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-rw-r--r--src/Fl_Input.cxx18
-rw-r--r--src/Fl_Input_.cxx7
-rw-r--r--src/Fl_Text_Buffer.cxx16
-rw-r--r--src/Fl_Text_Display.cxx5
-rw-r--r--src/fl_utf8.cxx60
5 files changed, 84 insertions, 22 deletions
diff --git a/src/Fl_Input.cxx b/src/Fl_Input.cxx
index fd66d8f24..bd317ad09 100644
--- a/src/Fl_Input.cxx
+++ b/src/Fl_Input.cxx
@@ -1,7 +1,7 @@
//
// Input widget for the Fast Light Tool Kit (FLTK).
//
-// Copyright 1998-2024 by Bill Spitzak and others.
+// Copyright 1998-2026 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
@@ -190,14 +190,20 @@ int Fl_Input::kf_delete_eol() {
int Fl_Input::kf_delete_char_right() {
if (readonly()) { fl_beep(); return 1; }
if (mark() != insert_position()) cut();
- else cut(1);
+ else {
+ const char *next = fl_utf8_next_composed_char(value() + insert_position(), value() + size());
+ replace(insert_position(), next - value(), 0);
+ }
return 1;
}
int Fl_Input::kf_delete_char_left() {
if (readonly()) { fl_beep(); return 1; }
if (mark() != insert_position()) cut();
- else cut(-1);
+ else {
+ const char *before = fl_utf8_previous_composed_char(value() + insert_position(), value());
+ replace(insert_position(), before - value(), 0);
+ }
return 1;
}
@@ -225,7 +231,8 @@ int Fl_Input::kf_clear_eol() {
// If OPTION_ARROW_FOCUS is disabled, return 1 to prevent focus navigation.
//
int Fl_Input::kf_move_char_left() {
- int i = shift_position(insert_position()-1) + NORMAL_INPUT_MOVE;
+ const char *before = fl_utf8_previous_composed_char(value() + insert_position(), value());
+ int i = shift_position(before - value()) + NORMAL_INPUT_MOVE;
return Fl::option(Fl::OPTION_ARROW_FOCUS) ? i : 1;
}
@@ -233,7 +240,8 @@ int Fl_Input::kf_move_char_left() {
// If OPTION_ARROW_FOCUS is disabled, return 1 to prevent focus navigation.
//
int Fl_Input::kf_move_char_right() {
- int i = shift_position(insert_position()+1) + NORMAL_INPUT_MOVE;
+ const char *next = fl_utf8_next_composed_char(value() + insert_position(), value() + size());
+ int i = shift_position(next - value()) + NORMAL_INPUT_MOVE;
return Fl::option(Fl::OPTION_ARROW_FOCUS) ? i : 1;
}
diff --git a/src/Fl_Input_.cxx b/src/Fl_Input_.cxx
index 18945c242..c052de10d 100644
--- a/src/Fl_Input_.cxx
+++ b/src/Fl_Input_.cxx
@@ -1,7 +1,7 @@
//
// Common input widget routines for the Fast Light Tool Kit (FLTK).
//
-// Copyright 1998-2011 by Bill Spitzak and others.
+// Copyright 1998-2026 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
@@ -658,8 +658,7 @@ void Fl_Input_::handle_mouse(int X, int Y, int /*W*/, int /*H*/, int drag) {
const char *l, *r, *t; double f0 = Fl::event_x()-X+xscroll_;
for (l = p, r = e; l<r; ) {
double f;
- int cw = fl_utf8len((char)l[0]);
- if (cw < 1) cw = 1;
+ int cw = fl_utf8_next_composed_char(l, value() + size()) - l;
t = l+cw;
f = X-xscroll_+expandpos(p, t, buf, 0);
if (f <= Fl::event_x()) {l = t; f0 = Fl::event_x()-f;}
@@ -667,7 +666,7 @@ void Fl_Input_::handle_mouse(int X, int Y, int /*W*/, int /*H*/, int drag) {
}
if (l < e) { // see if closer to character on right:
double f1;
- int cw = fl_utf8len((char)l[0]);
+ int cw = fl_utf8_next_composed_char(l, value() + size()) - l;
if (cw > 0) {
f1 = X-xscroll_+expandpos(p, l + cw, buf, 0) - Fl::event_x();
if (f1 < f0) l = l+cw;
diff --git a/src/Fl_Text_Buffer.cxx b/src/Fl_Text_Buffer.cxx
index c33e36d3a..907a5cce6 100644
--- a/src/Fl_Text_Buffer.cxx
+++ b/src/Fl_Text_Buffer.cxx
@@ -1,5 +1,5 @@
//
-// Copyright 2001-2023 by Bill Spitzak and others.
+// Copyright 2001-2026 by Bill Spitzak and others.
// Original code Copyright Mark Edel. Permission to distribute under
// the LGPL for the FLTK library granted by Mark Edel.
//
@@ -2090,14 +2090,8 @@ int Fl_Text_Buffer::prev_char_clipped(int pos) const
return 0;
IS_UTF8_ALIGNED2(this, (pos))
-
- char c;
- do {
- pos--;
- if (pos==0)
- return 0;
- c = byte_at(pos);
- } while ( (c&0xc0) == 0x80);
+ const char *previous = fl_utf8_previous_composed_char(address(0) + pos, address(0));
+ pos = previous - address(0);
IS_UTF8_ALIGNED2(this, (pos))
return pos;
@@ -2122,8 +2116,8 @@ int Fl_Text_Buffer::prev_char(int pos) const
int Fl_Text_Buffer::next_char(int pos) const
{
IS_UTF8_ALIGNED2(this, (pos))
- int n = fl_utf8len1(byte_at(pos));
- pos += n;
+ const char *next = fl_utf8_next_composed_char(address(0) + pos, address(0) + mLength);
+ pos = next - address(0);
if (pos>=mLength)
return mLength;
IS_UTF8_ALIGNED2(this, (pos))
diff --git a/src/Fl_Text_Display.cxx b/src/Fl_Text_Display.cxx
index 7f14623d6..9e0aacc2f 100644
--- a/src/Fl_Text_Display.cxx
+++ b/src/Fl_Text_Display.cxx
@@ -1,5 +1,5 @@
//
-// Copyright 2001-2022 by Bill Spitzak and others.
+// Copyright 2001-2026 by Bill Spitzak and others.
// Original code Copyright Mark Edel. Permission to distribute under
// the LGPL for the FLTK library granted by Mark Edel.
//
@@ -2263,7 +2263,8 @@ int Fl_Text_Display::find_x(const char *s, int len, int style, int x) const {
int i = 0;
int last_w = 0; // STR #2788
while (i<len) {
- int cl = fl_utf8len1(s[i]);
+ const char *next = fl_utf8_next_composed_char(s + i, s + len);
+ int cl = next - (s+i);
int w = int( string_width(s, i+cl, style) );
if (w>x) {
if (cursor_pos && (w-x < x-last_w)) return i+cl; // STR #2788
diff --git a/src/fl_utf8.cxx b/src/fl_utf8.cxx
index 6a69e0780..df4c6d423 100644
--- a/src/fl_utf8.cxx
+++ b/src/fl_utf8.cxx
@@ -1629,4 +1629,64 @@ unsigned fl_utf8from_mb(char* dst, unsigned dstlen, const char* src, unsigned sr
return Fl::system_driver()->utf8from_mb(dst, dstlen, src, srclen);
}
+
+/**
+ Returns pointer to beginning of next unicode character after potentially composed character.
+ Some unicode characters (example: 👩‍✈️ "woman pilot") are composed of several unicode points. They may pair two successive
+ codepoints with U+200D (zero-width joiner) and may qualify any component with variation selectors or Fitzpatrick emoji modifiers.
+ \param from points to a location within a UTF8 string. If this location is inside the UTF8
+ encoding of a codepoint or is an invalid byte, this function returns \p from + 1.
+ \param end points past last codepoint of the string.
+ \return pointer to start of first codepoint after potentially composed character beginning at \p from.
+ */
+const char *fl_utf8_next_composed_char(const char *from, const char *end) {
+ int skip = fl_utf8len(*from);
+ if (skip == -1) return from + 1;
+ from += skip; // skip 1st codepoint
+ while (from < end) {
+ unsigned u = fl_utf8decode(from, end, NULL);
+ if (u == 0x200D) { // zero-width joiner
+ from += fl_utf8len(*from); // skip joiner
+ from += fl_utf8len(*from); // skip joined codepoint
+ } else if (u >= 0xFE00 && u <= 0xFE0F) { // a variation selector
+ from += fl_utf8len(*from); // skip variation selector
+ } else if (u >= 0x1F3FB && u <= 0x1F3FF) { // EMOJI MODIFIER FITZPATRICK
+ from += fl_utf8len(*from); // skip modifier
+ } else break;
+ }
+ return from;
+}
+
+
+/**
+ Returns pointer to beginning of previous potentially composed character before given unicode character.
+ See fl_utf8_next_composed_char() for a hint about what is a composed unicode character.
+ \param from points to a location within a UTF8 string. If this location is inside the UTF8
+ encoding of a codepoint or is an invalid byte, this function returns \p from - 1.
+ \param begin points to start of first codepoint of the string.
+ \return pointer to start of first potentially composed character before the codepoint beginning at \p from.
+ */
+const char *fl_utf8_previous_composed_char(const char *from, const char *begin) {
+ if (from <= begin || fl_utf8len(*from) == -1) return from - 1;
+ const char *keep = from;
+ from = fl_utf8back(from - 1, begin, NULL);
+ while (from >= begin) {
+ unsigned u = fl_utf8decode(from, keep, NULL);
+ if (u >= 0xFE00 && u <= 0xFE0F) { // a variation selector
+ from = fl_utf8back(from - 1, begin, NULL);
+ } else if (u >= 0x1F3FB && u <= 0x1F3FF) { // EMOJI MODIFIER FITZPATRICK
+ from = fl_utf8back(from - 1, begin, NULL);
+ } else if (from > begin) {
+ keep = fl_utf8back(from - 1, begin, NULL);
+ u = fl_utf8decode(keep, from, NULL);
+ if (u == 0x200D) { // zero-width joiner
+ from = fl_utf8back(keep - 1, begin, NULL);
+ continue;
+ }
+ return from;
+ } else break;
+ }
+ return from;
+}
+
/** @} */
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-08 08:09:34 +0000