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Fixed bug whereby you could scroll off top (can still scroll off bottom)

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This commit is contained in:
Bobbi Webber-Manners 2020-07-12 23:12:01 -04:00
parent fd4a85b767
commit 2c0c746b9f
1 changed files with 37 additions and 20 deletions
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57
apps/edit.c
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@ -3,10 +3,8 @@
// Bobbi July 2020
/////////////////////////////////////////////////////////////////////////////
// TODO: it is possible to scroll off beginning or end of doc
// TODO: Probably should convert tabs to space in loading and when tab key
// is pressed. Much easier to deal with. Implications for reading
// long file in chunks??
// TODO: it is possible to scroll off end of doc
// TODO: Convert tabs to spaces in load_file()
// TODO: The code doesn't check for error cases when calling gap buffer
// functions.
@ -126,6 +124,13 @@ uint8_t jump_pos(uint16_t pos) {
return 0;
}
/*
* Go to next tabstop
*/
uint8_t next_tabstop(uint8_t col) {
return (col / 8) * 8 + 8;
}
/*
* Load a file from disk into the gapbuf
* filename - name of file to load
@ -172,13 +177,6 @@ uint8_t save_file(char *filename) {
return 0;
}
/*
* Go to next tabstop
*/
uint8_t next_tabstop(uint8_t col) {
return (col / 8) * 8 + 8;
}
/*
* Read next char from gapbuf[] and update state.
* Returns 1 on EOL, 0 otherwise
@ -204,7 +202,7 @@ uint8_t read_char_update_pos(void) {
if (do_print)
putchar(c);
++col;
if (col >= NCOLS) {
if (col == NCOLS) {
if (do_print)
rowlen[row] = NCOLS;
++row;
@ -418,10 +416,14 @@ void cursor_left(void) {
return;
}
if (curscol == 0) {
if (cursrow == 0)
if (cursrow == 0) {
scroll_up();
else
--cursrow;
if (cursrow == 0) {
putchar(BELL);
return;
}
}
--cursrow;
curscol = rowlen[cursrow];
} else
--curscol;
@ -440,10 +442,14 @@ void cursor_right(void) {
}
++curscol;
if (curscol == rowlen[cursrow]) {
if (cursrow == NROWS)
if (cursrow == NROWS - 1) {
scroll_down();
else
++cursrow;
if (cursrow == NROWS - 1) {
putchar(BELL);
return;
}
}
++cursrow;
curscol = 0;
}
gotoxy(curscol, cursrow);
@ -454,8 +460,14 @@ void cursor_right(void) {
*/
void cursor_up(void) {
uint8_t i;
if (cursrow == 0)
if (cursrow == 0) {
scroll_up();
if (cursrow == 0) {
putchar(BELL);
gotoxy(curscol, cursrow);
return;
}
}
for (i = 0; i < curscol; ++i)
gapbuf[gapend--] = gapbuf[--gapbegin];
--cursrow;
@ -472,8 +484,13 @@ void cursor_up(void) {
*/
void cursor_down(void) {
uint8_t i;
if (cursrow == NROWS - 1)
if (cursrow == NROWS - 1) {
scroll_down();
if (cursrow == NROWS - 1) {
putchar(BELL);
return;
}
}
for (i = 0; i < rowlen[cursrow] - curscol; ++i)
gapbuf[gapbegin++] = gapbuf[++gapend];
++cursrow;