!function(a){function b(a){function b(){if(g>0){g--;var a=new Image;a.src=f[g].image,a.onload=function(){d(this)}}}function c(){if(g<f.length-1){g++;var a=new Image;a.src=f[g].image,a.onload=function(){d(this)}}}function d(b){a.handler(function(a,c){c.sketch.clear(),c.sketch.graphics.drawImage(b,0,0)})}function e(a){if(a.ctrlKey)switch(a.which){case 26:a.shiftKey?h.redo():h.undo();break;case 25:h.redo()}}var f=[],g=-1,h=this;this.undo=function(){return b(),a.handler(function(a,b){f[g]&&(b.strokes=f[g].strokes.slice())}),this},this.redo=function(){return c(),a.handler(function(a,b){f[g]&&(b.strokes=f[g].strokes.slice())}),this},this.reset=function(){return f=[],g=-1,this},this.save=function(){return g++,g<f.length&&(f.length=g),a.handler(function(a,b){f.push({image:a.toDataURL(),strokes:b.strokes.slice()})}),this},this.init=function(){return Event.remove(document,"keypress",e),Event.add(document,"keypress",e),this},this.destroy=function(){return Event.remove(document,"keypress",e),this.reset()}}var c="sketchable";Sketchable.prototype.plugins.memento=function(a){function d(b){if(!e.options.$$bound)if(e.options.$$bound=!0,e.options.events&&"function"==typeof e.options.events[b]){var c=e.options.events[b];e.options.events[b]=function(){c.apply(a,arguments),f[b].apply(a,arguments)}}else e.options.events[b]=f[b]}for(var e=a.config(),f={clear:function(a,b){b.memento.reset()},mouseup:function(a,b,c){b.memento.save()},destroy:function(a,b){b.memento.destroy()}},g="mouseup clear destroy".split(" "),h=0;h<g.length;h++)d(g[h]);deepExtend(a,{undo:function(){var a=this.elem,b=dataBind(a)[c];b.memento.undo()},redo:function(){var a=this.elem,b=dataBind(a)[c];b.memento.redo()},save:function(){var a=this.elem,b=dataBind(a)[c];b.memento.save()}}),e.memento=new b(a),e.memento.init().save()}}(this);