-/// A limited Stack for the undo informations. Matthias 290496
-class UndoStack{
-private:
- ///
- struct StackAtom{
- ///
- StackAtom* previous;
- ///
- Undo* undo;
- };
- ///
- StackAtom* current;
- ///
- StackAtom *tmp;
- ///
- int size;
- ///
- int limit;
-public:
- ///
- UndoStack(){
- current = 0;
- // size must be initialised (thornley)
- size = 0;
- limit = 100; // the maximum number of undo steps stored. 0 means NO LIMIT.
- // Limit can be changed with UndoStack::SetStackLimit(int)
- }
- ///
- Undo *Pop(){
- Undo* result = 0;
- if (current){
- result = current->undo;
- tmp = current;
- current = current->previous;
- delete tmp;
- size--;
- }
- else {
- size = 0; // for safety...
- }
- return result;
- }
- ///
- Undo* Top(){
- if (current)
- return current->undo;
- else
- return 0;
- }
- ///
- ~UndoStack(){
- Clear();
- }
- ///
- void Clear(){
- Undo* tmp_undo = Pop();
- while (tmp_undo){
- delete tmp_undo;
- tmp_undo = Pop();
- }
- }
- ///
- void SetStackLimit(int limit_arg) {
- limit = limit_arg;
- }
-
- ///
- void Push(Undo* undo_arg){
- int i;
- StackAtom* tmp2;
- if (undo_arg){
- tmp = new StackAtom;
- tmp->undo = undo_arg;
- tmp->previous = current;
- current = tmp;
- size++;
- if (limit && size > limit){
- for (i=0; i<limit && tmp; i++)
- tmp = tmp->previous;
- while(tmp && tmp->previous){
- tmp2 = tmp->previous->previous;
- delete tmp->previous;
- size--;
- tmp->previous = tmp2;
- }
- }
- }
- }
-};
+/// this will undo the last action - returns false if no undo possible
+bool textUndo(BufferView & bv);
+
+/// this will redo the last undo - returns false if no redo possible
+bool textRedo(BufferView & bv);
+
+/// makes sure the next operation will be stored
+void finishUndo();
+
+
+/**
+ * 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.
+ *
+ * FIXME: We need something to record undo in partial grids for mathed.
+ * Right now we use recordUndoInset if more than one cell is changed,
+ * but that puts the cursor in front of the inset after undo. We would need
+ * something like
+ * recordUndoGrid(LCursor & cur, Undo::undo_kind kind, idx_type from, idx_type to);
+ * and store the cell information in class Undo.
+ */
+
+/// The general case: prepare undo for an arbitrary range.
+/// FIXME: replace LCursor with DocIterator. This is not possible right
+/// now because we need access to Buffer->params()!.
+void recordUndo(LCursor & cur, Undo::undo_kind kind,
+ pit_type from, pit_type to);
+
+/// Convenience: prepare undo for the range between 'from' and cursor.
+void recordUndo(LCursor & cur, Undo::undo_kind kind, pit_type from);
+
+/// Convenience: prepare undo for the single paragraph or cell
+/// containing the cursor
+void recordUndo(LCursor & cur, Undo::undo_kind kind = Undo::ATOMIC);
+/// Convenience: prepare undo for the inset containing the cursor
+void recordUndoInset(LCursor & cur, Undo::undo_kind kind = Undo::ATOMIC);
+/// Convenience: prepare undo for the selected paragraphs
+void recordUndoSelection(LCursor & cur, Undo::undo_kind kind = Undo::ATOMIC);
+
+/// Convenience: prepare undo for the whole buffer
+void recordUndoFullDocument(BufferView * bv);
+
+
+} // namespace lyx