[IMP] pos_restaurant: implement order transferring to different table

Provides a 'Transfer' button in the Point of Sale that allows a user to
select a table to which the current order will be transferred.

addons/pos_restaurant/static/src/js/floors.js

@@ -769,11 +769,29 @@ models.PosModel = models.PosModel.extend({
         return _super_posmodel.initialize.call(this,session,attributes);
     },
 
-    // changes the current table. 
+    transfer_order_to_different_table: function () {
+        this.order_to_transfer_to_different_table = this.get_order();
+
+        // go to 'floors' screen, this will set the order to null and
+        // eventually this will cause the gui to go to its
+        // default_screen, which is 'floors'
+        this.set_table(null);
+    },
+
+    // changes the current table.
     set_table: function(table) {
         if (!table) { // no table ? go back to the floor plan, see ScreenSelector
-            this.set_order(null);   
-        } else {     // table ? load the associated orders  ...
+            this.set_order(null);
+        } else if (this.order_to_transfer_to_different_table) {
+            this.order_to_transfer_to_different_table.table = table;
+            this.order_to_transfer_to_different_table = null;
+
+            // set this table
+            this.set_table(table);
+
+            // trigger a change so the table change gets stored in localStorage
+            this.get_order().trigger('change', this.get_order());
+        } else {
             this.table = table;
             var orders = this.get_order_list();
             if (orders.length) {   
@@ -909,4 +927,19 @@ screens.define_action_button({
     },
 });
 
+var TransferOrderButton = screens.ActionButtonWidget.extend({
+    template: 'TransferOrderButton',
+    button_click: function() {
+        this.pos.transfer_order_to_different_table();
+    },
+});
+
+screens.define_action_button({
+    'name': 'transfer',
+    'widget': TransferOrderButton,
+    'condition': function(){
+        return this.pos.config.iface_floorplan;
+    },
+});
+
 });

addons/pos_restaurant/static/src/xml/floors.xml

@@ -26,6 +26,12 @@
         </div>
     </t>
 
+    <t t-name="TransferOrderButton">
+        <div class='control-button'>
+            <i class='fa fa-arrow-right' /> Transfer
+        </div>
+    </t>
+
     <t t-name="TableWidget">
         <t t-if='!widget.selected'>
             <div class='table' t-att-style='widget.table_style_str()'>