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lvgl/src/widgets/slider/lv_slider.c
Gabor Kiss-Vamosi 70879191a1 feat(slider): add orientation support (based on bar)
2024-12-04 11:48:51 +01:00

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/**
* @file lv_slider.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_slider_private.h"
#include "../../misc/lv_area_private.h"
#include "../../core/lv_obj_private.h"
#include "../../core/lv_obj_event_private.h"
#include "../../core/lv_obj_class_private.h"
#if LV_USE_SLIDER != 0
#include "../../misc/lv_assert.h"
#include "../../core/lv_group.h"
#include "../../indev/lv_indev.h"
#include "../../indev/lv_indev_private.h"
#include "../../display/lv_display.h"
#include "../../draw/lv_draw.h"
#include "../../stdlib/lv_string.h"
#include "../../misc/lv_math.h"
#include "../image/lv_image.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS (&lv_slider_class)
#define LV_SLIDER_KNOB_COORD(is_reversed, area) (is_reversed ? area.x1 : area.x2)
#define LV_SLIDER_KNOB_COORD_VERTICAL(is_reversed, area) (is_reversed ? area.y2 : area.y1)
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_slider_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_slider_event(const lv_obj_class_t * class_p, lv_event_t * e);
static void position_knob(lv_obj_t * obj, lv_area_t * knob_area, const int32_t knob_size, const bool hor);
static void draw_knob(lv_event_t * e);
static bool is_slider_horizontal(lv_obj_t * obj);
static void drag_start(lv_obj_t * obj);
static void update_knob_pos(lv_obj_t * obj, bool check_drag);
/**********************
* STATIC VARIABLES
**********************/
const lv_obj_class_t lv_slider_class = {
.constructor_cb = lv_slider_constructor,
.event_cb = lv_slider_event,
.editable = LV_OBJ_CLASS_EDITABLE_TRUE,
.group_def = LV_OBJ_CLASS_GROUP_DEF_TRUE,
.instance_size = sizeof(lv_slider_t),
.base_class = &lv_bar_class,
.name = "slider",
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_obj_t * lv_slider_create(lv_obj_t * parent)
{
LV_LOG_INFO("begin");
lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
lv_obj_class_init_obj(obj);
return obj;
}
bool lv_slider_is_dragged(const lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_slider_t * slider = (lv_slider_t *)obj;
return slider->dragging;
}
void lv_slider_set_value(lv_obj_t * obj, int32_t value, lv_anim_enable_t anim)
{
lv_bar_set_value(obj, value, anim);
}
void lv_slider_set_left_value(lv_obj_t * obj, int32_t value, lv_anim_enable_t anim)
{
lv_bar_set_start_value(obj, value, anim);
}
void lv_slider_set_range(lv_obj_t * obj, int32_t min, int32_t max)
{
lv_bar_set_range(obj, min, max);
}
void lv_slider_set_mode(lv_obj_t * obj, lv_slider_mode_t mode)
{
lv_bar_set_mode(obj, (lv_bar_mode_t)mode);
}
void lv_slider_set_orientation(lv_obj_t * obj, lv_slider_orientation_t orientation)
{
lv_bar_set_orientation(obj, (lv_bar_orientation_t)orientation);
}
int32_t lv_slider_get_value(const lv_obj_t * obj)
{
return lv_bar_get_value(obj);
}
int32_t lv_slider_get_left_value(const lv_obj_t * obj)
{
return lv_bar_get_start_value(obj);
}
int32_t lv_slider_get_min_value(const lv_obj_t * obj)
{
return lv_bar_get_min_value(obj);
}
int32_t lv_slider_get_max_value(const lv_obj_t * obj)
{
return lv_bar_get_max_value(obj);
}
lv_slider_mode_t lv_slider_get_mode(lv_obj_t * slider)
{
lv_bar_mode_t mode = lv_bar_get_mode(slider);
if(mode == LV_BAR_MODE_SYMMETRICAL) return LV_SLIDER_MODE_SYMMETRICAL;
else if(mode == LV_BAR_MODE_RANGE) return LV_SLIDER_MODE_RANGE;
else return LV_SLIDER_MODE_NORMAL;
}
lv_slider_orientation_t lv_slider_get_orientation(lv_obj_t * slider)
{
lv_bar_orientation_t ori = lv_bar_get_orientation(slider);
if(ori == LV_BAR_ORIENTATION_HORIZONTAL) return LV_SLIDER_ORIENTATION_HORIZONTAL;
else if(ori == LV_BAR_ORIENTATION_VERTICAL) return LV_SLIDER_ORIENTATION_VERTICAL;
else return LV_SLIDER_ORIENTATION_AUTO;
}
bool lv_slider_is_symmetrical(lv_obj_t * obj)
{
return lv_bar_is_symmetrical(obj);
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_slider_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
lv_slider_t * slider = (lv_slider_t *)obj;
/*Initialize the allocated 'slider'*/
slider->value_to_set = NULL;
slider->dragging = 0U;
slider->left_knob_focus = 0U;
lv_obj_remove_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_HOR);
lv_obj_remove_flag(obj, LV_OBJ_FLAG_SCROLLABLE);
lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
lv_obj_set_ext_click_area(obj, LV_DPX(8));
}
static void lv_slider_event(const lv_obj_class_t * class_p, lv_event_t * e)
{
LV_UNUSED(class_p);
lv_result_t res;
/*Call the ancestor's event handler*/
res = lv_obj_event_base(MY_CLASS, e);
if(res != LV_RESULT_OK) return;
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = lv_event_get_current_target(e);
lv_slider_t * slider = (lv_slider_t *)obj;
lv_slider_mode_t type = lv_slider_get_mode(obj);
/*Advanced hit testing: react only on dragging the knob(s)*/
if(code == LV_EVENT_HIT_TEST) {
lv_hit_test_info_t * info = lv_event_get_param(e);
int32_t ext_click_area = obj->spec_attr ? obj->spec_attr->ext_click_pad : 0;
/*Ordinary slider: was the knob area hit?*/
lv_area_t a;
lv_area_copy(&a, &slider->right_knob_area);
lv_area_increase(&a, ext_click_area, ext_click_area);
info->res = lv_area_is_point_on(&a, info->point, 0);
/*There's still a chance that there is a hit if there is another knob*/
if((info->res == false) && (type == LV_SLIDER_MODE_RANGE)) {
lv_area_copy(&a, &slider->left_knob_area);
lv_area_increase(&a, ext_click_area, ext_click_area);
info->res = lv_area_is_point_on(&a, info->point, 0);
}
}
else if(code == LV_EVENT_PRESSED) {
/*Save the pressed coordinates*/
lv_indev_get_point(lv_indev_active(), &slider->pressed_point);
lv_obj_transform_point(obj, &slider->pressed_point, LV_OBJ_POINT_TRANSFORM_FLAG_INVERSE_RECURSIVE);
}
else if(code == LV_EVENT_PRESSING) {
update_knob_pos(obj, true);
}
else if(code == LV_EVENT_RELEASED || code == LV_EVENT_PRESS_LOST) {
update_knob_pos(obj, false);
slider->dragging = false;
slider->value_to_set = NULL;
lv_obj_invalidate(obj);
/*Leave edit mode if released. (No need to wait for LONG_PRESS)*/
lv_group_t * g = lv_obj_get_group(obj);
bool editing = lv_group_get_editing(g);
lv_indev_type_t indev_type = lv_indev_get_type(lv_indev_active());
if(indev_type == LV_INDEV_TYPE_ENCODER) {
if(editing) {
if(lv_slider_get_mode(obj) == LV_SLIDER_MODE_RANGE) {
if(slider->left_knob_focus == 0) slider->left_knob_focus = 1;
else {
slider->left_knob_focus = 0;
lv_group_set_editing(g, false);
}
}
else {
lv_group_set_editing(g, false);
}
}
}
else if(indev_type == LV_INDEV_TYPE_POINTER) {
if(is_slider_horizontal(obj)) lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_VER);
else lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_HOR);
}
}
else if(code == LV_EVENT_FOCUSED) {
lv_indev_type_t indev_type = lv_indev_get_type(lv_indev_active());
if(indev_type == LV_INDEV_TYPE_ENCODER || indev_type == LV_INDEV_TYPE_KEYPAD) {
slider->left_knob_focus = 0;
}
}
else if(code == LV_EVENT_SIZE_CHANGED) {
if(is_slider_horizontal(obj)) {
lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_VER);
lv_obj_remove_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_HOR);
}
else {
lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_HOR);
lv_obj_remove_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_VER);
}
lv_obj_refresh_ext_draw_size(obj);
}
else if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
int32_t knob_left = lv_obj_get_style_pad_left(obj, LV_PART_KNOB);
int32_t knob_right = lv_obj_get_style_pad_right(obj, LV_PART_KNOB);
int32_t knob_top = lv_obj_get_style_pad_top(obj, LV_PART_KNOB);
int32_t knob_bottom = lv_obj_get_style_pad_bottom(obj, LV_PART_KNOB);
/*The smaller size is the knob diameter*/
int32_t trans_w = lv_obj_get_style_transform_width(obj, LV_PART_KNOB);
int32_t trans_h = lv_obj_get_style_transform_height(obj, LV_PART_KNOB);
int32_t knob_size = LV_MIN(lv_obj_get_width(obj) + 2 * trans_w, lv_obj_get_height(obj) + 2 * trans_h) >> 1;
knob_size += LV_MAX(LV_MAX(knob_left, knob_right), LV_MAX(knob_bottom, knob_top));
knob_size += 2; /*For rounding error*/
knob_size += lv_obj_calculate_ext_draw_size(obj, LV_PART_KNOB);
/*Indic. size is handled by bar*/
int32_t * s = lv_event_get_param(e);
*s = LV_MAX(*s, knob_size);
}
else if(code == LV_EVENT_KEY) {
uint32_t c = lv_event_get_key(e);
if(c == LV_KEY_RIGHT || c == LV_KEY_UP) {
if(!slider->left_knob_focus) lv_slider_set_value(obj, lv_slider_get_value(obj) + 1, LV_ANIM_ON);
else lv_slider_set_left_value(obj, lv_slider_get_left_value(obj) + 1, LV_ANIM_ON);
}
else if(c == LV_KEY_LEFT || c == LV_KEY_DOWN) {
if(!slider->left_knob_focus) lv_slider_set_value(obj, lv_slider_get_value(obj) - 1, LV_ANIM_ON);
else lv_slider_set_left_value(obj, lv_slider_get_left_value(obj) - 1, LV_ANIM_ON);
}
else {
return;
}
res = lv_obj_send_event(obj, LV_EVENT_VALUE_CHANGED, NULL);
if(res != LV_RESULT_OK) return;
}
else if(code == LV_EVENT_ROTARY) {
int32_t r = lv_event_get_rotary_diff(e);
if(!slider->left_knob_focus) lv_slider_set_value(obj, lv_slider_get_value(obj) + r, LV_ANIM_ON);
else lv_slider_set_left_value(obj, lv_slider_get_left_value(obj) + 1, LV_ANIM_ON);
res = lv_obj_send_event(obj, LV_EVENT_VALUE_CHANGED, NULL);
if(res != LV_RESULT_OK) return;
}
else if(code == LV_EVENT_DRAW_MAIN) {
draw_knob(e);
}
}
static void draw_knob(lv_event_t * e)
{
lv_obj_t * obj = lv_event_get_current_target(e);
lv_slider_t * slider = (lv_slider_t *)obj;
lv_layer_t * layer = lv_event_get_layer(e);
const bool is_rtl = LV_BASE_DIR_RTL == lv_obj_get_style_base_dir(obj, LV_PART_MAIN);
const bool is_horizontal = is_slider_horizontal(obj);
const bool is_reversed = slider->bar.val_reversed ^ (is_rtl && is_horizontal);
lv_area_t knob_area;
int32_t knob_size;
bool is_symmetrical = lv_slider_is_symmetrical(obj);
if(is_horizontal) {
knob_size = lv_obj_get_height(obj);
if(is_symmetrical &&
slider->bar.cur_value < 0) knob_area.x1 = LV_SLIDER_KNOB_COORD(!is_reversed, slider->bar.indic_area);
else knob_area.x1 = LV_SLIDER_KNOB_COORD(is_reversed, slider->bar.indic_area);
}
else {
knob_size = lv_obj_get_width(obj);
if(is_symmetrical &&
slider->bar.cur_value < 0) knob_area.y1 = LV_SLIDER_KNOB_COORD_VERTICAL(!is_reversed, slider->bar.indic_area);
else knob_area.y1 = LV_SLIDER_KNOB_COORD_VERTICAL(is_reversed, slider->bar.indic_area);
}
lv_draw_rect_dsc_t knob_rect_dsc;
lv_draw_rect_dsc_init(&knob_rect_dsc);
lv_obj_init_draw_rect_dsc(obj, LV_PART_KNOB, &knob_rect_dsc);
/* Update knob area with knob style */
position_knob(obj, &knob_area, knob_size, is_horizontal);
/* Update right knob area with calculated knob area */
lv_area_copy(&slider->right_knob_area, &knob_area);
if(lv_slider_get_mode(obj) != LV_SLIDER_MODE_RANGE) {
lv_draw_rect(layer, &knob_rect_dsc, &slider->right_knob_area);
}
else {
/*Save the draw part_draw_dsc. because it can be modified in the event*/
lv_draw_rect_dsc_t knob_rect_dsc_tmp;
lv_memcpy(&knob_rect_dsc_tmp, &knob_rect_dsc, sizeof(lv_draw_rect_dsc_t));
/* Draw the right knob */
lv_draw_rect(layer, &knob_rect_dsc, &slider->right_knob_area);
/*Calculate the second knob area*/
if(is_horizontal) {
/*use !is_reversed to get the other knob*/
knob_area.x1 = LV_SLIDER_KNOB_COORD(!is_reversed, slider->bar.indic_area);
}
else {
knob_area.y1 = LV_SLIDER_KNOB_COORD_VERTICAL(!is_reversed, slider->bar.indic_area);
}
position_knob(obj, &knob_area, knob_size, is_horizontal);
lv_area_copy(&slider->left_knob_area, &knob_area);
lv_memcpy(&knob_rect_dsc, &knob_rect_dsc_tmp, sizeof(lv_draw_rect_dsc_t));
lv_draw_rect(layer, &knob_rect_dsc, &slider->left_knob_area);
}
}
static void position_knob(lv_obj_t * obj, lv_area_t * knob_area, const int32_t knob_size, const bool hor)
{
if(hor) {
knob_area->x1 -= (knob_size >> 1);
knob_area->x2 = knob_area->x1 + knob_size - 1;
knob_area->y1 = obj->coords.y1;
knob_area->y2 = obj->coords.y2;
}
else {
knob_area->y1 -= (knob_size >> 1);
knob_area->y2 = knob_area->y1 + knob_size - 1;
knob_area->x1 = obj->coords.x1;
knob_area->x2 = obj->coords.x2;
}
int32_t knob_left = lv_obj_get_style_pad_left(obj, LV_PART_KNOB);
int32_t knob_right = lv_obj_get_style_pad_right(obj, LV_PART_KNOB);
int32_t knob_top = lv_obj_get_style_pad_top(obj, LV_PART_KNOB);
int32_t knob_bottom = lv_obj_get_style_pad_bottom(obj, LV_PART_KNOB);
int32_t transf_w = lv_obj_get_style_transform_width(obj, LV_PART_KNOB);
int32_t transf_h = lv_obj_get_style_transform_height(obj, LV_PART_KNOB);
/*Apply the paddings on the knob area*/
knob_area->x1 -= knob_left + transf_w;
knob_area->x2 += knob_right + transf_w;
knob_area->y1 -= knob_top + transf_h;
knob_area->y2 += knob_bottom + transf_h;
}
static bool is_slider_horizontal(lv_obj_t * obj)
{
lv_slider_t * slider = (lv_slider_t *)obj;
if(slider->bar.orientation == LV_BAR_ORIENTATION_AUTO) return lv_obj_get_width(obj) >= lv_obj_get_height(obj);
else if(slider->bar.orientation == LV_BAR_ORIENTATION_HORIZONTAL) return true;
else return false;
}
static void drag_start(lv_obj_t * obj)
{
lv_slider_t * slider = (lv_slider_t *)obj;
lv_slider_mode_t mode = lv_slider_get_mode(obj);
lv_point_t p;
slider->dragging = true;
if(mode == LV_SLIDER_MODE_NORMAL || mode == LV_SLIDER_MODE_SYMMETRICAL) {
slider->value_to_set = &slider->bar.cur_value;
}
else if(mode == LV_SLIDER_MODE_RANGE) {
lv_indev_get_point(lv_indev_active(), &p);
lv_obj_transform_point(obj, &p, LV_OBJ_POINT_TRANSFORM_FLAG_INVERSE_RECURSIVE);
const bool is_rtl = LV_BASE_DIR_RTL == lv_obj_get_style_base_dir(obj, LV_PART_MAIN);
const bool is_horizontal = is_slider_horizontal(obj);
const bool is_reversed = slider->bar.val_reversed ^ (is_rtl && is_horizontal);
int32_t dist_left, dist_right;
if(is_horizontal) {
if((!is_reversed && p.x > slider->right_knob_area.x2) || (is_reversed && p.x < slider->right_knob_area.x1)) {
slider->value_to_set = &slider->bar.cur_value;
}
else if((!is_reversed && p.x < slider->left_knob_area.x1) || (is_reversed && p.x > slider->left_knob_area.x2)) {
slider->value_to_set = &slider->bar.start_value;
}
else {
/*Calculate the distance from each knob*/
dist_left = LV_ABS((slider->left_knob_area.x1 + (slider->left_knob_area.x2 - slider->left_knob_area.x1) / 2) - p.x);
dist_right = LV_ABS((slider->right_knob_area.x1 + (slider->right_knob_area.x2 - slider->right_knob_area.x1) / 2) - p.x);
/*Use whichever one is closer*/
if(dist_right < dist_left) {
slider->value_to_set = &slider->bar.cur_value;
slider->left_knob_focus = 0;
}
else {
slider->value_to_set = &slider->bar.start_value;
slider->left_knob_focus = 1;
}
}
}
else {
if((!is_reversed && p.y < slider->right_knob_area.y1) || (is_reversed && p.y > slider->right_knob_area.y2)) {
slider->value_to_set = &slider->bar.cur_value;
}
else if((!is_reversed && p.y > slider->left_knob_area.y2) || (is_reversed && p.y < slider->left_knob_area.y1)) {
slider->value_to_set = &slider->bar.start_value;
}
else {
/*Calculate the distance from each knob*/
dist_left = LV_ABS((slider->left_knob_area.y1 + (slider->left_knob_area.y2 - slider->left_knob_area.y1) / 2) - p.y);
dist_right = LV_ABS((slider->right_knob_area.y1 + (slider->right_knob_area.y2 - slider->right_knob_area.y1) / 2) - p.y);
/*Use whichever one is closer*/
if(dist_right < dist_left) {
slider->value_to_set = &slider->bar.cur_value;
slider->left_knob_focus = 0;
}
else {
slider->value_to_set = &slider->bar.start_value;
slider->left_knob_focus = 1;
}
}
}
}
}
static void update_knob_pos(lv_obj_t * obj, bool check_drag)
{
lv_slider_t * slider = (lv_slider_t *)obj;
lv_indev_t * indev = lv_indev_active();
if(lv_indev_get_type(indev) != LV_INDEV_TYPE_POINTER)
return;
if(lv_indev_get_scroll_obj(indev) != NULL)
return;
lv_point_t p;
lv_indev_get_point(indev, &p);
lv_obj_transform_point(obj, &p, LV_OBJ_POINT_TRANSFORM_FLAG_INVERSE_RECURSIVE);
bool is_hor = is_slider_horizontal(obj);
if(check_drag && !slider->dragging) {
int32_t ofs = is_hor ? (p.x - slider->pressed_point.x) : (p.y - slider->pressed_point.y);
/*Stop processing when offset is below scroll_limit*/
if(LV_ABS(ofs) < indev->scroll_limit) {
return;
}
}
if(!slider->value_to_set) {
/*Ready to start drag*/
drag_start(obj);
}
int32_t new_value = 0;
const int32_t range = slider->bar.max_value - slider->bar.min_value;
const bool is_rtl = LV_BASE_DIR_RTL == lv_obj_get_style_base_dir(obj, LV_PART_MAIN);
const bool is_horizontal = is_slider_horizontal(obj);
const bool is_reversed = slider->bar.val_reversed ^ (is_rtl && is_horizontal);
if(is_hor) {
const int32_t bg_left = lv_obj_get_style_pad_left(obj, LV_PART_MAIN);
const int32_t bg_right = lv_obj_get_style_pad_right(obj, LV_PART_MAIN);
const int32_t w = lv_obj_get_width(obj);
const int32_t indic_w = w - bg_left - bg_right;
if(is_reversed) {
/*Make the point relative to the indicator*/
new_value = (obj->coords.x2 - bg_right) - p.x;
}
else {
/*Make the point relative to the indicator*/
new_value = p.x - (obj->coords.x1 + bg_left);
}
if(indic_w) {
new_value = (new_value * range + indic_w / 2) / indic_w;
new_value += slider->bar.min_value;
}
}
else {
const int32_t bg_top = lv_obj_get_style_pad_top(obj, LV_PART_MAIN);
const int32_t bg_bottom = lv_obj_get_style_pad_bottom(obj, LV_PART_MAIN);
const int32_t h = lv_obj_get_height(obj);
const int32_t indic_h = h - bg_bottom - bg_top;
if(is_reversed) {
/*Make the point relative to the indicator*/
new_value = p.y - (obj->coords.y1 + bg_top);
}
else {
/*Make the point relative to the indicator*/
new_value = p.y - (obj->coords.y2 + bg_bottom);
new_value = -new_value;
}
new_value = (new_value * range + indic_h / 2) / indic_h;
new_value += slider->bar.min_value;
}
int32_t real_max_value = slider->bar.max_value;
int32_t real_min_value = slider->bar.min_value;
/*Figure out the min. and max. for this mode*/
if(slider->value_to_set == &slider->bar.start_value) {
real_max_value = slider->bar.cur_value;
}
else {
real_min_value = slider->bar.start_value;
}
new_value = LV_CLAMP(real_min_value, new_value, real_max_value);
if(*slider->value_to_set != new_value) {
*slider->value_to_set = new_value;
if(is_hor)
lv_obj_remove_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_VER);
else
lv_obj_remove_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN_HOR);
lv_obj_invalidate(obj);
lv_result_t res = lv_obj_send_event(obj, LV_EVENT_VALUE_CHANGED, NULL);
if(res != LV_RESULT_OK)
return;
}
}
#endif
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