The combos, toast, coleslaw, and sauce is implemented. The extra strips and...

The combos, toast, coleslaw, and sauce is implemented. The extra strips and drinks are not because it would be the same implementation.

main.py

 from kivy.app import App
-from kivy.modules import inspector # For inspection.
-from kivy.core.window import Window # For inspection.
+from kivy.modules import inspector  # For inspection.
+from kivy.core.window import Window  # For inspection.
+from kivy.properties import NumericProperty, BooleanProperty
 
 __app_package__ = 'edu.unl.cse.soft161.order'
 __app__ = 'Order Meal'
@@ -9,9 +10,126 @@ __flags__ = ['--bootstrap=sdl2', '--requirements=python2,kivy', '--orientation=l
 
 
 class OrderApp(App):
+
+    total = NumericProperty(0)
+    sales_tax = NumericProperty(0)
+    subtotal = NumericProperty(0)
+    enable_toast_1 = BooleanProperty(True)
+    enable_toast_2 = BooleanProperty(True)
+    enable_toast_3 = BooleanProperty(True)
+    enable_coleslaw_1 = BooleanProperty(True)
+    enable_coleslaw_2 = BooleanProperty(True)
+    enable_coleslaw_3 = BooleanProperty(True)
+    enable_sauce_1 = BooleanProperty(True)
+    enable_sauce_2 = BooleanProperty(True)
+    enable_sauce_3 = BooleanProperty(True)
+
     def build(self):
-        inspector.create_inspector(Window, self) # For inspection (press control-e to toggle).
+        inspector.create_inspector(Window, self)  # For inspection (press control-e to toggle)
+
+    def disable_toast(self):
+        if self.root.ids.toast_1.active:
+            self.enable_toast_2 = False
+            self.enable_toast_3 = False
+            if self.total >= .01:
+                self.subtotal -= .49
+                self.sales_tax = self.subtotal * .07
+                self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.toast_2.active:
+            self.enable_toast_1 = False
+            self.enable_toast_3 = False
+            self.subtotal += .49
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.toast_3.active:
+            self.enable_toast_1 = False
+            self.enable_toast_2 = False
+            self.subtotal += .49 * 2
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+
+    def disable_coleslaw(self):
+        if self.root.ids.coleslaw_1.active:
+            self.enable_coleslaw_2 = False
+            self.enable_coleslaw_3 = False
+            if self.total >= .01:
+                self.subtotal -= .49
+                self.sales_tax = self.subtotal * .07
+                self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.coleslaw_2.active:
+            self.enable_coleslaw_1 = False
+            self.enable_coleslaw_3 = False
+            self.subtotal += .49
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.coleslaw_3.active:
+            self.enable_coleslaw_1 = False
+            self.enable_coleslaw_2 = False
+            self.subtotal += .49 * 2
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+
+    def disable_sauce(self):
+        if self.root.ids.sauce_1.active:
+            self.enable_sauce_2 = False
+            self.enable_sauce_3 = False
+            if self.total >= .01:
+                self.subtotal -= .29
+                self.sales_tax = self.subtotal * .07
+                self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.sauce_2.active:
+            self.enable_sauce_1 = False
+            self.enable_sauce_3 = False
+            self.subtotal += .29
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.sauce_3.active:
+            self.enable_sauce_1 = False
+            self.enable_sauce_2 = False
+            self.subtotal += .29 * 2
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+
+    def combo(self):
+        if self.root.ids.combo_1.state == 'down':
+            self.subtotal += 6.38
+            self.sales_tax += self.subtotal * .07
+            self.total += self.subtotal + self.sales_tax
+        elif self.root.ids.combo_2.state == 'down':
+            self.subtotal += 5.98
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.combo_3.state == 'down':
+            self.subtotal += 6.98
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
+        elif self.root.ids.combo_4.state == 'down':
+            self.subtotal += 9.98
+            self.sales_tax = self.subtotal * .07
+            self.total = self.subtotal + self.sales_tax
 
+    def reset(self):
+        self.total = 0
+        self.sales_tax = 0
+        self.subtotal = 0
+        self.enable_toast_1 = True
+        self.enable_toast_2 = True
+        self.enable_toast_3 = True
+        self.root.ids.toast_1.active = False
+        self.root.ids.toast_2.active = False
+        self.root.ids.toast_3.active = False
+        self.enable_coleslaw_1 = True
+        self.enable_coleslaw_2 = True
+        self.enable_coleslaw_3 = True
+        self.root.ids.coleslaw_1.active = False
+        self.root.ids.coleslaw_2.active = False
+        self.root.ids.coleslaw_3.active = False
+        self.enable_sauce_1 = True
+        self.enable_sauce_2 = True
+        self.enable_sauce_3 = True
+        self.root.ids.sauce_1.active = False
+        self.root.ids.sauce_2.active = False
+        self.root.ids.sauce_3.active = False
 
 if __name__ == '__main__':
     app = OrderApp()

order.kv

 BoxLayout:
     orientation: 'vertical'
-    Label:
-        text: '[Your meal-ordering GUI here]'
+    BoxLayout:
+        orientation: 'horizontal'
+        BoxLayout:
+            Button:
+                text: 'The Three Finger Combo'
+                id: combo_1
+                on_press: app.combo()
+        BoxLayout:
+            Button:
+                text: 'The Chicken Sandwich Combo'
+                id: combo_2
+                on_press: app.combo()
+    BoxLayout:
+        orientation: 'horizontal'
+        BoxLayout:
+            Button:
+                text: 'The Box Combo'
+                id: combo_3
+                on_press: app.combo()
+        BoxLayout:
+            Button:
+                text: 'The Caniac Combo'
+                id: combo_4
+                on_press: app.combo()
+    BoxLayout:
+        orientation: 'horizontal'
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: 'Toast'
+            BoxLayout:
+                id: toast
+                orientation: 'horizontal'
+                Label:
+                    text: 'No Toast'
+                    font_size: 13.0
+                CheckBox:
+                    id: toast_1
+                    group: 'toast'
+                    disabled: not app.enable_toast_1
+                    on_active: app.disable_toast()
+            BoxLayout:
+                Label:
+                    text: '+1 Toast'
+                    font_size: 13.0
+                CheckBox:
+                    id: toast_2
+                    group: 'toast'
+                    disabled: not app.enable_toast_2
+                    on_active: app.disable_toast()
+            BoxLayout:
+                Label:
+                    text: '+2 Toast'
+                    font_size: 13.0
+                CheckBox:
+                    id: toast_3
+                    group: 'toast'
+                    disabled: not app.enable_toast_3
+                    on_active: app.disable_toast()
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: 'Coleslaw'
+            BoxLayout:
+                orientation: 'horizontal'
+                Label:
+                    text: 'No Coleslaw'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'coleslaw'
+                    id: coleslaw_1
+                    disabled: not app.enable_coleslaw_1
+                    on_active: app.disable_coleslaw()
+            BoxLayout:
+                Label:
+                    text: '+1 Coleslaw'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'coleslaw'
+                    id: coleslaw_2
+                    disabled: not app.enable_coleslaw_2
+                    on_active: app.disable_coleslaw()
+            BoxLayout:
+                Label:
+                    text: '+2 Coleslaw'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'coleslaw'
+                    id: coleslaw_3
+                    disabled: not app.enable_coleslaw_3
+                    on_active: app.disable_coleslaw()
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: 'Sauce'
+            BoxLayout:
+                orientation: 'horizontal'
+                Label:
+                    text: 'No Sauce'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'sauce'
+                    id: sauce_1
+                    disabled: not app.enable_sauce_1
+                    on_active: app.disable_sauce()
+            BoxLayout:
+                Label:
+                    text: '+1 Sauce'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'sauce'
+                    id: sauce_2
+                    disabled: not app.enable_sauce_2
+                    on_active: app.disable_sauce()
+            BoxLayout:
+                Label:
+                    text: '+2 Sauce'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'sauce'
+                    id: sauce_3
+                    disabled: not app.enable_sauce_3
+                    on_active: app.disable_sauce()
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: 'Chicken Strips'
+            BoxLayout:
+                orientation: 'horizontal'
+                Label:
+                    text: '+2 Chicken Strips'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'strips'
+            BoxLayout:
+                Label:
+                    text: '+3 Chicken Strips'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'strips'
+            BoxLayout:
+                Label:
+                    text: '+4 Chicken Strips'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'strips'
+            BoxLayout:
+                orientation: 'horizontal'
+                Label:
+                    text: '+5 Chicken Strips'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'strips'
+            BoxLayout:
+                Label:
+                    text: '+20 Chicken Strips'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'strips'
+            BoxLayout:
+                Label:
+                    text: '+50 Chicken Strips'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'strips'
+        BoxLayout:
+            orientation: 'vertical'
+            Label:
+                text: 'Drink Choice'
+            BoxLayout:
+                orientation: 'horizontal'
+                Label:
+                    text: 'Lemonade'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drinks'
+            BoxLayout:
+                Label:
+                    text: 'Dr. Kelp'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drinks'
+            BoxLayout:
+                Label:
+                    text: 'Diet Dr.Kelp'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drinks'
+            BoxLayout:
+                orientation: 'horizontal'
+                Label:
+                    text: 'Pepsi'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drinks'
+            BoxLayout:
+                Label:
+                    text: 'Diet Pepsi'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drinks'
+            BoxLayout:
+                Label:
+                    text: 'Water'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drinks'
+            BoxLayout:
+                Label:
+                    text: 'Sm'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drink_size'
+                Label:
+                    text: 'Md'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drink_size'
+                Label:
+                    text: 'Lg'
+                    font_size: 13.0
+                CheckBox:
+                    group: 'drink_size'
+    BoxLayout:
+        size_hint_y: .25
+        BoxLayout:
+            Label:
+                text: 'Sales Tax: $' + str('{:0.2f}'.format(app.sales_tax))
+        BoxLayout:
+            Button:
+                text: 'Reset'
+                on_press: app.reset()
+            Button:
+                text: 'Make Order'
+                on_press: app.reset()
+        BoxLayout:
+            Label:
+                text: 'Total: $' + str('{:0.2f}'.format(app.total))