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nuklear/src/nuklear_text_editor.c

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#include "nuklear.h"
#include "nuklear_internal.h"
/* ===============================================================
*
* TEXT EDITOR
*
* ===============================================================*/
/* stb_textedit.h - v1.8 - public domain - Sean Barrett */
struct nk_text_find {
float x,y; /* position of n'th character */
float height; /* height of line */
int first_char, length; /* first char of row, and length */
int prev_first; /*_ first char of previous row */
};
struct nk_text_edit_row {
float x0,x1;
/* starting x location, end x location (allows for align=right, etc) */
float baseline_y_delta;
/* position of baseline relative to previous row's baseline*/
float ymin,ymax;
/* height of row above and below baseline */
int num_chars;
};
/* forward declarations */
NK_INTERN void nk_textedit_makeundo_delete(struct nk_text_edit*, int, int);
NK_INTERN void nk_textedit_makeundo_insert(struct nk_text_edit*, int, int);
NK_INTERN void nk_textedit_makeundo_replace(struct nk_text_edit*, int, int, int);
#define NK_TEXT_HAS_SELECTION(s) ((s)->select_start != (s)->select_end)
NK_INTERN float
nk_textedit_get_width(const struct nk_text_edit *edit, int line_start, int char_id,
const struct nk_user_font *font)
{
int len = 0;
nk_rune unicode = 0;
const char *str = nk_str_at_const(&edit->string, line_start + char_id, &unicode, &len);
return font->width(font->userdata, font->height, str, len);
}
NK_INTERN void
nk_textedit_layout_row(struct nk_text_edit_row *r, struct nk_text_edit *edit,
int line_start_id, float row_height, const struct nk_user_font *font)
{
int l;
int glyphs = 0;
nk_rune unicode;
const char *remaining;
int len = nk_str_len_char(&edit->string);
const char *end = nk_str_get_const(&edit->string) + len;
const char *text = nk_str_at_const(&edit->string, line_start_id, &unicode, &l);
const struct nk_vec2 size = nk_text_calculate_text_bounds(font,
text, (int)(end - text), row_height, &remaining, 0, &glyphs, NK_STOP_ON_NEW_LINE);
r->x0 = 0.0f;
r->x1 = size.x;
r->baseline_y_delta = size.y;
r->ymin = 0.0f;
r->ymax = size.y;
r->num_chars = glyphs;
}
NK_INTERN int
nk_textedit_locate_coord(struct nk_text_edit *edit, float x, float y,
const struct nk_user_font *font, float row_height)
{
struct nk_text_edit_row r;
int n = edit->string.len;
float base_y = 0, prev_x;
int i=0, k;
r.x0 = r.x1 = 0;
r.ymin = r.ymax = 0;
r.num_chars = 0;
/* search rows to find one that straddles 'y' */
while (i < n) {
nk_textedit_layout_row(&r, edit, i, row_height, font);
if (r.num_chars <= 0)
return n;
if (i==0 && y < base_y + r.ymin)
return 0;
if (y < base_y + r.ymax)
break;
i += r.num_chars;
base_y += r.baseline_y_delta;
}
/* below all text, return 'after' last character */
if (i >= n)
return n;
/* check if it's before the beginning of the line */
if (x < r.x0)
return i;
/* check if it's before the end of the line */
if (x < r.x1) {
/* search characters in row for one that straddles 'x' */
k = i;
prev_x = r.x0;
for (i=0; i < r.num_chars; ++i) {
float w = nk_textedit_get_width(edit, k, i, font);
if (x < prev_x+w) {
if (x < prev_x+w/2)
return k+i;
else return k+i+1;
}
prev_x += w;
}
/* shouldn't happen, but if it does, fall through to end-of-line case */
}
/* if the last character is a newline, return that.
* otherwise return 'after' the last character */
if (nk_str_rune_at(&edit->string, i+r.num_chars-1) == '\n')
return i+r.num_chars-1;
else return i+r.num_chars;
}
NK_LIB void
nk_textedit_click(struct nk_text_edit *state, float x, float y,
const struct nk_user_font *font, float row_height)
{
/* API click: on mouse down, move the cursor to the clicked location,
* and reset the selection */
state->cursor = nk_textedit_locate_coord(state, x, y, font, row_height);
state->select_start = state->cursor;
state->select_end = state->cursor;
state->has_preferred_x = 0;
}
NK_LIB void
nk_textedit_drag(struct nk_text_edit *state, float x, float y,
const struct nk_user_font *font, float row_height)
{
/* API drag: on mouse drag, move the cursor and selection endpoint
* to the clicked location */
int p = nk_textedit_locate_coord(state, x, y, font, row_height);
if (state->select_start == state->select_end)
state->select_start = state->cursor;
state->cursor = state->select_end = p;
}
NK_INTERN void
nk_textedit_find_charpos(struct nk_text_find *find, struct nk_text_edit *state,
int n, int single_line, const struct nk_user_font *font, float row_height)
{
/* find the x/y location of a character, and remember info about the previous
* row in case we get a move-up event (for page up, we'll have to rescan) */
struct nk_text_edit_row r;
int prev_start = 0;
int z = state->string.len;
int i=0, first;
nk_zero_struct(r);
if (n == z) {
/* if it's at the end, then find the last line -- simpler than trying to
explicitly handle this case in the regular code */
nk_textedit_layout_row(&r, state, 0, row_height, font);
if (single_line) {
find->first_char = 0;
find->length = z;
} else {
while (i < z) {
prev_start = i;
i += r.num_chars;
nk_textedit_layout_row(&r, state, i, row_height, font);
}
find->first_char = i;
find->length = r.num_chars;
}
find->x = r.x1;
find->y = r.ymin;
find->height = r.ymax - r.ymin;
find->prev_first = prev_start;
return;
}
/* search rows to find the one that straddles character n */
find->y = 0;
for(;;) {
nk_textedit_layout_row(&r, state, i, row_height, font);
if (n < i + r.num_chars) break;
prev_start = i;
i += r.num_chars;
find->y += r.baseline_y_delta;
}
find->first_char = first = i;
find->length = r.num_chars;
find->height = r.ymax - r.ymin;
find->prev_first = prev_start;
/* now scan to find xpos */
find->x = r.x0;
for (i=0; first+i < n; ++i)
find->x += nk_textedit_get_width(state, first, i, font);
}
NK_INTERN void
nk_textedit_clamp(struct nk_text_edit *state)
{
/* make the selection/cursor state valid if client altered the string */
int n = state->string.len;
if (NK_TEXT_HAS_SELECTION(state)) {
if (state->select_start > n) state->select_start = n;
if (state->select_end > n) state->select_end = n;
/* if clamping forced them to be equal, move the cursor to match */
if (state->select_start == state->select_end)
state->cursor = state->select_start;
}
if (state->cursor > n) state->cursor = n;
}
NK_API void
nk_textedit_delete(struct nk_text_edit *state, int where, int len)
{
/* delete characters while updating undo */
nk_textedit_makeundo_delete(state, where, len);
nk_str_delete_runes(&state->string, where, len);
state->has_preferred_x = 0;
}
NK_API void
nk_textedit_delete_selection(struct nk_text_edit *state)
{
/* delete the section */
nk_textedit_clamp(state);
if (NK_TEXT_HAS_SELECTION(state)) {
if (state->select_start < state->select_end) {
nk_textedit_delete(state, state->select_start,
state->select_end - state->select_start);
state->select_end = state->cursor = state->select_start;
} else {
nk_textedit_delete(state, state->select_end,
state->select_start - state->select_end);
state->select_start = state->cursor = state->select_end;
}
state->has_preferred_x = 0;
}
}
NK_INTERN void
nk_textedit_sortselection(struct nk_text_edit *state)
{
/* canonicalize the selection so start <= end */
if (state->select_end < state->select_start) {
int temp = state->select_end;
state->select_end = state->select_start;
state->select_start = temp;
}
}
NK_INTERN void
nk_textedit_move_to_first(struct nk_text_edit *state)
{
/* move cursor to first character of selection */
if (NK_TEXT_HAS_SELECTION(state)) {
nk_textedit_sortselection(state);
state->cursor = state->select_start;
state->select_end = state->select_start;
state->has_preferred_x = 0;
}
}
NK_INTERN void
nk_textedit_move_to_last(struct nk_text_edit *state)
{
/* move cursor to last character of selection */
if (NK_TEXT_HAS_SELECTION(state)) {
nk_textedit_sortselection(state);
nk_textedit_clamp(state);
state->cursor = state->select_end;
state->select_start = state->select_end;
state->has_preferred_x = 0;
}
}
NK_INTERN int
nk_is_word_boundary( struct nk_text_edit *state, int idx)
{
int len;
nk_rune c;
if (idx <= 0) return 1;
if (!nk_str_at_rune(&state->string, idx, &c, &len)) return 1;
return (c == ' ' || c == '\t' ||c == 0x3000 || c == ',' || c == ';' ||
c == '(' || c == ')' || c == '{' || c == '}' || c == '[' || c == ']' ||
c == '|');
}
NK_INTERN int
nk_textedit_move_to_word_previous(struct nk_text_edit *state)
{
int c = state->cursor - 1;
while( c >= 0 && !nk_is_word_boundary(state, c))
--c;
if( c < 0 )
c = 0;
return c;
}
NK_INTERN int
nk_textedit_move_to_word_next(struct nk_text_edit *state)
{
const int len = state->string.len;
int c = state->cursor+1;
while( c < len && !nk_is_word_boundary(state, c))
++c;
if( c > len )
c = len;
return c;
}
NK_INTERN void
nk_textedit_prep_selection_at_cursor(struct nk_text_edit *state)
{
/* update selection and cursor to match each other */
if (!NK_TEXT_HAS_SELECTION(state))
state->select_start = state->select_end = state->cursor;
else state->cursor = state->select_end;
}
NK_API int
nk_textedit_cut(struct nk_text_edit *state)
{
/* API cut: delete selection */
if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
return 0;
if (NK_TEXT_HAS_SELECTION(state)) {
nk_textedit_delete_selection(state); /* implicitly clamps */
state->has_preferred_x = 0;
return 1;
}
return 0;
}
NK_API int
nk_textedit_paste(struct nk_text_edit *state, char const *ctext, int len)
{
/* API paste: replace existing selection with passed-in text */
int glyphs;
const char *text = (const char *) ctext;
if (state->mode == NK_TEXT_EDIT_MODE_VIEW) return 0;
/* if there's a selection, the paste should delete it */
nk_textedit_clamp(state);
nk_textedit_delete_selection(state);
/* try to insert the characters */
glyphs = nk_utf_len(ctext, len);
if (nk_str_insert_text_char(&state->string, state->cursor, text, len)) {
nk_textedit_makeundo_insert(state, state->cursor, glyphs);
state->cursor += len;
state->has_preferred_x = 0;
return 1;
}
/* remove the undo since we didn't actually insert the characters */
if (state->undo.undo_point)
--state->undo.undo_point;
return 0;
}
NK_API void
nk_textedit_text(struct nk_text_edit *state, const char *text, int total_len)
{
nk_rune unicode;
int glyph_len;
int text_len = 0;
NK_ASSERT(state);
NK_ASSERT(text);
if (!text || !total_len || state->mode == NK_TEXT_EDIT_MODE_VIEW) return;
glyph_len = nk_utf_decode(text, &unicode, total_len);
while ((text_len < total_len) && glyph_len)
{
/* don't insert a backward delete, just process the event */
if (unicode == 127) goto next;
/* can't add newline in single-line mode */
if (unicode == '\n' && state->single_line) goto next;
/* filter incoming text */
if (state->filter && !state->filter(state, unicode)) goto next;
if (!NK_TEXT_HAS_SELECTION(state) &&
state->cursor < state->string.len)
{
if (state->mode == NK_TEXT_EDIT_MODE_REPLACE) {
nk_textedit_makeundo_replace(state, state->cursor, 1, 1);
nk_str_delete_runes(&state->string, state->cursor, 1);
}
if (nk_str_insert_text_utf8(&state->string, state->cursor,
text+text_len, 1))
{
++state->cursor;
state->has_preferred_x = 0;
}
} else {
nk_textedit_delete_selection(state); /* implicitly clamps */
if (nk_str_insert_text_utf8(&state->string, state->cursor,
text+text_len, 1))
{
nk_textedit_makeundo_insert(state, state->cursor, 1);
++state->cursor;
state->has_preferred_x = 0;
}
}
next:
text_len += glyph_len;
glyph_len = nk_utf_decode(text + text_len, &unicode, total_len-text_len);
}
}
NK_LIB void
nk_textedit_key(struct nk_text_edit *state, enum nk_keys key, int shift_mod,
const struct nk_user_font *font, float row_height)
{
retry:
switch (key)
{
case NK_KEY_NONE:
case NK_KEY_CTRL:
case NK_KEY_ENTER:
case NK_KEY_SHIFT:
case NK_KEY_TAB:
case NK_KEY_COPY:
case NK_KEY_CUT:
case NK_KEY_PASTE:
case NK_KEY_MAX:
default: break;
case NK_KEY_TEXT_UNDO:
nk_textedit_undo(state);
state->has_preferred_x = 0;
break;
case NK_KEY_TEXT_REDO:
nk_textedit_redo(state);
state->has_preferred_x = 0;
break;
case NK_KEY_TEXT_SELECT_ALL:
nk_textedit_select_all(state);
state->has_preferred_x = 0;
break;
case NK_KEY_TEXT_INSERT_MODE:
if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
state->mode = NK_TEXT_EDIT_MODE_INSERT;
break;
case NK_KEY_TEXT_REPLACE_MODE:
if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
state->mode = NK_TEXT_EDIT_MODE_REPLACE;
break;
case NK_KEY_TEXT_RESET_MODE:
if (state->mode == NK_TEXT_EDIT_MODE_INSERT ||
state->mode == NK_TEXT_EDIT_MODE_REPLACE)
state->mode = NK_TEXT_EDIT_MODE_VIEW;
break;
case NK_KEY_LEFT:
if (shift_mod) {
nk_textedit_clamp(state);
nk_textedit_prep_selection_at_cursor(state);
/* move selection left */
if (state->select_end > 0)
--state->select_end;
state->cursor = state->select_end;
state->has_preferred_x = 0;
} else {
/* if currently there's a selection,
* move cursor to start of selection */
if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_move_to_first(state);
else if (state->cursor > 0)
--state->cursor;
state->has_preferred_x = 0;
} break;
case NK_KEY_RIGHT:
if (shift_mod) {
nk_textedit_prep_selection_at_cursor(state);
/* move selection right */
++state->select_end;
nk_textedit_clamp(state);
state->cursor = state->select_end;
state->has_preferred_x = 0;
} else {
/* if currently there's a selection,
* move cursor to end of selection */
if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_move_to_last(state);
else ++state->cursor;
nk_textedit_clamp(state);
state->has_preferred_x = 0;
} break;
case NK_KEY_TEXT_WORD_LEFT:
if (shift_mod) {
if( !NK_TEXT_HAS_SELECTION( state ) )
nk_textedit_prep_selection_at_cursor(state);
state->cursor = nk_textedit_move_to_word_previous(state);
state->select_end = state->cursor;
nk_textedit_clamp(state );
} else {
if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_move_to_first(state);
else {
state->cursor = nk_textedit_move_to_word_previous(state);
nk_textedit_clamp(state );
}
} break;
case NK_KEY_TEXT_WORD_RIGHT:
if (shift_mod) {
if( !NK_TEXT_HAS_SELECTION( state ) )
nk_textedit_prep_selection_at_cursor(state);
state->cursor = nk_textedit_move_to_word_next(state);
state->select_end = state->cursor;
nk_textedit_clamp(state);
} else {
if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_move_to_last(state);
else {
state->cursor = nk_textedit_move_to_word_next(state);
nk_textedit_clamp(state );
}
} break;
case NK_KEY_DOWN: {
struct nk_text_find find;
struct nk_text_edit_row row;
int i, sel = shift_mod;
if (state->single_line) {
/* on windows, up&down in single-line behave like left&right */
key = NK_KEY_RIGHT;
goto retry;
}
if (sel)
nk_textedit_prep_selection_at_cursor(state);
else if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_move_to_last(state);
/* compute current position of cursor point */
nk_textedit_clamp(state);
nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
font, row_height);
/* now find character position down a row */
if (find.length)
{
float x;
float goal_x = state->has_preferred_x ? state->preferred_x : find.x;
int start = find.first_char + find.length;
state->cursor = start;
nk_textedit_layout_row(&row, state, state->cursor, row_height, font);
x = row.x0;
for (i=0; i < row.num_chars && x < row.x1; ++i) {
float dx = nk_textedit_get_width(state, start, i, font);
x += dx;
if (x > goal_x)
break;
++state->cursor;
}
nk_textedit_clamp(state);
state->has_preferred_x = 1;
state->preferred_x = goal_x;
if (sel)
state->select_end = state->cursor;
}
} break;
case NK_KEY_UP: {
struct nk_text_find find;
struct nk_text_edit_row row;
int i, sel = shift_mod;
if (state->single_line) {
/* on windows, up&down become left&right */
key = NK_KEY_LEFT;
goto retry;
}
if (sel)
nk_textedit_prep_selection_at_cursor(state);
else if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_move_to_first(state);
/* compute current position of cursor point */
nk_textedit_clamp(state);
nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
font, row_height);
/* can only go up if there's a previous row */
if (find.prev_first != find.first_char) {
/* now find character position up a row */
float x;
float goal_x = state->has_preferred_x ? state->preferred_x : find.x;
state->cursor = find.prev_first;
nk_textedit_layout_row(&row, state, state->cursor, row_height, font);
x = row.x0;
for (i=0; i < row.num_chars && x < row.x1; ++i) {
float dx = nk_textedit_get_width(state, find.prev_first, i, font);
x += dx;
if (x > goal_x)
break;
++state->cursor;
}
nk_textedit_clamp(state);
state->has_preferred_x = 1;
state->preferred_x = goal_x;
if (sel) state->select_end = state->cursor;
}
} break;
case NK_KEY_DEL:
if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
break;
if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_delete_selection(state);
else {
int n = state->string.len;
if (state->cursor < n)
nk_textedit_delete(state, state->cursor, 1);
}
state->has_preferred_x = 0;
break;
case NK_KEY_BACKSPACE:
if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
break;
if (NK_TEXT_HAS_SELECTION(state))
nk_textedit_delete_selection(state);
else {
nk_textedit_clamp(state);
if (state->cursor > 0) {
nk_textedit_delete(state, state->cursor-1, 1);
--state->cursor;
}
}
state->has_preferred_x = 0;
break;
case NK_KEY_TEXT_START:
if (shift_mod) {
nk_textedit_prep_selection_at_cursor(state);
state->cursor = state->select_end = 0;
state->has_preferred_x = 0;
} else {
state->cursor = state->select_start = state->select_end = 0;
state->has_preferred_x = 0;
}
break;
case NK_KEY_TEXT_END:
if (shift_mod) {
nk_textedit_prep_selection_at_cursor(state);
state->cursor = state->select_end = state->string.len;
state->has_preferred_x = 0;
} else {
state->cursor = state->string.len;
state->select_start = state->select_end = 0;
state->has_preferred_x = 0;
}
break;
case NK_KEY_TEXT_LINE_START: {
if (shift_mod) {
struct nk_text_find find;
nk_textedit_clamp(state);
nk_textedit_prep_selection_at_cursor(state);
if (state->string.len && state->cursor == state->string.len)
--state->cursor;
nk_textedit_find_charpos(&find, state,state->cursor, state->single_line,
font, row_height);
state->cursor = state->select_end = find.first_char;
state->has_preferred_x = 0;
} else {
struct nk_text_find find;
if (state->string.len && state->cursor == state->string.len)
--state->cursor;
nk_textedit_clamp(state);
nk_textedit_move_to_first(state);
nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
font, row_height);
state->cursor = find.first_char;
state->has_preferred_x = 0;
}
} break;
case NK_KEY_TEXT_LINE_END: {
if (shift_mod) {
struct nk_text_find find;
nk_textedit_clamp(state);
nk_textedit_prep_selection_at_cursor(state);
nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
font, row_height);
state->has_preferred_x = 0;
state->cursor = find.first_char + find.length;
if (find.length > 0 && nk_str_rune_at(&state->string, state->cursor-1) == '\n')
--state->cursor;
state->select_end = state->cursor;
} else {
struct nk_text_find find;
nk_textedit_clamp(state);
nk_textedit_move_to_first(state);
nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
font, row_height);
state->has_preferred_x = 0;
state->cursor = find.first_char + find.length;
if (find.length > 0 && nk_str_rune_at(&state->string, state->cursor-1) == '\n')
--state->cursor;
}} break;
}
}
NK_INTERN void
nk_textedit_flush_redo(struct nk_text_undo_state *state)
{
state->redo_point = NK_TEXTEDIT_UNDOSTATECOUNT;
state->redo_char_point = NK_TEXTEDIT_UNDOCHARCOUNT;
}
NK_INTERN void
nk_textedit_discard_undo(struct nk_text_undo_state *state)
{
/* discard the oldest entry in the undo list */
if (state->undo_point > 0) {
/* if the 0th undo state has characters, clean those up */
if (state->undo_rec[0].char_storage >= 0) {
int n = state->undo_rec[0].insert_length, i;
/* delete n characters from all other records */
state->undo_char_point = (short)(state->undo_char_point - n);
NK_MEMCPY(state->undo_char, state->undo_char + n,
(nk_size)state->undo_char_point*sizeof(nk_rune));
for (i=0; i < state->undo_point; ++i) {
if (state->undo_rec[i].char_storage >= 0)
state->undo_rec[i].char_storage = (short)
(state->undo_rec[i].char_storage - n);
}
}
--state->undo_point;
NK_MEMCPY(state->undo_rec, state->undo_rec+1,
(nk_size)((nk_size)state->undo_point * sizeof(state->undo_rec[0])));
}
}
NK_INTERN void
nk_textedit_discard_redo(struct nk_text_undo_state *state)
{
/* discard the oldest entry in the redo list--it's bad if this
ever happens, but because undo & redo have to store the actual
characters in different cases, the redo character buffer can
fill up even though the undo buffer didn't */
nk_size num;
int k = NK_TEXTEDIT_UNDOSTATECOUNT-1;
if (state->redo_point <= k) {
/* if the k'th undo state has characters, clean those up */
if (state->undo_rec[k].char_storage >= 0) {
int n = state->undo_rec[k].insert_length, i;
/* delete n characters from all other records */
state->redo_char_point = (short)(state->redo_char_point + n);
num = (nk_size)(NK_TEXTEDIT_UNDOCHARCOUNT - state->redo_char_point);
NK_MEMCPY(state->undo_char + state->redo_char_point,
state->undo_char + state->redo_char_point-n, num * sizeof(char));
for (i = state->redo_point; i < k; ++i) {
if (state->undo_rec[i].char_storage >= 0) {
state->undo_rec[i].char_storage = (short)
(state->undo_rec[i].char_storage + n);
}
}
}
++state->redo_point;
num = (nk_size)(NK_TEXTEDIT_UNDOSTATECOUNT - state->redo_point);
if (num) NK_MEMCPY(state->undo_rec + state->redo_point-1,
state->undo_rec + state->redo_point, num * sizeof(state->undo_rec[0]));
}
}
NK_INTERN struct nk_text_undo_record*
nk_textedit_create_undo_record(struct nk_text_undo_state *state, int numchars)
{
/* any time we create a new undo record, we discard redo*/
nk_textedit_flush_redo(state);
/* if we have no free records, we have to make room,
* by sliding the existing records down */
if (state->undo_point == NK_TEXTEDIT_UNDOSTATECOUNT)
nk_textedit_discard_undo(state);
/* if the characters to store won't possibly fit in the buffer,
* we can't undo */
if (numchars > NK_TEXTEDIT_UNDOCHARCOUNT) {
state->undo_point = 0;
state->undo_char_point = 0;
return 0;
}
/* if we don't have enough free characters in the buffer,
* we have to make room */
while (state->undo_char_point + numchars > NK_TEXTEDIT_UNDOCHARCOUNT)
nk_textedit_discard_undo(state);
return &state->undo_rec[state->undo_point++];
}
NK_INTERN nk_rune*
nk_textedit_createundo(struct nk_text_undo_state *state, int pos,
int insert_len, int delete_len)
{
struct nk_text_undo_record *r = nk_textedit_create_undo_record(state, insert_len);
if (r == 0)
return 0;
r->where = pos;
r->insert_length = (short) insert_len;
r->delete_length = (short) delete_len;
if (insert_len == 0) {
r->char_storage = -1;
return 0;
} else {
r->char_storage = state->undo_char_point;
state->undo_char_point = (short)(state->undo_char_point + insert_len);
return &state->undo_char[r->char_storage];
}
}
NK_API void
nk_textedit_undo(struct nk_text_edit *state)
{
struct nk_text_undo_state *s = &state->undo;
struct nk_text_undo_record u, *r;
if (s->undo_point == 0)
return;
/* we need to do two things: apply the undo record, and create a redo record */
u = s->undo_rec[s->undo_point-1];
r = &s->undo_rec[s->redo_point-1];
r->char_storage = -1;
r->insert_length = u.delete_length;
r->delete_length = u.insert_length;
r->where = u.where;
if (u.delete_length)
{
/* if the undo record says to delete characters, then the redo record will
need to re-insert the characters that get deleted, so we need to store
them.
there are three cases:
- there's enough room to store the characters
- characters stored for *redoing* don't leave room for redo
- characters stored for *undoing* don't leave room for redo
if the last is true, we have to bail */
if (s->undo_char_point + u.delete_length >= NK_TEXTEDIT_UNDOCHARCOUNT) {
/* the undo records take up too much character space; there's no space
* to store the redo characters */
r->insert_length = 0;
} else {
int i;
/* there's definitely room to store the characters eventually */
while (s->undo_char_point + u.delete_length > s->redo_char_point) {
/* there's currently not enough room, so discard a redo record */
nk_textedit_discard_redo(s);
/* should never happen: */
if (s->redo_point == NK_TEXTEDIT_UNDOSTATECOUNT)
return;
}
r = &s->undo_rec[s->redo_point-1];
r->char_storage = (short)(s->redo_char_point - u.delete_length);
s->redo_char_point = (short)(s->redo_char_point - u.delete_length);
/* now save the characters */
for (i=0; i < u.delete_length; ++i)
s->undo_char[r->char_storage + i] =
nk_str_rune_at(&state->string, u.where + i);
}
/* now we can carry out the deletion */
nk_str_delete_runes(&state->string, u.where, u.delete_length);
}
/* check type of recorded action: */
if (u.insert_length) {
/* easy case: was a deletion, so we need to insert n characters */
nk_str_insert_text_runes(&state->string, u.where,
&s->undo_char[u.char_storage], u.insert_length);
s->undo_char_point = (short)(s->undo_char_point - u.insert_length);
}
state->cursor = (short)(u.where + u.insert_length);
s->undo_point--;
s->redo_point--;
}
NK_API void
nk_textedit_redo(struct nk_text_edit *state)
{
struct nk_text_undo_state *s = &state->undo;
struct nk_text_undo_record *u, r;
if (s->redo_point == NK_TEXTEDIT_UNDOSTATECOUNT)
return;
/* we need to do two things: apply the redo record, and create an undo record */
u = &s->undo_rec[s->undo_point];
r = s->undo_rec[s->redo_point];
/* we KNOW there must be room for the undo record, because the redo record
was derived from an undo record */
u->delete_length = r.insert_length;
u->insert_length = r.delete_length;
u->where = r.where;
u->char_storage = -1;
if (r.delete_length) {
/* the redo record requires us to delete characters, so the undo record
needs to store the characters */
if (s->undo_char_point + u->insert_length > s->redo_char_point) {
u->insert_length = 0;
u->delete_length = 0;
} else {
int i;
u->char_storage = s->undo_char_point;
s->undo_char_point = (short)(s->undo_char_point + u->insert_length);
/* now save the characters */
for (i=0; i < u->insert_length; ++i) {
s->undo_char[u->char_storage + i] =
nk_str_rune_at(&state->string, u->where + i);
}
}
nk_str_delete_runes(&state->string, r.where, r.delete_length);
}
if (r.insert_length) {
/* easy case: need to insert n characters */
nk_str_insert_text_runes(&state->string, r.where,
&s->undo_char[r.char_storage], r.insert_length);
}
state->cursor = r.where + r.insert_length;
s->undo_point++;
s->redo_point++;
}
NK_INTERN void
nk_textedit_makeundo_insert(struct nk_text_edit *state, int where, int length)
{
nk_textedit_createundo(&state->undo, where, 0, length);
}
NK_INTERN void
nk_textedit_makeundo_delete(struct nk_text_edit *state, int where, int length)
{
int i;
nk_rune *p = nk_textedit_createundo(&state->undo, where, length, 0);
if (p) {
for (i=0; i < length; ++i)
p[i] = nk_str_rune_at(&state->string, where+i);
}
}
NK_INTERN void
nk_textedit_makeundo_replace(struct nk_text_edit *state, int where,
int old_length, int new_length)
{
int i;
nk_rune *p = nk_textedit_createundo(&state->undo, where, old_length, new_length);
if (p) {
for (i=0; i < old_length; ++i)
p[i] = nk_str_rune_at(&state->string, where+i);
}
}
NK_LIB void
nk_textedit_clear_state(struct nk_text_edit *state, enum nk_text_edit_type type,
nk_plugin_filter filter)
{
/* reset the state to default */
state->undo.undo_point = 0;
state->undo.undo_char_point = 0;
state->undo.redo_point = NK_TEXTEDIT_UNDOSTATECOUNT;
state->undo.redo_char_point = NK_TEXTEDIT_UNDOCHARCOUNT;
state->select_end = state->select_start = 0;
state->cursor = 0;
state->has_preferred_x = 0;
state->preferred_x = 0;
state->cursor_at_end_of_line = 0;
state->initialized = 1;
state->single_line = (unsigned char)(type == NK_TEXT_EDIT_SINGLE_LINE);
state->mode = NK_TEXT_EDIT_MODE_VIEW;
state->filter = filter;
state->scrollbar = nk_vec2(0,0);
}
NK_API void
nk_textedit_init_fixed(struct nk_text_edit *state, void *memory, nk_size size)
{
NK_ASSERT(state);
NK_ASSERT(memory);
if (!state || !memory || !size) return;
NK_MEMSET(state, 0, sizeof(struct nk_text_edit));
nk_textedit_clear_state(state, NK_TEXT_EDIT_SINGLE_LINE, 0);
nk_str_init_fixed(&state->string, memory, size);
}
NK_API void
nk_textedit_init(struct nk_text_edit *state, struct nk_allocator *alloc, nk_size size)
{
NK_ASSERT(state);
NK_ASSERT(alloc);
if (!state || !alloc) return;
NK_MEMSET(state, 0, sizeof(struct nk_text_edit));
nk_textedit_clear_state(state, NK_TEXT_EDIT_SINGLE_LINE, 0);
nk_str_init(&state->string, alloc, size);
}
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void
nk_textedit_init_default(struct nk_text_edit *state)
{
NK_ASSERT(state);
if (!state) return;
NK_MEMSET(state, 0, sizeof(struct nk_text_edit));
nk_textedit_clear_state(state, NK_TEXT_EDIT_SINGLE_LINE, 0);
nk_str_init_default(&state->string);
}
#endif
NK_API void
nk_textedit_select_all(struct nk_text_edit *state)
{
NK_ASSERT(state);
state->select_start = 0;
state->select_end = state->string.len;
}
NK_API void
nk_textedit_free(struct nk_text_edit *state)
{
NK_ASSERT(state);
if (!state) return;
nk_str_free(&state->string);
}
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