CALCULATOR APP

Description:

Calculator application with the iPhone design built in Python 3.10.6 using MVC (Model View Controller).

Use:

• Require Python 3.10 to execute it.

Structure:

     ┏━━━━━━━━┓        ┏━━━━━━━━━━┓        ┏━━━━━━━━┓
     ┃ Model  ┣━━━━━━━━┫Controller┣━━━━━━━━┫  View  ┃
     ┗━━━━━━━━┛       ║┗━━━━━━━━━━┛║       ┗━━━━━━━━┛
                      ║    Main    ║      ● _configure_button_styles
    ● Calculate       ╚════════════╝      ● main
    ● _evaluate       ● main              ● _make_main_frame
 		      ● on_button_click   ● _make_label
		                          ● _make_buttons
                                          ● _is_operator
                                          ● _center_window

Files:

main.py:

Initiate the app calling the controller main.

controler.py:

Manage the view and the model of the app.

Instance Model and View class.

main(funcion): call view main function, which execute the GUI render. on_button_click(function): Send pressed buttons from the model to the view.

model.py

Initiate previous_value: save the value before press next button. Initiate value: the current value. Initiate operator: the operator value.

calculate(function): Conditional list in base which operator was pressed, to apply a determinate mathematic effect.

• caption == 'C': Reset values of previous_value, value, operator.
• caption == '+/-': Add - character in 0 position if it don't exist. If exist, remove it.
• caption == '%': Move units to left (nº/100).
• caption == '=': Call _evaluate function.
• caption == '.': Create a point if doesn't exist before.
• caption == nº: Add the caption to value
• If other case: If exist value, previous_value = value and operator = caption. Reset value

_evaluate(function): Is called when the caption in calculate = =. With previous_value and value make a mathematic operation with the operator saved.

view.py

Draw the windows interface for the app.

Initiate PAD: with 10 value for padding inside of the screen. Initiate MAX_BUTTONS_PER_ROW: with 4, name of button rows. Initiate button_captions: With tuple of symbols to print it as button characters.

Instance controller. Initiate title as "PyCalculator 1.0". Inititate background to black. Initiate _configure_button_styles, _make_main_frame, _make_label, _make_buttons, _center_window functions.

_configure_button_styles(function): Define different styles for each button type.

main(function): Inititate the Tkinter screen.

_make_main_frame(function): Create a screen and apply the indor padding with PAD.

_make_buttons(function): Draw the different buttons with a determinate style in base the button type.

_is_operator(function): Return true if a chart is locatet inside of a tuple. To determinte a type of button.

_center_window(function): Get information about the screen size and place the window in the middle of the screen.