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             ids:    function(self){ return [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             ids:    function(self){ return [self.user.company_id[0]] },
 140             loaded: function(self,companies){ self.company = companies[0]; },
 141         },{
 142             model:  'decimal.precision',
 143             fields: ['name','digits'],
 144             loaded: function(self,dps){
 145                 self.dp  = {};
 146                 for (var i = 0; i < dps.length; i++) {
 147                     self.dp[dps[i].name] = dps[i].digits;
 148                 }
 149             },
 150         },{
 151             model:  'product.uom',
 152             fields: [],
 153             domain: null,
 154             loaded: function(self,units){
 155                 self.units = units;
 156                 var units_by_id = {};
 157                 for(var i = 0, len = units.length; i < len; i++){
 158                     units_by_id[units[i].id] = units[i];
 159                     units[i].groupable = ( units[i].category_id[0] === 1 );
 160                     units[i].is_unit   = ( units[i].id === 1 );
 161                 }
 162                 self.units_by_id = units_by_id;
 163             }
 164         },{
 165             model:  'res.users',
 166             fields: ['name','ean13'],
 167             domain: null,
 168             loaded: function(self,users){ self.users = users; },
 169         },{
 170             model:  'res.partner',
 171             fields: ['name','street','city','state_id','country_id','vat','phone','zip','mobile','email','ean13','write_date'],
 172             domain: null,
 173             loaded: function(self,partners){
 174                 self.partners = partners;
 175                 self.db.add_partners(partners);
 176             },
 177         },{
 178             model:  'res.country',
 179             fields: ['name'],
 180             loaded: function(self,countries){
 181                 self.countries = countries;
 182                 self.company.country = null;
 183                 for (var i = 0; i < countries.length; i++) {
 184                     if (countries[i].id === self.company.country_id[0]){
 185                         self.company.country = countries[i];
 186                     }
 187                 }
 188             },
 189         },{
 190             model:  'account.tax',
 191             fields: ['name','amount', 'price_include', 'type'],
 192             domain: null,
 193             loaded: function(self,taxes){ self.taxes = taxes; },
 194         },{
 195             model:  'pos.session',
 196             fields: ['id', 'journal_ids','name','user_id','config_id','start_at','stop_at','sequence_number','login_number'],
 197             domain: function(self){ return [['state','=','opened'],['user_id','=',self.session.uid]]; },
 198             loaded: function(self,pos_sessions){
 199                 self.pos_session = pos_sessions[0];
 200
 201                 var orders = self.db.get_orders();
 202                 for (var i = 0; i < orders.length; i++) {
 203                     self.pos_session.sequence_number = Math.max(self.pos_session.sequence_number, orders[i].data.sequence_number+1);
 204                 }
 205             },
 206         },{
 207             model: 'pos.config',
 208             fields: [],
 209             domain: function(self){ return [['id','=', self.pos_session.config_id[0]]]; },
 210             loaded: function(self,configs){
 211                 self.config = configs[0];
 212                 self.config.use_proxy = self.config.iface_payment_terminal ||
 213                                         self.config.iface_electronic_scale ||
 214                                         self.config.iface_print_via_proxy  ||
 215                                         self.config.iface_scan_via_proxy   ||
 216                                         self.config.iface_cashdrawer;
 217
 218                 self.barcode_reader.add_barcode_patterns({
 219                     'product':  self.config.barcode_product,
 220                     'cashier':  self.config.barcode_cashier,
 221                     'client':   self.config.barcode_customer,
 222                     'weight':   self.config.barcode_weight,
 223                     'discount': self.config.barcode_discount,
 224                     'price':    self.config.barcode_price,
 225                 });
 226
 227                 if (self.config.company_id[0] !== self.user.company_id[0]) {
 228                     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."));
 229                 }
 230             },
 231         },{
 232             model: 'stock.location',
 233             fields: [],
 234             ids:    function(self){ return [self.config.stock_location_id[0]]; },
 235             loaded: function(self, locations){ self.shop = locations[0]; },
 236         },{
 237             model:  'product.pricelist',
 238             fields: ['currency_id'],
 239             ids:    function(self){ return [self.config.pricelist_id[0]]; },
 240             loaded: function(self, pricelists){ self.pricelist = pricelists[0]; },
 241         },{
 242             model: 'res.currency',
 243             fields: ['symbol','position','rounding','accuracy'],
 244             ids:    function(self){ return [self.pricelist.currency_id[0]]; },
 245             loaded: function(self, currencies){
 246                 self.currency = currencies[0];
 247                 if (self.currency.rounding > 0) {
 248                     self.currency.decimals = Math.ceil(Math.log(1.0 / self.currency.rounding) / Math.log(10));
 249                 } else {
 250                     self.currency.decimals = 0;
 251                 }
 252
 253             },
 254         },{
 255             model: 'product.packaging',
 256             fields: ['ean','product_tmpl_id'],
 257             domain: null,
 258             loaded: function(self, packagings){
 259                 self.db.add_packagings(packagings);
 260             },
 261         },{
 262             model:  'pos.category',
 263             fields: ['id','name','parent_id','child_id','image'],
 264             domain: null,
 265             loaded: function(self, categories){
 266                 self.db.add_categories(categories);
 267             },
 268         },{
 269             model:  'product.product',
 270             fields: ['display_name', 'list_price','price','pos_categ_id', 'taxes_id', 'ean13', 'default_code',
 271                      'to_weight', 'uom_id', 'uos_id', 'uos_coeff', 'mes_type', 'description_sale', 'description',
 272                      'product_tmpl_id'],
 273             domain:  function(self){ return [['sale_ok','=',true],['available_in_pos','=',true]]; },
 274             context: function(self){ return { pricelist: self.pricelist.id, display_default_code: false }; },
 275             loaded: function(self, products){
 276                 self.db.add_products(products);
 277             },
 278         },{
 279             model:  'account.bank.statement',
 280             fields: ['account_id','currency','journal_id','state','name','user_id','pos_session_id'],
 281             domain: function(self){ return [['state', '=', 'open'],['pos_session_id', '=', self.pos_session.id]]; },
 282             loaded: function(self, bankstatements, tmp){
 283                 self.bankstatements = bankstatements;
 284
 285                 tmp.journals = [];
 286                 _.each(bankstatements,function(statement){
 287                     tmp.journals.push(statement.journal_id[0]);
 288                 });
 289             },
 290         },{
 291             model:  'account.journal',
 292             fields: [],
 293             domain: function(self,tmp){ return [['id','in',tmp.journals]]; },
 294             loaded: function(self, journals){
 295                 self.journals = journals;
 296
 297                 // associate the bank statements with their journals.
 298                 var bankstatements = self.bankstatements;
 299                 for(var i = 0, ilen = bankstatements.length; i < ilen; i++){
 300                     for(var j = 0, jlen = journals.length; j < jlen; j++){
 301                         if(bankstatements[i].journal_id[0] === journals[j].id){
 302                             bankstatements[i].journal = journals[j];
 303                         }
 304                     }
 305                 }
 306                 self.cashregisters = bankstatements;
 307             },
 308         },{
 309             label: 'fonts',
 310             loaded: function(self){
 311                 var fonts_loaded = new $.Deferred();
 312                 // Waiting for fonts to be loaded to prevent receipt printing
 313                 // from printing empty receipt while loading Inconsolata
 314                 // ( The font used for the receipt )
 315                 waitForWebfonts(['Lato','Inconsolata'], function(){
 316                     fonts_loaded.resolve();
 317                 });
 318                 // The JS used to detect font loading is not 100% robust, so
 319                 // do not wait more than 5sec
 320                 setTimeout(function(){
 321                     fonts_loaded.resolve();
 322                 },5000);
 323
 324                 return fonts_loaded;
 325             },
 326         },{
 327             label: 'pictures',
 328             loaded: function(self){
 329                 self.company_logo = new Image();
 330                 var  logo_loaded = new $.Deferred();
 331                 self.company_logo.onload = function(){
 332                     var img = self.company_logo;
 333                     var ratio = 1;
 334                     var targetwidth = 300;
 335                     var maxheight = 150;
 336                     if( img.width !== targetwidth ){
 337                         ratio = targetwidth / img.width;
 338                     }
 339                     if( img.height * ratio > maxheight ){
 340                         ratio = maxheight / img.height;
 341                     }
 342                     var width  = Math.floor(img.width * ratio);
 343                     var height = Math.floor(img.height * ratio);
 344                     var c = document.createElement('canvas');
 345                         c.width  = width;
 346                         c.height = height
 347                     var ctx = c.getContext('2d');
 348                         ctx.drawImage(self.company_logo,0,0, width, height);
 349
 350                     self.company_logo_base64 = c.toDataURL();
 351                     logo_loaded.resolve();
 352                 };
 353                 self.company_logo.onerror = function(){
 354                     logo_loaded.reject();
 355                 };
 356                     self.company_logo.crossOrigin = "anonymous";
 357                 self.company_logo.src = '/web/binary/company_logo' +'?_'+Math.random();
 358
 359                 return logo_loaded;
 360             },
 361         },
 362         ],
 363
 364         // loads all the needed data on the sever. returns a deferred indicating when all the data has loaded.
 365         load_server_data: function(){
 366             var self = this;
 367             var loaded = new $.Deferred();
 368             var progress = 0;
 369             var progress_step = 1.0 / self.models.length;
 370             var tmp = {}; // this is used to share a temporary state between models loaders
 371
 372             function load_model(index){
 373                 if(index >= self.models.length){
 374                     loaded.resolve();
 375                 }else{
 376                     var model = self.models[index];
 377                     self.pos_widget.loading_message(_t('Loading')+' '+(model.label || model.model || ''), progress);
 378
 379                     var cond = typeof model.condition === 'function'  ? model.condition(self,tmp) : true;
 380                     if (!cond) {
 381                         load_model(index+1);
 382                         return;
 383                     }
 384
 385                     var fields =  typeof model.fields === 'function'  ? model.fields(self,tmp)  : model.fields;
 386                     var domain =  typeof model.domain === 'function'  ? model.domain(self,tmp)  : model.domain;
 387                     var context = typeof model.context === 'function' ? model.context(self,tmp) : model.context;
 388                     var ids     = typeof model.ids === 'function'     ? model.ids(self,tmp) : model.ids;
 389                     progress += progress_step;
 390
 391
 392                     if( model.model ){
 393                         if (model.ids) {
 394                             var records = new instance.web.Model(model.model).call('read',[ids,fields],context);
 395                         } else {
 396                             var records = new instance.web.Model(model.model).query(fields).filter(domain).context(context).all()
 397                         }
 398                         records.then(function(result){
 399                                 try{    // catching exceptions in model.loaded(...)
 400                                     $.when(model.loaded(self,result,tmp))
 401                                         .then(function(){ load_model(index + 1); },
 402                                               function(err){ loaded.reject(err); });
 403                                 }catch(err){
 404                                     console.error(err.stack);
 405                                     loaded.reject(err);
 406                                 }
 407                             },function(err){
 408                                 loaded.reject(err);
 409                             });
 410                     }else if( model.loaded ){
 411                         try{    // catching exceptions in model.loaded(...)
 412                             $.when(model.loaded(self,tmp))
 413                                 .then(  function(){ load_model(index +1); },
 414                                         function(err){ loaded.reject(err); });
 415                         }catch(err){
 416                             loaded.reject(err);
 417                         }
 418                     }else{
 419                         load_model(index + 1);
 420                     }
 421                 }
 422             }
 423
 424             try{
 425                 load_model(0);
 426             }catch(err){
 427                 loaded.reject(err);
 428             }
 429
 430             return loaded;
 431         },
 432
 433         // reload the list of partner, returns as a deferred that resolves if there were
 434         // updated partners, and fails if not
 435         load_new_partners: function(){
 436             var self = this;
 437             var def  = new $.Deferred();
 438             var fields = _.find(this.models,function(model){ return model.model === 'res.partner'; }).fields;
 439             new instance.web.Model('res.partner')
 440                 .query(fields)
 441                 .filter([['write_date','>',this.db.get_partner_write_date()]])
 442                 .all({'timeout':3000, 'shadow': true})
 443                 .then(function(partners){
 444                     if (self.db.add_partners(partners)) {   // check if the partners we got were real updates
 445                         def.resolve();
 446                     } else {
 447                         def.reject();
 448                     }
 449                 }, function(){ def.reject(); });
 450             return def;
 451         },
 452
 453         // this is called when an order is removed from the order collection. It ensures that there is always an existing
 454         // order and a valid selected order
 455         on_removed_order: function(removed_order,index,reason){
 456             var order_list = this.get_order_list();
 457             if( (reason === 'abandon' || removed_order.temporary) && order_list.length > 0){
 458                 // when we intentionally remove an unfinished order, and there is another existing one
 459                 this.set_order(order_list[index] || order_list[order_list.length -1]);
 460             }else{
 461                 // when the order was automatically removed after completion,
 462                 // or when we intentionally delete the only concurrent order
 463                 this.add_new_order();
 464             }
 465         },
 466
 467         //creates a new empty order and sets it as the current order
 468         add_new_order: function(){
 469             var order = new module.Order({pos:this});
 470             this.get('orders').add(order);
 471             this.set('selectedOrder', order);
 472             return order;
 473         },
 474
 475         // return the current order
 476         get_order: function(){
 477             return this.get('selectedOrder');
 478         },
 479
 480         // change the current order
 481         set_order: function(order){
 482             this.set({ selectedOrder: order });
 483         },
 484
 485         // return the list of unpaid orders
 486         get_order_list: function(){
 487             return this.get('orders').models;
 488         },
 489
 490         //removes the current order
 491         delete_current_order: function(){
 492             var order = this.get_order();
 493             if (order) {
 494                 order.destroy({'reason':'abandon'});
 495             }
 496         },
 497
 498         // saves the order locally and try to send it to the backend.
 499         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 500         push_order: function(order) {
 501             var self = this;
 502
 503             if(order){
 504                 this.proxy.log('push_order',order.export_as_JSON());
 505                 this.db.add_order(order.export_as_JSON());
 506             }
 507
 508             var pushed = new $.Deferred();
 509
 510             this.flush_mutex.exec(function(){
 511                 var flushed = self._flush_orders(self.db.get_orders());
 512
 513                 flushed.always(function(ids){
 514                     pushed.resolve();
 515                 });
 516             });
 517             return pushed;
 518         },
 519
 520         // saves the order locally and try to send it to the backend and make an invoice
 521         // returns a deferred that succeeds when the order has been posted and successfully generated
 522         // an invoice. This method can fail in various ways:
 523         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 524         //     this error is solved
 525         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 526         //     the network connection is up
 527
 528         push_and_invoice_order: function(order){
 529             var self = this;
 530             var invoiced = new $.Deferred();
 531
 532             if(!order.get_client()){
 533                 invoiced.reject('error-no-client');
 534                 return invoiced;
 535             }
 536
 537             var order_id = this.db.add_order(order.export_as_JSON());
 538
 539             this.flush_mutex.exec(function(){
 540                 var done = new $.Deferred(); // holds the mutex
 541
 542                 // send the order to the server
 543                 // we have a 30 seconds timeout on this push.
 544                 // FIXME: if the server takes more than 30 seconds to accept the order,
 545                 // the client will believe it wasn't successfully sent, and very bad
 546                 // things will happen as a duplicate will be sent next time
 547                 // so we must make sure the server detects and ignores duplicated orders
 548
 549                 var transfer = self._flush_orders([self.db.get_order(order_id)], {timeout:30000, to_invoice:true});
 550
 551                 transfer.fail(function(){
 552                     invoiced.reject('error-transfer');
 553                     done.reject();
 554                 });
 555
 556                 // on success, get the order id generated by the server
 557                 transfer.pipe(function(order_server_id){
 558
 559                     // generate the pdf and download it
 560                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 561                         active_ids:order_server_id,
 562                     }});
 563
 564                     invoiced.resolve();
 565                     done.resolve();
 566                 });
 567
 568                 return done;
 569
 570             });
 571
 572             return invoiced;
 573         },
 574
 575         // wrapper around the _save_to_server that updates the synch status widget
 576         _flush_orders: function(orders, options) {
 577             var self = this;
 578             this.set('synch',{ state: 'connecting', pending: orders.length});
 579
 580             return self._save_to_server(orders, options).done(function (server_ids) {
 581                 var pending = self.db.get_orders().length;
 582
 583                 self.set('synch', {
 584                     state: pending ? 'connecting' : 'connected',
 585                     pending: pending
 586                 });
 587
 588                 return server_ids;
 589             });
 590         },
 591
 592         // send an array of orders to the server
 593         // available options:
 594         // - timeout: timeout for the rpc call in ms
 595         // returns a deferred that resolves with the list of
 596         // server generated ids for the sent orders
 597         _save_to_server: function (orders, options) {
 598             if (!orders || !orders.length) {
 599                 var result = $.Deferred();
 600                 result.resolve([]);
 601                 return result;
 602             }
 603
 604             options = options || {};
 605
 606             var self = this;
 607             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 608
 609             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 610             // then we want to notify the user that we are waiting on something )
 611             var posOrderModel = new instance.web.Model('pos.order');
 612             return posOrderModel.call('create_from_ui',
 613                 [_.map(orders, function (order) {
 614                     order.to_invoice = options.to_invoice || false;
 615                     return order;
 616                 })],
 617                 undefined,
 618                 {
 619                     shadow: !options.to_invoice,
 620                     timeout: timeout
 621                 }
 622             ).then(function (server_ids) {
 623                 _.each(orders, function (order) {
 624                     self.db.remove_order(order.id);
 625                 });
 626                 return server_ids;
 627             }).fail(function (error, event){
 628                 if(error.code === 200 ){    // Business Logic Error, not a connection problem
 629                     //if warning do not need to display traceback!!
 630                     if (error.data.exception_type == 'warning') {
 631                         delete error.data.debug;
 632                     }
 633                     self.pos_widget.screen_selector.show_popup('error-traceback',{
 634                         message: error.data.message,
 635                         comment: error.data.debug
 636                     });
 637                 }
 638                 // prevent an error popup creation by the rpc failure
 639                 // we want the failure to be silent as we send the orders in the background
 640                 event.preventDefault();
 641                 console.error('Failed to send orders:', orders);
 642             });
 643         },
 644
 645         scan_product: function(parsed_code){
 646             var self = this;
 647             var selectedOrder = this.get_order();
 648             if(parsed_code.encoding === 'ean13'){
 649                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 650             }else if(parsed_code.encoding === 'reference'){
 651                 var product = this.db.get_product_by_reference(parsed_code.code);
 652             }
 653
 654             if(!product){
 655                 return false;
 656             }
 657
 658             if(parsed_code.type === 'price'){
 659                 selectedOrder.addProduct(product, {price:parsed_code.value});
 660             }else if(parsed_code.type === 'weight'){
 661                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 662             }else if(parsed_code.type === 'discount'){
 663                 selectedOrder.addProduct(product, {discount:parsed_code.value, merge:false});
 664             }else{
 665                 selectedOrder.addProduct(product);
 666             }
 667             return true;
 668         },
 669     });
 670
 671     var orderline_id = 1;
 672
 673     // An orderline represent one element of the content of a client's shopping cart.
 674     // An orderline contains a product, its quantity, its price, discount. etc.
 675     // An Order contains zero or more Orderlines.
 676     module.Orderline = Backbone.Model.extend({
 677         initialize: function(attr,options){
 678             this.pos = options.pos;
 679             this.order = options.order;
 680             this.product = options.product;
 681             this.price   = options.product.price;
 682             this.quantity = 1;
 683             this.quantityStr = '1';
 684             this.discount = 0;
 685             this.discountStr = '0';
 686             this.type = 'unit';
 687             this.selected = false;
 688             this.id       = orderline_id++;
 689         },
 690         clone: function(){
 691             var orderline = new module.Orderline({},{
 692                 pos: this.pos,
 693                 order: null,
 694                 product: this.product,
 695                 price: this.price,
 696             });
 697             orderline.quantity = this.quantity;
 698             orderline.quantityStr = this.quantityStr;
 699             orderline.discount = this.discount;
 700             orderline.type = this.type;
 701             orderline.selected = false;
 702             return orderline;
 703         },
 704         // sets a discount [0,100]%
 705         set_discount: function(discount){
 706             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 707             this.discount = disc;
 708             this.discountStr = '' + disc;
 709             this.trigger('change',this);
 710         },
 711         // returns the discount [0,100]%
 712         get_discount: function(){
 713             return this.discount;
 714         },
 715         get_discount_str: function(){
 716             return this.discountStr;
 717         },
 718         get_product_type: function(){
 719             return this.type;
 720         },
 721         // sets the quantity of the product. The quantity will be rounded according to the
 722         // product's unity of measure properties. Quantities greater than zero will not get
 723         // rounded to zero
 724         set_quantity: function(quantity){
 725             if(quantity === 'remove'){
 726                 this.order.removeOrderline(this);
 727                 return;
 728             }else{
 729                 var quant = parseFloat(quantity) || 0;
 730                 var unit = this.get_unit();
 731                 if(unit){
 732                     if (unit.rounding) {
 733                         this.quantity    = round_pr(quant, unit.rounding);
 734                         this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 735                     } else {
 736                         this.quantity    = round_pr(quant, 1);
 737                         this.quantityStr = this.quantity.toFixed(0);
 738                     }
 739                 }else{
 740                     this.quantity    = quant;
 741                     this.quantityStr = '' + this.quantity;
 742                 }
 743             }
 744             this.trigger('change',this);
 745         },
 746         // return the quantity of product
 747         get_quantity: function(){
 748             return this.quantity;
 749         },
 750         get_quantity_str: function(){
 751             return this.quantityStr;
 752         },
 753         get_quantity_str_with_unit: function(){
 754             var unit = this.get_unit();
 755             if(unit && !unit.is_unit){
 756                 return this.quantityStr + ' ' + unit.name;
 757             }else{
 758                 return this.quantityStr;
 759             }
 760         },
 761         // return the unit of measure of the product
 762         get_unit: function(){
 763             var unit_id = this.product.uom_id;
 764             if(!unit_id){
 765                 return undefined;
 766             }
 767             unit_id = unit_id[0];
 768             if(!this.pos){
 769                 return undefined;
 770             }
 771             return this.pos.units_by_id[unit_id];
 772         },
 773         // return the product of this orderline
 774         get_product: function(){
 775             return this.product;
 776         },
 777         // selects or deselects this orderline
 778         set_selected: function(selected){
 779             this.selected = selected;
 780             this.trigger('change',this);
 781         },
 782         // returns true if this orderline is selected
 783         is_selected: function(){
 784             return this.selected;
 785         },
 786         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 787         // in the orderline. This returns true if it makes sense to merge the two
 788         can_be_merged_with: function(orderline){
 789             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 790                 return false;
 791             }else if(!this.get_unit() || !this.get_unit().groupable){
 792                 return false;
 793             }else if(this.get_product_type() !== orderline.get_product_type()){
 794                 return false;
 795             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 796                 return false;
 797             }else if(this.price !== orderline.price){
 798                 return false;
 799             }else{
 800                 return true;
 801             }
 802         },
 803         merge: function(orderline){
 804             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 805         },
 806         export_as_JSON: function() {
 807             return {
 808                 qty: this.get_quantity(),
 809                 price_unit: this.get_unit_price(),
 810                 discount: this.get_discount(),
 811                 product_id: this.get_product().id,
 812             };
 813         },
 814         //used to create a json of the ticket, to be sent to the printer
 815         export_for_printing: function(){
 816             return {
 817                 quantity:           this.get_quantity(),
 818                 unit_name:          this.get_unit().name,
 819                 price:              this.get_unit_price(),
 820                 discount:           this.get_discount(),
 821                 product_name:       this.get_product().display_name,
 822                 price_display :     this.get_display_price(),
 823                 price_with_tax :    this.get_price_with_tax(),
 824                 price_without_tax:  this.get_price_without_tax(),
 825                 tax:                this.get_tax(),
 826                 product_description:      this.get_product().description,
 827                 product_description_sale: this.get_product().description_sale,
 828             };
 829         },
 830         // changes the base price of the product for this orderline
 831         set_unit_price: function(price){
 832             this.price = round_di(parseFloat(price) || 0, this.pos.dp['Product Price']);
 833             this.trigger('change',this);
 834         },
 835         get_unit_price: function(){
 836             return this.price;
 837         },
 838         get_base_price:    function(){
 839             var rounding = this.pos.currency.rounding;
 840             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 841         },
 842         get_display_price: function(){
 843             return this.get_base_price();
 844         },
 845         get_price_without_tax: function(){
 846             return this.get_all_prices().priceWithoutTax;
 847         },
 848         get_price_with_tax: function(){
 849             return this.get_all_prices().priceWithTax;
 850         },
 851         get_tax: function(){
 852             return this.get_all_prices().tax;
 853         },
 854         get_tax_details: function(){
 855             return this.get_all_prices().taxDetails;
 856         },
 857         get_all_prices: function(){
 858             var self = this;
 859             var currency_rounding = this.pos.currency.rounding;
 860             var base = this.get_base_price();
 861             var totalTax = base;
 862             var totalNoTax = base;
 863
 864             var product =  this.get_product();
 865             var taxes_ids = product.taxes_id;
 866             var taxes =  self.pos.taxes;
 867             var taxtotal = 0;
 868             var taxdetail = {};
 869             _.each(taxes_ids, function(el) {
 870                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 871                 if (tax.price_include) {
 872                     var tmp;
 873                     if (tax.type === "percent") {
 874                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 875                     } else if (tax.type === "fixed") {
 876                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 877                     } else {
 878                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 879                     }
 880                     tmp = round_pr(tmp,currency_rounding);
 881                     taxtotal += tmp;
 882                     totalNoTax -= tmp;
 883                     taxdetail[tax.id] = tmp;
 884                 } else {
 885                     var tmp;
 886                     if (tax.type === "percent") {
 887                         tmp = tax.amount * base;
 888                     } else if (tax.type === "fixed") {
 889                         tmp = tax.amount * self.get_quantity();
 890                     } else {
 891                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 892                     }
 893                     tmp = round_pr(tmp,currency_rounding);
 894                     taxtotal += tmp;
 895                     totalTax += tmp;
 896                     taxdetail[tax.id] = tmp;
 897                 }
 898             });
 899             return {
 900                 "priceWithTax": totalTax,
 901                 "priceWithoutTax": totalNoTax,
 902                 "tax": taxtotal,
 903                 "taxDetails": taxdetail,
 904             };
 905         },
 906     });
 907
 908     module.OrderlineCollection = Backbone.Collection.extend({
 909         model: module.Orderline,
 910     });
 911
 912     // Every Paymentline contains a cashregister and an amount of money.
 913     module.Paymentline = Backbone.Model.extend({
 914         initialize: function(attributes, options) {
 915             this.amount = 0;
 916             this.cashregister = options.cashregister;
 917             this.name = this.cashregister.journal_id[1];
 918             this.selected = false;
 919             this.pos = options.pos;
 920         },
 921         //sets the amount of money on this payment line
 922         set_amount: function(value){
 923             this.amount = round_di(parseFloat(value) || 0, this.pos.currency.decimals);
 924             this.trigger('change:amount',this);
 925         },
 926         // returns the amount of money on this paymentline
 927         get_amount: function(){
 928             return this.amount;
 929         },
 930         get_amount_str: function(){
 931             return this.amount.toFixed(this.pos.currency.decimals);
 932         },
 933         set_selected: function(selected){
 934             if(this.selected !== selected){
 935                 this.selected = selected;
 936                 this.trigger('change:selected',this);
 937             }
 938         },
 939         // returns the associated cashregister
 940         //exports as JSON for server communication
 941         export_as_JSON: function(){
 942             return {
 943                 name: instance.web.datetime_to_str(new Date()),
 944                 statement_id: this.cashregister.id,
 945                 account_id: this.cashregister.account_id[0],
 946                 journal_id: this.cashregister.journal_id[0],
 947                 amount: this.get_amount()
 948             };
 949         },
 950         //exports as JSON for receipt printing
 951         export_for_printing: function(){
 952             return {
 953                 amount: this.get_amount(),
 954                 journal: this.cashregister.journal_id[1],
 955             };
 956         },
 957     });
 958
 959     module.PaymentlineCollection = Backbone.Collection.extend({
 960         model: module.Paymentline,
 961     });
 962
 963
 964     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 965     // plus the associated payment information (the Paymentlines)
 966     // there is always an active ('selected') order in the Pos, a new one is created
 967     // automaticaly once an order is completed and sent to the server.
 968     module.Order = Backbone.Model.extend({
 969         initialize: function(attributes){
 970             Backbone.Model.prototype.initialize.apply(this, arguments);
 971             this.pos = attributes.pos;
 972             this.sequence_number = this.pos.pos_session.sequence_number++;
 973             this.uid =     this.generateUniqueId();
 974             this.set({
 975                 creationDate:   new Date(),
 976                 orderLines:     new module.OrderlineCollection(),
 977                 paymentLines:   new module.PaymentlineCollection(),
 978                 name:           _t("Order ") + this.uid,
 979                 client:         null,
 980             });
 981             this.selected_orderline   = undefined;
 982             this.selected_paymentline = undefined;
 983             this.screen_data = {};  // see ScreenSelector
 984             this.temporary = attributes.temporary || false;
 985             this.to_invoice = false;
 986             return this;
 987         },
 988         is_empty: function(){
 989             return (this.get('orderLines').models.length === 0);
 990         },
 991
 992         // Generates a public identification number for the order.
 993         // The generated number must be unique and sequential. They are made 12 digit long
 994         // to fit into EAN-13 barcodes, should it be needed
 995         generateUniqueId: function() {
 996             function zero_pad(num,size){
 997                 var s = ""+num;
 998                 while (s.length < size) {
 999                     s = "0" + s;
1000                 }
1001                 return s;
1002             }
1003             return zero_pad(this.pos.pos_session.id,5) +'-'+
1004                    zero_pad(this.pos.pos_session.login_number,3) +'-'+
1005                    zero_pad(this.sequence_number,4);
1006         },
1007         addOrderline: function(line){
1008             if(line.order){
1009                 order.removeOrderline(line);
1010             }
1011             line.order = this;
1012             this.get('orderLines').add(line);
1013             this.selectLine(this.getLastOrderline());
1014         },
1015         addProduct: function(product, options){
1016             options = options || {};
1017             var attr = JSON.parse(JSON.stringify(product));
1018             attr.pos = this.pos;
1019             attr.order = this;
1020             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
1021
1022             if(options.quantity !== undefined){
1023                 line.set_quantity(options.quantity);
1024             }
1025             if(options.price !== undefined){
1026                 line.set_unit_price(options.price);
1027             }
1028             if(options.discount !== undefined){
1029                 line.set_discount(options.discount);
1030             }
1031
1032             var last_orderline = this.getLastOrderline();
1033             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
1034                 last_orderline.merge(line);
1035             }else{
1036                 this.get('orderLines').add(line);
1037             }
1038             this.selectLine(this.getLastOrderline());
1039         },
1040         removeOrderline: function( line ){
1041             this.get('orderLines').remove(line);
1042             this.selectLine(this.getLastOrderline());
1043         },
1044         getOrderline: function(id){
1045             var orderlines = this.get('orderLines').models;
1046             for(var i = 0; i < orderlines.length; i++){
1047                 if(orderlines[i].id === id){
1048                     return orderlines[i];
1049                 }
1050             }
1051             return null;
1052         },
1053         getLastOrderline: function(){
1054             return this.get('orderLines').at(this.get('orderLines').length -1);
1055         },
1056         addPaymentline: function(cashregister) {
1057             var paymentLines = this.get('paymentLines');
1058             var newPaymentline = new module.Paymentline({},{cashregister:cashregister, pos:this.pos});
1059             if(cashregister.journal.type !== 'cash'){
1060                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
1061             }
1062             paymentLines.add(newPaymentline);
1063             this.selectPaymentline(newPaymentline);
1064
1065         },
1066         removePaymentline: function(line){
1067             if(this.selected_paymentline === line){
1068                 this.selectPaymentline(undefined);
1069             }
1070             this.get('paymentLines').remove(line);
1071         },
1072         getName: function() {
1073             return this.get('name');
1074         },
1075         getSubtotal : function(){
1076             return (this.get('orderLines')).reduce((function(sum, orderLine){
1077                 return sum + orderLine.get_display_price();
1078             }), 0);
1079         },
1080         getTotalTaxIncluded: function() {
1081             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1082                 return sum + orderLine.get_price_with_tax();
1083             }), 0);
1084         },
1085         getDiscountTotal: function() {
1086             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1087                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
1088             }), 0);
1089         },
1090         getTotalTaxExcluded: function() {
1091             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1092                 return sum + orderLine.get_price_without_tax();
1093             }), 0);
1094         },
1095         getTax: function() {
1096             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1097                 return sum + orderLine.get_tax();
1098             }), 0);
1099         },
1100         getTaxDetails: function(){
1101             var details = {};
1102             var fulldetails = [];
1103             var taxes_by_id = {};
1104
1105             for(var i = 0; i < this.pos.taxes.length; i++){
1106                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
1107             }
1108
1109             this.get('orderLines').each(function(line){
1110                 var ldetails = line.get_tax_details();
1111                 for(var id in ldetails){
1112                     if(ldetails.hasOwnProperty(id)){
1113                         details[id] = (details[id] || 0) + ldetails[id];
1114                     }
1115                 }
1116             });
1117
1118             for(var id in details){
1119                 if(details.hasOwnProperty(id)){
1120                     fulldetails.push({amount: details[id], tax: taxes_by_id[id], name: taxes_by_id[id].name});
1121                 }
1122             }
1123
1124             return fulldetails;
1125         },
1126         getPaidTotal: function() {
1127             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
1128                 return sum + paymentLine.get_amount();
1129             }), 0);
1130         },
1131         getChange: function(paymentline) {
1132             if (!paymentline) {
1133                 var change = this.getPaidTotal() - this.getTotalTaxIncluded();
1134             } else {
1135                 var change = -this.getTotalTaxIncluded();
1136                 var lines  = this.get('paymentLines').models;
1137                 for (var i = 0; i < lines.length; i++) {
1138                     change += lines[i].get_amount();
1139                     if (lines[i] === paymentline) {
1140                         break;
1141                     }
1142                 }
1143             }
1144             return round_pr(Math.max(0,change), this.pos.currency.rounding);
1145         },
1146         getDueLeft: function(paymentline) {
1147             if (!paymentline) {
1148                 var due = this.getTotalTaxIncluded() - this.getPaidTotal();
1149             } else {
1150                 var due = this.getTotalTaxIncluded();
1151                 var lines = this.get('paymentLines').models;
1152                 for (var i = 0; i < lines.length; i++) {
1153                     if (lines[i] === paymentline) {
1154                         break;
1155                     } else {
1156                         due -= lines[i].get_amount();
1157                     }
1158                 }
1159             }
1160             return round_pr(Math.max(0,due), this.pos.currency.rounding);
1161         },
1162         isPaid: function(){
1163             return this.getDueLeft() === 0;
1164         },
1165         isPaidWithCash: function(){
1166             return !!this.get('paymentLines').find( function(pl){
1167                 return pl.cashregister.journal.type === 'cash';
1168             });
1169         },
1170         finalize: function(){
1171             this.destroy();
1172         },
1173         set_to_invoice: function(to_invoice) {
1174             this.to_invoice = to_invoice;
1175         },
1176         is_to_invoice: function(){
1177             return this.to_invoice;
1178         },
1179         // remove all the paymentlines with zero money in it
1180         clean_empty_paymentlines: function() {
1181             var lines = this.get('paymentLines').models;
1182             var empty = [];
1183             for ( var i = 0; i < lines.length; i++) {
1184                 if (!lines[i].get_amount()) {
1185                     empty.push(lines[i]);
1186                 }
1187             }
1188             for ( var i = 0; i < empty.length; i++) {
1189                 this.removePaymentline(empty[i]);
1190             }
1191         },
1192         // the client related to the current order.
1193         set_client: function(client){
1194             this.set('client',client);
1195         },
1196         get_client: function(){
1197             return this.get('client');
1198         },
1199         get_client_name: function(){
1200             var client = this.get('client');
1201             return client ? client.name : "";
1202         },
1203         // the order also stores the screen status, as the PoS supports
1204         // different active screens per order. This method is used to
1205         // store the screen status.
1206         set_screen_data: function(key,value){
1207             if(arguments.length === 2){
1208                 this.screen_data[key] = value;
1209             }else if(arguments.length === 1){
1210                 for(key in arguments[0]){
1211                     this.screen_data[key] = arguments[0][key];
1212                 }
1213             }
1214         },
1215         set_to_invoice: function(to_invoice) {
1216             this.to_invoice = to_invoice;
1217         },
1218         is_to_invoice: function(){
1219             return this.to_invoice;
1220         },
1221         // remove all the paymentlines with zero money in it
1222         clean_empty_paymentlines: function() {
1223             var lines = this.get('paymentLines').models;
1224             var empty = [];
1225             for ( var i = 0; i < lines.length; i++) {
1226                 if (!lines[i].get_amount()) {
1227                     empty.push(lines[i]);
1228                 }
1229             }
1230             for ( var i = 0; i < empty.length; i++) {
1231                 this.removePaymentline(empty[i]);
1232             }
1233         },
1234         //see set_screen_data
1235         get_screen_data: function(key){
1236             return this.screen_data[key];
1237         },
1238         // exports a JSON for receipt printing
1239         export_for_printing: function(){
1240             var orderlines = [];
1241             this.get('orderLines').each(function(orderline){
1242                 orderlines.push(orderline.export_for_printing());
1243             });
1244
1245             var paymentlines = [];
1246             this.get('paymentLines').each(function(paymentline){
1247                 paymentlines.push(paymentline.export_for_printing());
1248             });
1249             var client  = this.get('client');
1250             var cashier = this.pos.cashier || this.pos.user;
1251             var company = this.pos.company;
1252             var shop    = this.pos.shop;
1253             var date = new Date();
1254
1255             return {
1256                 orderlines: orderlines,
1257                 paymentlines: paymentlines,
1258                 subtotal: this.getSubtotal(),
1259                 total_with_tax: this.getTotalTaxIncluded(),
1260                 total_without_tax: this.getTotalTaxExcluded(),
1261                 total_tax: this.getTax(),
1262                 total_paid: this.getPaidTotal(),
1263                 total_discount: this.getDiscountTotal(),
1264                 tax_details: this.getTaxDetails(),
1265                 change: this.getChange(),
1266                 name : this.getName(),
1267                 client: client ? client.name : null ,
1268                 invoice_id: null,   //TODO
1269                 cashier: cashier ? cashier.name : null,
1270                 header: this.pos.config.receipt_header || '',
1271                 footer: this.pos.config.receipt_footer || '',
1272                 precision: {
1273                     price: 2,
1274                     money: 2,
1275                     quantity: 3,
1276                 },
1277                 date: {
1278                     year: date.getFullYear(),
1279                     month: date.getMonth(),
1280                     date: date.getDate(),       // day of the month
1281                     day: date.getDay(),         // day of the week
1282                     hour: date.getHours(),
1283                     minute: date.getMinutes() ,
1284                     isostring: date.toISOString(),
1285                     localestring: date.toLocaleString(),
1286                 },
1287                 company:{
1288                     email: company.email,
1289                     website: company.website,
1290                     company_registry: company.company_registry,
1291                     contact_address: company.partner_id[1],
1292                     vat: company.vat,
1293                     name: company.name,
1294                     phone: company.phone,
1295                     logo:  this.pos.company_logo_base64,
1296                 },
1297                 shop:{
1298                     name: shop.name,
1299                 },
1300                 currency: this.pos.currency,
1301             };
1302         },
1303         export_as_JSON: function() {
1304             var orderLines, paymentLines;
1305             orderLines = [];
1306             (this.get('orderLines')).each(_.bind( function(item) {
1307                 return orderLines.push([0, 0, item.export_as_JSON()]);
1308             }, this));
1309             paymentLines = [];
1310             (this.get('paymentLines')).each(_.bind( function(item) {
1311                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1312             }, this));
1313             return {
1314                 name: this.getName(),
1315                 amount_paid: this.getPaidTotal(),
1316                 amount_total: this.getTotalTaxIncluded(),
1317                 amount_tax: this.getTax(),
1318                 amount_return: this.getChange(),
1319                 lines: orderLines,
1320                 statement_ids: paymentLines,
1321                 pos_session_id: this.pos.pos_session.id,
1322                 partner_id: this.get_client() ? this.get_client().id : false,
1323                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1324                 uid: this.uid,
1325                 sequence_number: this.sequence_number,
1326             };
1327         },
1328         getSelectedLine: function(){
1329             return this.selected_orderline;
1330         },
1331         selectLine: function(line){
1332             if(line){
1333                 if(line !== this.selected_orderline){
1334                     if(this.selected_orderline){
1335                         this.selected_orderline.set_selected(false);
1336                     }
1337                     this.selected_orderline = line;
1338                     this.selected_orderline.set_selected(true);
1339                 }
1340             }else{
1341                 this.selected_orderline = undefined;
1342             }
1343         },
1344         deselectLine: function(){
1345             if(this.selected_orderline){
1346                 this.selected_orderline.set_selected(false);
1347                 this.selected_orderline = undefined;
1348             }
1349         },
1350         selectPaymentline: function(line){
1351             if(line !== this.selected_paymentline){
1352                 if(this.selected_paymentline){
1353                     this.selected_paymentline.set_selected(false);
1354                 }
1355                 this.selected_paymentline = line;
1356                 if(this.selected_paymentline){
1357                     this.selected_paymentline.set_selected(true);
1358                 }
1359                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1360             }
1361         },
1362     });
1363
1364     module.OrderCollection = Backbone.Collection.extend({
1365         model: module.Order,
1366     });
1367
1368     /*
1369      The numpad handles both the choice of the property currently being modified
1370      (quantity, price or discount) and the edition of the corresponding numeric value.
1371      */
1372     module.NumpadState = Backbone.Model.extend({
1373         defaults: {
1374             buffer: "0",
1375             mode: "quantity"
1376         },
1377         appendNewChar: function(newChar) {
1378             var oldBuffer;
1379             oldBuffer = this.get('buffer');
1380             if (oldBuffer === '0') {
1381                 this.set({
1382                     buffer: newChar
1383                 });
1384             } else if (oldBuffer === '-0') {
1385                 this.set({
1386                     buffer: "-" + newChar
1387                 });
1388             } else {
1389                 this.set({
1390                     buffer: (this.get('buffer')) + newChar
1391                 });
1392             }
1393             this.trigger('set_value',this.get('buffer'));
1394         },
1395         deleteLastChar: function() {
1396             if(this.get('buffer') === ""){
1397                 if(this.get('mode') === 'quantity'){
1398                     this.trigger('set_value','remove');
1399                 }else{
1400                     this.trigger('set_value',this.get('buffer'));
1401                 }
1402             }else{
1403                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1404                 this.set({ buffer: newBuffer });
1405                 this.trigger('set_value',this.get('buffer'));
1406             }
1407         },
1408         switchSign: function() {
1409             var oldBuffer;
1410             oldBuffer = this.get('buffer');
1411             this.set({
1412                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1413             });
1414             this.trigger('set_value',this.get('buffer'));
1415         },
1416         changeMode: function(newMode) {
1417             this.set({
1418                 buffer: "0",
1419                 mode: newMode
1420             });
1421         },
1422         reset: function() {
1423             this.set({
1424                 buffer: "0",
1425                 mode: "quantity"
1426             });
1427         },
1428         resetValue: function(){
1429             this.set({buffer:'0'});
1430         },
1431     });
1432 }