FLUID: Add Synchronized Resize. #1055

1 files changed, 15 insertions, 1 deletions

diff --git a/fluid/undo.cxx b/fluid/undo.cxx
index 0d5cb4d9b..31b412878 100644
--- a/fluid/undo.cxx
+++ b/fluid/undo.cxx
@@ -1,7 +1,7 @@
 //
 // FLUID undo support for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2021 by Bill Spitzak and others.
+// Copyright 1998-2024 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
@@ -53,6 +53,7 @@ int undo_last = 0;                      // Last undo level in buffer
 int undo_max = 0;                       // Maximum undo level used
 int undo_save = -1;                     // Last undo level that was saved
 static int undo_paused = 0;             // Undo checkpointing paused?
+int undo_once_type = 0;                 // Suspend further undos of the same type
 
 
 // Return the undo filename.
@@ -80,6 +81,7 @@ static char *undo_filename(int level) {
 void redo_cb(Fl_Widget *, void *) {
   // int undo_item = main_menubar->find_index(undo_cb);
   // int redo_item = main_menubar->find_index(redo_cb);
+  undo_once_type = 0;
 
   if (undo_current >= undo_last) {
     fl_beep();
@@ -120,6 +122,7 @@ void redo_cb(Fl_Widget *, void *) {
 void undo_cb(Fl_Widget *, void *) {
   // int undo_item = main_menubar->find_index(undo_cb);
   // int redo_item = main_menubar->find_index(redo_cb);
+  undo_once_type = 0;
 
   if (undo_current <= 0) {
     fl_beep();
@@ -165,6 +168,16 @@ void undo_cb(Fl_Widget *, void *) {
   undo_resume();
 }
 
+void undo_checkpoint_once(int type) {
+  if (undo_paused) return;
+  if (undo_once_type != type) {
+    undo_checkpoint();
+    undo_once_type = type;
+  } else {
+    // do not add more checkpoints for the same undo typw
+  }
+}
+
 // Save current file to undo buffer
 void undo_checkpoint() {
   //  printf("undo_checkpoint(): undo_current=%d, undo_paused=%d, modflag=%d\n",
@@ -175,6 +188,7 @@ void undo_checkpoint() {
 
   // int undo_item = main_menubar->find_index(undo_cb);
   // int redo_item = main_menubar->find_index(redo_cb);
+  undo_once_type = 0;
 
   // Save the current UI to a checkpoint file...
   const char *filename = undo_filename(undo_current);