#
# tk/canvastag.rb - methods for treating canvas tags
#
require 'tk'
require 'tk/canvas'
require 'tk/tagfont'

module TkcTagAccess
  include TkComm
  include TkTreatTagFont

  def addtag(tag)
    @c.addtag(tag, 'with', @id)
    self
  end

  def bbox
    @c.bbox(@id)
  end

  def bind(seq, cmd=Proc.new, args=nil)
    @c.itembind @id, seq, cmd, args
    self
  end

  def bind_append(seq, cmd=Proc.new, args=nil)
    @c.itembind_append @id, seq, cmd, args
    self
  end

  def bind_remove(seq)
    @c.itembind_remove @id, seq
    self
  end

  def bindinfo(seq=nil)
    @c.itembindinfo @id, seq
  end

  def cget(option)
    @c.itemcget @id, option
  end

  def configure(key, value=None)
    @c.itemconfigure @id, key, value
    self
  end
#  def configure(keys)
#    @c.itemconfigure @id, keys
#  end

  def configinfo(key=nil)
    @c.itemconfiginfo @id, key
  end

  def current_configinfo(key=nil)
    @c.current_itemconfiginfo @id, key
  end

  def coords(*args)
    @c.coords @id, *args
  end

  def dchars(first, last=None)
    @c.dchars @id, first, last
    self
  end

  def dtag(tag_to_del=None)
    @c.dtag @id, tag_to_del
    self
  end

  def find
    @c.find 'withtag', @id
  end
  alias list find

  def focus
    @c.itemfocus @id
  end

  def gettags
    @c.gettags @id
  end

  def icursor(index)
    @c.icursor @id, index
    self
  end

  def index(index)
    @c.index @id, index
  end

  def insert(beforethis, string)
    @c.insert @id, beforethis, string
    self
  end

  def lower(belowthis=None)
    @c.lower @id, belowthis
    self
  end

  def move(xamount, yamount)
    @c.move @id, xamount, yamount
    self
  end

  def raise(abovethis=None)
    @c.raise @id, abovethis
    self
  end

  def scale(xorigin, yorigin, xscale, yscale)
    @c.scale @id, xorigin, yorigin, xscale, yscale
    self
  end

  def select_adjust(index)
    @c.select('adjust', @id, index)
    self
  end
  def select_from(index)
    @c.select('from', @id, index)
    self
  end
  def select_to(index)
    @c.select('to', @id, index)
    self
  end

  def itemtype
    @c.itemtype @id
  end

  # Following operators support logical expressions of canvas tags
  # (for Tk8.3+).
  # If tag1.path is 't1' and tag2.path is 't2', then
  #      ltag = tag1 & tag2; ltag.path => "(t1)&&(t2)"
  #      ltag = tag1 | tag2; ltag.path => "(t1)||(t2)"
  #      ltag = tag1 ^ tag2; ltag.path => "(t1)^(t2)"
  #      ltag = - tag1;      ltag.path => "!(t1)"
  def & (tag)
    if tag.kind_of? TkObject
      TkcTagString.new(@c, '(' + @id + ')&&(' + tag.path + ')')
    else
      TkcTagString.new(@c, '(' + @id + ')&&(' + tag.to_s + ')')
    end
  end

  def | (tag)
    if tag.kind_of? TkObject
      TkcTagString.new(@c, '(' + @id + ')||(' + tag.path + ')')
    else
      TkcTagString.new(@c, '(' + @id + ')||(' + tag.to_s + ')')
    end
  end

  def ^ (tag)
    if tag.kind_of? TkObject
      TkcTagString.new(@c, '(' + @id + ')^(' + tag.path + ')')
    else
      TkcTagString.new(@c, '(' + @id + ')^(' + tag.to_s + ')')
    end
  end

  def -@
    TkcTagString.new(@c, '!(' + @id + ')')
  end
end

class TkcTag<TkObject
  include TkcTagAccess

  CTagID_TBL = TkCore::INTERP.create_table
  Tk_CanvasTag_ID = ['ctag'.freeze, '00000'.taint].freeze

  TkCore::INTERP.init_ip_env{ CTagID_TBL.clear }

  def TkcTag.id2obj(canvas, id)
    cpath = canvas.path
    return id unless CTagID_TBL[cpath]
    CTagID_TBL[cpath][id]? CTagID_TBL[cpath][id]: id
  end

  def initialize(parent, mode=nil, *args)
    unless parent.kind_of?(TkCanvas)
      fail ArguemntError, "expect TkCanvas for 1st argument"
    end
    @c = parent
    @cpath = parent.path
    # @path = @id = Tk_CanvasTag_ID.join('')
    @path = @id = Tk_CanvasTag_ID.join(TkCore::INTERP._ip_id_)
    CTagID_TBL[@cpath] = {} unless CTagID_TBL[@cpath]
    CTagID_TBL[@cpath][@id] = self
    Tk_CanvasTag_ID[1].succ!
    if mode
      tk_call_without_enc(@c.path, "addtag", @id, mode, *args)
    end
  end
  def id
    @id
  end

  def exist?
    if @c.find_withtag(@id)
      true
    else
      false
    end
  end

  def delete
    @c.delete @id
    CTagID_TBL[@cpath].delete(@id) if CTagID_TBL[@cpath]
    self
  end
  alias remove  delete
  alias destroy delete

  def set_to_above(target)
    @c.addtag_above(@id, target)
    self
  end
  alias above set_to_above

  def set_to_all
    @c.addtag_all(@id)
    self
  end
  alias all set_to_all

  def set_to_below(target)
    @c.addtag_below(@id, target)
    self
  end
  alias below set_to_below

  def set_to_closest(x, y, halo=None, start=None)
    @c.addtag_closest(@id, x, y, halo, start)
    self
  end
  alias closest set_to_closest

  def set_to_enclosed(x1, y1, x2, y2)
    @c.addtag_enclosed(@id, x1, y1, x2, y2)
    self
  end
  alias enclosed set_to_enclosed

  def set_to_overlapping(x1, y1, x2, y2)
    @c.addtag_overlapping(@id, x1, y1, x2, y2)
    self
  end
  alias overlapping set_to_overlapping

  def set_to_withtag(target)
    @c.addtag_withtag(@id, target)
    self
  end
  alias withtag set_to_withtag
end

class TkcTagString<TkcTag
  def self.new(parent, name, *args)
    if CTagID_TBL[parent.path] && CTagID_TBL[parent.path][name]
      return CTagID_TBL[parent.path][name]
    else
      super(parent, name, *args)
    end
  end

  def initialize(parent, name, mode=nil, *args)
    unless parent.kind_of?(TkCanvas)
      fail ArguemntError, "expect TkCanvas for 1st argument"
    end
    @c = parent
    @cpath = parent.path
    @path = @id = name
    CTagID_TBL[@cpath] = {} unless CTagID_TBL[@cpath]
    CTagID_TBL[@cpath][@id] = self
    if mode
      tk_call_without_enc(@c.path, "addtag", @id, mode, *args)
    end
  end
end
TkcNamedTag = TkcTagString

class TkcTagAll<TkcTag
  def initialize(parent)
    unless parent.kind_of?(TkCanvas)
      fail ArguemntError, "expect TkCanvas for 1st argument"
    end
    @c = parent
    @cpath = parent.path
    @path = @id = 'all'
    CTagID_TBL[@cpath] = {} unless CTagID_TBL[@cpath]
    CTagID_TBL[@cpath][@id] = self
  end
end

class TkcTagCurrent<TkcTag
  def initialize(parent)
    unless parent.kind_of?(TkCanvas)
      fail ArguemntError, "expect TkCanvas for 1st argument"
    end
    @c = parent
    @cpath = parent.path
    @path = @id = 'current'
    CTagID_TBL[@cpath] = {} unless CTagID_TBL[@cpath]
    CTagID_TBL[@cpath][@id] = self
  end
end

class TkcGroup<TkcTag
  Tk_cGroup_ID = ['tkcg'.freeze, '00000'.taint].freeze
  def create_self(parent, *args)
    unless parent.kind_of?(TkCanvas)
      fail ArguemntError, "expect TkCanvas for 1st argument"
    end
    @c = parent
    @cpath = parent.path
    # @path = @id = Tk_cGroup_ID.join('')
    @path = @id = Tk_cGroup_ID.join(TkCore::INTERP._ip_id_)
    CTagID_TBL[@cpath] = {} unless CTagID_TBL[@cpath]
    CTagID_TBL[@cpath][@id] = self
    Tk_cGroup_ID[1].succ!
    add(*args) if args != []
  end
  private :create_self
  
  def include(*tags)
    for i in tags
      i.addtag @id
    end
    self
  end

  def exclude(*tags)
    for i in tags
      i.delete @id
    end
    self
  end
end