Setting label properties

Cássio Marques committed Apr 14, 2013

commit 40f0292098b1c1cf8a3e5b4d17c5203afd491000

Showing 2 changed files with 106 additions and 14 deletions

zebra/epl/label.rb b/lib/zebra/epl/label.rb +33 -6

@@	@@ -2,29 +2,50 @@
	module Zebra
	module Epl
	class Label
+	class InvalidPrintSpeedError < StandardError; end
+	class InvalidPrintDensityError < StandardError; end
+	class PrintSpeedNotInformedError < StandardError; end
+
	attr_reader :elements
+	attr_accessor :width, :length, :gap, :print_speed, :print_density

-	def initialize
+	def initialize(options = {})
+	options.each_pair { \|key, value\| self.__send__("#{key}=", value) if self.respond_to?("#{key}=") }
	@elements = []
	end

+	def length_and_gap=(length_and_gap)
+	self.length = length_and_gap[0]
+	self.gap = length_and_gap[1]
+	end
+
+	def print_speed=(s)
+	raise InvalidPrintSpeedError unless (0..6).include?(s)
+	@print_speed = s
+	end
+
+	def print_density=(d)
+	raise InvalidPrintDensityError unless (0..15).include?(d)
+	@print_density = d
+	end
+
	def <<(element)
	elements << element
	end

	def dump_contents(io = STDOUT)
+	check_required_configurations
	# Start options
	io << "O\n"
	# Q<label height in dots>,<space between labels in dots>
-	io << "Q240,24\n"
+	io << "Q#{length},#{gap}\n" if length && gap
	# q<label width in dots>
-	io << "q432\n"
+	io << "q#{width}\n" if width
	# Print Speed (S command)
-	io << "S2\n"
+	io << "S#{print_speed}\n"
	# Density (D command)
-	io << "D5\n"
+	io << "D#{print_density}\n" if print_density
	# ZT = Printing from top of image buffer.
-	io << "ZT\n"

	io << "\n"
	# Start new label
@@	@@ -36,6 +57,12 @@ module Zebra

	io << "P0\n"
	end
+
+	private
+
+	def check_required_configurations
+	raise PrintSpeedNotInformedError unless print_speed
+	end
	end
	end
	end

spec/zebra/epl/label_spec.rb +73 -8

@@	@@ -3,7 +3,46 @@
	require 'spec_helper'

	describe Zebra::Epl::Label do
-	subject(:label) { described_class.new }
+	subject(:label) { described_class.new :print_speed => 2 }
+
+	describe "#new" do
+	it "sets the label width" do
+	label = described_class.new :width => 300
+	label.width.should == 300
+	end
+
+	it "sets the label length/gap" do
+	label = described_class.new :length_and_gap => [400, 24]
+	label.length.should == 400
+	label.gap.should == 24
+	end
+
+	it "sets the printing speed" do
+	label = described_class.new :print_speed => 2
+	label.print_speed.should == 2
+	end
+
+	it "validates the printing speed" do
+	[-1, 8, "a"].each do \|s\|
+	expect {
+	described_class.new :print_speed => s
+	}.to raise_error(Zebra::Epl::Label::InvalidPrintSpeedError)
+	end
+	end
+
+	it "sets the print density" do
+	label = described_class.new :print_density => 10
+	label.print_density.should == 10
+	end
+
+	it "validates the print density" do
+	[-1, 16, "a"].each do \|d\|
+	expect {
+	described_class.new :print_density => d
+	}.to raise_error(Zebra::Epl::Label::InvalidPrintDensityError)
+	end
+	end
+	end

	describe "#<<" do
	it "adds an item to the list of label elements" do
@@	@@ -11,16 +50,42 @@ describe Zebra::Epl::Label do
	label << stub
	}.to change { label.elements.count }.by 1
	end
+	end
+
+	describe "#dump_contents" do
+	let(:io) { "" }

-	describe "#dump_contents" do
-	let(:io) { "" }
+	it "dumps its contents to the received IO" do
+	label << stub(:to_s => "foobar")
+	label << stub(:to_s => "blabla")
+	label.width = 100
+	label.length_and_gap = [200, 24]
+	label.print_speed = 3
+	label.print_density = 10
+	label.dump_contents(io)
+	io.should == "O\nQ200,24\nq100\nS3\nD10\n\nN\nfoobar\nblabla\nP0\n"
+	end
+
+	it "does not try to set the label width when it's not informed (falls back to autosense)" do
+	label.dump_contents(io)
+	io.should_not =~ /q/
+	end

-	it "dumps its contents to the received IO" do
-	label << stub(:to_s => "foobar")
-	label << stub(:to_s => "blabla")
+	it "does not try to set the length/gap when they were not informed (falls back to autosense)" do
+	label.dump_contents(io)
+	io.should_not =~ /Q/
+	end
+
+	it "does not try to set the print density when it's not informed (falls back to the default value)" do
+	label.dump_contents(io)
+	io.should_not =~ /D/
+	end
+
+	it "raises an error if the print speed was not informed" do
+	label = described_class.new
+	expect {
	label.dump_contents(io)
-	io.should == "O\nQ240,24\nq432\nS2\nD5\nZT\n\nN\nfoobar\nblabla\nP0\n"
-	end
+	}.to raise_error(Zebra::Epl::Label::PrintSpeedNotInformedError)
	end
	end
	end