reno/libs/context_menu.lua

--   This file is part of Reno desktop.
--
--  Reno desktop is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
--
--  Reno desktop is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License along with Reno desktop. If not, see <https://www.gnu.org/licenses/>. 
-- POLYMENU - brutal deluxe
-- This isn't in the widgets folder because it's too meta to be there
local awful = require("awful")
local wibox = require("wibox")
local awmtk2 = require("awmtk2")

local function position_popup(popup,widget,style)
    -- Position the popup somewhere nearby our original widget
    popup:move_next_to(mouse.current_wibox)
    -- Figure out the geometry of the base widget
    local widget_geo
    for k,v in pairs(mouse.current_widgets or {}) do
        if (widget == v) and mouse.current_widget_geometries then
            widget_geo = mouse.current_widget_geometries[k]
        end
    end
    -- Align y coordinate of the popup to the button
    if widget_geo then
        local wibox_geo = mouse.current_wibox:geometry()
        if popup.current_anchor == "front" then
            popup.y = widget_geo.y + wibox_geo.y - style.popup.margins
        else
            popup.y = widget_geo.y + wibox_geo.y + style.popup.margins + widget_geo.height - popup:geometry().height
        end
    end
    -- Finally, make widget visible
    popup.visible = true
end

return function(args)
    -- A way to communicate that all widgets in menu got closed
    args.on_close = args.on_close or function() end
    local style = awmtk2.create_style("menu",
        awmtk2.generic.menu, args.style)
    local templates = awmtk2.create_template_lib("menu", awmtk2.templates, args.templates)
    local t = awmtk2.build_templates(templates,style)
    local function menu_builder(element,layer,root_layer)
        local new_element = wibox.widget(t.button(t.article({
            icon = element[3],
            resize = true,
            title = element[1]
        }),{
            forced_width = style.button.forced_width,
            forced_height = style.button.forced_height
        }))
        local onpress = function(widget)
            style.button.onrelease(widget)
            widget:emit_signal("cascade::kill")
            if root_layer._private.focused then
                root_layer._private.focused:emit_signal("cascade::kill")
                root_layer:emit_signal("cascade::kill")
            end
        end
        if type(element[2]) == "string" then
            new_element:connect_signal("button::press",style.button.onpress)
            new_element:connect_signal("button::press",function()
                awful.spawn(element[2])
            end)
            new_element:connect_signal("button::release",onpress)
        elseif type(element[2]) == "function" then
            new_element:connect_signal("button::press",style.button.onpress)
            new_element:connect_signal("button::press",element[2])
            new_element:connect_signal("button::release",onpress)
        elseif type(element[2]) == "table" then
            local layout = wibox.widget({
                spacing = style.base.spacing,
                layout = wibox.layout.fixed.vertical
            })
            for _,v in pairs(element[2]) do
                layout:add(menu_builder(v,layout,root_layer))
            end
            local next_layer = awful.popup(t.popup(layout,{
                visible = false,
                ontop = true,
                preferred_positions = {"right","left"},
                preferred_anchors = {"front","back"},
            }))
            local function open_layer(widget)
                if layer._private.focused == widget and
                   next_layer.visible then
                        return
                end
                if layer._private.focused then
                    layer._private.focused:emit_signal("cascade::close")
                end
                layer._private.focused = widget
                position_popup(next_layer, new_element, style)
            end
            local onclose = function()
                style.button.onrelease(new_element)
                if layout._private.focused then
                    layout._private.focused:emit_signal("cascade::close")
                end
                next_layer.visible = false
            end
            new_element:connect_signal("cascade::close",onclose)
            new_element:connect_signal("cascade::kill",onclose)
            root_layer:connect_signal("cascade::kill",onclose)
            root_layer:connect_signal("cascade::close",onclose)
            -- that sweet "just move the mouse 4head" navigation
            if style.base.menu_slide then
                new_element:connect_signal("mouse::enter",open_layer)
                new_element:connect_signal("mouse::enter",style.button.onpress)
            else
                new_element:connect_signal("button::press",style.button.onpress)
                new_element:connect_signal("button::press",open_layer)
            end
        end
        return new_element
    end
    local root_layer = args.parent or wibox.widget {
        layout = wibox.layout.fixed.vertical,
        id = "menu_root",
        spacing = style.base.spacing
    }
    for _,v in pairs(args.items) do
        root_layer:add(menu_builder(v,root_layer,root_layer))
    end
    return root_layer
end