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/usr/lib/ruby/2.3.0/CDApplet.rb is in cairo-dock-plug-ins-dbus-interface-ruby 3.4.1-0ubuntu7.

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#!/usr/bin/ruby

# This is a part of the external Ruby Interface for Cairo-Dock

# Author: Fabounet and Eduardo Mucelli Rezende Oliveira
# E-mail: fabounet@glx-dock.org, edumucelli@gmail.com or eduardom@dcc.ufmg.br
#
# This program 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.

# This program 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.

# This applet monitors the battery through acpi module. It is possbile to show a dialog message
#    containing the baterry status, charge, and temperature by left-clicking on the icon.
#    Also, through the configuration panel it is possible to set the icon's label, 
#	 show the % of carge as quick info, and activate an alert message to be shown when the charge is critically low.

require 'rubygems'
gem 'ruby-dbus'
require 'dbus'
require 'parseconfig'

class CDApplet
	attr_accessor :cConfFile, :cAppletName, :icon, :sub_icons, :config, :bus, :_cMenuIconId, :cParentAppName, :cBusPath, :cRootDataDir, :cShareDataDir
	
	BOTTOM = 0
	TOP    = 1
	RIGHT  = 2
	LEFT   = 3
	
	DOCK    = 0
	DESKLET = 1
	
	EMBLEM_TOP_LEFT     = 0
	EMBLEM_BOTTOM_RIGHT = 1
	EMBLEM_BOTTOM_LEFT  = 2
	EMBLEM_TOP_RIGHT    = 3
	EMBLEM_MIDDLE       = 4
	EMBLEM_BOTTOM       = 5
	EMBLEM_TOP          = 6
	EMBLEM_RIGHT        = 7
	EMBLEM_LEFT         = 8
	EMBLEM_PERSISTENT   = 0
	EMBLEM_PRINT        = 9
	
	MENU_ENTRY        = 0
	MENU_SUB_MENU     = 1
	MENU_SEPARATOR    = 2
	MENU_CHECKBOX     = 3
	MENU_RADIO_BUTTON = 4

	MAIN_MENU_ID = 0
	
	DIALOG_KEY_ENTER = -1
	DIALOG_KEY_ESCAPE = -2

	def initialize
		self.config = {}
		self.bus = nil
		self.icon = nil
		self.sub_icons = nil
		self._cMenuIconId = nil
		self.cAppletName = $0[2,999]
		self.cBusPath = ARGV[1]
		self.cConfFile = ARGV[2]
		self.cRootDataDir = ARGV[3]
		self.cParentAppName = ARGV[4]
		self.cShareDataDir = Dir.getwd
		
		self._get_config()
		self._connect_to_dock()
	end
	
	def run
		self.start()
		loop = DBus::Main.new
		loop << self.bus
		loop.run
		puts ">>> applet '#{self.cAppletName}' terminated."
		exit
	end
	
	##################################
	### callbacks on the main icon ###
	##################################
	
	def on_click iState
		### action on click
	end
	
	def on_middle_click
		puts ">>> on_middle_click"
		### action on middle-click
	end
	
	def _on_build_menu
		self._cMenuIconId = nil
		self.on_build_menu()
	end
	
	def on_build_menu
		### build our menu
	end
	
	def _on_menu_select(iNumEntry)
		if self._cMenuIconId == nil
			self.on_menu_select(iNumEntry)
		else
			self.on_menu_select_sub_icon(iNumEntry, self._cMenuIconId)
		end
	end
	
	def on_menu_select(iNumEntry)
		### action on selecting an entry of our menu """
	end
	
	def on_scroll(bScrollUp)
		### action on scroll
	end

	def on_drop_data(cReceivedData)
		### action on dropping something on our applet
	end
	
	def on_answer(answer)
		### action on answering a dialog
	end

	def on_answer_dialog(button, answer)
		### action on answering a dialog
	end

	def on_shortkey(cKey)
		### action on pressing one of the shortkeys we bound beforehand
	end
	
	def on_change_focus(bIsActive)
		### action when the window controlled by the applet takes or looses the focus
	end
	
	##################################
	### callbacks on the sub-icons ###
	##################################
	def on_click_sub_icon(iState, cIconID)
		### action on click on one of our sub-icons
	end
	
	def on_middle_click_sub_icon(cIconID)
		### action on middle-click on one of our sub-icons
	end
	
	def on_scroll_sub_icon(bScrollUp, cIconID)
		### action on scroll on one of our sub-icons
	end
	
	def _on_build_menu_sub_icon(cIconID)
		self._cMenuIconId = cIconID
		self.on_build_menu_sub_icon(cIconID)
	end
	
	def on_build_menu_sub_icon(cIconID)
		### action on build menu on one of our sub-icons
	end
	
	def on_drop_data_sub_icon(cReceivedData, cIconID)
		### action on drop data on one of our sub-icons
	end
	
	def on_menu_select_sub_icon(iNumEntry, cIconID)
		### action on select entry in the menu on one of our sub-icons
	end
	
	
	###############################
	### callbacks on the applet ###
	###############################
	
	def start
		### action when the applet is started
	end
	
	def stop
		### action when the applet is terminated
	end
	
	def _on_stop
		self.stop()
		exit
	end
	
	def reload
		### called when our applet is reloaded (config parameters have changed)
	end
	
	def _on_reload bConfigHasChanged
		if bConfigHasChanged
			self._get_config()
			self.reload()
		end
	end
	
	def _get_config
		keyfile = ParseConfig.new(self.cConfFile)
		self.get_config(keyfile)
	end
	
	def get_config keyfile
		### get our parameters from the key-file
	end
	
	def _connect_to_dock
		# get the icon object on the bus
		self.bus = DBus::SessionBus.instance
		#~ applet_path = "/org/cairodock/CairoDock/#{self.cAppletName}" # path where our object is stored on the bus
		applet_service = bus.service("org.cairodock.CairoDock")
		begin
			applet_object = applet_service.object(self.cBusPath)
			applet_object.introspect
			applet_object.default_iface = 'org.cairodock.CairoDock.applet'
		rescue
			puts ">>> object '#{self.cAppletName}' can't be found on the bus, exit.\nMake sure that the 'Dbus' plug-in is activated in Cairo-Dock"
			exit
		end
		self.icon = applet_object
		
		# get the sub-icons object on the bus
		applet_sub_icons_object = applet_service.object("#{self.cBusPath}/sub_icons")
		applet_sub_icons_object.introspect
		applet_sub_icons_object.default_iface = 'org.cairodock.CairoDock.subapplet'
		self.sub_icons = applet_sub_icons_object
		
		# now connect to the signals
		self.icon.on_signal("on_click") do |iState|
			self.on_click iState
		end
		self.icon.on_signal("on_middle_click") do
			self.on_middle_click
		end
		self.icon.on_signal("on_build_menu") do
			self._on_build_menu
		end
		self.icon.on_signal("on_menu_select") do |iNumEntry|
			self._on_menu_select iNumEntry
		end
		self.icon.on_signal("on_scroll") do |bScrollUp|
			self.on_scroll bScrollUp
		end
		self.icon.on_signal("on_drop_data") do |cReceivedData|
			self.on_drop_data cReceivedData
		end
		self.icon.on_signal("on_answer") do |answer|
			self.on_answer answer
		end
		self.icon.on_signal("on_answer_dialog") do |button, answer|
			self.on_answer_dialog button, answer
		end
		self.icon.on_signal("on_shortkey") do |cKey|
			self.on_shortkey cKey
		end
		self.icon.on_signal("on_change_focus") do |bIsActive|
			self.on_change_focus bIsActive
		end
		
		self.icon.on_signal("on_stop_module") do
			self._on_stop
		end
		
		self.icon.on_signal("on_reload_module") do |bConfigHasChanged|
			self._on_reload bConfigHasChanged
		end
		
		self.sub_icons.on_signal("on_click_sub_icon") do |iState, sub_icon_id|
			self.on_click_sub_icon iState, sub_icon_id
		end
		
		self.sub_icons.on_signal("on_middle_click_sub_icon") do |sub_icon_id|
			self.on_middle_click_sub_icon sub_icon_id
		end
		
		self.sub_icons.on_signal("on_scroll_sub_icon") do |bScrollUp, sub_icon_id|
			self.on_scroll_sub_icon bScrollUp, sub_icon_id
		end
		
		self.sub_icons.on_signal("on_build_menu_sub_icon") do |sub_icon_id|
			self._on_build_menu_sub_icon sub_icon_id
		end
		
		self.sub_icons.on_signal("on_drop_data_sub_icon") do |cReceivedData, sub_icon_id|
			self.on_drop_data_sub_icon cReceivedData, sub_icon_id
		end
		
	end
end