[FIX] point_of_sale: the receipt would not print correctly on first try

addons/point_of_sale/static/lib/waitfont.js

@@ -0,0 +1,59 @@
+// http://stackoverflow.com/questions/4383226/using-jquery-to-know-when-font-face-fonts-are-loaded
+(function(){
+    function waitForWebfonts(fonts, callback) {
+        var loadedFonts = 0;
+        for(var i = 0, l = fonts.length; i < l; ++i) {
+            (function(font) {
+                var node = document.createElement('span');
+                // Characters that vary significantly among different fonts
+                node.innerHTML = 'giItT1WQy@!-/#';
+                // Visible - so we can measure it - but not on the screen
+                node.style.position      = 'absolute';
+                node.style.left          = '-10000px';
+                node.style.top           = '-10000px';
+                // Large font size makes even subtle changes obvious
+                node.style.fontSize      = '300px';
+                // Reset any font properties
+                node.style.fontFamily    = 'sans-serif';
+                node.style.fontVariant   = 'normal';
+                node.style.fontStyle     = 'normal';
+                node.style.fontWeight    = 'normal';
+                node.style.letterSpacing = '0';
+                document.body.appendChild(node);
+
+                // Remember width with no applied web font
+                var width = node.offsetWidth;
+
+                node.style.fontFamily = font;
+
+                var interval;
+                function checkFont() {
+                    // Compare current width with original width
+                    if(node && node.offsetWidth != width) {
+                        ++loadedFonts;
+                        node.parentNode.removeChild(node);
+                        node = null;
+                    }
+
+                    // If all fonts have been loaded
+                    if(loadedFonts >= fonts.length) {
+                        if(interval) {
+                            clearInterval(interval);
+                        }
+                        if(loadedFonts == fonts.length) {
+                            callback();
+                            return true;
+                        }
+                    }
+                };
+
+                if(!checkFont()) {
+                    interval = setInterval(checkFont, 50);
+                }
+            })(fonts[i]);
+        }
+    }
+    window.waitForWebfonts = waitForWebfonts;
+})();
+
+

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

@@ -277,6 +277,27 @@ function openerp_pos_models(instance, module){ //module is instance.point_of_sal
                 self.cashregisters = bankstatements;
             },
         },{
+            label: 'fonts',
+            loaded: function(self){
+                var fonts_loaded = new $.Deferred();
+
+                // Waiting for fonts to be loaded to prevent receipt printing
+                // from printing empty receipt while loading Inconsolata
+                // ( The font used for the receipt ) 
+                waitForWebfonts(['Lato','Inconsolata'], function(){
+                    fonts_loaded.resolve();
+                });
+
+                // The JS used to detect font loading is not 100% robust, so
+                // do not wait more than 5sec
+                setTimeout(function(){
+                    fonts_loaded.resolve();
+                },5000);
+
+                return fonts_loaded;
+            },
+        },{
+            label: 'pictures',
             loaded: function(self){
                 self.company_logo = new Image();
                 self.company_logo.crossOrigin = 'anonymous';
@@ -327,7 +348,7 @@ function openerp_pos_models(instance, module){ //module is instance.point_of_sal
                     loaded.resolve();
                 }else{
                     var model = self.models[index];
-                    self.pos_widget.loading_message(_t('Loading')+' '+(model.model || ''), progress);
+                    self.pos_widget.loading_message(_t('Loading')+' '+(model.label || model.model || ''), progress);
                     var fields =  typeof model.fields === 'function'  ? model.fields(self,tmp)  : model.fields;
                     var domain =  typeof model.domain === 'function'  ? model.domain(self,tmp)  : model.domain;
                     var context = typeof model.context === 'function' ? model.context(self,tmp) : model.context; 

addons/point_of_sale/views/point_of_sale.xml

@@ -6,6 +6,7 @@
         <template id="assets_backend" name="point_of_sale assets" inherit_id="web.assets_backend">
             <xpath expr="." position="inside">
                 <script type="text/javascript" src="/point_of_sale/static/lib/fastclick.js"></script>
+                <script type="text/javascript" src="/point_of_sale/static/lib/waitfont.js"></script>
                 <script type="text/javascript" src="/point_of_sale/static/src/js/db.js"></script>
                 <script type="text/javascript" src="/point_of_sale/static/src/js/models.js"></script>
                 <script type="text/javascript" src="/point_of_sale/static/src/js/widget_base.js"></script>