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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
-- todo: done (or just get rid of done altogether) ... saves no purpose
-- any longer
local attributes, nodes, node = attributes, nodes, node
local enableaction = nodes.tasks.enableaction
local nodecodes = nodes.nodecodes
local listcodes = nodes.listcodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local alignment_code = listcodes.alignment
local cell_code = listcodes.cell
local nuts = nodes.nuts
local nodepool = nuts.pool
local tonode = nuts.tonode
local tonut = nuts.tonut
local getnext = nuts.getnext
local getprev = nuts.getprev
local getid = nuts.getid
local getlist = nuts.getlist
local getattr = nuts.getattr
local getsubtype = nuts.getsubtype
local getwhd = nuts.getwhd
local getwidth = nuts.getwidth
local setattr = nuts.setattr
local setlink = nuts.setlink
local setlist = nuts.setlist
local setattributelist = nuts.setattributelist
local takebox = nuts.takebox
local findtail = nuts.tail
local traverse = nuts.traverse
local traverse_id = nuts.traverse_id
local flush_node_list = nuts.flush_list
local new_rule = nodepool.rule
local new_kern = nodepool.kern
local privateattributes = attributes.private
local linefillers = nodes.linefillers
local a_color = privateattributes("color")
local a_transparency = privateattributes("transparency")
local a_colormodel = privateattributes("colormodel")
local a_background = privateattributes("background")
local a_alignbackground = privateattributes("alignbackground")
local a_linefiller = privateattributes("linefiller")
local a_ruled = privateattributes("ruled")
-- actually we can be more clever now: we can store cells and row data
-- and apply it
local function colored_a(current,list,template,id)
local width, height, depth = getwhd(current)
local total = height + depth
if width > 0 and total > 0 then
local rule = nil
--
local a = getattr(template,a_linefiller)
if a then
local d = linefillers.data[a%1000]
if d then
rule = linefillers.filler(template,d,width,height,depth)
end
end
--
if not rule then
rule = new_rule(width,height,depth)
end
local back = new_kern(-((id == vlist_code and total) or width))
setattributelist(rule,template)
return setlink(rule,back,list)
end
end
local function colored_b(current,list,template,id,indent)
local width, height, depth = getwhd(current)
local total = height + depth
if width > 0 and total > 0 then
local fore = (indent ~= 0) and new_kern(indent)
local rule = nil
--
local a = getattr(template,a_linefiller)
if a then
local d = linefillers.data[a%1000]
if d then
rule = linefillers.filler(template,d,width-indent,height,depth)
end
end
--
if not rule then
rule = new_rule(width-indent,height,depth)
setattributelist(rule,template)
end
local back = new_kern(-((id == vlist_code and total) or width))
return setlink(fore,rule,back,list)
end
end
local function add_backgrounds(head)
for current, id in traverse(head) do
if id == hlist_code or id == vlist_code then
local list = getlist(current)
if list then
local head = add_backgrounds(list)
if head then
setlist(current,head)
list = head
end
end
local background = getattr(current,a_background)
if background then
local list = colored_a(current,list,current,id)
if list then
setlist(current,list)
end
end
end
end
return head, true
end
-- We use a fake hlist with proper attributes.
local templates = { }
local currentrow = 0
local function add_alignbackgrounds(head)
for current in traverse_id(hlist_code,head) do -- what is valign?
if getsubtype(current) == alignment_code then
local list = getlist(current)
if list then
for current in traverse_id(hlist_code,list) do
if getsubtype(current) == cell_code then
local list = getlist(current)
if list then
for template in traverse_id(hlist_code,list) do
local background = getattr(template,a_alignbackground)
if background then
local list = colored_a(current,list,template)
if list then
setlist(current,list)
end
end
break
end
end
end
end
end
currentrow = currentrow + 1
local template = templates[currentrow]
if template then
local list = colored_b(current,list,template[1],hlist_code,template[2])
if list then
setlist(current,list)
end
flush_node_list(template)
templates[currentrow] = false
end
end
end
return head, true
end
function nodes.handlers.backgrounds(head,where)
local head, done = add_backgrounds(tonut(head))
return tonode(head), done
end
function nodes.handlers.alignbackgrounds(head,where)
if where == "alignment" and head then
local head, done = add_alignbackgrounds(tonut(head))
return tonode(head), done
else
return head, false
end
end
-- interfaces.implement {
-- name = "enablebackgroundboxes",
-- onlyonce = true,
-- actions = enableaction,
-- arguments = { "'shipouts'", "'nodes.handlers.backgrounds'" }
-- }
--
-- doing it in the shipout works as well but this is nicer
interfaces.implement {
name = "enablebackgroundboxes",
onlyonce = true,
actions = function()
enableaction("mvlbuilders", "nodes.handlers.backgrounds")
enableaction("vboxbuilders","nodes.handlers.backgrounds")
end,
}
interfaces.implement {
name = "enablebackgroundalign",
onlyonce = true,
actions = function()
enableaction("mvlbuilders", "nodes.handlers.alignbackgrounds")
enableaction("vboxbuilders","nodes.handlers.alignbackgrounds")
end,
}
interfaces.implement {
name = "setbackgroundrowdata",
arguments = { "integer", "integer", "dimension" },
actions = function(row,box,indent)
templates[row] = { takebox(box), indent }
end,
}
interfaces.implement {
name = "resetbackgroundrowdata",
actions = function()
currentrow = 0
end,
}
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