Changes between Version 4 and Version 5 of PRO_CHANGE_MANAGER_R0

Timestamp:

01/07/09 21:15:40 (16 years ago)

Author:

peko

Comment:

--

PRO_CHANGE_MANAGER_R0

@@ -34 +34 @@
 {{{
    skip:
-   1. a = 5 | 5
-   2. a = 6 | 6
-   3. a = 7 | 7
+   1. a = 5  | 5
+   2. a = 6  | 6
+   3. a = 7  | 7
    4. skip 2 | 7 because a new change has occurred after 2.
 
    skip/undo:
-   1. b = 10 | 10
-   2. b = 5 | 5
-   3. skip 2 | 10 is the last change that is to be undone.
-   4. undo | 5 because the skip is undone.
-   5. skip 4 | 10 because the last undo is skipped as a change.
+   1. b = 10   | 10
+   2. b = 5    | 5
+   3. skip 2   | 10 is the last change that is to be undone.
+   4. undo     | 5 because the skip is undone.
+   5. skip 4   | 10 because the last undo is skipped as a change.
   
    more complicated:
-   1. c = 5 | 5
-   2. c = 7 | 7
-   3. c = 10 | 10
-   4. c = 12 | 12
-   5. undo | 10 this is the current value of c
-   6. skip 3 | 7 
-   
+   1.  c = 5    | 5
+   2.  c = 7    | 7
+   3.  c = 10   | 10
+   4.  c = 12   | 12
+   5.  undo     | 10 this is the current value of c after the undo
+   6.  skip 3   | 7 since 10 was last value after the undo which is the third change.
+   7.  undo     | 10 again
+   8.  skip 7   | 7 after skipping change 7 we should return to value 7.
+   9.  redo     | 7 because this should not be possible since the corresponding undo is already missing so nothing changes.
+   10. unskip 7 | 10 since the value after the undo should had been 7.
+   11. skip 10  | 7 the previous value is returned.
+   12. skip 11  | 10 the previous is unskip 10 so the value remains exactly 10.
+   13. skip 12  | 7 again
+   14. unskip 11| 10
+   15. skip 1   | 10
+   15. skip 2   | 10
+   15. skip 3   | 10
+   15. skip 4   | 10 at this point we cannot revert the initializing of c.  Now what ?!?
+
 }}}
+
+'''Notes:'''
+ * skipping the previous change acts like a undo.
+ * unskipping the previous change acts like a redo.
+ * 
+
 == Related ==