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lvgl/lv_objx/lv_ta.c

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/**
* @file lv_ta.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_conf.h"
#if USE_LV_TA != 0
#include "lv_ta.h"
#include "lvgl/lv_misc/anim.h"
#include "../lv_draw/lv_draw.h"
/*********************
* DEFINES
*********************/
/*Test configuration*/
#ifndef LV_TA_MAX_LENGTH
#define LV_TA_MAX_LENGTH 256
#endif
#ifndef LV_TA_CUR_BLINK_TIME
#define LV_TA_CUR_BLINK_TIME 400 /*ms*/
#endif
#define LV_TA_DEF_WIDTH (120 * LV_DOWNSCALE)
#define LV_TA_DEF_HEIGHT (80 * LV_DOWNSCALE)
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static bool lv_ta_design(lv_obj_t * ta, const area_t * mask, lv_design_mode_t mode);
static bool lv_ta_scrling_design(lv_obj_t * scrling, const area_t * mask, lv_design_mode_t mode);
static void lv_ta_hide_cursor(lv_obj_t * ta, uint8_t hide);
static void lv_ta_save_valid_cursor_x(lv_obj_t * ta);
static void lv_tas_init(void);
/**********************
* STATIC VARIABLES
**********************/
static lv_tas_t lv_tas_def;
static lv_tas_t lv_tas_simple;
static lv_tas_t lv_tas_transp;
lv_design_f_t ancestor_design_f;
lv_design_f_t scrl_design_f;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/*-----------------
* Create function
*-----------------*/
/**
* Create a text area objects
* @param par pointer to an object, it will be the parent of the new text area
* @param copy pointer to a text area object, if not NULL then the new object will be copied from it
* @return pointer to the created text area
*/
lv_obj_t * lv_ta_create(lv_obj_t * par, lv_obj_t * copy)
{
/*Create the ancestor object*/
lv_obj_t * new_ta = lv_page_create(par, copy);
dm_assert(new_ta);
/*Allocate the object type specific extended data*/
lv_ta_ext_t * ext = lv_obj_alloc_ext(new_ta, sizeof(lv_ta_ext_t));
dm_assert(ext);
ext->cur_hide = 0;
ext->cursor_pos = 0;
ext->cursor_valid_x = 0;
ext->label = NULL;
if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_f(new_ta);
if(scrl_design_f == NULL) scrl_design_f = lv_obj_get_design_f(ext->page.scrl);
lv_obj_set_signal_f(new_ta, lv_ta_signal);
lv_obj_set_design_f(new_ta, lv_ta_design);
/*Init the new text area object*/
if(copy == NULL) {
ext->label = lv_label_create(new_ta, NULL);
lv_obj_set_design_f(ext->page.scrl, lv_ta_scrling_design);
lv_label_set_long_mode(ext->label, LV_LABEL_LONG_BREAK);
lv_label_set_text(ext->label, "Text area");
lv_page_glue_obj(ext->label, true);
lv_obj_set_click(ext->label, false);
lv_obj_set_style(new_ta, lv_tas_get(LV_TAS_DEF, NULL));
lv_obj_set_size(new_ta, LV_TA_DEF_WIDTH, LV_TA_DEF_HEIGHT);
}
/*Copy an existing object*/
else {
lv_obj_set_design_f(ext->page.scrl, lv_ta_scrling_design);
lv_ta_ext_t * copy_ext = lv_obj_get_ext(copy);
ext->label = lv_label_create(new_ta, copy_ext->label);
lv_page_glue_obj(ext->label, true);
/*Refresh the style with new signal function*/
lv_obj_refr_style(new_ta);
}
/*Create a cursor blinker animation*/
anim_t a;
a.var = new_ta;
a.fp = (anim_fp_t)lv_ta_hide_cursor;
a.time = LV_TA_CUR_BLINK_TIME;
a.act_time = 0;
a.end_cb = NULL;
a.start = 0;
a.end= 1;
a.repeat = 1;
a.repeat_pause = 0;
a.playback = 1;
a.playback_pause = 0;
a.path = anim_get_path(ANIM_PATH_STEP);
anim_create(&a);
return new_ta;
}
/**
* Signal function of the text area
* @param ta pointer to a text area 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_ta_signal(lv_obj_t * ta, lv_signal_t sign, void * param)
{
bool valid;
/* Include the ancient signal function */
valid = lv_page_signal(ta, sign, param);
/* The object can be deleted so check its validity and then
* make the object specific signal handling */
if(valid != false) {
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
lv_tas_t * style = lv_obj_get_style(ta);
switch(sign) {
case LV_SIGNAL_CLEANUP:
/* Nothing to clean up.
* (The created label will be deleted automatically) */
break;
case LV_SIGNAL_STYLE_CHG:
if(ext->label) {
lv_obj_set_style(ext->label, &style->labels);
lv_obj_set_width(ext->label, lv_obj_get_width(ta) - 2 *
(style->pages.bg_rects.hpad + style->pages.scrl_rects.hpad));
lv_label_set_text(ext->label, NULL);
}
break;
/*Set the label width according to the text area width*/
case LV_SIGNAL_CORD_CHG:
if(ext->label != NULL) {
lv_obj_set_width(ext->label, lv_obj_get_width(ta) - 2 *
(style->pages.bg_rects.hpad + style->pages.scrl_rects.hpad));
lv_label_set_text(ext->label, NULL);
}
break;
default:
break;
}
}
return valid;
}
/*=====================
* Setter functions
*====================*/
/**
* Insert a character to the current cursor position
* @param ta pointer to a text area object
* @param c a character
*/
void lv_ta_add_char(lv_obj_t * ta, char c)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
const char * label_txt = lv_label_get_text(ext->label);
/*Test the new length: txt length + 1 (closing'\0') + 1 (c character)*/
if((strlen(label_txt) + 2) > LV_TA_MAX_LENGTH) return;
char buf[LV_TA_MAX_LENGTH];
/*Insert the character*/
memcpy(buf, label_txt, ext->cursor_pos);
buf[ext->cursor_pos] = c;
memcpy(buf+ext->cursor_pos+1, label_txt+ext->cursor_pos, strlen(label_txt) - ext->cursor_pos + 1);
/*Refresh the label*/
lv_label_set_text(ext->label, buf);
/*Move the cursor after the new character*/
lv_ta_set_cursor_pos(ta, lv_ta_get_cursor_pos(ta) + 1);
/*It is a valid x step so save it*/
lv_ta_save_valid_cursor_x(ta);
}
/**
* Insert a text to the current cursor position
* @param ta pointer to a text area object
* @param txt a '\0' terminated string to insert
*/
void lv_ta_add_text(lv_obj_t * ta, const char * txt)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
const char * label_txt = lv_label_get_text(ext->label);
uint16_t label_len = strlen(label_txt);
uint16_t txt_len = strlen(txt);
/*Test the new length (+ 1 for the closing '\0')*/
if((label_len + txt_len + 1) > LV_TA_MAX_LENGTH) return;
/*Insert the text*/
char buf[LV_TA_MAX_LENGTH];
memcpy(buf, label_txt, ext->cursor_pos);
memcpy(buf + ext->cursor_pos, txt, txt_len);
memcpy(buf + ext->cursor_pos + txt_len, label_txt+ext->cursor_pos, label_len - ext->cursor_pos + 1);
/*Refresh the label*/
lv_label_set_text(ext->label, buf);
/*Move the cursor after the new text*/
lv_ta_set_cursor_pos(ta, lv_ta_get_cursor_pos(ta) + txt_len);
/*It is a valid x step so save it*/
lv_ta_save_valid_cursor_x(ta);
}
/**
* Set the text of a text area
* @param ta pointer to a text area
* @param txt pointer to the text
*/
void lv_ta_set_text(lv_obj_t * ta, const char * txt)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
lv_label_set_text(ext->label, txt);
lv_ta_set_cursor_pos(ta, LV_TA_CUR_LAST);
/*It is a valid x step so save it*/
lv_ta_save_valid_cursor_x(ta);
}
/**
* Delete a the left character from the current cursor position
* @param ta pointer to a text area object
*/
void lv_ta_del(lv_obj_t * ta)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
uint16_t cur_pos = ext->cursor_pos;
if(cur_pos == 0) return;
/*Delete a character*/
char buf[LV_TA_MAX_LENGTH];
const char * label_txt = lv_label_get_text(ext->label);
uint16_t label_len = strlen(label_txt);
memcpy(buf, label_txt, cur_pos - 1);
memcpy(buf+cur_pos - 1, label_txt + cur_pos, label_len - cur_pos + 1);
/*Refresh the label*/
lv_label_set_text(ext->label, buf);
/*Move the cursor to the place of the deleted character*/
lv_ta_set_cursor_pos(ta, lv_ta_get_cursor_pos(ta) - 1);
/*It is a valid x step so save it*/
lv_ta_save_valid_cursor_x(ta);
}
/**
* Set the cursor position
* @param obj pointer to a text area object
* @param pos the new cursor position in character index
* < 0 : index from the end of the text
* LV_TA_CUR_LAST: go after the last character
*/
void lv_ta_set_cursor_pos(lv_obj_t * ta, int16_t pos)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
uint16_t txt_len = strlen(lv_label_get_text(ext->label));
if(pos < 0) pos = txt_len + pos;
if(pos > txt_len || pos == LV_TA_CUR_LAST) pos = txt_len;
ext->cursor_pos = pos;
/*Position the label to make the cursor visible*/
lv_obj_t * label_par = lv_obj_get_parent(ext->label);
point_t cur_pos;
lv_tas_t * style = lv_obj_get_style(ta);
const font_t * font_p = font_get(style->labels.font);
area_t label_cords;
area_t ta_cords;
lv_label_get_letter_pos(ext->label, pos, &cur_pos);
lv_obj_get_cords(ta, &ta_cords);
lv_obj_get_cords(ext->label, &label_cords);
/*Check the top*/
if(lv_obj_get_y(label_par) + cur_pos.y < 0) {
lv_obj_set_y(label_par, - cur_pos.y);
}
/*Check the bottom*/
if(label_cords.y1 + cur_pos.y + font_get_height(font_p) + style->pages.scrl_rects.vpad > ta_cords.y2) {
lv_obj_set_y(label_par, -(cur_pos.y - lv_obj_get_height(ta) +
font_get_height(font_p) + 2 * style->pages.scrl_rects.vpad));
}
lv_obj_inv(ta);
}
/**
* Move the cursor one character right
* @param ta pointer to a text area object
*/
void lv_ta_cursor_right(lv_obj_t * ta)
{
uint16_t cp = lv_ta_get_cursor_pos(ta);
cp++;
lv_ta_set_cursor_pos(ta, cp);
/*It is a valid x step so save it*/
lv_ta_save_valid_cursor_x(ta);
}
/**
* Move the cursor one character left
* @param ta pointer to a text area object
*/
void lv_ta_cursor_left(lv_obj_t * ta)
{
uint16_t cp = lv_ta_get_cursor_pos(ta);
if(cp > 0) {
cp--;
lv_ta_set_cursor_pos(ta, cp);
/*It is a valid x step so save it*/
lv_ta_save_valid_cursor_x(ta);
}
}
/**
* Move the cursor one line down
* @param ta pointer to a text area object
*/
void lv_ta_cursor_down(lv_obj_t * ta)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
point_t pos;
/*Get the position of the current letter*/
lv_label_get_letter_pos(ext->label, lv_ta_get_cursor_pos(ta), &pos);
/*Increment the y with one line and keep the valid x*/
lv_labels_t * label_style = lv_obj_get_style(ext->label);
const font_t * font_p = font_get(label_style->font);
pos.y += font_get_height(font_p) + label_style->line_space + 1;
pos.x = ext->cursor_valid_x;
/*Do not go below he last line*/
if(pos.y < lv_obj_get_height(ext->label)) {
/*Get the letter index on the new cursor position and set it*/
uint16_t new_cur_pos = lv_label_get_letter_on(ext->label, &pos);
lv_ta_set_cursor_pos(ta, new_cur_pos);
}
}
/**
* Move the cursor one line up
* @param ta pointer to a text area object
*/
void lv_ta_cursor_up(lv_obj_t * ta)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
point_t pos;
/*Get the position of the current letter*/
lv_label_get_letter_pos(ext->label, lv_ta_get_cursor_pos(ta), &pos);
/*Decrement the y with one line and keep the valid x*/
lv_labels_t * label_style = lv_obj_get_style(ext->label);
const font_t * font = font_get(label_style->font);
pos.y -= font_get_height(font) + label_style->line_space - 1;
pos.x = ext->cursor_valid_x;
/*Get the letter index on the new cursor position and set it*/
uint16_t new_cur_pos = lv_label_get_letter_on(ext->label, &pos);
lv_ta_set_cursor_pos(ta, new_cur_pos);
}
/*=====================
* Getter functions
*====================*/
/**
* Get the text of the i the text area
* @param ta obj pointer to a text area object
* @return pointer to the text
*/
const char * lv_ta_get_txt(lv_obj_t * ta)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
return lv_label_get_text(ext->label);
}
/**
* Get the current cursor position in character index
* @param ta pointer to a text area object
* @return the cursor position
*/
uint16_t lv_ta_get_cursor_pos(lv_obj_t * ta)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
return ext->cursor_pos;
}
/**
* Return with a pointer to a built-in style and/or copy it to a variable
* @param style a style name from lv_tas_builtin_t enum
* @param copy copy the style to this variable. (NULL if unused)
* @return pointer to an lv_tas_t style
*/
lv_tas_t * lv_tas_get(lv_tas_builtin_t style, lv_tas_t * copy)
{
static bool style_inited = false;
/*Make the style initialization if it is not done yet*/
if(style_inited == false) {
lv_tas_init();
style_inited = true;
}
lv_tas_t *style_p;
switch(style) {
case LV_TAS_DEF:
style_p = &lv_tas_def;
break;
case LV_TAS_SIMPLE:
style_p = &lv_tas_simple;
break;
case LV_TAS_TRANSP:
style_p = &lv_tas_transp;
break;
default:
style_p = &lv_tas_def;
}
if(copy != NULL) {
if(style_p != NULL) memcpy(copy, style_p, sizeof(lv_tas_t));
else memcpy(copy, &lv_tas_def, sizeof(lv_tas_t));
}
return style_p;
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the text areas
* @param ta 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_MAIN: 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_ta_design(lv_obj_t * ta, const area_t * masp, lv_design_mode_t mode)
{
if(mode == LV_DESIGN_COVER_CHK) {
/*Return false if the object is not covers the mask_p area*/
return ancestor_design_f(ta, masp, mode);
} else if(mode == LV_DESIGN_DRAW_MAIN) {
/*Draw the object*/
ancestor_design_f(ta, masp, mode);
} else if(mode == LV_DESIGN_DRAW_POST) {
ancestor_design_f(ta, masp, mode);
}
return true;
}
/**
* An extended scrolling design of the page. Calls the normal design function and it draws a cursor.
* @param label pointer to a text area 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_MAIN: draw the object (always return 'true')
* LV_DESIGN_DRAW_POST: drawing after every children are drawn
* @return return true/false, depends on 'mode'
*/
static bool lv_ta_scrling_design(lv_obj_t * scrling, const area_t * mask, lv_design_mode_t mode)
{
if(mode == LV_DESIGN_COVER_CHK) {
/*Return false if the object is not covers the mask_p area*/
return scrl_design_f(scrling, mask, mode);
} else if(mode == LV_DESIGN_DRAW_MAIN) {
/*Draw the object*/
scrl_design_f(scrling, mask, mode);
} else if(mode == LV_DESIGN_DRAW_POST) {
scrl_design_f(scrling, mask, mode);
/*Draw the cursor too*/
lv_obj_t * ta = lv_obj_get_parent(scrling);
lv_ta_ext_t * ta_ext = lv_obj_get_ext(ta);
lv_tas_t * ta_style = lv_obj_get_style(ta);
if(ta_style->cursor_show != 0 && ta_ext->cur_hide == 0) {
uint16_t cur_pos = lv_ta_get_cursor_pos(ta);
point_t letter_pos;
lv_label_get_letter_pos(ta_ext->label, cur_pos, &letter_pos);
area_t cur_area;
lv_labels_t * labels_p = lv_obj_get_style(ta_ext->label);
cur_area.x1 = letter_pos.x + ta_ext->label->cords.x1 - (ta_style->cursor_width >> 1);
cur_area.y1 = letter_pos.y + ta_ext->label->cords.y1;
cur_area.x2 = letter_pos.x + ta_ext->label->cords.x1 + (ta_style->cursor_width >> 1);
cur_area.y2 = letter_pos.y + ta_ext->label->cords.y1 + font_get_height(font_get(labels_p->font));
lv_rects_t cur_rects;
lv_rects_get(LV_RECTS_DEF, &cur_rects);
cur_rects.round = 0;
cur_rects.bwidth = 0;
cur_rects.objs.color = ta_style->cursor_color;
cur_rects.gcolor = ta_style->cursor_color;
lv_draw_rect(&cur_area, mask, &cur_rects, OPA_COVER);
}
}
return true;
}
/**
* Set the cursor visibility to make a blinking cursor
* @param ta pointer to a text area
* @param hide 1: hide the cursor, 0: draw it
*/
static void lv_ta_hide_cursor(lv_obj_t * ta, uint8_t hide)
{
lv_ta_ext_t * ta_ext = lv_obj_get_ext(ta);
if(hide != ta_ext->cur_hide) {
ta_ext->cur_hide = hide == 0 ? 0 : 1;
lv_obj_inv(ta);
}
}
/**
* Save the cursor x position as valid. It is important when jumping up/down to a shorter line
* @param ta pointer to a text area object
*/
static void lv_ta_save_valid_cursor_x(lv_obj_t * ta)
{
lv_ta_ext_t * ext = lv_obj_get_ext(ta);
point_t cur_pos;
lv_label_get_letter_pos(ext->label, ext->cursor_pos, &cur_pos);
ext->cursor_valid_x = cur_pos.x;
}
/**
* Initialize the text area styles
*/
static void lv_tas_init(void)
{
/*Default style*/
lv_pages_get(LV_PAGES_DEF, &lv_tas_def.pages);
lv_tas_def.pages.sb_mode = LV_PAGE_SB_MODE_DRAG;
lv_labels_get(LV_LABELS_TXT, &lv_tas_def.labels);
lv_tas_def.labels.objs.color = COLOR_MAKE(0x20, 0x20, 0x20);
lv_tas_def.cursor_color = COLOR_MAKE(0x10, 0x10, 0x10);
lv_tas_def.cursor_width = 1 * LV_DOWNSCALE; /*>=1 px for visible cursor*/
lv_tas_def.cursor_show = 1;
memcpy(&lv_tas_simple, &lv_tas_def, sizeof(lv_tas_t));
lv_pages_get(LV_PAGES_SIMPLE, &lv_tas_simple.pages);
lv_tas_simple.pages.sb_mode = LV_PAGE_SB_MODE_DRAG;
lv_tas_simple.pages.scrl_rects.objs.transp = 0; /*if transp == 1 the cursor will not be drawn*/
lv_tas_simple.pages.bg_rects.objs.color = COLOR_WHITE;
lv_tas_simple.pages.bg_rects.gcolor = COLOR_SILVER;
lv_tas_simple.pages.bg_rects.bcolor = COLOR_GRAY;
memcpy(&lv_tas_transp, &lv_tas_def, sizeof(lv_tas_t));
lv_pages_get(LV_PAGES_TRANSP, &lv_tas_transp.pages);
lv_tas_transp.pages.scrl_rects.objs.transp = 0; /*if transp == 1 the cursor will not be drawn*/
}
#endif
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