5. Add Radio Buttons for pizza sizes and OptionMenu for quantity

• Objective: Add radio buttons for selecting pizza sizes and the OptionMenu for quantity.

• Content:

  • Creating and positioning radio buttons for Pizza sizes.

  • Introduction to OptionMenu.

  • Creating and positioning the OptionMenu for selecting the quantity of pizzas.

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5.1. Creating and Positioning Radio Buttons for Pizza Sizes

Place the following code below the other widget code in Section "4. TKINTER WIDGETS".

This code sets up a GUI for selecting a pizza size using radio buttons.

The selected pizza size is stored in the size_var variable.

The pack method ensures that the radio buttons are neatly aligned within the size_frame, making the GUI intuitive and easy to use.

# Pizza Size (Radio buttons)
size_label = tk.Label(root, text="Pizza Size:")
size_label.grid(row=2, column=0, padx=10, pady=5, sticky="ne")

size_var = tk.StringVar(root)
size_var.set("Small")

size_frame = tk.Frame(root)
size_frame.grid(row=2, column=1, padx=10, pady=5, sticky="w")

for size in ["Small", "Medium", "Large"]:
    radio_button = tk.Radiobutton(size_frame, text=size, variable=size_var, value=size)
    radio_button.pack(anchor="w")

1. Label Creation:

   pizza_label = tk.Label(root, text="Pizza Size:")
   pizza_label.grid(row=2, column=0, padx=10, pady=5, sticky="ne")
   

   • This line creates a label widget with the text "Pizza Size:".

   • The grid method places the label in the third row (row=2), first column (column=0) of the grid layout.

   • padx and pady add padding around the label for better spacing.

   • sticky="ne" aligns the label to the northeast (top-right) of its grid cell.

2. StringVar Initialization:

   size_var = tk.StringVar(root)
   size_var.set("Small")
   

   • size_var is a StringVar object that holds the value of the selected pizza size.

   • size_var.set("Small") sets the default value to "Small".

3. Frame Creation:

   size_frame = tk.Frame(root)
   size_frame.grid(row=2, column=1, padx=10, pady=5, sticky="w")
   

   • This creates a frame widget to contain the radio buttons.

   • The grid method places the frame in the third row (row=2), second column (column=1) of the grid layout.

   • sticky="w" aligns the frame to the west (left side) of its grid cell.

4. Radio Buttons Creation:

   for size in ["Small", "Medium", "Large"]:
           radio_button = tk.Radiobutton(size_frame, text=size, variable=size_var, value=size)
           radio_button.pack(anchor="w")
   

   • This loop creates a radio button for each pizza size in the list.

   • Each Radiobutton is placed inside size_frame.

   • text=size sets the label of the radio button.

   • variable=size_var links the radio button to the size_var variable.

   • value=size sets the value of size_var when the radio button is selected.

   • pack(anchor="w") arranges the radio buttons vertically, aligned to the left.

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5.2. Creating and Positioning the OptionMenu

Place the following code below the other widget code in Section "4. TKINTER WIDGETS".

This code sets up a GUI for selecting a quantity using an OptionMenu.

OptionMenu is a dropdown menu that allows users to select one option from a list of quantities of pizzas.

The selected quantity is stored in the quantity_var variable.

The grid method ensures that the label and the OptionMenu are neatly aligned within the grid layout.

# Quantity (Dropdown Menu)
quanitity_label = tk.Label(root, text="Quantity:")
quanitity_label.grid(row=3, column=0, padx=10, pady=5, sticky="e")
quantity_var = tk.IntVar(root)
quantity_var.set(1)

quantity_menu = tk.OptionMenu(root, quantity_var, 1, 2, 3, 4, 5, 6)
quantity_menu.grid(row=3, column=1, padx=10, pady=5, sticky="w")

1. Label Creation:

   quanitity_label = tk.Label(root, text="Quantity:")
   quanitity_label.grid(row=3, column=0, padx=10, pady=5, sticky="e")
   

   • This line creates a label widget with the text "Quantity:".

   • The grid method places the label in the fourth row (row=3), first column (column=0) of the grid layout.

   • padx and pady add padding around the label for better spacing.

   • sticky="e" aligns the label to the east (right side) of its grid cell.

2. IntVar Initialization:

   See: https://python-course.eu/tkinter/variable-classes-in-tkinter.php

   quantity_var = tk.IntVar(root)
   quantity_var.set(1)
   

   • quantity_var is a IntVar object that holds the value of the selected quantity, as an integer.

   • quantity_var.set(1) sets the default value to 1.

3. OptionMenu Creation:

   quantity_menu = tk.OptionMenu(root, quantity_var, 1, 2, 3, 4, 5, 6)
   quantity_menu.grid(row=3, column=1, padx=10, pady=5, sticky="w")
   

   • This creates an OptionMenu widget for selecting a quantity.

   • The OptionMenu is associated with the root window and linked to the quantity_var variable.

   • The options available in the menu are 1, 2, 3, 4, 5 and 6.

   • The grid method places the OptionMenu in the fourth row (row=3), second column (column=1) of the grid layout.

   • padx and pady add padding around the menu for better spacing.

   • sticky="w" aligns the menu to the west (left side) of its grid cell.