From 73d7cbf3d3afa8063a8a19ac84456ab607dc1338 Mon Sep 17 00:00:00 2001
From: mark-summerfield <mark@qtrac.eu>
Date: Sat, 1 Jul 2023 10:31:30 +0100
Subject: [PATCH] Added TextEditor Undo and Redo support.

---
 text.cxx |  8 ++++++++
 text.go  | 15 +++++++++++++++
 text.h   |  4 +++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/text.cxx b/text.cxx
index 949316e..cac10e1 100644
--- a/text.cxx
+++ b/text.cxx
@@ -167,10 +167,18 @@ void go_fltk_TextEditor_paste(Fl_Text_Editor *e) {
   Fl_Text_Editor::kf_paste(0, e);
 }
 
+void go_fltk_TextEditor_redo(Fl_Text_Editor *e) {
+  Fl_Text_Editor::kf_redo(0, e);
+}
+
 void go_fltk_TextEditor_select_all(Fl_Text_Editor *e) {
   Fl_Text_Editor::kf_select_all(0, e);
 }
 
+void go_fltk_TextEditor_undo(Fl_Text_Editor *e) {
+  Fl_Text_Editor::kf_undo(0, e);
+}
+
 // --- Text Buffer ---
 
 void modify_callback_handler(int pos, int nInserted, int nDeleted, int nRestyled, const char *deletedText, void *cbArg) {
diff --git a/text.go b/text.go
index 6e7d179..a9f1b10 100644
--- a/text.go
+++ b/text.go
@@ -432,22 +432,37 @@ func (t *TextEditor) Insert() {
 	C.go_fltk_TextEditor_insert((*C.Fl_Text_Editor)(t.ptr()))
 }
 
+// Cut cuts the selected text from the editor's buffer into the clipboard.
 func (t *TextEditor) Cut() {
 	C.go_fltk_TextEditor_cut((*C.Fl_Text_Editor)(t.ptr()))
 }
 
+// Delete deletes the selected text from the editor's buffer.
 func (t *TextEditor) Delete() {
 	C.go_fltk_TextEditor_delete((*C.Fl_Text_Editor)(t.ptr()))
 }
 
+// Paste pastes the clipboard's text into the editor's buffer at the
+// insertion point.
 func (t *TextEditor) Paste() {
 	C.go_fltk_TextEditor_paste((*C.Fl_Text_Editor)(t.ptr()))
 }
 
+// Redo redoes the last undone edit.
+func (t *TextEditor) Redo() {
+	C.go_fltk_TextEditor_redo((*C.Fl_Text_Editor)(t.ptr()))
+}
+
+// SelectAll selects all the editor's text.
 func (t *TextEditor) SelectAll() {
 	C.go_fltk_TextEditor_select_all((*C.Fl_Text_Editor)(t.ptr()))
 }
 
+// Undo undoes the last edit.
+func (t *TextEditor) Undo() {
+	C.go_fltk_TextEditor_undo((*C.Fl_Text_Editor)(t.ptr()))
+}
+
 // NewTextEditor returns a TextEditor.
 //
 // Example:
diff --git a/text.h b/text.h
index 73b472f..a533977 100644
--- a/text.h
+++ b/text.h
@@ -18,7 +18,9 @@ extern "C" {
   extern void go_fltk_TextEditor_cut(Fl_Text_Editor *e);
   extern void go_fltk_TextEditor_delete(Fl_Text_Editor *e);
   extern void go_fltk_TextEditor_paste(Fl_Text_Editor *e);
+  extern void go_fltk_TextEditor_redo(Fl_Text_Editor *e);
   extern void go_fltk_TextEditor_select_all(Fl_Text_Editor *e);
+  extern void go_fltk_TextEditor_undo(Fl_Text_Editor *e);
 
   extern GText_Display *go_fltk_new_TextDisplay(int x, int y, int w, int h, const char *text);
   extern void go_fltk_TextDisplay_set_buffer(Fl_Text_Display *d, Fl_Text_Buffer *buf);
@@ -30,7 +32,7 @@ extern "C" {
   extern int go_fltk_TextDisplay_move_up(Fl_Text_Display *d);
   extern int go_fltk_TextDisplay_move_down(Fl_Text_Display *d);
   extern void go_fltk_TextDisplay_show_insert_position(Fl_Text_Display *d);
-  extern void go_fltk_TextDisplay_hide_cursor(Fl_Text_Display *d);  
+  extern void go_fltk_TextDisplay_hide_cursor(Fl_Text_Display *d);
   extern unsigned int go_fltk_TextDisplay_text_color(Fl_Text_Display *d);
   extern void go_fltk_TextDisplay_set_text_color(Fl_Text_Display* d, unsigned int color);
   extern int go_fltk_TextDisplay_text_font(Fl_Text_Display *d);