Class: Charming::Presentation::Layout::Builder

Inherits:
Object
  • Object
show all
Defined in:
lib/charming/presentation/layout/builder.rb

Overview

Builder turns a declarative ‘screen_layout { … }` block into a layout tree of ScreenLayout → Split → Pane nodes. The block DSL is `split(direction) { … }`, `pane(name) { … }`, and `overlay { … }`. Unknown method calls in the block are forwarded to the underlying view so view helpers (e.g., `text`) work inside layout blocks.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(screen:, view:, background: nil) ⇒ Builder

Returns a new instance of Builder.



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# File 'lib/charming/presentation/layout/builder.rb', line 17

def initialize(screen:, view:, background: nil)
  @view = view
  @root = ScreenLayout.new(screen: screen, background: background)
  @stack = [@root]
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name) ⇒ Object 



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# File 'lib/charming/presentation/layout/builder.rb', line 59

def method_missing(name, ...)
  return view.__send__(name, ...) if view.respond_to?(name, true)

  super
end

Class Method Details

.build(screen:, view:, background: nil) ⇒ Object

Builds the layout tree by evaluating the block in the builder’s context. Returns the root ScreenLayout node.



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# File 'lib/charming/presentation/layout/builder.rb', line 13

def self.build(screen:, view:, background: nil, &)
  new(screen: screen, view: view, background: background).build(&)
end

Instance Method Details

#build ⇒ Object

Evaluates block in the builder’s context, then returns the root ScreenLayout node.



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# File 'lib/charming/presentation/layout/builder.rb', line 24

def build(&)
  instance_eval(&) if block_given?
  root
end

#overlay(content = nil, top: :center, left: :center, **options, &block) ⇒ Object

Adds an Overlay node to the root ScreenLayout. top and left default to :center. The block, if given, is evaluated in the view’s context.



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# File 'lib/charming/presentation/layout/builder.rb', line 49

def overlay(content = nil, top: :center, left: :center, **options, &block)
  root.add_overlay(Overlay.new(content: content, block: block, view: view, top: top, left: left, **options))
end

#pane(name = nil, content = nil, **options, &block) ⇒ Object

Adds a Pane leaf node to the current scope. name (optional) is the focus slot name; content (or a block) is the body. options are forwarded to Pane.



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# File 'lib/charming/presentation/layout/builder.rb', line 41

def pane(name = nil, content = nil, **options, &block)
  node = Pane.new(name: name, content: content, block: block, view: view, **options)
  append(node)
  node
end

#respond_to_missing?(name, include_private = false) ⇒ Boolean

Forwards unknown method calls to the underlying view so helpers like ‘text` work inside layout blocks.

Returns:

  • (Boolean) 


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# File 'lib/charming/presentation/layout/builder.rb', line 55

def respond_to_missing?(name, include_private = false)
  view.respond_to?(name, include_private) || super
end

#split(direction, gap: 0, **options) ⇒ Object

Adds a Split node to the current scope. direction is ‘:horizontal` or `:vertical`. gap (in cells) is inserted between children. Additional options are forwarded to Split. The block, if given, is evaluated in the split’s scope (for nested children).



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# File 'lib/charming/presentation/layout/builder.rb', line 32

def split(direction, gap: 0, **options, &)
  node = Split.new(direction: direction, gap: gap, **options)
  append(node)
  within(node, &)
  node
end