reno/libs/pager.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/>. 
local awful = require("awful")
local wibox = require("wibox")

return function(widget,list,max_elements)
    if not tostring(widget):match("wibox.layout") then
        error("Cannot attach pager to widget that isn't a layout")
    end
    local new_pager = {
        page = widget,
        list = list,
        index = 0,
        max = max_elements
    }
    function new_pager:update()
        self.page:reset()
        for i = 1+(self.max*self.index),self.max+(self.max*self.index) do
            if self.list[i] then
                self.page:add(self.list[i])
            end
        end
    end
    function new_pager:next()
        if #list > (self.index+1)*self.max then
            self.index = self.index + 1
            new_pager:update()
        end
    end
    function new_pager:prev()
        if self.index > 0 then
            self.index = self.index - 1
            new_pager:update()
        end
    end
    new_pager:update()
    return new_pager
end