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Merge pull request #1261 from joltwallet/fix/txt_long_len

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Fix/txt long len wrapping and disable macro
This commit is contained in:
Gabor Kiss-Vamosi 2019-11-13 08:38:44 +01:00 committed by GitHub
commit 7814d31613
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2 changed files with 31 additions and 21 deletions
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16
lv_conf_template.h
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@ -344,14 +344,18 @@ typedef void * lv_font_user_data_t;
/*Can break (wrap) texts on these chars*/
#define LV_TXT_BREAK_CHARS " ,.;:-_"
/* If a character is at least this long, will break wherever "prettiest" */
#define LV_TXT_LINE_BREAK_LONG_LEN 12
/* Minimum number of characters of a word to put on a line before a break */
#define LV_TXT_LINE_BREAK_LONG_PRE_MIN_LEN 3
/* If a word is at least this long, will break wherever "prettiest"
* To disable, set to a value <= 0 */
#define LV_TXT_LINE_BREAK_LONG_LEN 12
/* Minimum number of characters of a word to put on a line after a break */
#define LV_TXT_LINE_BREAK_LONG_POST_MIN_LEN 3
/* Minimum number of characters in a long word to put on a line before a break.
* Depends on LV_TXT_LINE_BREAK_LONG_LEN. */
#define LV_TXT_LINE_BREAK_LONG_PRE_MIN_LEN 3
/* Minimum number of characters in a long word to put on a line after a break.
* Depends on LV_TXT_LINE_BREAK_LONG_LEN. */
#define LV_TXT_LINE_BREAK_LONG_POST_MIN_LEN 3
/* Support bidirectional texts.
* Allows mixing Left-to-Right and Right-to-Left texts.

36
src/lv_misc/lv_txt.c
View File

@ -149,17 +149,21 @@ void lv_txt_get_size(lv_point_t * size_res, const char * text, const lv_font_t *
* 3. Return i=9, pointing at breakchar '\n'
* 4. Parenting lv_txt_get_next_line() would detect subsequent '\0'
*
* TODO: Returned word_w_ptr may overestimate the returned word's width when
* max_width is reached. In current usage, this has no impact.
*
* @param txt a '\0' terminated string
* @param font pointer to a font
* @param letter_space letter space
* @param max_width max with of the text (break the lines to fit this size) Set CORD_MAX to avoid line breaks
* @param flags settings for the text from 'txt_flag_type' enum
* @param[out] word_w_ptr width (in pixels) of the parsed word. May be NULL.
* @param force Force return the fraction of the word that can fit in the provided space.
* @return the index of the first char of the next word (in byte index not letter index. With UTF-8 they are different)
*/
static uint16_t lv_txt_get_next_word(const char * txt, const lv_font_t * font,
lv_coord_t letter_space, lv_coord_t max_width,
lv_txt_flag_t flag, uint32_t *word_w_ptr)
lv_txt_flag_t flag, uint32_t *word_w_ptr, bool force)
{
if(txt == NULL || txt[0] == '\0') return 0;
if(font == NULL) return 0;
@ -179,6 +183,7 @@ static uint16_t lv_txt_get_next_word(const char * txt, const lv_font_t * font,
letter = lv_txt_encoded_next(txt, &i_next);
i_next_next = i_next;
/* Obtain the full word, regardless if it fits or not in max_width */
while(txt[i] != '\0') {
letter_next = lv_txt_encoded_next(txt, &i_next_next);
word_len++;
@ -196,17 +201,10 @@ static uint16_t lv_txt_get_next_word(const char * txt, const lv_font_t * font,
letter_w = lv_font_get_glyph_width(font, letter, letter_next);
cur_w += letter_w;
/* Test if this character fits within max_width */
if( break_index == NO_BREAK_FOUND && cur_w > max_width) {
if(break_index == NO_BREAK_FOUND && cur_w > max_width) {
break_index = i;
if(break_index > 0) { /* zero is possible if first character doesn't fit in width */
lv_txt_encoded_prev(txt, &break_index);
break_letter_count = word_len - 2;
}
else{
break_letter_count = word_len - 1;
}
break_letter_count = word_len - 1;
/* break_index is now pointing at the character that doesn't fit */
}
@ -237,14 +235,17 @@ static uint16_t lv_txt_get_next_word(const char * txt, const lv_font_t * font,
return i;
}
#if LV_TXT_LINE_BREAK_LONG_LEN > 0
/* Word doesn't fit in provided space, but isn't "long" */
if(word_len < LV_TXT_LINE_BREAK_LONG_LEN) {
if(word_w_ptr != NULL) *word_w_ptr = 0;
if( force ) return break_index;
if(word_w_ptr != NULL) *word_w_ptr = 0; /* Return no word */
return 0;
}
/* Word is "long," but insufficient amounts can fit in provided space */
if(break_letter_count < LV_TXT_LINE_BREAK_LONG_PRE_MIN_LEN) {
if( force ) return break_index;
if(word_w_ptr != NULL) *word_w_ptr = 0;
return 0;
}
@ -256,12 +257,17 @@ static uint16_t lv_txt_get_next_word(const char * txt, const lv_font_t * font,
/* Move pointer "i" backwards */
for(;n_move>0; n_move--){
lv_txt_encoded_prev(txt, &i);
// todo: it would be appropriate to update the returned word width here
// TODO: it would be appropriate to update the returned word width here
// However, in current usage, this doesn't impact anything.
}
}
return i;
#else
if( force ) return break_index;
if(word_w_ptr != NULL) *word_w_ptr = 0; /* Return no word */
(void) break_letter_count;
return 0;
#endif
}
/**
@ -288,7 +294,7 @@ uint16_t lv_txt_get_next_line(const char * txt, const lv_font_t * font,
while(txt[i] != '\0' && max_width > 0) {
uint32_t word_w = 0;
uint32_t advance = lv_txt_get_next_word(&txt[i], font, letter_space, max_width, flag, &word_w);
uint32_t advance = lv_txt_get_next_word(&txt[i], font, letter_space, max_width, flag, &word_w, i==0);
max_width -= word_w;
if( advance == 0 ){
@ -307,7 +313,7 @@ uint16_t lv_txt_get_next_line(const char * txt, const lv_font_t * font,
}
/*Always step at least one to avoid infinite loops*/
/* Always step at least one to avoid infinite loops */
if(i == 0) {
lv_txt_encoded_next(txt, &i);
}