!function(a){function b(b){function c(a,c){b.sketchable("handler",function(b,d){d.sketch.clear(),d.sketch.context.drawImage(a,0,0),d.strokes=c.strokes.slice(),d.sketch.callStack=c.callStack.slice()})}function d(a){if(a.ctrlKey)switch(a.which){case 26:a.shiftKey?g.redo():g.undo();break;case 25:g.redo()}}var e=[],f=-1,g=this;this.undo=function(){return f>0&&(f--,this.restore()),this},this.redo=function(){return f<e.length-1&&(f++,this.restore()),this},this.reset=function(){return e=[],f=-1,this.save()},this.save=function(a){return b.sketchable("handler",function(b,c){a&&a.identifier>0?e[f].strokes=c.strokes.slice():(e.push({image:b.get(0).toDataURL(),strokes:c.strokes.slice(),callStack:c.sketch.callStack.slice()}),f++)}),this},this.state=function(){return JSON.parse(JSON.stringify(e[f]))},this.restore=function(a){a||(a=e[f]);var b=new Image;return b.src=a.image,b.onload=function(){c(this,a)},this},this.init=function(){return a(document).off("keypress",d),a(document).on("keypress",d),this.save()},this.destroy=function(){return a(document).off("keypress",d),this.reset()}}var c="sketchable";a.fn.sketchable.plugins.memento=function(d){for(var e={clear:function(a,b){b.memento.reset()},mouseup:function(a,b,c){b.memento.save(c)},destroy:function(a,b){b.memento.destroy()}},f="mouseup clear destroy".split(" "),g=0;g<f.length;g++){var h=f[g];d.sketchable("decorate",h,e[h],"memento")}a.extend(a.fn.sketchable.api,{memento:{undo:function(){var b=a(this).data(c);return b.memento.undo(),d},redo:function(){var b=a(this).data(c);return b.memento.redo(),d},save:function(){var b=a(this).data(c);return b.memento.save(),d},state:function(){var b=a(this).data(c);return b.memento.state()},restore:function(b){var e=a(this).data(c);return e.memento.restore(b),d}}});var i=d.sketchable("data");i.memento=new b(d),i.memento.init()}}(jQuery);