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Fix some off by one bugs with line scrolling and some cleanup

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Instead of trying (and failing) to correctly calculate the number of lines on the
screen a given message will need space for, we dynamically set the value both
on initiation of a new line, and whenever that line is printed to the screen
using the print_wrap() function.

This should fix the screen occasionally not scrolling down the correct number of
lines when a new message is printed.
This commit is contained in:
jfreegman 2020-11-23 12:45:46 -05:00
parent 56ba61e061
commit f0c4906fdc
No known key found for this signature in database
GPG Key ID: 3627F3144076AE63
2 changed files with 67 additions and 48 deletions
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109
src/line_info.c
View File

@ -46,7 +46,7 @@ void line_info_init(struct history *hst)
hst->line_start = hst->line_root;
hst->line_end = hst->line_start;
hst->queue_sz = 0;
hst->queue_size = 0;
}
/* resets line_start (moves to end of chat history) */
@ -58,21 +58,20 @@ void line_info_reset_start(ToxWindow *self, struct history *hst)
return;
}
int y2, x2;
int y2;
int x2;
getmaxyx(self->window, y2, x2);
UNUSED_VAR(x2);
int side_offst = self->show_peerlist ? SIDEBAR_WIDTH : 0;
int top_offst = (self->type == WINDOW_TYPE_CHAT) || (self->type == WINDOW_TYPE_PROMPT) ? 2 : 0;
int max_y = (y2 - CHATBOX_HEIGHT - top_offst);
int max_y = y2 - CHATBOX_HEIGHT - top_offst;
int curlines = 0;
int nxtlines = line->newlines + (line->format_len / (x2 - side_offst));
do {
curlines += 1 + nxtlines;
curlines += line->format_lines;
line = line->prev;
nxtlines = line->newlines + (line->format_len / (x2 - side_offst));
} while (line->prev && curlines + nxtlines < max_y);
} while (line->prev && curlines + line->format_lines < max_y);
hst->line_start = line;
}
@ -87,9 +86,7 @@ void line_info_cleanup(struct history *hst)
tmp1 = tmp2;
}
int i;
for (i = 0; i < hst->queue_sz; ++i) {
for (size_t i = 0; i < hst->queue_size; ++i) {
if (hst->queue[i]) {
free(hst->queue[i]);
}
@ -117,24 +114,22 @@ static void line_info_root_fwd(struct history *hst)
/* returns ptr to queue item 0 and removes it from queue. Returns NULL if queue is empty. */
static struct line_info *line_info_ret_queue(struct history *hst)
{
if (hst->queue_sz <= 0) {
if (hst->queue_size == 0) {
return NULL;
}
struct line_info *line = hst->queue[0];
int i;
for (i = 0; i < hst->queue_sz; ++i) {
for (size_t i = 0; i < hst->queue_size; ++i) {
hst->queue[i] = hst->queue[i + 1];
}
--hst->queue_sz;
--hst->queue_size;
return line;
}
/* Prints `n` chars from `s` to `win`.
/* Prints a maximum of `n` chars from `s` to `win`.
*
* Return true if the string contains a newline or tab byte.
*/
@ -144,7 +139,9 @@ static bool print_n_chars(WINDOW *win, const char *s, size_t n)
char ch;
for (size_t i = 0; i < n && (ch = s[i]); ++i) {
waddch(win, ch);
if (win) {
wprintw(win, "%c", ch);
}
if (ch == '\n') {
newline = true;
@ -169,22 +166,29 @@ static int rspace_index(const char *s, int limit)
}
/* Prints line message to window, wrapping at the last word that fits on the current line.
/* Prints `line` message to window, wrapping at the last word that fits on the current line.
* This function updates the `format_lines` field of `line` according to current window dimensions.
*
* This function updates the `format_len` field of `line` according to current window dimensions.
* If `win` is null nothing will be printed to the window. This is useful to set the
* `format_lines` field on initialization.
*/
static void print_wrap(WINDOW *win, struct line_info *line, int max_x)
{
const char *msg = line->msg;
uint16_t length = line->msg_len;
uint16_t real_len = length;
uint16_t lines = line->newlines;
const int x_start = line->len - line->msg_len - 1; // manually keep track of x position because ncurses sucks
while (msg) {
++lines;
int x_limit = max_x - x_start;
if (length < x_limit || x_limit <= 0) {
wprintw(win, "%s", msg);
if (win) {
wprintw(win, "%s", msg);
}
break;
}
@ -199,15 +203,15 @@ static void print_wrap(WINDOW *win, struct line_info *line, int max_x)
// replace last space on current line with newline if we intend to split it
if (length >= x_limit && !newline) {
waddch(win, '\n');
--length;
++msg;
real_len += x_limit + 1; // include empty space at end of line
/* Add padding to the start of the next line */
for (size_t i = 0; i < x_start; ++i) {
waddch(win, ' ');
++real_len;
if (win) {
waddch(win, '\n');
for (size_t i = 0; i < x_start; ++i) {
waddch(win, ' '); // Add padding to the start of the next line
}
}
}
} else {
@ -217,7 +221,18 @@ static void print_wrap(WINDOW *win, struct line_info *line, int max_x)
}
}
line->format_len = line->len - line->msg_len + real_len;
line->format_lines = lines;
}
static void line_info_init_line(WINDOW *win, struct line_info *line)
{
int max_y;
int max_x;
UNUSED_VAR(max_y);
getmaxyx(win, max_y, max_x);
print_wrap(NULL, line, max_x);
}
/* creates new line_info line and puts it in the queue.
@ -234,7 +249,7 @@ int line_info_add(ToxWindow *self, const char *timestr, const char *name1, const
struct history *hst = self->chatwin->hst;
if (hst->queue_sz >= MAX_LINE_INFO_QUEUE) {
if (hst->queue_size >= MAX_LINE_INFO_QUEUE) {
return -1;
}
@ -322,9 +337,8 @@ int line_info_add(ToxWindow *self, const char *timestr, const char *name1, const
len += strlen(new_line->name2);
}
new_line->id = (hst->line_end->id + 1 + hst->queue_sz) % INT_MAX;
new_line->id = (hst->line_end->id + 1 + hst->queue_size) % INT_MAX;
new_line->len = len;
new_line->format_len = len;
new_line->msg_len = msg_len;
new_line->type = type;
new_line->bold = bold;
@ -332,7 +346,9 @@ int line_info_add(ToxWindow *self, const char *timestr, const char *name1, const
new_line->noread_flag = false;
new_line->timestamp = get_unix_time();
hst->queue[hst->queue_sz++] = new_line;
line_info_init_line(self->chatwin->history, new_line);
hst->queue[hst->queue_size++] = new_line;
return new_line->id;
}
@ -356,7 +372,10 @@ static void line_info_check_queue(ToxWindow *self)
hst->line_end = line;
hst->line_end->id = line->id;
int y, y2, x, x2;
int y;
int y2;
int x;
int x2;
getmaxyx(self->window, y2, x2);
getyx(self->chatwin->history, y, x);
@ -366,14 +385,13 @@ static void line_info_check_queue(ToxWindow *self)
return;
}
int offst = self->show_peerlist ? SIDEBAR_WIDTH : 0; /* offset width of conference sidebar */
int lines = 1 + line->newlines + (line->format_len / (x2 - offst));
int lines = line->format_lines;
int max_y = y2 - CHATBOX_HEIGHT;
/* move line_start forward proportionate to the number of new lines */
if (y + lines - 1 >= max_y) {
if (y + lines > max_y) {
while (lines > 0 && hst->line_start->next) {
lines -= 1 + hst->line_start->next->newlines + (hst->line_start->next->format_len / (x2 - offst));
lines -= hst->line_start->next->format_lines;
hst->line_start = hst->line_start->next;
++hst->start_id;
}
@ -399,7 +417,9 @@ void line_info_print(ToxWindow *self)
wclear(win);
int y2, x2;
int y2;
int x2;
getmaxyx(self->window, y2, x2);
@ -612,7 +632,7 @@ void line_info_print(ToxWindow *self)
}
/* keep calling until queue is empty */
if (hst->queue_sz > 0) {
if (hst->queue_size > 0) {
line_info_print(self);
}
}
@ -657,10 +677,9 @@ static void line_info_page_up(ToxWindow *self, struct history *hst)
UNUSED_VAR(x2);
int jump_dist = y2 / 2;
int i;
size_t jump_dist = y2 / 2;
for (i = 0; i < jump_dist && hst->line_start->prev; ++i) {
for (size_t i = 0; i < jump_dist && hst->line_start->prev; ++i) {
hst->line_start = hst->line_start->prev;
}
}
@ -672,9 +691,9 @@ static void line_info_page_down(ToxWindow *self, struct history *hst)
UNUSED_VAR(x2);
int jump_dist = y2 / 2;
size_t jump_dist = y2 / 2;
for (int i = 0; i < jump_dist && hst->line_start->next; ++i) {
for (size_t i = 0; i < jump_dist && hst->line_start->next; ++i) {
hst->line_start = hst->line_start->next;
}
}

6
src/line_info.h
View File

@ -29,7 +29,7 @@
#define MAX_HISTORY 100000
#define MIN_HISTORY 40
#define MAX_LINE_INFO_QUEUE 1024
#define MAX_LINE_INFO_MSG_SIZE MAX_STR_SIZE + TOXIC_MAX_NAME_LENGTH + 32 /* needs extra room for log loading */
#define MAX_LINE_INFO_MSG_SIZE (MAX_STR_SIZE + TOXIC_MAX_NAME_LENGTH + 32) /* needs extra room for log loading */
typedef enum {
SYS_MSG,
@ -57,9 +57,9 @@ struct line_info {
uint8_t noread_flag; /* true if a line should be flagged as unread */
uint32_t id;
uint16_t len; /* combined length of entire line */
uint16_t format_len; /* formatted length of combined string (dynamically set by print_wrap()) */
uint16_t msg_len; /* length of the message */
uint8_t newlines;
uint16_t format_lines; /* number of lines the combined string takes up (dynamically set) */
struct line_info *prev;
struct line_info *next;
@ -73,7 +73,7 @@ struct history {
uint32_t start_id; /* keeps track of where line_start should be when at bottom of history */
struct line_info *queue[MAX_LINE_INFO_QUEUE];
int queue_sz;
size_t queue_size;
};
/* creates new line_info line and puts it in the queue.