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local lgi = require("lgi")
local Astal = lgi.require("Astal", "3.0")
local Gtk = lgi.require("Gtk", "3.0")
local GObject = lgi.require("GObject", "2.0")
local Binding = require("astal.binding")
local Variable = require("astal.variable")
local exec_async = require("astal.process").exec_async
local function filter(tbl, fn)
local copy = {}
for key, value in pairs(tbl) do
if fn(value, key) then
if type(key) == "number" then
table.insert(copy, value)
else
copy[key] = value
end
end
end
return copy
end
local function map(tbl, fn)
local copy = {}
for key, value in pairs(tbl) do
copy[key] = fn(value)
end
return copy
end
local function flatten(tbl)
local copy = {}
for _, value in pairs(tbl) do
if type(value) == "table" and getmetatable(value) == nil then
for _, inner in pairs(flatten(value)) do
table.insert(copy, inner)
end
else
table.insert(copy, value)
end
end
return copy
end
local function includes(tbl, elem)
for _, value in pairs(tbl) do
if value == elem then
return true
end
end
return false
end
local function set_children(parent, children)
children = map(
filter(flatten(children), function(item)
return not not item
end),
function(item)
if Gtk.Widget:is_type_of(item) then
return item
end
return Gtk.Label({
visible = true,
label = tostring(item),
})
end
)
-- remove
if Gtk.Bin:is_type_of(parent) then
local ch = parent:get_child()
if ch ~= nil then
parent:remove(ch)
end
if ch ~= nil and not includes(children, ch) and not parent.no_implicit_destroy then
ch:destroy()
end
elseif Gtk.Container:is_type_of(parent) then
for _, ch in ipairs(parent:get_children()) do
parent:remove(ch)
if ch ~= nil and not includes(children, ch) and not parent.no_implicit_destroy then
ch:destroy()
end
end
end
-- TODO: add more container types
if Astal.Box:is_type_of(parent) then
parent:set_children(children)
elseif Astal.Stack:is_type_of(parent) then
parent:set_children(children)
elseif Astal.CenterBox:is_type_of(parent) then
parent.start_widget = children[1]
parent.center_widget = children[2]
parent.end_widget = children[3]
elseif Astal.Overlay:is_type_of(parent) then
parent:set_child(children[1])
children[1] = nil
parent:set_overlays(children)
elseif Gtk.Container:is_type_of(parent) then
for _, child in pairs(children) do
if Gtk.Widget:is_type_of(child) then
parent:add(child)
end
end
end
end
local function merge_bindings(array)
local function get_values(...)
local args = { ... }
local i = 0
return map(array, function(value)
if getmetatable(value) == Binding then
i = i + 1
return args[i]
else
return value
end
end)
end
local bindings = filter(array, function(v)
return getmetatable(v) == Binding
end)
if #bindings == 0 then
return array
end
if #bindings == 1 then
return bindings[1]:as(get_values)
end
return Variable.derive(bindings, get_values)()
end
return function(ctor)
function ctor:hook(object, signalOrCallback, callback)
if GObject.Object:is_type_of(object) and type(signalOrCallback) == "string" then
local id
if string.sub(signalOrCallback, 1, 8) == "notify::" then
local prop = string.gsub(signalOrCallback, "notify::", "")
id = object.on_notify:connect(function()
callback(self, object[prop])
end, prop, false)
else
id = object["on_" .. signalOrCallback]:connect(function(_, ...)
callback(self, ...)
end)
end
self.on_destroy = function()
GObject.signal_handler_disconnect(object, id)
end
elseif type(object.subscribe) == "function" then
local unsub = object.subscribe(function(...)
signalOrCallback(self, ...)
end)
self.on_destroy = unsub
else
error("can not hook: not gobject+signal or subscribable")
end
end
function ctor:toggle_class_name(name, on)
Astal.widget_toggle_class_name(self, name, on)
end
return function(tbl)
tbl = tbl or {}
local bindings = {}
local setup = tbl.setup
-- collect children
local children = merge_bindings(flatten(filter(tbl, function(_, key)
return type(key) == "number"
end)))
-- default visible to true
if tbl.visible == nil then
tbl.visible = true
end
-- collect props
local props = filter(tbl, function(_, key)
return type(key) == "string" and key ~= "setup"
end)
-- collect signal handlers
for prop, value in pairs(props) do
if string.sub(prop, 0, 2) == "on" and type(value) ~= "function" then
props[prop] = function()
exec_async(value, print)
end
end
end
-- collect bindings
for prop, value in pairs(props) do
if getmetatable(value) == Binding then
bindings[prop] = value
props[prop] = value:get()
end
end
-- construct, attach bindings, add children
local widget = ctor()
if getmetatable(children) == Binding then
set_children(widget, children:get())
widget.on_destroy = children:subscribe(function(v)
set_children(widget, v)
end)
else
if #children > 0 then
set_children(widget, children)
end
end
for prop, binding in pairs(bindings) do
widget.on_destroy = binding:subscribe(function(v)
widget[prop] = v
end)
end
for prop, value in pairs(props) do
widget[prop] = value
end
if type(setup) == "function" then
setup(widget)
end
return widget
end
end
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