lv_text.h
Enums
Functions
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void lv_text_get_size(lv_point_t *size_res, const char *text, const lv_font_t *font, int32_t letter_space, int32_t line_space, int32_t max_width, lv_text_flag_t flag)
Get size of a text
line breaks
- 参数:
size_res -- pointer to a 'point_t' variable to store the result
text -- pointer to a text
font -- pointer to font of the text
letter_space -- letter space of the text
line_space -- line space of the text
max_width -- max width of the text (break the lines to fit this size). Set COORD_MAX to avoid
flag -- settings for the text from ::lv_text_flag_t
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uint32_t _lv_text_get_next_line(const char *txt, const lv_font_t *font, int32_t letter_space, int32_t max_width, int32_t *used_width, lv_text_flag_t flag)
Get the next line of text. Check line length and break chars too.
- 参数:
txt -- a '\0' terminated string
font -- pointer to a font
letter_space -- letter space
max_width -- max width of the text (break the lines to fit this size). Set COORD_MAX to avoid line breaks
used_width -- When used_width != NULL, save the width of this line if flag == LV_TEXT_FLAG_NONE, otherwise save -1.
flag -- settings for the text from 'txt_flag_type' enum
- 返回:
the index of the first char of the new line (in byte index not letter index. With UTF-8 they are different)
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int32_t lv_text_get_width(const char *txt, uint32_t length, const lv_font_t *font, int32_t letter_space)
Give the length of a text with a given font
- 参数:
txt -- a '\0' terminate string
length -- length of 'txt' in byte count and not characters (Á is 1 character but 2 bytes in UTF-8)
font -- pointer to a font
letter_space -- letter space
- 返回:
length of a char_num long text
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void _lv_text_ins(char *txt_buf, uint32_t pos, const char *ins_txt)
Insert a string into an other
- 参数:
txt_buf -- the original text (must be big enough for the result text and NULL terminated)
pos -- position to insert (0: before the original text, 1: after the first char etc.)
ins_txt -- text to insert, must be '\0' terminated
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void _lv_text_cut(char *txt, uint32_t pos, uint32_t len)
Delete a part of a string
- 参数:
txt -- string to modify, must be '\0' terminated and should point to a heap or stack frame, not read-only memory.
pos -- position where to start the deleting (0: before the first char, 1: after the first char etc.)
len -- number of characters to delete
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char *_lv_text_set_text_vfmt(const char *fmt, va_list ap)
return a new formatted text. Memory will be allocated to store the text.
- 参数:
fmt --
printf-like formatap -- items to print
- 返回:
pointer to the allocated text string.
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void _lv_text_encoded_letter_next_2(const char *txt, uint32_t *letter, uint32_t *letter_next, uint32_t *ofs)
Decode two encoded character from a string.
- 参数:
txt -- pointer to '\0' terminated string
letter -- the first decoded Unicode character or 0 on invalid data code
letter_next -- the second decoded Unicode character or 0 on invalid data code
ofs -- start index in 'txt' where to start. After the call it will point to the next encoded char in 'txt'. NULL to use txt[0] as index
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static inline bool _lv_text_is_break_char(uint32_t letter)
Test if char is break char or not (a text can broken here or not)
- 参数:
letter -- a letter
- 返回:
false: 'letter' is not break char
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static inline bool _lv_text_is_a_word(uint32_t letter)
Test if char is break char or not (a text can broken here or not)
- 参数:
letter -- a letter
- 返回:
false: 'letter' is not break char
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static inline bool _lv_text_is_marker(uint32_t letter)
Test if character can be treated as marker, and don't need to be rendered. Note, this is not a full list. Add your findings to the list.
- 参数:
letter -- a letter
- 返回:
true if so
Variables
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uint8_t (*_lv_text_encoded_size)(const char*)
Give the size of an encoded character
- Param str:
pointer to a character in a string
- Return:
length of the encoded character (1,2,3 ...). O in invalid
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uint32_t (*_lv_text_unicode_to_encoded)(uint32_t)
Convert a Unicode letter to encoded
- Param letter_uni:
a Unicode letter
- Return:
Encoded character in Little Endian to be compatible with C chars (e.g. 'Á', 'Ü')
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uint32_t (*_lv_text_encoded_conv_wc)(uint32_t c)
Convert a wide character, e.g. 'Á' little endian to be compatible with the encoded format.
- Param c:
a wide character
- Return:
cin the encoded format
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uint32_t (*_lv_text_encoded_next)(const char*, uint32_t*)
Decode the next encoded character from a string.
- Param txt:
pointer to '\0' terminated string
- Param i:
start index in 'txt' where to start. After the call it will point to the next encoded char in 'txt'. NULL to use txt[0] as index
- Return:
the decoded Unicode character or 0 on invalid data code
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uint32_t (*_lv_text_encoded_prev)(const char*, uint32_t*)
Get the previous encoded character form a string.
- Param txt:
pointer to '\0' terminated string
- Param i_start:
index in 'txt' where to start. After the call it will point to the previous encoded char in 'txt'.
- Return:
the decoded Unicode character or 0 on invalid data
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uint32_t (*_lv_text_encoded_get_byte_id)(const char*, uint32_t)
Convert a letter index (in the encoded text) to byte index. E.g. in UTF-8 "AÁRT" index of 'R' is 2 but start at byte 3 because 'Á' is 2 bytes long
- Param txt:
a '\0' terminated UTF-8 string
- Param enc_id:
letter index
- Return:
byte index of the 'enc_id'th letter
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uint32_t (*_lv_text_encoded_get_char_id)(const char*, uint32_t)
Convert a byte index (in an encoded text) to character index. E.g. in UTF-8 "AÁRT" index of 'R' is 2 but start at byte 3 because 'Á' is 2 bytes long
- Param txt:
a '\0' terminated UTF-8 string
- Param byte_id:
byte index
- Return:
character index of the letter at 'byte_id'th position
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uint32_t (*_lv_text_get_encoded_length)(const char*)
Get the number of characters (and NOT bytes) in a string. E.g. in UTF-8 "ÁBC" is 3 characters (but 4 bytes)
- Param txt:
a '\0' terminated char string
- Return:
number of characters