Memory leak in Input_ #716

FL/Fl_Input_.H

@@ -384,9 +384,15 @@ public:
   /* Undo previous changes to the text buffer. */
   int undo();
 
+  /* Return true if the last operation can be undone. */
+  bool can_undo();
+
   /* Redo previous undo operations. */
   int redo();
 
+  /* Return true if there is a redo action in the list. */
+  bool can_redo();
+
   /* Copy the yank buffer to the clipboard. */
   int copy_cuts();
 

src/Fl_Input_.cxx

@@ -88,6 +88,10 @@ public:
     clear();
   }
 
+  int size() const {
+    return list_size_;
+  }
+
   void push(Fl_Input_Undo_Action* action) {
     if (list_size_ == list_capacity_) {
       list_capacity_ += 25;
@@ -1066,6 +1070,15 @@ int Fl_Input_::undo() {
   return 1;
 }
 
+/**
+ Check if the last operation can be undone.
+
+ \return true if the widget can unod the last change
+ */
+bool Fl_Input_::can_undo() {
+  return (undo_->undocut || undo_->undoinsert);
+}
+
 /**
  Redo previous undo operation.
 
@@ -1080,6 +1093,8 @@ int Fl_Input_::redo() {
 
   if (undo_->undocut || undo_->undoinsert)
     undo_list_->push(undo_);
+  else
+    delete undo_;
   undo_ = redo_action;
 
   int ret = apply_undo();
@@ -1088,6 +1103,15 @@ int Fl_Input_::redo() {
   return ret;
 }
 
+/**
+ Check if there is a redo action available.
+
+ \return true if the widget can redo the last undo action
+ */
+bool Fl_Input_::can_redo() {
+  return (redo_list_->size() > 0);
+}
+
 /**
   Copies the \e yank buffer to the clipboard.