Fix crash when selecting text with changes

[lyx.git] / src / Undo.h

diff --git a/src/Undo.h b/src/Undo.h
index 95514ab0b259a1e5685a1cbe4362301b7cff4bc4..6f6cca6e90e968ee46c87d591a27fe97f82fd0a4 100644 (file)
--- a/src/Undo.h
+++ b/src/Undo.h
@@ -47,6 +47,9 @@ enum UndoKind {
 
 class Undo
 {
+       /// noncopyable
+       Undo(Undo const &);
+       void operator=(Undo const &);
 public:
 
        Undo(Buffer &);
@@ -80,12 +83,21 @@ public:
         *  a single step. This means you can add a group whenever you are not sure.
         */
        void beginUndoGroup();
-
+       /// open a new group as above and specify a cursor to set as cur_before
+       /// of the group's undo elements.
+       /**
+        * This cursor takes precedence over what is passed to recordUndo.
+        * In the case of nested groups, only the first cur_before is
+        * taken into account. The cursor is reset at the end of the
+        * top-level group.
+        */
+       void beginUndoGroup(CursorData const & cur_before);
        /// end the current undo group.
        void endUndoGroup();
-
        /// end the current undo group and set UndoElement::cur_after if necessary.
-       void endUndoGroup(CursorData const &);
+       void endUndoGroup(CursorData const & cur_after);
+       /// return true if an undo group is open and contains at least one element
+       bool activeUndoGroup() const;
 
        /// The general case: record undo information for an arbitrary range.
        /**
@@ -117,6 +129,29 @@ private:
 };
 
 
+/** Helper class to simplify the use of undo groups across several buffers.
+ *
+ *  The undo group is created when the object is instanciated; it is
+ *  then ended as the object goes out of scope or the buffer is reset
+ *  (see below)
+ */
+class UndoGroupHelper {
+public:
+       UndoGroupHelper(Buffer * buf = 0);
+
+       ~UndoGroupHelper();
+
+       /** Close the current undo group if necessary and create a new one
+        * for buffer \c buf.
+        */
+       void resetBuffer(Buffer * buf);
+
+private:
+       class Impl;
+       Impl * const d;
+};
+
+
 
 } // namespace lyx