Class: TemplateBinding

Inherits:
BaseBinding show all
Defined in:
lib/volt/templates/template_binding.rb

Instance Attribute Summary

Attributes inherited from BaseBinding

#binding_name, #context, #target

Instance Method Summary collapse

Methods inherited from BaseBinding

#queue_update, #remove_anchors, #section, #value_from_getter

Constructor Details

#initialize(target, context, binding_name, binding_in_path, getter) ⇒ TemplateBinding

Returns a new instance of TemplateBinding.



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# File 'lib/volt/templates/template_binding.rb', line 5

def initialize(target, context, binding_name, binding_in_path, getter)
  # puts "New template binding: #{context.inspect} - #{binding_name.inspect} - #{getter.inspect}"
  super(target, context, binding_name)
  
  # Binding in path is the path for the template this binding is in
  setup_path(binding_in_path)

  @current_template = nil
  
  # puts "GETTER: #{value_from_getter(getter).inspect}"

  # Find the source for the getter binding
  @path, section = value_from_getter(getter)
  
  if section.is_a?(String)
    # Render this as a section
    @section = section
  else
    # Use the value passed in as the default model
    @model = section
  end

  # Run the initial render
  update

  @path_changed_listener = @path.on('changed') { update } if @path.reactive?
  @section_changed_listener = @section.on('changed') { update } if @section && @section.reactive?
end

Instance Method Details

#check_for_template?(path) ⇒ Boolean

Returns true if there is a template at the path

Returns:



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# File 'lib/volt/templates/template_binding.rb', line 42

def check_for_template?(path)
  $page.templates[path]
end

#path_for_template(lookup_path, force_section = nil) ⇒ Object

Takes in a lookup path and returns the full path for the matching template. Also returns the controller name if applicable.

Looking up a path is fairly simple. There are 4 parts needed to find the html to be rendered. File paths look like this: app/component/views/controller_name/view.html Within the html file may be one or more sections.

  1. component (app/comp)

  2. controller

  3. view

  4. sections

When searching for a file, the lookup starts at the section, and moves up. when moving up, default values are provided for the section, then view/section, etc.. until a file is either found or the component level is reached.

The defaults are as follows:

  1. component - home

  2. controller - index

  3. view - index

  4. section - body



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# File 'lib/volt/templates/template_binding.rb', line 67

def path_for_template(lookup_path, force_section=nil)
  parts = lookup_path.split('/')
  parts_size = parts.size

  default_parts = ['home', 'index', 'index', 'body']

  # When forcing a sub template, we can default the sub template section
  default_parts[-1] = force_section if force_section
  
  (5 - parts_size).times do |path_position|
    # If they passed in a force_section, we can skip the first
    next if force_section && path_position == 0
    
    full_path = [@collection_name, @controller_name, @page_name, nil]

    offset = 0
    start_at = full_path.size - parts_size - path_position
  
    full_path.size.times do |index|
      if index >= start_at
        if part = parts[index-start_at]
          full_path[index] = part
        else
          full_path[index] = default_parts[index]
        end
      end
    end

    path = full_path.join('/')
    if check_for_template?(path)
      controller = nil
      if path_position > 1
        # Lookup the controller
        controller = [full_path[0], full_path[1]]
      end
      return path, controller
    end
  end
  
  return nil, nil
end

#remove ⇒ Object 



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# File 'lib/volt/templates/template_binding.rb', line 151

def remove
  if @path_changed_listener
    @path_changed_listener.remove
    @path_changed_listener = nil
  end

  if @section_changed_listener
    @section_changed_listener.remove
    @section_changed_listener = nil
  end
  
  if @current_template
    # Remove the template if one has been rendered, when the template binding is
    # removed.
    @current_template.remove
  end

  super
end

#setup_path(binding_in_path) ⇒ Object 



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# File 'lib/volt/templates/template_binding.rb', line 34

def setup_path(binding_in_path)
  path_parts = binding_in_path.split('/')
  @collection_name = path_parts[0]
  @controller_name = path_parts[1]
  @page_name = path_parts[2]
end

#update ⇒ Object 



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# File 'lib/volt/templates/template_binding.rb', line 109

def update
  full_path, controller = path_for_template(@path.cur, @section.cur)

  @current_template.remove if @current_template
  
  current_context = @context
  
  if @model
    # Load in any procs
    @model.each_pair do |key,value|
      if value.class == Proc
        @model[key] = value.call
      end
    end
  end
  
  # TODO: at the moment a :body section and a :title will both initialize different
  # controllers.  Maybe we should have a way to tie them together?
  if controller
    args = []
    args << SubContext.new(@model) if @model
    
    name = controller[1].camelize
    
    # For the home object, we do not need to namespace our controller
    if controller[0] != 'home'
      base_name = controller[0].camelize
      base_object = Object.send(:const_get, base_name.to_sym)
    else
      base_object = Object
    end
    
    # Initialize the new controller
    current_context = base_object.send(:const_get, (name + 'Controller').to_sym).new(*args)
  elsif @model
    # Passed in attributes, but there is no controller
    current_context = SubContext.new(@model, current_context)      
  end

  @current_template = TemplateRenderer.new(@target, current_context, @binding_name, full_path)
end