undoManager.js

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define(["dojo/_base/declare","dojo/_base/lang","dojo/has","dojo/when","./kernel","./Evented","dojo/has!extend-esri?./OperationBase"],(function(i,t,o,n,s,h){var e=i([h],{declaredClass:"esri.UndoManager",maxOperations:10,canUndo:!1,canRedo:!1,position:0,length:0,onUndo:function(){},onRedo:function(){},onUndoComplete:function(){},onRedoComplete:function(){},onAdd:function(){},onChange:function(){},constructor:function(i){(i=i||{}).maxOperations&&(this.maxOperations=i.maxOperations),this._historyStack=[]},add:function(i){if(this.maxOperations>0)for(;this._historyStack.length>=this.maxOperations;)this._historyStack.shift();this._historyStack.splice(this.position,0,i),this.position++,this.clearRedo(),this.onAdd(),this._checkAvailability()},undo:function(){if(0===this.position)return null;var i=this.peekUndo();if(this.position--,i){var o=i.performUndo();this.onUndo(),this._checkAvailability(),n(o).then(t.hitch(this,this.onUndoComplete))}else this.onUndo(),this._checkAvailability()},redo:function(){if(this.position===this._historyStack.length)return null;var i=this.peekRedo();if(this.position++,i){var o=i.performRedo();this.onRedo(),this._checkAvailability(),n(o).then(t.hitch(this,this.onRedoComplete))}else this.onRedo(),this._checkAvailability()},_checkAvailability:function(){this.length=this._historyStack.length,0===this.length?(this.canRedo=!1,this.canUndo=!1):0===this.position?(this.canRedo=!0,this.canUndo=!1):this.position===this.length?(this.canUndo=!0,this.canRedo=!1):(this.canUndo=!0,this.canRedo=!0),this.onChange()},clearUndo:function(){this._historyStack.splice(0,this.position),this.position=0,this._checkAvailability()},clearRedo:function(){this._historyStack.splice(this.position,this._historyStack.length-this.position),this.position=this._historyStack.length,this._checkAvailability()},peekUndo:function(){if(this._historyStack.length>0&&this.position>0)return this.get(this.position-1)},peekRedo:function(){if(this._historyStack.length>0&&this.position<this._historyStack.length)return this.get(this.position)},get:function(i){return this._historyStack[i]},remove:function(i){this._historyStack.length>0&&(this._historyStack.splice(i,1),this.position>0&&i<this.position&&this.position--,this._checkAvailability())},destroy:function(){this._historyStack=null}});return o("extend-esri")&&(s.UndoManager=e),e}));