Mercurial > projects > doodle
annotate doodle/main/undo_manager.d @ 29:960b408d3ac5
Builds and runs ok with builder now.
Still heaps of cleaning up to do, especially code roughly
imported from dog.
| author | Graham St Jack <graham.stjack@internode.on.net> |
|---|---|
| date | Mon, 03 Aug 2009 23:19:55 +0930 |
| parents | 1754cb773d41 |
| children |
| rev | line source |
|---|---|
|
29
960b408d3ac5
Builds and runs ok with builder now.
Graham St Jack <graham.stjack@internode.on.net>
parents:
28
diff
changeset
|
1 module doodle.main.undo_manager; |
| 25 | 2 |
|
28
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
3 version(none) { |
|
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
4 |
| 25 | 5 class UndoManager : IUndoManager { |
| 6 this() { | |
| 7 } | |
| 8 | |
| 9 void addObserver(IUndoObserver observer) { | |
| 10 _observers.add(observer); | |
| 11 } | |
| 12 | |
| 13 void removeObserver(IUndoObserver observer) { | |
| 14 _observers.remove(observer); | |
| 15 } | |
| 16 | |
| 17 void reset() { | |
| 18 assert(!inTransaction()); | |
| 19 _past.clear(); | |
| 20 _future.clear(); | |
| 21 foreach(IUndoObserver obs; _observers) { | |
| 22 obs.canUndo(false, ""); | |
| 23 obs.canRedo(false, ""); | |
| 24 } | |
| 25 } | |
| 26 | |
| 27 void undo() { | |
| 28 assert(canUndo()); | |
| 29 Transaction t = _past.pop(); | |
| 30 t.undo(); | |
| 31 _future.push(t); | |
| 32 } | |
| 33 | |
| 34 void redo() { | |
| 35 assert(canRedo()); | |
| 36 Transaction t = _future.pop(); | |
| 37 t.redo(); | |
| 38 _past.push(t); | |
| 39 } | |
| 40 | |
| 41 bool canUndo() { | |
| 42 assert(!inTransaction()); | |
| 43 return !_past.empty(); | |
| 44 } | |
| 45 | |
| 46 bool canRedo() { | |
|
28
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
47 assert(!inTransaction()); |
|
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
48 return !_future.empty(); |
| 25 | 49 } |
| 50 | |
| 51 void beginTransaction(char[] description) { | |
| 52 assert(!inTransaction()); | |
| 53 _current_transaction = new Transaction(description); | |
| 54 } | |
| 55 | |
| 56 void cancelTransaction() { | |
| 57 assert(inTransaction()); | |
| 58 _current_transaction.cancel(); | |
| 59 _current_transaction = null; | |
| 60 } | |
| 61 | |
| 62 void endTransaction() { | |
| 63 assert(inTransaction()); | |
| 64 _current_transaction.finalise(); | |
| 65 | |
| 66 if (!_future.empty()) { | |
| 67 _future.clear(); | |
| 68 foreach(IUndoObserver obs; _observers) { | |
| 69 obs.canRedo(false, ""); | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 _past.push(_current_transaction); | |
| 74 | |
| 75 foreach(IUndoObserver obs; _observers) { | |
| 76 bs.canUndo(true, _current_transaction.name()); | |
| 77 } | |
| 78 | |
| 79 _current_transaction = null; | |
| 80 } | |
| 81 | |
| 82 // IUndoManager implementations: | |
| 83 | |
| 84 void addAction(Action action) { | |
| 85 assert(inTransaction()); | |
| 86 _current_transaction.add(action); | |
| 87 } | |
| 88 | |
| 89 private { | |
| 90 bool inTransaction() { | |
| 91 return _current_transaction !is null; | |
| 92 } | |
| 93 | |
| 94 class Transaction { | |
| 95 enum State { | |
| 96 Accumulating, | |
| 97 Finalised, | |
| 98 Canceled | |
| 99 } | |
| 100 | |
| 101 this(char[] description) { | |
| 102 _description = description; | |
| 103 _state = Accumulating; | |
| 104 } | |
| 105 | |
| 106 char[] description() { | |
| 107 return _description; | |
| 108 } | |
| 109 | |
| 110 void add(Action action) { | |
| 111 assert(_state == State.Accumulating); | |
| 112 _actions.addTail(action); | |
| 113 } | |
| 114 | |
| 115 void finalise() { | |
| 116 assert(_state == State.Accumulating); | |
| 117 assert(!_actions.empty()); | |
| 118 _finalised = true; | |
| 119 } | |
| 120 | |
| 121 void cancel() { | |
| 122 assert(_state == State.Accumulating); | |
|
28
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
123 foreach_reverse(UndoAction ua; _actions) { |
| 25 | 124 ua.undo(); |
| 125 } | |
| 126 } | |
| 127 | |
| 128 void redo() { | |
| 129 assert(_finalised); | |
| 130 foreach (UndoAction ua; _actions) { | |
| 131 ua.redo(); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 void undo() { | |
| 136 assert(_finalised); | |
|
28
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
137 foreach_reverse(UndoAction ua; _actions) { |
| 25 | 138 ua.undo(); |
| 139 } | |
| 140 } | |
| 141 | |
| 142 private { | |
| 143 char[] _description; | |
|
28
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
144 List!(Action) _actions; |
| 25 | 145 State _state; |
| 146 } | |
| 147 } | |
| 148 | |
| 149 Transaction _current_transaction; | |
| 150 Stack!(Transaction) _past; | |
| 151 Stack!(Transaction) _future; | |
| 152 Set!(IUndoObserver) _observers; | |
| 153 } | |
| 154 } | |
|
28
1754cb773d41
Part-way through getting to compile with configure/builder.
Graham St Jack <graham.stjack@internode.on.net>
parents:
25
diff
changeset
|
155 } |