Class: Charming::Presentation::Components::TextInput

Inherits:
Charming::Presentation::Component show all
Includes:
KeyboardHandler
Defined in:
lib/charming/presentation/components/text_input.rb

Overview

TextInput is a single-line text editor component. Supports printable character insertion, cursor movement (left/right/home/end), and deletion (backspace/delete). The component exposes its ‘value` and `cursor` positions as reader methods; when an explicit `width:` is given, the rendered output is padded to that width via a UI::Style.

Constant Summary collapse

KEY_ACTIONS =

Maps editing keys (left/right/home/end/backspace/delete) to the instance methods they dispatch via KeyboardHandler. Each symbol key (e.g., :left) maps to a method (e.g., :move_left) that adjusts cursor position or text content.

{
  left: :move_left,
  right: :move_right,
  home: :move_home,
  end: :move_end,
  backspace: :delete_before_cursor,
  delete: :delete_at_cursor
}.freeze

Constants included from KeyboardHandler

KeyboardHandler::VIM_KEYMAP

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from View

#focused?, #layout_assigns

Constructor Details

#initialize(value: "", placeholder: "", width: nil, cursor: nil) ⇒ TextInput

value is the initial text. placeholder is shown when the value is empty. width optionally constrains the rendered output width; cursor defaults to the end.



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# File 'lib/charming/presentation/components/text_input.rb', line 30

def initialize(value: "", placeholder: "", width: nil, cursor: nil)
  super()
  @value = value.dup
  @placeholder = placeholder
  @width = width
  @cursor = cursor || @value.length
  clamp_position
end

Instance Attribute Details

#cursor ⇒ Object (readonly)

The current input string and the byte offset of the cursor within it.



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# File 'lib/charming/presentation/components/text_input.rb', line 26

def cursor
  @cursor
end

#value ⇒ Object (readonly)

The current input string and the byte offset of the cursor within it.



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# File 'lib/charming/presentation/components/text_input.rb', line 26

def value
  @value
end

Instance Method Details

#handle_key(event) ⇒ Object

Handles key events. Inserts printable characters, otherwise dispatches via KEY_ACTIONS. Returns :handled when the event was consumed, nil otherwise.



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# File 'lib/charming/presentation/components/text_input.rb', line 41

def handle_key(event)
  return :handled if character_event?(event) && insert(event.char)

  super
end

#render ⇒ Object

Renders the value with a cursor marker. When width was given at construction, the output is padded to that width via the configured style.



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# File 'lib/charming/presentation/components/text_input.rb', line 49

def render
  rendered = render_value
  @width ? style.width(@width).render(rendered) : rendered
end