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--[[
Copyright (c) 2012 Matthias Richter
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
Except as contained in this notice, the name(s) of the above copyright holders
shall not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
]]--
local stack = {n = 0}
local default = {
pos = {0,0},
grow = {0,0},
spacing = 2,
size = {100, 30},
upper_left = {0,0},
lower_right = {0,0},
}
local current = default
local Grow = {
none = { 0, 0},
up = { 0, -1},
down = { 0, 1},
left = {-1, 0},
right = { 1, 0}
}
-- {grow = grow, spacing = spacing, size = size, pos = pos}
local function push(info)
local grow = info.grow or "none"
local spacing = info.spacing or default.spacing
local size = {
info.size and info.size[1] or current.size[1],
info.size and info.size[2] or current.size[2]
}
local pos = {current.pos[1], current.pos[2]}
if info.pos then
pos[1] = pos[1] + (info.pos[1] or 0)
pos[2] = pos[2] + (info.pos[2] or 0)
end
assert(size, "Size neither specified nor derivable from parent group.")
assert(pos, "Position neither specified nor derivable from parent group.")
grow = assert(Grow[grow], "Invalid grow: " .. tostring(grow))
current = {
pos = pos,
grow = grow,
size = size,
spacing = spacing,
upper_left = { math.huge, math.huge},
lower_right = {-math.huge, -math.huge},
}
stack.n = stack.n + 1
stack[stack.n] = current
end
local function advance(pos, size)
current.upper_left[1] = math.min(current.upper_left[1], pos[1])
current.upper_left[2] = math.min(current.upper_left[2], pos[2])
current.lower_right[1] = math.max(current.lower_right[1], pos[1] + size[1])
current.lower_right[2] = math.max(current.lower_right[2], pos[2] + size[2])
if current.grow[1] ~= 0 then
current.pos[1] = pos[1] + current.grow[1] * (size[1] + current.spacing)
end
if current.grow[2] ~= 0 then
current.pos[2] = pos[2] + current.grow[2] * (size[2] + current.spacing)
end
return pos, size
end
local function getRect(pos, size)
pos = {pos and pos[1] or 0, pos and pos[2] or 0}
size = {size and size[1] or current.size[1], size and size[2] or current.size[2]}
-- growing left/up: update current position to account for differnt size
if current.grow[1] < 0 and current.size[1] ~= size[1] then
current.pos[1] = current.pos[1] + (current.size[1] - size[1])
end
if current.grow[2] < 0 and current.size[2] ~= size[2] then
current.pos[2] = current.pos[2] - (current.size[2] - size[2])
end
pos[1] = pos[1] + current.pos[1]
pos[2] = pos[2] + current.pos[2]
return advance(pos, size)
end
local function pop()
assert(stack.n > 0, "Group stack is empty.")
stack.n = stack.n - 1
local child = current
current = stack[stack.n] or default
local size = {
child.lower_right[1] - math.max(child.upper_left[1], current.pos[1]),
child.lower_right[2] - math.max(child.upper_left[2], current.pos[2])
}
advance(current.pos, size)
end
local function beginFrame()
current = default
stack.n = 0
end
local function endFrame()
-- future use?
end
return setmetatable({
push = push,
pop = pop,
getRect = getRect,
advance = advance,
beginFrame = beginFrame,
endFrame = endFrame,
default = default,
}, {
__index = function(_,k)
return ({size = current.size, pos = current.pos})[k]
end,
__call = function(_, info)
assert(type(info) == 'table' and type(info[1]) == 'function')
push(info)
info[1]()
pop()
end,
})
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