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if not modules then modules = { } end modules ['page-flt'] = {
version = 1.001,
comment = "companion to page-flt.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local setdimen, setbox, setcount, texbox = tex.setdimen, tex.setbox, tex.setcount, tex.box
local insert, remove = table.insert, table.remove
local texwrite, texsprint, ctxcatcodes = tex.write, tex.sprint, tex.ctxcatcodes
local copy_node_list = node.copy_list
local trace_floats = false trackers.register("graphics.floats", function(v) trace_floats = v end) -- name might change
-- we use floatbox, floatwidth, floatheight
-- text page leftpage rightpage (todo: top, bottom, margin, order)
floats = floats or { }
local noffloats, last, default, pushed = 0, nil, "text", { }
local function initialize()
return {
text = { },
page = { },
leftpage = { },
rightpage = { },
}
end
local stacks = initialize()
-- list location
function floats.stacked(which) -- floats.thenofstacked
return #stacks[which or default]
end
function floats.thestacked(which)
return texwrite(#stacks[which or default])
end
function floats.push()
insert(pushed,stacks)
stacks = initialize()
setcount("global","savednoffloats",0)
end
function floats.pop()
local popped = remove(pushed)
if popped then
for which, stack in next, stacks do
for i=1,#stack do
insert(popped[which],stack[i])
end
end
stacks = popped
setcount("global","savednoffloats",#stacks[default])
end
end
local function setdimensions(b)
local w, h, d = 0, 0, 0
if b then
w, h, d = b.width, b.height, b.depth
end
setdimen("global","floatwidth", w)
setdimen("global","floatheight", h+d)
return w, h, d
end
local function get(stack,n)
n = n or #stack
if n > 0 then
local t = stack[n]
if t then
return t, t.box, n
end
end
end
function floats.save(which,data)
which = which or default
local stack = stacks[which]
noffloats = noffloats + 1
local b = texbox.floatbox
local w, h, d = b.width, b.height, b.depth
local t = {
n = noffloats,
data = data or { },
box = copy_node_list(b),
}
texbox.floatbox = nil
insert(stack,t)
setcount("global","savednoffloats",#stacks[default])
if trace_floats then
logs.report("floats","saving %s float %s in slot %s (%i,%i,%i)",which,noffloats,#stack,w,h,d)
else
interfaces.showmessage("floatblocks",2,noffloats)
end
end
function floats.resave(which)
if last then
which = which or default
local stack = stacks[which]
local b = texbox.floatbox
local w, h, d = b.width, b.height, b.depth
last.box = copy_node_list(b)
texbox.floatbox = nil
insert(stack,1,last)
setcount("global","savednoffloats",#stacks[default])
if trace_floats then
logs.report("floats","resaving %s float %s in slot %s (%i,%i,%i)",which,noffloats,#stack,w,h,d)
else
interfaces.showmessage("floatblocks",2,noffloats)
end
else
logs.report("floats","unable to resave float")
end
end
function floats.flush(which,n)
which = which or default
local stack = stacks[which]
local t, b, n = get(stack,n or 1)
if t then
local w, h, d = setdimensions(b)
if trace_floats then
logs.report("floats","flushing %s float %s from slot %s (%i,%i,%i)",which,t.n,n,w,h,d)
else
interfaces.showmessage("floatblocks",3,t.n)
end
texbox.floatbox = b
last = remove(stack,n)
last.box = nil
setcount("global","savednoffloats",#stacks[default])
else
setdimensions()
end
end
function floats.thevar(name,default)
local value = last and last.data[name] or default
if value and value ~= "" then
texsprint(ctxcatcodes,value)
end
end
function floats.consult(which,n)
which = which or default
local stack = stacks[which]
local t, b, n = get(stack,n)
if t then
local w, h, d = setdimensions(b)
if trace_floats then
logs.report("floats","consulting %s float %s in slot %s (%i,%i,%i)",which,t.n,n,w,h,d)
end
return t, b, n
else
if trace_floats then
logs.report("floats","nothing to consult")
end
setdimensions()
end
end
function floats.collect(which,maxwidth,distance)
which = which or default
local stack = stacks[which]
local n, m = #stack, 0
for i=1,n do
local t, b, n = get(stack,i)
if t then
local w, h, d = setdimensions(b)
if w + distance < maxwidth then
m = m + 1
maxwidth = maxwidth - w - distance
else
break
end
else
break
end
end
if m == 0 then
m = 1
end
setcount("global","nofcollectedfloats",m)
end
function commands.doifsavedfloatelse(which)
local stack = stacks[which or default]
commands.doifelse(#stack>0)
end
function floats.thecheckedpagefloat(packed)
local result = ""
if structure.pages.is_odd() then
if #stacks.rightpage > 0 then
result = "rightpage"
elseif #stacks.page > 0 then
result = "page"
elseif #stacks.leftpage > 0 then
if packed then
result = "leftpage"
else
result = "empty"
end
end
else
if #stacks.leftpage > 0 then
result = "leftpage"
elseif #stacks.page > 0 then
result = "page"
elseif #stacks.rightpage > 0 then
if packed then
result = "rightpage"
else
result = "empty"
end
end
end
texsprint(ctxcatcodes,result)
end
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