fix mathed crash

[lyx.git] / src / undo.h

diff --git a/src/undo.h b/src/undo.h
index 415377cf3309cd05496354c98bad323ddc688b12..e5060add608eb7c532a5724ef65447eddcc9a0e6 100644 (file)
--- a/src/undo.h
+++ b/src/undo.h
@@ -6,7 +6,9 @@
  *
  * \author Asger Alstrup
  * \author Lars Gullik Bjønnes
+ * \author John Levon
  * \author André Pönitz
+ * \author Jürgen Vigna
  *
  * Full author contact details are available in file CREDITS.
  */
@@ -15,69 +17,96 @@
 #define UNDO_H
 
 #include "ParagraphList_fwd.h"
+#include "support/types.h"
+
+class LCursor;
+class BufferView;
+
 
 /**
  * These are the elements put on the undo stack. Each object
  * contains complete paragraphs and sufficient information
- * to restore the state. The work is done in undo_funcs.C
+ * to restore the state.
  */
 class Undo {
 public:
-       /**
-        * The undo kinds are used to combine consecutive undo recordings
-        * of the same kind.
-        */
+       /// This is used to combine consecutive undo recordings of the same kind.
        enum undo_kind {
                /**
                 * Insert something - these will combine to one big chunk
                 * when many inserts come after each other.
                 */
                INSERT,
-
                /**
                 * Delete something - these will combine to one big chunk
                 * when many deletes come after each other.
                 */
                DELETE,
-
                /// Atomic - each of these will have its own entry in the stack
                ATOMIC
        };
-       ///
-       Undo(undo_kind kind, int inset_id,
-            int first, int last,
-            int cursor, int cursor_pos,
-            ParagraphList const & par_arg);
 
-       /// Which kind of operation are we recording for?
+       /// constructor
+       Undo(undo_kind kind, int text, int index,
+               int first_par, int end_par, int cursor_par, int cursor_pos);
+
+public:
+       /// which kind of operation are we recording for?
        undo_kind kind;
+       /// hosting LyXText counted from buffer begin
+       int text;
+       /// cell in a tabular or similar
+       int index;
+       /// offset to the first paragraph in the paragraph list
+       int first_par;
+       /// offset to the last paragraph from the end of paragraph list
+       int end_par;
+       /// offset to the first paragraph in the paragraph list
+       int cursor_par;
+       /// the position of the cursor in the hosting paragraph
+       int cursor_pos;
+       /// the contents of the paragraphs saved
+       ParagraphList pars;
+};
 
-       /**
-        * ID of hosting inset if the cursor is in one.
-        * if -1, then the cursor is not in an inset.
-        * if >= 0, then the cursor is in inset with given id.
-        */
-       int inset_id;
 
-       /// Offset to the first paragraph in the main document paragraph list
-       int first_par_offset;
+/// this will undo the last action - returns false if no undo possible
+bool textUndo(BufferView &);
 
-       /// Offset to the last paragraph from the end of the main par. list
-       int last_par_offset;
+/// this will redo the last undo - returns false if no redo possible
+bool textRedo(BufferView &);
 
-       /**
-        * Offset from the start of the main document paragraph list,
-        * except if inside an inset, in which case it's the offset
-        * inside the hosting inset.
-        */
-       int cursor_par_offset;
+/// makes sure the next operation will be stored
+void finishUndo();
 
-       /// The position of the cursor in the hosting paragraph
-       int cursor_pos;
+/// whilst undo is frozen, all actions do not get added to the undo stack
+void freezeUndo();
 
-       /// The contents of the paragraphs saved
-       ParagraphList pars;
-};
+/// track undos again
+void unFreezeUndo();
+
+
+/**
+ * Record undo information - call with the current cursor and the 'other
+ * end' of the range of changed  paragraphs.  So we give an inclusive range.
+ * This is called before you make the changes to the paragraph, and it
+ * will record the original information of the paragraphs in the undo stack.
+ */
+
+/// the common case: prepare undo for an arbitrary range
+void recordUndo(LCursor & cur, Undo::undo_kind kind,
+       lyx::paroffset_type from, lyx::paroffset_type to);
+
+/// convienience: prepare undo for the range between 'from' and cursor.
+void recordUndo(LCursor & cur, Undo::undo_kind kind, lyx::paroffset_type from);
+
+/// convienience: prepare undo for the single paragraph containing the cursor
+void recordUndo(LCursor & cur, Undo::undo_kind kind);
+
+/// convienience: prepare undo for the single paragraph containing the cursor
+void recordUndoFullDocument(LCursor & cur);
 
+/// are we avoiding tracking undos currently?
+extern bool undo_frozen;
 
-#endif
+#endif // UNDO_FUNCS_H