net/systemeD/halcyon/connection/CompositeUndoableAction.as

   1 package net.systemeD.halcyon.connection {
   2
   3     public class CompositeUndoableAction extends UndoableAction {
   4
   5         private var name:String;
   6         private var actions:Array = [];
   7         private var actionsDone:Boolean = false;
   8
   9         public function CompositeUndoableAction(name:String) {
  10             this.name = name;
  11         }
  12
  13         public function push(action:UndoableAction):void {
  14             actions.push(action);
  15         }
  16
  17         public function clearActions():void {
  18             actions = [];
  19         }
  20
  21         public override function doAction():uint {
  22             if ( actionsDone )
  23                 return UndoableAction.FAIL;
  24
  25             var somethingDone:Boolean = false;
  26             for ( var i:int = 0; i < actions.length; i++ ) {
  27                 var action:UndoableAction = actions[i];
  28
  29                 var result:uint = action.doAction();
  30                 if ( result == UndoableAction.NO_CHANGE ) {
  31                     // splice this one out as it doesn't do anything
  32                     actions.splice(i, 1)
  33                     i --;
  34                 } else if ( result == UndoableAction.FAIL ) {
  35                     undoFrom(i);
  36                     return UndoableAction.FAIL;
  37                 } else {
  38                     somethingDone = true;
  39                 }
  40             }
  41             actionsDone = true;
  42             return somethingDone ? UndoableAction.SUCCESS : UndoableAction.NO_CHANGE;
  43         }
  44
  45         public override function undoAction():uint {
  46             if ( !actionsDone )
  47                 return UndoableAction.FAIL;
  48
  49             undoFrom(actions.length);
  50             return UndoableAction.SUCCESS;
  51         }
  52
  53         public function undoFrom(index:int):void {
  54             for ( var i:int = index - 1; i >= 0; i-- ) {
  55                 var action:UndoableAction = actions[i];
  56                 trace("going to do "+action);
  57
  58                 action.undoAction();
  59             }
  60             actionsDone = false;
  61         }
  62
  63         public function toString():String {
  64             var str:String = " {" + actions.join(",") + "}";
  65             return name + str;
  66         }
  67     }
  68
  69 }
  70