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# node.coffee

lib/psd/

¶

    _        = require 'lodash'
    {Module} = require 'coffeescript-module'

    module.exports = class Node extends Module
      @includes require('./nodes/ancestry.coffee')
      @includes require('./nodes/search.coffee')
      @includes require('./nodes/build_preview.coffee')

      @PROPERTIES: ['name', 'left', 'right', 'top', 'bottom', 'height', 'width']

      type: 'node'

      constructor: (@layer, @parent = null) ->
        @layer.node = @
        @_children = []

        @name = @layer.name

        @forceVisible = null

        @coords =
          top: @layer.top
          bottom: @layer.bottom
          left: @layer.left
          right: @layer.right

        @topOffset = 0
        @leftOffset = 0

        @createProperties()

      createProperties: ->
        Object.defineProperty @, 'top',
          get: -> @coords.top + @topOffset
          set: (val) -> @coords.top = val

        Object.defineProperty @, 'right',
          get: -> @coords.right + @leftOffset
          set: (val) -> @coords.right = val

        Object.defineProperty @, 'bottom',
          get: -> @coords.bottom + @topOffset
          set: (val) -> @coords.bottom = val

        Object.defineProperty @, 'left',
          get: -> @coords.left + @leftOffset
          set: (val) -> @coords.left = val

        Object.defineProperty @, 'width',  get: -> @right - @left
        Object.defineProperty @, 'height', get: -> @bottom - @top

      get: (prop) ->
        value = if @[prop]? then @[prop] else @layer[prop]
        if typeof value is 'function' then value() else value

      visible: ->
        return false if @layer.clipped and not @clippingMask().visible()
        if @forceVisible? then @forceVisible else @layer.visible

      hidden: -> not @visible()

      isLayer: -> @type is 'layer'
      isGroup: -> @type is 'group'
      isRoot: ->  @type is 'root'

      clippingMask: ->
        return null unless @layer.clipped
        @clippingMaskCached or= (
          maskNode = @nextSibling()
          maskNode = maskNode.nextSibling() while maskNode.clipped
          maskNode
        )

      clippedBy: -> @clippingMask()

      export: ->
        hash =
          type: null
          visible: @visible()
          opacity: @layer.opacity / 255.0
          blendingMode: @layer.blendingMode()

        hash[prop] = @[prop] for prop in Node.PROPERTIES
        hash

      updateDimensions: ->
        return if @isLayer()

        child.updateDimensions() for child in @_children

        return if @isRoot()

        nonEmptyChildren = @_children.filter((c) -> not c.isEmpty())
        @left = _.min(nonEmptyChildren.map((c) -> c.left)) or 0
        @top = _.min(nonEmptyChildren.map((c) -> c.top)) or 0
        @bottom = _.max(nonEmptyChildren.map((c) -> c.bottom)) or 0
        @right = _.max(nonEmptyChildren.map((c) -> c.right)) or 0

generated Tue May 12 2015 10:08:58 GMT-0400 (EDT)