controller.py 文件源码

def addToBuyList(self, obj):
        if(self.pos_system.getBuyList() == None):
            content = Label(text = 'You need to start a new list!')
            popup = Popup(
                        title           = 'No Buy List',
                        content         = content,
                        size_hint       = (None, None),
                        size            = (400, 100)
                    )

            # open the popup
            popup.open()
            return

        button = Button(text=obj.text, size_hint_y = None, height = 40)
        button.bind(on_press = self.removeFromBuyList)
        self.a_buylist.add_widget(button)
        self.pos_system.getBuyList().addItem(obj.item)
        self.updateTotalPrice()

    ###