Module tui 

TUI Frontend for Calculator

Probar: Visual feedback - Visual feedback through terminal interface

Structs

CalculatorApp

Calculator application state

InputHandler

Input handler that maps key events to actions

Keypad

The keypad layout - a 5x4 grid of buttons

KeypadButton

A single keypad button

KeypadWidget

Keypad widget for rendering

Rect

A rectangle for layout/hit-testing (u16 coordinates, terminal cells).

TextBuffer

A simple text buffer for TUI rendering (replaces ratatui::Buffer).

Enums

ButtonAction

Actions that keypad buttons can perform

KeyAction

Actions that can be triggered by keyboard input

Functions

render_to_buffer

Renders the calculator UI into a TextBuffer