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if not modules then modules = { } end modules ['node-bck'] = {
version = 1.001,
comment = "companion to node-bck.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- beware, this one takes quite some runtime, so we need a status flag
-- maybe some page related state
local attributes, nodes, node = attributes, nodes, node
local tasks = nodes.tasks
local nodecodes = nodes.nodecodes
local listcodes = nodes.listcodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local glyph_code = nodecodes.glyph
local cell_code = listcodes.cell
local nuts = nodes.nuts
local nodepool = nuts.pool
local tonode = nuts.tonode
local tonut = nuts.tonut
local getfield = nuts.getfield
local setfield = nuts.setfield
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getlist = nuts.getlist
local getattr = nuts.getattr
local setattr = nuts.setattr
local getsubtype = nuts.getsubtype
local traverse = nuts.traverse
local traverse_id = nuts.traverse_id
local new_rule = nodepool.rule
local new_glue = nodepool.glue
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local a_colorspace = attributes.private('colormodel')
local a_background = attributes.private('background')
local a_alignbackground = attributes.private('alignbackground')
local function add_backgrounds(head) -- rather old code .. to be redone
local current = head
while current do
local id = getid(current)
if id == hlist_code or id == vlist_code then
local list = getlist(current)
if list then
local head = add_backgrounds(list)
if head then
setfield(current,"list",head)
list = head
end
end
local width = getfield(current,"width")
if width > 0 then
local background = getattr(current,a_background)
if background then
-- direct to hbox
-- colorspace is already set so we can omit that and stick to color
local mode = getattr(current,a_colorspace)
if mode then
local height = getfield(current,"height")
local depth = getfield(current,"depth")
local skip = id == hlist_code and width or (height + depth)
local glue = new_glue(-skip)
local rule = new_rule(width,height,depth)
local color = getattr(current,a_color)
local transparency = getattr(current,a_transparency)
setattr(rule,a_colorspace,mode)
if color then
setattr(rule,a_color,color)
end
if transparency then
setattr(rule,a_transparency,transparency)
end
setfield(rule,"next",glue)
setfield(glue,"prev",rule)
if list then
setfield(glue,"next",list)
setfield(list,"prev",glue)
end
setfield(current,"list",rule)
end
end
end
end
current = getnext(current)
end
return head, true
end
local function add_alignbackgrounds(head)
local current = head
while current do
local id = getid(current)
if id == hlist_code then
local list = getlist(current)
if not list then
-- no need to look
elseif getsubtype(current) == cell_code then
local background = nil
local found = nil
-- for l in traverse(list) do
-- background = getattr(l,a_alignbackground)
-- if background then
-- found = l
-- break
-- end
-- end
-- we know that it's a fake hlist (could be user node)
-- but we cannot store tables in user nodes yet
for l in traverse_id(hpack_code,list) do
background = getattr(l,a_alignbackground)
if background then
found = l
end
break
end
--
if background then
-- current has subtype 5 (cell)
local width = getfield(current,"width")
if width > 0 then
local mode = getattr(found,a_colorspace)
if mode then
local glue = new_glue(-width)
local rule = new_rule(width,getfield(current,"height"),getfield(current,"depth"))
local color = getattr(found,a_color)
local transparency = getattr(found,a_transparency)
setattr(rule,a_colorspace,mode)
if color then
setattr(rule,a_color,color)
end
if transparency then
setattr(rule,a_transparency,transparency)
end
setfield(rule,"next",glue)
setfield(glue,"prev",rule)
if list then
setfield(glue,"next",list)
setfield(list,"prev",glue)
end
setfield(current,"list",rule)
end
end
end
else
add_alignbackgrounds(list)
end
elseif id == vlist_code then
local list = getlist(current)
if list then
add_alignbackgrounds(list)
end
end
current = getnext(current)
end
return head, true
end
-- nodes.handlers.backgrounds = add_backgrounds
-- nodes.handlers.alignbackgrounds = add_alignbackgrounds
nodes.handlers.backgrounds = function(head) local head, done = add_backgrounds (tonut(head)) return tonode(head), done end
nodes.handlers.alignbackgrounds = function(head) local head, done = add_alignbackgrounds(tonut(head)) return tonode(head), done end
-- elsewhere: needs checking
-- tasks.appendaction("shipouts","normalizers","nodes.handlers.backgrounds")
-- tasks.appendaction("shipouts","normalizers","nodes.handlers.alignbackgrounds")
interfaces.implement {
name = "enablebackgroundboxes",
onlyonce = true,
actions = nodes.tasks.enableaction,
arguments = { "'shipouts'", "'nodes.handlers.backgrounds'" }
}
interfaces.implement {
name = "enablebackgroundalign",
onlyonce = true,
actions = nodes.tasks.enableaction,
arguments = { "'shipouts'", "'nodes.handlers.alignbackgrounds'" }
}
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