestor_design_f;
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static lv_signal_func_t ancestor_signal;
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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 a slider objects
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* @param par pointer to an object, it will be the parent of the new slider
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* @param copy pointer to a slider object, if not NULL then the new object will be copied from it
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* @return pointer to the created slider
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*/
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lv_obj_t * lv_slider_create(lv_obj_t * par, const lv_obj_t * copy)
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{
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LV_LOG_TRACE("slider create started");
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/*Create the ancestor slider*/
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lv_obj_t * new_slider = lv_bar_create(par, copy);
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lv_mem_assert(new_slider);
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if(new_slider == NULL) return NULL;
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if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_func(new_slider);
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if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_slider);
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/*Allocate the slider type specific extended data*/
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lv_slider_ext_t * ext = lv_obj_allocate_ext_attr(new_slider, sizeof(lv_slider_ext_t));
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lv_mem_assert(ext);
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if(ext == NULL) return NULL;
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/*Initialize the allocated 'ext' */
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ext->action = NULL;
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ext->drag_value = LV_SLIDER_NOT_PRESSED;
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ext->style_knob = &lv_style_pretty;
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ext->knob_in = 0;
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/*The signal and design functions are not copied so set them here*/
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lv_obj_set_signal_func(new_slider, lv_slider_signal);
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lv_obj_set_design_func(new_slider, lv_slider_design);
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/*Init the new slider slider*/
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if(copy == NULL) {
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lv_obj_set_click(new_slider, true);
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lv_obj_set_protect(new_slider, LV_PROTECT_PRESS_LOST);
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/*Set the default styles*/
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lv_theme_t * th = lv_theme_get_current();
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if(th) {
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lv_slider_set_style(new_slider, LV_SLIDER_STYLE_BG, th->slider.bg);
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lv_slider_set_style(new_slider, LV_SLIDER_STYLE_INDIC, th->slider.indic);
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lv_slider_set_style(new_slider, LV_SLIDER_STYLE_KNOB, th->slider.knob);
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} else {
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lv_slider_set_style(new_slider, LV_SLIDER_STYLE_KNOB, ext->style_knob);
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}
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}
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/*Copy an existing slider*/
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else {
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lv_slider_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
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ext->style_knob = copy_ext->style_knob;
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ext->action = copy_ext->action;
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ext->knob_in = copy_ext->knob_in;
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/*Refresh the style with new signal function*/
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lv_obj_refresh_style(new_slider);
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}
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LV_LOG_INFO("slider created");
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return new_slider;
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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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* Set a function which will be called when a new value is set on the slider
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* @param slider pointer to slider object
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* @param action a callback function
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*/
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void lv_slider_set_action(lv_obj_t * slider, lv_action_t action)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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ext->action = action;
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}
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/**
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* Set the 'knob in' attribute of a slider
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* @param slider pointer to slider object
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* @param in true: the knob is drawn always in the slider;
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* false: the knob can be out on the edges
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*/
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void lv_slider_set_knob_in(lv_obj_t * slider, bool in)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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if(ext->knob_in == in) return;
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ext->knob_in = in == false ? 0 : 1;
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lv_obj_invalidate(slider);
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}
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/**
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* Set a style of a slider
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* @param slider pointer to a slider object
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* @param type which style should be set
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* @param style pointer to a style
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*/
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void lv_slider_set_style(lv_obj_t * slider, lv_slider_style_t type, lv_style_t * style)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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switch(type) {
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case LV_SLIDER_STYLE_BG:
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lv_bar_set_style(slider, LV_BAR_STYLE_BG, style);
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break;
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case LV_SLIDER_STYLE_INDIC:
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lv_bar_set_style(slider, LV_BAR_STYLE_INDIC, style);
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break;
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case LV_SLIDER_STYLE_KNOB:
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ext->style_knob = style;
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lv_obj_refresh_ext_size(slider);
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break;
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}
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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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* Get the value of a slider
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* @param slider pointer to a slider object
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* @return the value of the slider
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*/
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int16_t lv_slider_get_value(const lv_obj_t * slider)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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if(ext->drag_value != LV_SLIDER_NOT_PRESSED) return ext->drag_value;
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else return lv_bar_get_value(slider);
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}
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/**
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* Get the slider action function
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* @param slider pointer to slider object
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* @return the callback function
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*/
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lv_action_t lv_slider_get_action(const lv_obj_t * slider)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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return ext->action;
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}
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/**
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* Give the slider is being dragged or not
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* @param slider pointer to a slider object
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* @return true: drag in progress false: not dragged
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*/
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bool lv_slider_is_dragged(const lv_obj_t * slider)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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return ext->drag_value == LV_SLIDER_NOT_PRESSED ? false : true;
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}
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/**
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* Get the 'knob in' attribute of a slider
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* @param slider pointer to slider object
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* @return true: the knob is drawn always in the slider;
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* false: the knob can be out on the edges
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*/
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bool lv_slider_get_knob_in(const lv_obj_t * slider)
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{
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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return ext->knob_in == 0 ? false : true;
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}
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/**
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* Get a style of a slider
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* @param slider pointer to a slider object
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* @param type which style should be get
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* @return style pointer to a style
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*/
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lv_style_t * lv_slider_get_style(const lv_obj_t * slider, lv_slider_style_t type)
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{
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lv_style_t * style = NULL;
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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switch(type) {
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case LV_SLIDER_STYLE_BG:
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style = lv_bar_get_style(slider, LV_BAR_STYLE_BG);
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break;
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case LV_SLIDER_STYLE_INDIC:
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style = lv_bar_get_style(slider, LV_BAR_STYLE_INDIC);
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break;
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case LV_SLIDER_STYLE_KNOB:
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style = ext->style_knob;
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break;
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default:
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style = NULL;
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break;
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}
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return style;
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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 sliders
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* @param slider 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_slider_design(lv_obj_t * slider, const lv_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_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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lv_style_t * style_bg = lv_slider_get_style(slider, LV_SLIDER_STYLE_BG);
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lv_style_t * style_knob = lv_slider_get_style(slider, LV_SLIDER_STYLE_KNOB);
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lv_style_t * style_indic = lv_slider_get_style(slider, LV_SLIDER_STYLE_INDIC);
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lv_opa_t opa_scale = lv_obj_get_opa_scale(slider);
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lv_coord_t slider_w = lv_area_get_width(&slider->coords);
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lv_coord_t slider_h = lv_area_get_height(&slider->coords);
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/*Draw the bar*/
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lv_area_t area_bg;
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lv_area_copy(&area_bg, &slider->coords);
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/*Be sure at least LV_SLIDER_SIZE_MIN size will remain*/
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lv_coord_t pad_ver_bg = style_bg->body.padding.ver;
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lv_coord_t pad_hor_bg = style_bg->body.padding.hor;
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if(pad_ver_bg * 2 + LV_SLIDER_SIZE_MIN > lv_area_get_height(&area_bg)) {
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pad_ver_bg = (lv_area_get_height(&area_bg) - LV_SLIDER_SIZE_MIN) >> 1;
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}
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if(pad_hor_bg * 2 + LV_SLIDER_SIZE_MIN > lv_area_get_width(&area_bg)) {
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pad_hor_bg = (lv_area_get_width(&area_bg) - LV_SLIDER_SIZE_MIN) >> 1;
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}
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if(ext->knob_in) { /*Enable extra size if the knob is inside */
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area_bg.x1 += pad_hor_bg;
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area_bg.x2 -= pad_hor_bg;
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area_bg.y1 += pad_hor_bg;
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area_bg.y2 -= pad_hor_bg;
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} else { /*Let space only in the perpendicular directions*/
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area_bg.x1 += slider_w < slider_h ? pad_hor_bg : 0; /*Pad only for vertical slider*/
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area_bg.x2 -= slider_w < slider_h ? pad_hor_bg : 0; /*Pad only for vertical slider*/
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area_bg.y1 += slider_w > slider_h ? pad_ver_bg : 0; /*Pad only for horizontal slider*/
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area_bg.y2 -= slider_w > slider_h ? pad_ver_bg : 0; /*Pad only for horizontal slider*/
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}
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#if USE_LV_GROUP == 0
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lv_draw_rect(&area_bg, mask, style_bg, lv_obj_get_opa_scale(slider));
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#else
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/* Draw the borders later if the bar is focused.
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* At value = 100% the indicator can cover to whole background and the focused style won't be visible*/
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if(lv_obj_is_focused(slider)) {
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lv_style_t style_tmp;
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lv_style_copy(&style_tmp, style_bg);
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style_tmp.body.border.width = 0;
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lv_draw_rect(&area_bg, mask, &style_tmp, opa_scale);
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} else {
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lv_draw_rect(&area_bg, mask, style_bg, opa_scale);
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}
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#endif
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/*Draw the indicator*/
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lv_area_t area_indic;
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lv_area_copy(&area_indic, &area_bg);
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/*Be sure at least ver pad/hor pad width indicator will remain*/
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lv_coord_t pad_ver_indic = style_indic->body.padding.ver;
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lv_coord_t pad_hor_indic = style_indic->body.padding.hor;
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if(pad_ver_indic * 2 + LV_SLIDER_SIZE_MIN > lv_area_get_height(&area_bg)) {
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pad_ver_indic = (lv_area_get_height(&area_bg) - LV_SLIDER_SIZE_MIN) >> 1;
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}
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if(pad_hor_indic * 2 + LV_SLIDER_SIZE_MIN > lv_area_get_width(&area_bg)) {
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pad_hor_indic = (lv_area_get_width(&area_bg) - LV_SLIDER_SIZE_MIN) >> 1;
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}
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area_indic.x1 += pad_hor_indic;
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area_indic.x2 -= pad_hor_indic;
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area_indic.y1 += pad_ver_indic;
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area_indic.y2 -= pad_ver_indic;
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lv_coord_t cur_value = lv_slider_get_value(slider);
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lv_coord_t min_value = lv_slider_get_min_value(slider);
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lv_coord_t max_value = lv_slider_get_max_value(slider);
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/*If dragged draw to the drag position*/
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if(ext->drag_value != LV_SLIDER_NOT_PRESSED) cur_value = ext->drag_value;
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if(slider_w >= slider_h) {
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area_indic.x2 = (int32_t)((int32_t)(lv_area_get_width(&area_indic)) * (cur_value - min_value)) / (max_value - min_value);
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area_indic.x2 = area_indic.x1 + area_indic.x2 - 1;
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} else {
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area_indic.y1 = (int32_t)((int32_t)(lv_area_get_height(&area_indic)) * (cur_value - min_value)) / (max_value - min_value);
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area_indic.y1 = area_indic.y2 - area_indic.y1 + 1;
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}
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if(cur_value != min_value) lv_draw_rect(&area_indic, mask, style_indic, opa_scale);
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/*Before the knob add the border if required*/
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#if USE_LV_GROUP
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/* Draw the borders later if the bar is focused.
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* At value = 100% the indicator can cover to whole background and the focused style won't be visible*/
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if(lv_obj_is_focused(slider)) {
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lv_style_t style_tmp;
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lv_style_copy(&style_tmp, style_bg);
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style_tmp.body.empty = 1;
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style_tmp.body.shadow.width = 0;
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lv_draw_rect(&area_bg, mask, &style_tmp, opa_scale);
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}
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#endif
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/*Draw the knob*/
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lv_area_t knob_area;
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lv_area_copy(&knob_area, &slider->coords);
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if(slider_w >= slider_h) {
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if(ext->knob_in == 0) {
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knob_area.x1 = area_indic.x2 - slider_h / 2;
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knob_area.x2 = knob_area.x1 + slider_h - 1;
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} else {
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knob_area.x1 = (int32_t)((int32_t)(slider_w - slider_h - 1) * (cur_value - min_value)) / (max_value - min_value);
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knob_area.x1 += slider->coords.x1;
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knob_area.x2 = knob_area.x1 + slider_h - 1;
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}
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knob_area.y1 = slider->coords.y1;
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knob_area.y2 = slider->coords.y2;
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} else {
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if(ext->knob_in == 0) {
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knob_area.y1 = area_indic.y1 - slider_w / 2;
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knob_area.y2 = knob_area.y1 + slider_w - 1;
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} else {
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knob_area.y2 = (int32_t)((int32_t)(slider_h - slider_w - 1) * (cur_value - min_value)) / (max_value - min_value);
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knob_area.y2 = slider->coords.y2 - knob_area.y2;
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knob_area.y1 = knob_area.y2 - slider_w - 1;
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}
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knob_area.x1 = slider->coords.x1;
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knob_area.x2 = slider->coords.x2;
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}
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lv_draw_rect(&knob_area, mask, style_knob, opa_scale);
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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 slider
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* @param slider pointer to a slider 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 LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
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*/
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static lv_res_t lv_slider_signal(lv_obj_t * slider, lv_signal_t sign, void * param)
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{
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lv_res_t res;
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/* Include the ancient signal function */
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res = ancestor_signal(slider, sign, param);
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if(res != LV_RES_OK) return res;
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lv_slider_ext_t * ext = lv_obj_get_ext_attr(slider);
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lv_point_t p;
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lv_coord_t w = lv_obj_get_width(slider);
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lv_coord_t h = lv_obj_get_height(slider);
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if(sign == LV_SIGNAL_PRESSED) {
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ext->drag_value = lv_slider_get_value(slider);
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} else if(sign == LV_SIGNAL_PRESSING) {
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lv_indev_get_point(param, &p);
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int16_t tmp = 0;
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if(w > h) {
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lv_coord_t knob_w = h;
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p.x -= slider->coords.x1 + h / 2; /*Modify the point to shift with half knob (important on the start and end)*/
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tmp = (int32_t)((int32_t) p.x * (ext->bar.max_value - ext->bar.min_value + 1)) / (w - knob_w);
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tmp += ext->bar.min_value;
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} else {
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lv_coord_t knob_h = w;
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p.y -= slider->coords.y1 + w / 2; /*Modify the point to shift with half knob (important on the start and end)*/
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|
tmp = (int32_t)((int32_t) p.y * (ext->bar.max_value - ext->bar.min_value + 1)) / (h - knob_h);
|
|
tmp = ext->bar.max_value - tmp; /*Invert the value: smaller value means higher y*/
|
|
}
|
|
|
|
if(tmp < ext->bar.min_value) tmp = ext->bar.min_value;
|
|
else if(tmp > ext->bar.max_value) tmp = ext->bar.max_value;
|
|
|
|
if(tmp != ext->drag_value) {
|
|
ext->drag_value = tmp;
|
|
lv_obj_invalidate(slider);
|
|
if(ext->action != NULL) res = ext->action(slider);
|
|
}
|
|
} else if(sign == LV_SIGNAL_RELEASED || sign == LV_SIGNAL_PRESS_LOST) {
|
|
lv_slider_set_value(slider, ext->drag_value);
|
|
ext->drag_value = LV_SLIDER_NOT_PRESSED;
|
|
if(ext->action != NULL) res = ext->action(slider);
|
|
} else if(sign == LV_SIGNAL_CORD_CHG) {
|
|
/* The knob size depends on slider size.
|
|
* During the drawing method the ext. size is used by the knob so refresh the ext. size.*/
|
|
if(lv_obj_get_width(slider) != lv_area_get_width(param) ||
|
|
lv_obj_get_height(slider) != lv_area_get_height(param)) {
|
|
slider->signal_func(slider, LV_SIGNAL_REFR_EXT_SIZE, NULL);
|
|
}
|
|
} else if(sign == LV_SIGNAL_REFR_EXT_SIZE) {
|
|
lv_style_t * style = lv_slider_get_style(slider, LV_SLIDER_STYLE_BG);
|
|
lv_style_t * knob_style = lv_slider_get_style(slider, LV_SLIDER_STYLE_KNOB);
|
|
lv_coord_t shadow_w = knob_style->body.shadow.width;
|
|
if(ext->knob_in == 0) {
|
|
/* The smaller size is the knob diameter*/
|
|
lv_coord_t x = LV_MATH_MIN(w / 2 + 1 + shadow_w, h / 2 + 1 + shadow_w);
|
|
if(slider->ext_size < x) slider->ext_size = x;
|
|
} else {
|
|
lv_coord_t pad = LV_MATH_MIN(style->body.padding.hor, style->body.padding.ver);
|
|
if(pad < 0) pad = -pad;
|
|
if(slider->ext_size < pad) slider->ext_size = pad;
|
|
|
|
if(slider->ext_size < shadow_w) slider->ext_size = shadow_w;
|
|
}
|
|
} else if(sign == LV_SIGNAL_CONTROLL) {
|
|
char c = *((char *)param);
|
|
|
|
ext->drag_value = LV_SLIDER_NOT_PRESSED;
|
|
|
|
#if USE_LV_GROUP
|
|
lv_group_t * g = lv_obj_get_group(slider);
|
|
bool editing = lv_group_get_editing(g);
|
|
lv_hal_indev_type_t indev_type = lv_indev_get_type(lv_indev_get_act());
|
|
/*Encoders need special handling*/
|
|
if(indev_type == LV_INDEV_TYPE_ENCODER && c == LV_GROUP_KEY_ENTER) {
|
|
if(editing) lv_group_set_editing(g, false);
|
|
}
|
|
#endif
|
|
if(c == LV_GROUP_KEY_RIGHT || c == LV_GROUP_KEY_UP) {
|
|
lv_slider_set_value(slider, lv_slider_get_value(slider) + 1);
|
|
if(ext->action != NULL) res = ext->action(slider);
|
|
} else if(c == LV_GROUP_KEY_LEFT || c == LV_GROUP_KEY_DOWN) {
|
|
lv_slider_set_value(slider, lv_slider_get_value(slider) - 1);
|
|
if(ext->action != NULL) res = ext->action(slider);
|
|
}
|
|
} else if(sign == LV_SIGNAL_GET_EDITABLE) {
|
|
bool * editable = (bool *)param;
|
|
*editable = true;
|
|
} else if(sign == LV_SIGNAL_GET_TYPE) {
|
|
lv_obj_type_t * buf = param;
|
|
uint8_t i;
|
|
for(i = 0; i < LV_MAX_ANCESTOR_NUM - 1; i++) { /*Find the last set data*/
|
|
if(buf->type[i] == NULL) break;
|
|
}
|
|
buf->type[i] = "lv_slider";
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif
|