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fix stb_textedit redo, from omar cornut

pull/538/head
Sean Barrett 2018-01-29 07:23:54 -08:00
parent b969dc38f3
commit 3025377f4a
1 changed files with 11 additions and 7 deletions
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18
stb_textedit.h
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@ -29,7 +29,7 @@
//
// VERSION HISTORY
//
// 1.12 (2018-01-29) user can change STB_TEXTEDIT_KEYTYPE
// 1.12 (2018-01-29) user can change STB_TEXTEDIT_KEYTYPE, fix redo to avoid crash
// 1.11 (2017-03-03) fix HOME on last line, dragging off single-line textfield
// 1.10 (2016-10-25) supress warnings about casting away const with -Wcast-qual
// 1.9 (2016-08-27) customizable move-by-word
@ -1119,15 +1119,18 @@ static void stb_textedit_discard_redo(StbUndoState *state)
// 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
// move the remaining redo character data to the end of the buffer
state->redo_char_point = state->redo_char_point + (short) n; // vsnet05
STB_TEXTEDIT_memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (size_t) ((STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE)));
STB_TEXTEDIT_memmove(state->undo_char + state->redo_char_point, state->undo_char + state->redo_char_point-n, (size_t) ((STB_TEXTEDIT_UNDOCHARCOUNT - state->redo_char_point)*sizeof(STB_TEXTEDIT_CHARTYPE)));
// adjust the position of all the other records to account for above memmove
for (i=state->redo_point; i < k; ++i)
if (state->undo_rec[i].char_storage >= 0)
state->undo_rec[i].char_storage = state->undo_rec[i].char_storage + (short) n; // vsnet05
state->undo_rec[i].char_storage += (short) n; // vsnet05
}
// now move all the redo records towards the end of the buffer; the first one is at 'redo_point'
STB_TEXTEDIT_memmove(state->undo_rec + state->redo_point+1, state->undo_rec + state->redo_point, (size_t) ((STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0])));
// now move redo_point to point to the new one
++state->redo_point;
STB_TEXTEDIT_memmove(state->undo_rec + state->redo_point-1, state->undo_rec + state->redo_point, (size_t) ((STB_TEXTEDIT_UNDOSTATECOUNT - state->redo_point)*sizeof(state->undo_rec[0])));
}
}
@ -1210,11 +1213,11 @@ static void stb_text_undo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
// 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
stb_textedit_discard_redo(s);
// should never happen:
if (s->redo_point == STB_TEXTEDIT_UNDOSTATECOUNT)
return;
// there's currently not enough room, so discard a redo record
stb_textedit_discard_redo(s);
}
r = &s->undo_rec[s->redo_point-1];
@ -1285,6 +1288,7 @@ static void stb_text_redo(STB_TEXTEDIT_STRING *str, STB_TexteditState *state)
if (r.insert_length) {
// easy case: need to insert n characters
STB_TEXTEDIT_INSERTCHARS(str, r.where, &s->undo_char[r.char_storage], r.insert_length);
s->redo_char_point += r.insert_length;
}
state->cursor = r.where + r.insert_length;