addons/point_of_sale/static/src/js/models.js

   1 function openerp_pos_models(instance, module){ //module is instance.point_of_sale
   2     var QWeb = instance.web.qweb;
   3         var _t = instance.web._t;
   4
   5     var round_di = instance.web.round_decimals;
   6     var round_pr = instance.web.round_precision
   7
   8     // The PosModel contains the Point Of Sale's representation of the backend.
   9     // Since the PoS must work in standalone ( Without connection to the server )
  10     // it must contains a representation of the server's PoS backend.
  11     // (taxes, product list, configuration options, etc.)  this representation
  12     // is fetched and stored by the PosModel at the initialisation.
  13     // this is done asynchronously, a ready deferred alows the GUI to wait interactively
  14     // for the loading to be completed
  15     // There is a single instance of the PosModel for each Front-End instance, it is usually called
  16     // 'pos' and is available to all widgets extending PosWidget.
  17
  18     module.PosModel = Backbone.Model.extend({
  19         initialize: function(session, attributes) {
  20             Backbone.Model.prototype.initialize.call(this, attributes);
  21             var  self = this;
  22             this.session = session;
  23             this.flush_mutex = new $.Mutex();                   // used to make sure the orders are sent to the server once at time
  24             this.pos_widget = attributes.pos_widget;
  25
  26             this.proxy = new module.ProxyDevice(this);              // used to communicate to the hardware devices via a local proxy
  27             this.barcode_reader = new module.BarcodeReader({'pos': this, proxy:this.proxy, patterns: {}});  // used to read barcodes
  28             this.proxy_queue = new module.JobQueue();           // used to prevent parallels communications to the proxy
  29             this.db = new module.PosDB();                       // a local database used to search trough products and categories & store pending orders
  30             this.debug = jQuery.deparam(jQuery.param.querystring()).debug !== undefined;    //debug mode
  31
  32             // Business data; loaded from the server at launch
  33             this.accounting_precision = 2; //TODO
  34             this.company_logo = null;
  35             this.company_logo_base64 = '';
  36             this.currency = null;
  37             this.shop = null;
  38             this.company = null;
  39             this.user = null;
  40             this.users = [];
  41             this.partners = [];
  42             this.cashier = null;
  43             this.cashregisters = [];
  44             this.bankstatements = [];
  45             this.taxes = [];
  46             this.pos_session = null;
  47             this.config = null;
  48             this.units = [];
  49             this.units_by_id = {};
  50             this.pricelist = null;
  51             this.order_sequence = 1;
  52             window.posmodel = this;
  53
  54             // these dynamic attributes can be watched for change by other models or widgets
  55             this.set({
  56                 'synch':            { state:'connected', pending:0 },
  57                 'orders':           new module.OrderCollection(),
  58                 'selectedOrder':    null,
  59             });
  60
  61             this.bind('change:synch',function(pos,synch){
  62                 clearTimeout(self.synch_timeout);
  63                 self.synch_timeout = setTimeout(function(){
  64                     if(synch.state !== 'disconnected' && synch.pending > 0){
  65                         self.set('synch',{state:'disconnected', pending:synch.pending});
  66                     }
  67                 },3000);
  68             });
  69
  70             this.get('orders').bind('remove', function(order,_unused_,options){
  71                 self.on_removed_order(order,options.index,options.reason);
  72             });
  73
  74             // We fetch the backend data on the server asynchronously. this is done only when the pos user interface is launched,
  75             // Any change on this data made on the server is thus not reflected on the point of sale until it is relaunched.
  76             // when all the data has loaded, we compute some stuff, and declare the Pos ready to be used.
  77             this.ready = this.load_server_data()
  78                 .then(function(){
  79                     if(self.config.use_proxy){
  80                         return self.connect_to_proxy();
  81                     }
  82                 });
  83
  84         },
  85
  86         // releases ressources holds by the model at the end of life of the posmodel
  87         destroy: function(){
  88             // FIXME, should wait for flushing, return a deferred to indicate successfull destruction
  89             // this.flush();
  90             this.proxy.close();
  91             this.barcode_reader.disconnect();
  92             this.barcode_reader.disconnect_from_proxy();
  93         },
  94         connect_to_proxy: function(){
  95             var self = this;
  96             var  done = new $.Deferred();
  97             this.barcode_reader.disconnect_from_proxy();
  98             this.pos_widget.loading_message(_t('Connecting to the PosBox'),0);
  99             this.pos_widget.loading_skip(function(){
 100                     self.proxy.stop_searching();
 101                 });
 102             this.proxy.autoconnect({
 103                     force_ip: self.config.proxy_ip || undefined,
 104                     progress: function(prog){
 105                         self.pos_widget.loading_progress(prog);
 106                     },
 107                 }).then(function(){
 108                     if(self.config.iface_scan_via_proxy){
 109                         self.barcode_reader.connect_to_proxy();
 110                     }
 111                 }).always(function(){
 112                     done.resolve();
 113                 });
 114             return done;
 115         },
 116
 117         // helper function to load data from the server. Obsolete use the models loader below.
 118         fetch: function(model, fields, domain, ctx){
 119             this._load_progress = (this._load_progress || 0) + 0.05;
 120             this.pos_widget.loading_message(_t('Loading')+' '+model,this._load_progress);
 121             return new instance.web.Model(model).query(fields).filter(domain).context(ctx).all()
 122         },
 123
 124         // Server side model loaders. This is the list of the models that need to be loaded from
 125         // the server. The models are loaded one by one by this list's order. The 'loaded' callback
 126         // is used to store the data in the appropriate place once it has been loaded. This callback
 127         // can return a deferred that will pause the loading of the next module.
 128         // a shared temporary dictionary is available for loaders to communicate private variables
 129         // used during loading such as object ids, etc.
 130         models: [
 131         {
 132             model:  'res.users',
 133             fields: ['name','company_id'],
 134             domain: function(self){ return [['id','=',self.session.uid]]; },
 135             loaded: function(self,users){ self.user = users[0]; },
 136         },{
 137             model:  'res.company',
 138             fields: [ 'currency_id', 'email', 'website', 'company_registry', 'vat', 'name', 'phone', 'partner_id' , 'country_id'],
 139             domain: function(self){ return [['id','=',self.user.company_id[0]]]; },
 140             loaded: function(self,companies){ self.company = companies[0]; },
 141         },{
 142             model:  'product.uom',
 143             fields: [],
 144             domain: null,
 145             loaded: function(self,units){
 146                 self.units = units;
 147                 var units_by_id = {};
 148                 for(var i = 0, len = units.length; i < len; i++){
 149                     units_by_id[units[i].id] = units[i];
 150                     units[i].groupable = ( units[i].category_id[0] === 1 );
 151                     units[i].is_unit   = ( units[i].id === 1 );
 152                 }
 153                 self.units_by_id = units_by_id;
 154             }
 155         },{
 156             model:  'res.users',
 157             fields: ['name','ean13'],
 158             domain: null,
 159             loaded: function(self,users){ self.users = users; },
 160         },{
 161             model:  'res.partner',
 162             fields: ['name','street','city','state_id','country_id','vat','phone','zip','mobile','email','ean13','write_date'],
 163             domain: null,
 164             loaded: function(self,partners){
 165                 self.partners = partners;
 166                 self.db.add_partners(partners);
 167             },
 168         },{
 169             model:  'res.country',
 170             fields: ['name'],
 171             loaded: function(self,countries){
 172                 self.countries = countries;
 173                 self.company.country = null;
 174                 for (var i = 0; i < countries.length; i++) {
 175                     if (countries[i].id === self.company.country_id[0]){
 176                         self.company.country = countries[i];
 177                     }
 178                 }
 179             },
 180         },{
 181             model:  'account.tax',
 182             fields: ['name','amount', 'price_include', 'type'],
 183             domain: null,
 184             loaded: function(self,taxes){ self.taxes = taxes; },
 185         },{
 186             model:  'pos.session',
 187             fields: ['id', 'journal_ids','name','user_id','config_id','start_at','stop_at','sequence_number','login_number'],
 188             domain: function(self){ return [['state','=','opened'],['user_id','=',self.session.uid]]; },
 189             loaded: function(self,pos_sessions){
 190                 self.pos_session = pos_sessions[0];
 191
 192                 var orders = self.db.get_orders();
 193                 for (var i = 0; i < orders.length; i++) {
 194                     self.pos_session.sequence_number = Math.max(self.pos_session.sequence_number, orders[i].data.sequence_number+1);
 195                 }
 196             },
 197         },{
 198             model: 'pos.config',
 199             fields: [],
 200             domain: function(self){ return [['id','=', self.pos_session.config_id[0]]]; },
 201             loaded: function(self,configs){
 202                 self.config = configs[0];
 203                 self.config.use_proxy = self.config.iface_payment_terminal ||
 204                                         self.config.iface_electronic_scale ||
 205                                         self.config.iface_print_via_proxy  ||
 206                                         self.config.iface_scan_via_proxy   ||
 207                                         self.config.iface_cashdrawer;
 208
 209                 self.barcode_reader.add_barcode_patterns({
 210                     'product':  self.config.barcode_product,
 211                     'cashier':  self.config.barcode_cashier,
 212                     'client':   self.config.barcode_customer,
 213                     'weight':   self.config.barcode_weight,
 214                     'discount': self.config.barcode_discount,
 215                     'price':    self.config.barcode_price,
 216                 });
 217
 218                 if (self.config.company_id[0] !== self.user.company_id[0]) {
 219                     throw new Error(_t("Error: The Point of Sale User must belong to the same company as the Point of Sale. You are probably trying to load the point of sale as an administrator in a multi-company setup, with the administrator account set to the wrong company."));
 220                 }
 221             },
 222         },{
 223             model: 'stock.location',
 224             fields: [],
 225             domain: function(self){ return [['id','=', self.config.stock_location_id[0]]]; },
 226             loaded: function(self, locations){ self.shop = locations[0]; },
 227         },{
 228             model:  'product.pricelist',
 229             fields: ['currency_id'],
 230             domain: function(self){ return [['id','=',self.config.pricelist_id[0]]]; },
 231             loaded: function(self, pricelists){ self.pricelist = pricelists[0]; },
 232         },{
 233             model: 'res.currency',
 234             fields: ['symbol','position','rounding','accuracy'],
 235             domain: function(self){ return [['id','=',self.pricelist.currency_id[0]]]; },
 236             loaded: function(self, currencies){
 237                 self.currency = currencies[0];
 238             },
 239         },{
 240             model: 'product.packaging',
 241             fields: ['ean','product_tmpl_id'],
 242             domain: null,
 243             loaded: function(self, packagings){
 244                 self.db.add_packagings(packagings);
 245             },
 246         },{
 247             model:  'pos.category',
 248             fields: ['id','name','parent_id','child_id','image'],
 249             domain: null,
 250             loaded: function(self, categories){
 251                 self.db.add_categories(categories);
 252             },
 253         },{
 254             model:  'product.product',
 255             fields: ['display_name', 'list_price','price','pos_categ_id', 'taxes_id', 'ean13', 'default_code',
 256                      'to_weight', 'uom_id', 'uos_id', 'uos_coeff', 'mes_type', 'description_sale', 'description',
 257                      'product_tmpl_id'],
 258             domain:  function(self){ return [['sale_ok','=',true],['available_in_pos','=',true]]; },
 259             context: function(self){ return { pricelist: self.pricelist.id, display_default_code: false }; },
 260             loaded: function(self, products){
 261                 self.db.add_products(products);
 262             },
 263         },{
 264             model:  'account.bank.statement',
 265             fields: ['account_id','currency','journal_id','state','name','user_id','pos_session_id'],
 266             domain: function(self){ return [['state', '=', 'open'],['pos_session_id', '=', self.pos_session.id]]; },
 267             loaded: function(self, bankstatements, tmp){
 268                 self.bankstatements = bankstatements;
 269
 270                 tmp.journals = [];
 271                 _.each(bankstatements,function(statement){
 272                     tmp.journals.push(statement.journal_id[0]);
 273                 });
 274             },
 275         },{
 276             model:  'account.journal',
 277             fields: [],
 278             domain: function(self,tmp){ return [['id','in',tmp.journals]]; },
 279             loaded: function(self, journals){
 280                 self.journals = journals;
 281
 282                 // associate the bank statements with their journals.
 283                 var bankstatements = self.bankstatements;
 284                 for(var i = 0, ilen = bankstatements.length; i < ilen; i++){
 285                     for(var j = 0, jlen = journals.length; j < jlen; j++){
 286                         if(bankstatements[i].journal_id[0] === journals[j].id){
 287                             bankstatements[i].journal = journals[j];
 288                         }
 289                     }
 290                 }
 291                 self.cashregisters = bankstatements;
 292             },
 293         },{
 294             label: 'fonts',
 295             loaded: function(self){
 296                 var fonts_loaded = new $.Deferred();
 297                 // Waiting for fonts to be loaded to prevent receipt printing
 298                 // from printing empty receipt while loading Inconsolata
 299                 // ( The font used for the receipt )
 300                 waitForWebfonts(['Lato','Inconsolata'], function(){
 301                     fonts_loaded.resolve();
 302                 });
 303                 // The JS used to detect font loading is not 100% robust, so
 304                 // do not wait more than 5sec
 305                 setTimeout(function(){
 306                     fonts_loaded.resolve();
 307                 },5000);
 308
 309                 return fonts_loaded;
 310             },
 311         },{
 312             label: 'pictures',
 313             loaded: function(self){
 314                 self.company_logo = new Image();
 315                 var  logo_loaded = new $.Deferred();
 316                 self.company_logo.onload = function(){
 317                     var img = self.company_logo;
 318                     var ratio = 1;
 319                     var targetwidth = 300;
 320                     var maxheight = 150;
 321                     if( img.width !== targetwidth ){
 322                         ratio = targetwidth / img.width;
 323                     }
 324                     if( img.height * ratio > maxheight ){
 325                         ratio = maxheight / img.height;
 326                     }
 327                     var width  = Math.floor(img.width * ratio);
 328                     var height = Math.floor(img.height * ratio);
 329                     var c = document.createElement('canvas');
 330                         c.width  = width;
 331                         c.height = height
 332                     var ctx = c.getContext('2d');
 333                         ctx.drawImage(self.company_logo,0,0, width, height);
 334
 335                     self.company_logo_base64 = c.toDataURL();
 336                     logo_loaded.resolve();
 337                 };
 338                 self.company_logo.onerror = function(){
 339                     logo_loaded.reject();
 340                 };
 341                 self.company_logo.src = '/web/binary/company_logo' +'?_'+Math.random();
 342
 343                 return logo_loaded;
 344             },
 345         },
 346         ],
 347
 348         // loads all the needed data on the sever. returns a deferred indicating when all the data has loaded.
 349         load_server_data: function(){
 350             var self = this;
 351             var loaded = new $.Deferred();
 352             var progress = 0;
 353             var progress_step = 1.0 / self.models.length;
 354             var tmp = {}; // this is used to share a temporary state between models loaders
 355
 356             function load_model(index){
 357                 if(index >= self.models.length){
 358                     loaded.resolve();
 359                 }else{
 360                     var model = self.models[index];
 361                     self.pos_widget.loading_message(_t('Loading')+' '+(model.label || model.model || ''), progress);
 362                     var fields =  typeof model.fields === 'function'  ? model.fields(self,tmp)  : model.fields;
 363                     var domain =  typeof model.domain === 'function'  ? model.domain(self,tmp)  : model.domain;
 364                     var context = typeof model.context === 'function' ? model.context(self,tmp) : model.context;
 365                     progress += progress_step;
 366
 367                     if( model.model ){
 368                         new instance.web.Model(model.model).query(fields).filter(domain).context(context).all()
 369                             .then(function(result){
 370                                 try{    // catching exceptions in model.loaded(...)
 371                                     $.when(model.loaded(self,result,tmp))
 372                                         .then(function(){ load_model(index + 1); },
 373                                               function(err){ loaded.reject(err); });
 374                                 }catch(err){
 375                                     loaded.reject(err);
 376                                 }
 377                             },function(err){
 378                                 loaded.reject(err);
 379                             });
 380                     }else if( model.loaded ){
 381                         try{    // catching exceptions in model.loaded(...)
 382                             $.when(model.loaded(self,tmp))
 383                                 .then(  function(){ load_model(index +1); },
 384                                         function(err){ loaded.reject(err); });
 385                         }catch(err){
 386                             loaded.reject(err);
 387                         }
 388                     }else{
 389                         load_model(index + 1);
 390                     }
 391                 }
 392             }
 393
 394             try{
 395                 load_model(0);
 396             }catch(err){
 397                 loaded.reject(err);
 398             }
 399
 400             return loaded;
 401         },
 402
 403         // reload the list of partner, returns as a deferred that resolves if there were
 404         // updated partners, and fails if not
 405         load_new_partners: function(){
 406             var self = this;
 407             var def  = new $.Deferred();
 408             var fields = _.find(this.models,function(model){ return model.model === 'res.partner'; }).fields;
 409             new instance.web.Model('res.partner')
 410                 .query(fields)
 411                 .filter([['write_date','>',this.db.get_partner_write_date()]])
 412                 .all({'timeout':3000, 'shadow': true})
 413                 .then(function(partners){
 414                     if (self.db.add_partners(partners)) {   // check if the partners we got were real updates
 415                         def.resolve();
 416                     } else {
 417                         def.reject();
 418                     }
 419                 }, function(){ def.reject(); });
 420             return def;
 421         },
 422
 423         // this is called when an order is removed from the order collection. It ensures that there is always an existing
 424         // order and a valid selected order
 425         on_removed_order: function(removed_order,index,reason){
 426             if( (reason === 'abandon' || removed_order.temporary) && this.get('orders').size() > 0){
 427                 // when we intentionally remove an unfinished order, and there is another existing one
 428                 this.set({'selectedOrder' : this.get('orders').at(index) || this.get('orders').last()});
 429             }else{
 430                 // when the order was automatically removed after completion,
 431                 // or when we intentionally delete the only concurrent order
 432                 this.add_new_order();
 433             }
 434         },
 435
 436         //creates a new empty order and sets it as the current order
 437         add_new_order: function(){
 438             var order = new module.Order({pos:this});
 439             this.get('orders').add(order);
 440             this.set('selectedOrder', order);
 441         },
 442
 443         get_order: function(){
 444             return this.get('selectedOrder');
 445         },
 446
 447         //removes the current order
 448         delete_current_order: function(){
 449             this.get('selectedOrder').destroy({'reason':'abandon'});
 450         },
 451
 452         // saves the order locally and try to send it to the backend.
 453         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 454         push_order: function(order) {
 455             var self = this;
 456
 457             if(order){
 458                 this.proxy.log('push_order',order.export_as_JSON());
 459                 this.db.add_order(order.export_as_JSON());
 460             }
 461
 462             var pushed = new $.Deferred();
 463
 464             this.flush_mutex.exec(function(){
 465                 var flushed = self._flush_orders(self.db.get_orders());
 466
 467                 flushed.always(function(ids){
 468                     pushed.resolve();
 469                 });
 470             });
 471             return pushed;
 472         },
 473
 474         // saves the order locally and try to send it to the backend and make an invoice
 475         // returns a deferred that succeeds when the order has been posted and successfully generated
 476         // an invoice. This method can fail in various ways:
 477         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 478         //     this error is solved
 479         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 480         //     the network connection is up
 481
 482         push_and_invoice_order: function(order){
 483             var self = this;
 484             var invoiced = new $.Deferred();
 485
 486             if(!order.get_client()){
 487                 invoiced.reject('error-no-client');
 488                 return invoiced;
 489             }
 490
 491             var order_id = this.db.add_order(order.export_as_JSON());
 492
 493             this.flush_mutex.exec(function(){
 494                 var done = new $.Deferred(); // holds the mutex
 495
 496                 // send the order to the server
 497                 // we have a 30 seconds timeout on this push.
 498                 // FIXME: if the server takes more than 30 seconds to accept the order,
 499                 // the client will believe it wasn't successfully sent, and very bad
 500                 // things will happen as a duplicate will be sent next time
 501                 // so we must make sure the server detects and ignores duplicated orders
 502
 503                 var transfer = self._flush_orders([self.db.get_order(order_id)], {timeout:30000, to_invoice:true});
 504
 505                 transfer.fail(function(){
 506                     invoiced.reject('error-transfer');
 507                     done.reject();
 508                 });
 509
 510                 // on success, get the order id generated by the server
 511                 transfer.pipe(function(order_server_id){
 512
 513                     // generate the pdf and download it
 514                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 515                         active_ids:order_server_id,
 516                     }});
 517
 518                     invoiced.resolve();
 519                     done.resolve();
 520                 });
 521
 522                 return done;
 523
 524             });
 525
 526             return invoiced;
 527         },
 528
 529         // wrapper around the _save_to_server that updates the synch status widget
 530         _flush_orders: function(orders, options) {
 531             var self = this;
 532             this.set('synch',{ state: 'connecting', pending: orders.length});
 533
 534             return self._save_to_server(orders, options).done(function (server_ids) {
 535                 var pending = self.db.get_orders().length;
 536
 537                 self.set('synch', {
 538                     state: pending ? 'connecting' : 'connected',
 539                     pending: pending
 540                 });
 541
 542                 return server_ids;
 543             });
 544         },
 545
 546         // send an array of orders to the server
 547         // available options:
 548         // - timeout: timeout for the rpc call in ms
 549         // returns a deferred that resolves with the list of
 550         // server generated ids for the sent orders
 551         _save_to_server: function (orders, options) {
 552             if (!orders || !orders.length) {
 553                 var result = $.Deferred();
 554                 result.resolve([]);
 555                 return result;
 556             }
 557
 558             options = options || {};
 559
 560             var self = this;
 561             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 562
 563             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 564             // then we want to notify the user that we are waiting on something )
 565             var posOrderModel = new instance.web.Model('pos.order');
 566             return posOrderModel.call('create_from_ui',
 567                 [_.map(orders, function (order) {
 568                     order.to_invoice = options.to_invoice || false;
 569                     return order;
 570                 })],
 571                 undefined,
 572                 {
 573                     shadow: !options.to_invoice,
 574                     timeout: timeout
 575                 }
 576             ).then(function (server_ids) {
 577                 _.each(orders, function (order) {
 578                     self.db.remove_order(order.id);
 579                 });
 580                 return server_ids;
 581             }).fail(function (error, event){
 582                 if(error.code === 200 ){    // Business Logic Error, not a connection problem
 583                     //if warning do not need to dispaly traceback!!
 584                     if(error.data.exception_type == 'warning'){
 585                         delete error.data.debug;
 586                     }
 587                     self.pos_widget.screen_selector.show_popup('error-traceback',{
 588                         message: error.data.message,
 589                         comment: error.data.debug
 590                     });
 591                 }
 592                 // prevent an error popup creation by the rpc failure
 593                 // we want the failure to be silent as we send the orders in the background
 594                 event.preventDefault();
 595                 console.error('Failed to send orders:', orders);
 596             });
 597         },
 598
 599         scan_product: function(parsed_code){
 600             var self = this;
 601             var selectedOrder = this.get('selectedOrder');
 602             if(parsed_code.encoding === 'ean13'){
 603                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 604             }else if(parsed_code.encoding === 'reference'){
 605                 var product = this.db.get_product_by_reference(parsed_code.code);
 606             }
 607
 608             if(!product){
 609                 return false;
 610             }
 611
 612             if(parsed_code.type === 'price'){
 613                 selectedOrder.addProduct(product, {price:parsed_code.value});
 614             }else if(parsed_code.type === 'weight'){
 615                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 616             }else if(parsed_code.type === 'discount'){
 617                 selectedOrder.addProduct(product, {discount:parsed_code.value, merge:false});
 618             }else{
 619                 selectedOrder.addProduct(product);
 620             }
 621             return true;
 622         },
 623     });
 624
 625     var orderline_id = 1;
 626
 627     // An orderline represent one element of the content of a client's shopping cart.
 628     // An orderline contains a product, its quantity, its price, discount. etc.
 629     // An Order contains zero or more Orderlines.
 630     module.Orderline = Backbone.Model.extend({
 631         initialize: function(attr,options){
 632             this.pos = options.pos;
 633             this.order = options.order;
 634             this.product = options.product;
 635             this.price   = options.product.price;
 636             this.quantity = 1;
 637             this.quantityStr = '1';
 638             this.discount = 0;
 639             this.discountStr = '0';
 640             this.type = 'unit';
 641             this.selected = false;
 642             this.id       = orderline_id++;
 643         },
 644         clone: function(){
 645             var orderline = new module.Orderline({},{
 646                 pos: this.pos,
 647                 order: null,
 648                 product: this.product,
 649                 price: this.price,
 650             });
 651             orderline.quantity = this.quantity;
 652             orderline.quantityStr = this.quantityStr;
 653             orderline.discount = this.discount;
 654             orderline.type = this.type;
 655             orderline.selected = false;
 656             return orderline;
 657         },
 658         // sets a discount [0,100]%
 659         set_discount: function(discount){
 660             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 661             this.discount = disc;
 662             this.discountStr = '' + disc;
 663             this.trigger('change',this);
 664         },
 665         // returns the discount [0,100]%
 666         get_discount: function(){
 667             return this.discount;
 668         },
 669         get_discount_str: function(){
 670             return this.discountStr;
 671         },
 672         get_product_type: function(){
 673             return this.type;
 674         },
 675         // sets the quantity of the product. The quantity will be rounded according to the
 676         // product's unity of measure properties. Quantities greater than zero will not get
 677         // rounded to zero
 678         set_quantity: function(quantity){
 679             if(quantity === 'remove'){
 680                 this.order.removeOrderline(this);
 681                 return;
 682             }else{
 683                 var quant = parseFloat(quantity) || 0;
 684                 var unit = this.get_unit();
 685                 if(unit){
 686                     this.quantity    = round_pr(quant, unit.rounding);
 687                     this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 688                 }else{
 689                     this.quantity    = quant;
 690                     this.quantityStr = '' + this.quantity;
 691                 }
 692             }
 693             this.trigger('change',this);
 694         },
 695         // return the quantity of product
 696         get_quantity: function(){
 697             return this.quantity;
 698         },
 699         get_quantity_str: function(){
 700             return this.quantityStr;
 701         },
 702         get_quantity_str_with_unit: function(){
 703             var unit = this.get_unit();
 704             if(unit && !unit.is_unit){
 705                 return this.quantityStr + ' ' + unit.name;
 706             }else{
 707                 return this.quantityStr;
 708             }
 709         },
 710         // return the unit of measure of the product
 711         get_unit: function(){
 712             var unit_id = (this.product.uos_id || this.product.uom_id);
 713             if(!unit_id){
 714                 return undefined;
 715             }
 716             unit_id = unit_id[0];
 717             if(!this.pos){
 718                 return undefined;
 719             }
 720             return this.pos.units_by_id[unit_id];
 721         },
 722         // return the product of this orderline
 723         get_product: function(){
 724             return this.product;
 725         },
 726         // selects or deselects this orderline
 727         set_selected: function(selected){
 728             this.selected = selected;
 729             this.trigger('change',this);
 730         },
 731         // returns true if this orderline is selected
 732         is_selected: function(){
 733             return this.selected;
 734         },
 735         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 736         // in the orderline. This returns true if it makes sense to merge the two
 737         can_be_merged_with: function(orderline){
 738             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 739                 return false;
 740             }else if(!this.get_unit() || !this.get_unit().groupable){
 741                 return false;
 742             }else if(this.get_product_type() !== orderline.get_product_type()){
 743                 return false;
 744             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 745                 return false;
 746             }else if(this.price !== orderline.price){
 747                 return false;
 748             }else{
 749                 return true;
 750             }
 751         },
 752         merge: function(orderline){
 753             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 754         },
 755         export_as_JSON: function() {
 756             return {
 757                 qty: this.get_quantity(),
 758                 price_unit: this.get_unit_price(),
 759                 discount: this.get_discount(),
 760                 product_id: this.get_product().id,
 761             };
 762         },
 763         //used to create a json of the ticket, to be sent to the printer
 764         export_for_printing: function(){
 765             return {
 766                 quantity:           this.get_quantity(),
 767                 unit_name:          this.get_unit().name,
 768                 price:              this.get_unit_price(),
 769                 discount:           this.get_discount(),
 770                 product_name:       this.get_product().display_name,
 771                 price_display :     this.get_display_price(),
 772                 price_with_tax :    this.get_price_with_tax(),
 773                 price_without_tax:  this.get_price_without_tax(),
 774                 tax:                this.get_tax(),
 775                 product_description:      this.get_product().description,
 776                 product_description_sale: this.get_product().description_sale,
 777             };
 778         },
 779         // changes the base price of the product for this orderline
 780         set_unit_price: function(price){
 781             this.price = round_di(parseFloat(price) || 0, 2);
 782             this.trigger('change',this);
 783         },
 784         get_unit_price: function(){
 785             var rounding = this.pos.currency.rounding;
 786             return round_pr(this.price,rounding);
 787         },
 788         get_display_price: function(){
 789             var rounding = this.pos.currency.rounding;
 790             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 791         },
 792         get_price_without_tax: function(){
 793             return this.get_all_prices().priceWithoutTax;
 794         },
 795         get_price_with_tax: function(){
 796             return this.get_all_prices().priceWithTax;
 797         },
 798         get_tax: function(){
 799             return this.get_all_prices().tax;
 800         },
 801         get_tax_details: function(){
 802             return this.get_all_prices().taxDetails;
 803         },
 804         get_all_prices: function(){
 805             var self = this;
 806             var currency_rounding = this.pos.currency.rounding;
 807             var base = round_pr(this.get_quantity() * this.get_unit_price() * (1.0 - (this.get_discount() / 100.0)), currency_rounding);
 808             var totalTax = base;
 809             var totalNoTax = base;
 810
 811             var product =  this.get_product();
 812             var taxes_ids = product.taxes_id;
 813             var taxes =  self.pos.taxes;
 814             var taxtotal = 0;
 815             var taxdetail = {};
 816             _.each(taxes_ids, function(el) {
 817                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 818                 if (tax.price_include) {
 819                     var tmp;
 820                     if (tax.type === "percent") {
 821                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 822                     } else if (tax.type === "fixed") {
 823                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 824                     } else {
 825                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 826                     }
 827                     tmp = round_pr(tmp,currency_rounding);
 828                     taxtotal += tmp;
 829                     totalNoTax -= tmp;
 830                     taxdetail[tax.id] = tmp;
 831                 } else {
 832                     var tmp;
 833                     if (tax.type === "percent") {
 834                         tmp = tax.amount * base;
 835                     } else if (tax.type === "fixed") {
 836                         tmp = tax.amount * self.get_quantity();
 837                     } else {
 838                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 839                     }
 840                     tmp = round_pr(tmp,currency_rounding);
 841                     taxtotal += tmp;
 842                     totalTax += tmp;
 843                     taxdetail[tax.id] = tmp;
 844                 }
 845             });
 846             return {
 847                 "priceWithTax": totalTax,
 848                 "priceWithoutTax": totalNoTax,
 849                 "tax": taxtotal,
 850                 "taxDetails": taxdetail,
 851             };
 852         },
 853     });
 854
 855     module.OrderlineCollection = Backbone.Collection.extend({
 856         model: module.Orderline,
 857     });
 858
 859     // Every Paymentline contains a cashregister and an amount of money.
 860     module.Paymentline = Backbone.Model.extend({
 861         initialize: function(attributes, options) {
 862             this.amount = 0;
 863             this.cashregister = options.cashregister;
 864             this.name = this.cashregister.journal_id[1];
 865             this.selected = false;
 866         },
 867         //sets the amount of money on this payment line
 868         set_amount: function(value){
 869             this.amount = round_di(parseFloat(value) || 0, 2);
 870             this.trigger('change:amount',this);
 871         },
 872         // returns the amount of money on this paymentline
 873         get_amount: function(){
 874             return this.amount;
 875         },
 876         set_selected: function(selected){
 877             if(this.selected !== selected){
 878                 this.selected = selected;
 879                 this.trigger('change:selected',this);
 880             }
 881         },
 882         // returns the associated cashregister
 883         //exports as JSON for server communication
 884         export_as_JSON: function(){
 885             return {
 886                 name: instance.web.datetime_to_str(new Date()),
 887                 statement_id: this.cashregister.id,
 888                 account_id: this.cashregister.account_id[0],
 889                 journal_id: this.cashregister.journal_id[0],
 890                 amount: this.get_amount()
 891             };
 892         },
 893         //exports as JSON for receipt printing
 894         export_for_printing: function(){
 895             return {
 896                 amount: this.get_amount(),
 897                 journal: this.cashregister.journal_id[1],
 898             };
 899         },
 900     });
 901
 902     module.PaymentlineCollection = Backbone.Collection.extend({
 903         model: module.Paymentline,
 904     });
 905
 906
 907     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 908     // plus the associated payment information (the Paymentlines)
 909     // there is always an active ('selected') order in the Pos, a new one is created
 910     // automaticaly once an order is completed and sent to the server.
 911     module.Order = Backbone.Model.extend({
 912         initialize: function(attributes){
 913             Backbone.Model.prototype.initialize.apply(this, arguments);
 914             this.pos = attributes.pos;
 915             this.sequence_number = this.pos.pos_session.sequence_number++;
 916             this.uid =     this.generateUniqueId();
 917             this.set({
 918                 creationDate:   new Date(),
 919                 orderLines:     new module.OrderlineCollection(),
 920                 paymentLines:   new module.PaymentlineCollection(),
 921                 name:           _t("Order ") + this.uid,
 922                 client:         null,
 923             });
 924             this.selected_orderline   = undefined;
 925             this.selected_paymentline = undefined;
 926             this.screen_data = {};  // see ScreenSelector
 927             this.receipt_type = 'receipt';  // 'receipt' || 'invoice'
 928             this.temporary = attributes.temporary || false;
 929             this.to_invoice = false;
 930             return this;
 931         },
 932         is_empty: function(){
 933             return (this.get('orderLines').models.length === 0);
 934         },
 935         // Generates a public identification number for the order.
 936         // The generated number must be unique and sequential. They are made 12 digit long
 937         // to fit into EAN-13 barcodes, should it be needed
 938         generateUniqueId: function() {
 939             function zero_pad(num,size){
 940                 var s = ""+num;
 941                 while (s.length < size) {
 942                     s = "0" + s;
 943                 }
 944                 return s;
 945             }
 946             return zero_pad(this.pos.pos_session.id,5) +'-'+
 947                    zero_pad(this.pos.pos_session.login_number,3) +'-'+
 948                    zero_pad(this.sequence_number,4);
 949         },
 950         addOrderline: function(line){
 951             if(line.order){
 952                 order.removeOrderline(line);
 953             }
 954             line.order = this;
 955             this.get('orderLines').add(line);
 956             this.selectLine(this.getLastOrderline());
 957         },
 958         addProduct: function(product, options){
 959             options = options || {};
 960             var attr = JSON.parse(JSON.stringify(product));
 961             attr.pos = this.pos;
 962             attr.order = this;
 963             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
 964
 965             if(options.quantity !== undefined){
 966                 line.set_quantity(options.quantity);
 967             }
 968             if(options.price !== undefined){
 969                 line.set_unit_price(options.price);
 970             }
 971             if(options.discount !== undefined){
 972                 line.set_discount(options.discount);
 973             }
 974
 975             var last_orderline = this.getLastOrderline();
 976             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
 977                 last_orderline.merge(line);
 978             }else{
 979                 this.get('orderLines').add(line);
 980             }
 981             this.selectLine(this.getLastOrderline());
 982         },
 983         removeOrderline: function( line ){
 984             this.get('orderLines').remove(line);
 985             this.selectLine(this.getLastOrderline());
 986         },
 987         getOrderline: function(id){
 988             var orderlines = this.get('orderLines').models;
 989             for(var i = 0; i < orderlines.length; i++){
 990                 if(orderlines[i].id === id){
 991                     return orderlines[i];
 992                 }
 993             }
 994             return null;
 995         },
 996         getLastOrderline: function(){
 997             return this.get('orderLines').at(this.get('orderLines').length -1);
 998         },
 999         addPaymentline: function(cashregister) {
1000             var paymentLines = this.get('paymentLines');
1001             var newPaymentline = new module.Paymentline({},{cashregister:cashregister});
1002             if(cashregister.journal.type !== 'cash'){
1003                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
1004             }
1005             paymentLines.add(newPaymentline);
1006             this.selectPaymentline(newPaymentline);
1007
1008         },
1009         removePaymentline: function(line){
1010             if(this.selected_paymentline === line){
1011                 this.selectPaymentline(undefined);
1012             }
1013             this.get('paymentLines').remove(line);
1014         },
1015         getName: function() {
1016             return this.get('name');
1017         },
1018         getSubtotal : function(){
1019             return (this.get('orderLines')).reduce((function(sum, orderLine){
1020                 return sum + orderLine.get_display_price();
1021             }), 0);
1022         },
1023         getTotalTaxIncluded: function() {
1024             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1025                 return sum + orderLine.get_price_with_tax();
1026             }), 0);
1027         },
1028         getDiscountTotal: function() {
1029             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1030                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
1031             }), 0);
1032         },
1033         getTotalTaxExcluded: function() {
1034             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1035                 return sum + orderLine.get_price_without_tax();
1036             }), 0);
1037         },
1038         getTax: function() {
1039             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1040                 return sum + orderLine.get_tax();
1041             }), 0);
1042         },
1043         getTaxDetails: function(){
1044             var details = {};
1045             var fulldetails = [];
1046             var taxes_by_id = {};
1047
1048             for(var i = 0; i < this.pos.taxes.length; i++){
1049                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
1050             }
1051
1052             this.get('orderLines').each(function(line){
1053                 var ldetails = line.get_tax_details();
1054                 for(var id in ldetails){
1055                     if(ldetails.hasOwnProperty(id)){
1056                         details[id] = (details[id] || 0) + ldetails[id];
1057                     }
1058                 }
1059             });
1060
1061             for(var id in details){
1062                 if(details.hasOwnProperty(id)){
1063                     fulldetails.push({amount: details[id], tax: taxes_by_id[id]});
1064                 }
1065             }
1066
1067             return fulldetails;
1068         },
1069         getPaidTotal: function() {
1070             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
1071                 return sum + paymentLine.get_amount();
1072             }), 0);
1073         },
1074         getChange: function(paymentline) {
1075             if (!paymentline) {
1076                 var change = this.getPaidTotal() - this.getTotalTaxIncluded();
1077             } else {
1078                 var change = -this.getTotalTaxIncluded();
1079                 var lines  = this.get('paymentLines').models;
1080                 for (var i = 0; i < lines.length; i++) {
1081                     change += lines[i].get_amount();
1082                     if (lines[i] === paymentline) {
1083                         break;
1084                     }
1085                 }
1086             }
1087             return round_pr(Math.max(0,change), this.pos.currency.rounding);
1088         },
1089         getDueLeft: function(paymentline) {
1090             if (!paymentline) {
1091                 var due = this.getTotalTaxIncluded() - this.getPaidTotal();
1092             } else {
1093                 var due = this.getTotalTaxIncluded();
1094                 var lines = this.get('paymentLines').models;
1095                 for (var i = 0; i < lines.length; i++) {
1096                     if (lines[i] === paymentline) {
1097                         break;
1098                     } else {
1099                         due -= lines[i].get_amount();
1100                     }
1101                 }
1102             }
1103             return round_pr(Math.max(0,due), this.pos.currency.rounding);
1104         },
1105         isPaid: function(){
1106             return this.getDueLeft() === 0;
1107         },
1108         isPaidWithCash: function(){
1109             return !!this.get('paymentLines').find( function(pl){
1110                 return pl.cashregister.journal.type === 'cash';
1111             });
1112         },
1113         finalize: function(){
1114             this.destroy();
1115         },
1116         // sets the type of receipt 'receipt'(default) or 'invoice'
1117         set_receipt_type: function(type){
1118             this.receipt_type = type;
1119         },
1120         get_receipt_type: function(){
1121             return this.receipt_type;
1122         },
1123         // the client related to the current order.
1124         set_client: function(client){
1125             this.set('client',client);
1126         },
1127         get_client: function(){
1128             return this.get('client');
1129         },
1130         get_client_name: function(){
1131             var client = this.get('client');
1132             return client ? client.name : "";
1133         },
1134         // the order also stores the screen status, as the PoS supports
1135         // different active screens per order. This method is used to
1136         // store the screen status.
1137         set_screen_data: function(key,value){
1138             if(arguments.length === 2){
1139                 this.screen_data[key] = value;
1140             }else if(arguments.length === 1){
1141                 for(key in arguments[0]){
1142                     this.screen_data[key] = arguments[0][key];
1143                 }
1144             }
1145         },
1146         set_to_invoice: function(to_invoice) {
1147             this.to_invoice = to_invoice;
1148         },
1149         is_to_invoice: function(){
1150             return this.to_invoice;
1151         },
1152         // remove all the paymentlines with zero money in it
1153         clean_empty_paymentlines: function() {
1154             var lines = this.get('paymentLines').models;
1155             var empty = [];
1156             for ( var i = 0; i < lines.length; i++) {
1157                 if (!lines[i].get_amount()) {
1158                     empty.push(lines[i]);
1159                 }
1160             }
1161             for ( var i = 0; i < empty.length; i++) {
1162                 this.removePaymentline(empty[i]);
1163             }
1164         },
1165         //see set_screen_data
1166         get_screen_data: function(key){
1167             return this.screen_data[key];
1168         },
1169         // exports a JSON for receipt printing
1170         export_for_printing: function(){
1171             var orderlines = [];
1172             this.get('orderLines').each(function(orderline){
1173                 orderlines.push(orderline.export_for_printing());
1174             });
1175
1176             var paymentlines = [];
1177             this.get('paymentLines').each(function(paymentline){
1178                 paymentlines.push(paymentline.export_for_printing());
1179             });
1180             var client  = this.get('client');
1181             var cashier = this.pos.cashier || this.pos.user;
1182             var company = this.pos.company;
1183             var shop    = this.pos.shop;
1184             var date = new Date();
1185
1186             return {
1187                 orderlines: orderlines,
1188                 paymentlines: paymentlines,
1189                 subtotal: this.getSubtotal(),
1190                 total_with_tax: this.getTotalTaxIncluded(),
1191                 total_without_tax: this.getTotalTaxExcluded(),
1192                 total_tax: this.getTax(),
1193                 total_paid: this.getPaidTotal(),
1194                 total_discount: this.getDiscountTotal(),
1195                 tax_details: this.getTaxDetails(),
1196                 change: this.getChange(),
1197                 name : this.getName(),
1198                 client: client ? client.name : null ,
1199                 invoice_id: null,   //TODO
1200                 cashier: cashier ? cashier.name : null,
1201                 header: this.pos.config.receipt_header || '',
1202                 footer: this.pos.config.receipt_footer || '',
1203                 precision: {
1204                     price: 2,
1205                     money: 2,
1206                     quantity: 3,
1207                 },
1208                 date: {
1209                     year: date.getFullYear(),
1210                     month: date.getMonth(),
1211                     date: date.getDate(),       // day of the month
1212                     day: date.getDay(),         // day of the week
1213                     hour: date.getHours(),
1214                     minute: date.getMinutes() ,
1215                     isostring: date.toISOString(),
1216                     localestring: date.toLocaleString(),
1217                 },
1218                 company:{
1219                     email: company.email,
1220                     website: company.website,
1221                     company_registry: company.company_registry,
1222                     contact_address: company.partner_id[1],
1223                     vat: company.vat,
1224                     name: company.name,
1225                     phone: company.phone,
1226                     logo:  this.pos.company_logo_base64,
1227                 },
1228                 shop:{
1229                     name: shop.name,
1230                 },
1231                 currency: this.pos.currency,
1232             };
1233         },
1234         export_as_JSON: function() {
1235             var orderLines, paymentLines;
1236             orderLines = [];
1237             (this.get('orderLines')).each(_.bind( function(item) {
1238                 return orderLines.push([0, 0, item.export_as_JSON()]);
1239             }, this));
1240             paymentLines = [];
1241             (this.get('paymentLines')).each(_.bind( function(item) {
1242                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1243             }, this));
1244             return {
1245                 name: this.getName(),
1246                 amount_paid: this.getPaidTotal(),
1247                 amount_total: this.getTotalTaxIncluded(),
1248                 amount_tax: this.getTax(),
1249                 amount_return: this.getChange(),
1250                 lines: orderLines,
1251                 statement_ids: paymentLines,
1252                 pos_session_id: this.pos.pos_session.id,
1253                 partner_id: this.get_client() ? this.get_client().id : false,
1254                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1255                 uid: this.uid,
1256                 sequence_number: this.sequence_number,
1257             };
1258         },
1259         getSelectedLine: function(){
1260             return this.selected_orderline;
1261         },
1262         selectLine: function(line){
1263             if(line){
1264                 if(line !== this.selected_orderline){
1265                     if(this.selected_orderline){
1266                         this.selected_orderline.set_selected(false);
1267                     }
1268                     this.selected_orderline = line;
1269                     this.selected_orderline.set_selected(true);
1270                 }
1271             }else{
1272                 this.selected_orderline = undefined;
1273             }
1274         },
1275         deselectLine: function(){
1276             if(this.selected_orderline){
1277                 this.selected_orderline.set_selected(false);
1278                 this.selected_orderline = undefined;
1279             }
1280         },
1281         selectPaymentline: function(line){
1282             if(line !== this.selected_paymentline){
1283                 if(this.selected_paymentline){
1284                     this.selected_paymentline.set_selected(false);
1285                 }
1286                 this.selected_paymentline = line;
1287                 if(this.selected_paymentline){
1288                     this.selected_paymentline.set_selected(true);
1289                 }
1290                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1291             }
1292         },
1293     });
1294
1295     module.OrderCollection = Backbone.Collection.extend({
1296         model: module.Order,
1297     });
1298
1299     /*
1300      The numpad handles both the choice of the property currently being modified
1301      (quantity, price or discount) and the edition of the corresponding numeric value.
1302      */
1303     module.NumpadState = Backbone.Model.extend({
1304         defaults: {
1305             buffer: "0",
1306             mode: "quantity"
1307         },
1308         appendNewChar: function(newChar) {
1309             var oldBuffer;
1310             oldBuffer = this.get('buffer');
1311             if (oldBuffer === '0') {
1312                 this.set({
1313                     buffer: newChar
1314                 });
1315             } else if (oldBuffer === '-0') {
1316                 this.set({
1317                     buffer: "-" + newChar
1318                 });
1319             } else {
1320                 this.set({
1321                     buffer: (this.get('buffer')) + newChar
1322                 });
1323             }
1324             this.trigger('set_value',this.get('buffer'));
1325         },
1326         deleteLastChar: function() {
1327             if(this.get('buffer') === ""){
1328                 if(this.get('mode') === 'quantity'){
1329                     this.trigger('set_value','remove');
1330                 }else{
1331                     this.trigger('set_value',this.get('buffer'));
1332                 }
1333             }else{
1334                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1335                 this.set({ buffer: newBuffer });
1336                 this.trigger('set_value',this.get('buffer'));
1337             }
1338         },
1339         switchSign: function() {
1340             var oldBuffer;
1341             oldBuffer = this.get('buffer');
1342             this.set({
1343                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1344             });
1345             this.trigger('set_value',this.get('buffer'));
1346         },
1347         changeMode: function(newMode) {
1348             this.set({
1349                 buffer: "0",
1350                 mode: newMode
1351             });
1352         },
1353         reset: function() {
1354             this.set({
1355                 buffer: "0",
1356                 mode: "quantity"
1357             });
1358         },
1359         resetValue: function(){
1360             this.set({buffer:'0'});
1361         },
1362     });
1363 }