diff --git a/lib/progress-bar.rb b/lib/progress-bar.rb
index 2954633..6fe5a68 100644
--- a/lib/progress-bar.rb
+++ b/lib/progress-bar.rb
@@ -1,13 +1,20 @@
 require 'dbus'
 
 module ProgressBar
-	def self.new *a
-		if STDERR.tty?
-			Console.new *a
-		elsif 'KDE' == ENV['XDG_CURRENT_DESKTOP']
-			KDialog.new *a
-		else
-			KDialog.new *a
+	@klasses ||= []
+	class <<self
+		def register klass
+			if klass.possible?
+				@klasses.push klass
+				true
+			else
+				false
+			end
+		end
+
+		def new *a, **o
+			klass = @klasses.find &:possible?
+			klass.new *a, **o
 		end
 	end
 end
@@ -15,7 +22,7 @@ end
 class ProgressBar::Base
 	attr_reader :max, :i, :text, :error
 	attr_accessor :start
-	def initialize max = nil, text = nil
+	def initialize max = nil, text = nil, **_options
 		@start, @max, @i, @text, @error = Time.now, max || 100, 0, text || '', nil
 		at_exit {finish}
 	end
@@ -54,9 +61,14 @@ class ProgressBar::Base
 	def change_text()  end
 	def change_error()  end
 	def finish()  end
+	def self.possible?()  false  end
 end
 
 class ProgressBar::Console < ProgressBar::Base
+	def self.possible?
+		STDERR.tty?
+	end
+
 	def initialize *a
 		super *a
 		change_text
@@ -89,15 +101,61 @@ class ProgressBar::Console < ProgressBar::Base
 	end
 end
 
-class ProgressBar::KDialog < ProgressBar::Base
-	attr_reader :dialog_service_path, :dialog_object_path, :errors, :dialog_object
-	def initialize max, text = nil, title = nil
+class ProgressBar::KDE < ProgressBar::Base
+	def self.possible?
+		'KDE' == ENV['XDG_CURRENT_DESKTOP']
+	end
+	attr_reader :bus, :service, :view
+
+	def initialize max, text = nil, title = nil, app_name: nil, app_icon_name: nil, unit: nil, is_cancable: nil, is_suspendable: nil, unit: nil, **_options
 		super max, text
 		text = @text
-		text = nil  if text.nil? or text.empty?
+		text = nil   if text.nil?  or text.empty?
+		title = nil  if title.nil? or title.empty?
+		@unit = ''   if unit.nil?  or unit.empty?
+		@errors = []
+		@bus = DBus::SessionBus.instance
+		@service = @bus['org.kde.JobViewServer']
+		jvs = @service['/JobViewServer']['org.kde.JobViewServer']
+		flags = (is_cancable ? 0x1 : 0) | (is_suspendable ? 0x2 : 0)
+		view_path = jvs.requestView app_name || $0, app_icon_name || '', flags
+		@view = @service[view_path]['org.kde.JobViewV2']
+		@view.setTotalAmount max, unit
+	end
+
+	def change_text
+		@view.setInfoMessage text
+	end
+
+	def change_progress
+		@view.setProcessedAmount i, unit
+		@view.setPercentage done_rel
+	end
+
+	def change_error
+		@view.setError error
+	end
+
+	def finish
+		@view.terminate
+	end
+end
+
+class ProgressBar::KDialog < ProgressBar::Base
+	def self.possible?
+		path = Pathname.new `which kdialog`.chomp
+		$?.exitstatus  and  path.executable?
+	end
+
+	attr_reader :dialog_service_path, :dialog_object_path, :errors, :dialog_object
+
+	def initialize max, text = nil, title = nil, **_options
+		super max, text
+		text = @text
+		text = nil   if text.nil? or text.empty?
 		title = nil  if title.nil? or title.empty?
 		@errors = []
-		args = ['kdialog', *(title ? ['--title', title] : []), '--progressbar', text || '.', max.to_s]
+		args = ['kdialog', title ? ['--title', title] : [], '--progressbar', text || '.', max].flatten.compact.map &:to_s
 		@dialog_service_path, @dialog_object_path = IO.popen( args, 'r', &:readlines).join("\n").split ' '
 		@dialog_bus = DBus.session_bus
 		@dialog_service = @dialog_bus[@dialog_service_path]
@@ -148,3 +206,7 @@ class ProgressBar::KDialog < ProgressBar::Base
 		@dialog_object.Get '', 'maximum'
 	end
 end
+
+ProgressBar.register ProgressBar::Console
+ProgressBar.register ProgressBar::KDE
+ProgressBar.register ProgressBar::KDialog