c# barcode generator wpf Plugin Directory Structure File/Directory in Font

Drawer QR in Font Plugin Directory Structure File/Directory

Table 10-2. Plugin Directory Structure File/Directory
QR-Code Encoder In None
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Barcode Encoder In None
Using Barcode drawer for Font Control to generate, create Barcode image in Font applications.
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lib tasks test
Generating Code128 In None
Using Barcode printer for Font Control to generate, create Code 128A image in Font applications.
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Drawing USS Code 39 In None
Using Barcode maker for Font Control to generate, create Code 3/9 image in Font applications.
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Description
Draw Data Matrix 2d Barcode In None
Using Barcode drawer for Font Control to generate, create DataMatrix image in Font applications.
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Barcode Maker In None
Using Barcode encoder for Font Control to generate, create Barcode image in Font applications.
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Directory where the plugin code will be located. By convention, a Ruby file named after the plugin is created here. Directory where Rake tasks specific to this plugin can be created. Directory where you can add tests for this plugin.
QR Code 2d Barcode Printer In None
Using Barcode creation for Font Control to generate, create QR Code ISO/IEC18004 image in Font applications.
www.OnBarcode.com
Generate USPS Intelligent Mail In None
Using Barcode drawer for Font Control to generate, create USPS OneCode Solution Barcode image in Font applications.
www.OnBarcode.com
Continued
Painting QR Code In Java
Using Barcode generator for Android Control to generate, create QR Code JIS X 0510 image in Android applications.
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Generate QR In None
Using Barcode creator for Software Control to generate, create QR image in Software applications.
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CHAPTER 10 EXTENDING RAILS WITH PLUGINS
EAN / UCC - 14 Generator In Visual Basic .NET
Using Barcode generation for .NET framework Control to generate, create EAN128 image in .NET applications.
www.OnBarcode.com
Barcode Creator In Java
Using Barcode generator for Eclipse BIRT Control to generate, create Barcode image in Eclipse BIRT applications.
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Table 10-2. Continued File/Folder
Code 39 Full ASCII Creation In None
Using Barcode generator for Microsoft Excel Control to generate, create Code 3/9 image in Office Excel applications.
www.OnBarcode.com
Barcode Printer In Java
Using Barcode printer for Java Control to generate, create Barcode image in Java applications.
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README MIT-LICENSE
Create Barcode In .NET Framework
Using Barcode creation for .NET Control to generate, create Barcode image in .NET framework applications.
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Recognize Barcode In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
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Description
Barcode Creation In None
Using Barcode generator for Office Word Control to generate, create Barcode image in Office Word applications.
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Barcode Reader In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
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File that contains a description of the plugin and instructions for using it. It s good practice to specify the license under which this plugin is released. Rails assumes the MIT license will be used. Feel free to use whatever license best suits your application. Code in this file is executed when the plugin is installed. Similar to install.rb, this file contains code that will be executed when the plugin is uninstalled. A Rake file with tasks to run the tests for this plugin and generated Ruby documentation. Initialization code that Rails will execute automatically to make this plugin available to your application.
Barcode Encoder In None
Using Barcode generation for Software Control to generate, create Barcode image in Software applications.
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Barcode Scanner In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
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install.rb uninstall.rb Rakefile init.rb
As you saw when we used the acts_as_taggable plugin in the previous section, a plugin usually adds one or more methods in the class, or object, in which it is acting. We ll take a similar path we ll add a search method, also known as an action, to the events controller, to make the search functionality external to our application.
Making the Plugin Available to Applications
First, we need to let Rails know what source files it should use. We also need to make the simply_searchable method available to any controller that wants to use it, in the same fashion that the acts_as_taggable method was made available to our Event model. We accomplish both tasks by modifying the init.rb file, as shown in Listing 10-5.
Listing 10-5. Updates to vendor/plugins/simply_searchable/init.rb
require 'simply_searchable' ActionController::Base.send(:include, BeginningRails::SimplySearchable)
The require 'simply_searchable' line directs Rails to our plugin files. By calling ActionController::Base.send(:include, BeginningRails::SimplySearchable), we are including the methods in the SimplySearchable module into the ActionController::Base class, which is the class from which all our controllers inherit. Next, we ll create that module and add the plugin methods.
CHAPTER 10 EXTENDING RAILS WITH PLUGINS
Creating the Plugin Module
Now it s time to dive into the plugin code. We ll create a module named SimplySearchable that will contain our plugin s methods. We ll build up this module in pieces, and then present the entire module in Listing 10-6 at the end of this section. We start with the following:
module BeginningRails module SimplySearchable end end
In order to prevent namespace clashes, it s always a good idea to give your plugins a unique namespace by wrapping them in a uniquely named module. It s possible that someone else might create a plugin called SimplySearchable one day, which would create problems if we had them both installed at the same time. Wrapping our SimplySearchable module inside the BeginningRails module will help us avoid this (admittedly unlikely) situation. The first piece of code we need to add inside the SimplySearchable module is the included hook. Just like Active Record s callbacks, which allow you to hook into specific events in the object life cycle (create, destroy, and so on), Ruby modules have hooks that allow you to respond to events that occur in your modules and classes. The included hook is triggered whenever your module is included (or mixed in) to a class. You can t create class methods through inclusion, because self inside a module is the module itself, not the class in which it might be eventually included. This is easier to illustrate with code, so here s an example:
module Greetable # An instance method def say_hello puts "hello" end # A class method def self.say_cheers puts "cheers" end end # A class that mixes-in Greetable class Bar include Greetable end
CHAPTER 10 EXTENDING RAILS WITH PLUGINS
# The instance method, say_hello, will be available to the Bar class b = Bar.new b.say_hello # => hello # The class method, say_cheers, doesn't exist on Bar Bar.say_cheers # => NoMethodError: undefined method `say_cheers' for #<Bar:0x346bb0> # Since self is the Greetable module, say_cheers exists on it Greetable.say_cheers # => cheers
When you need a mixed-in module to define class methods, you use the extend hook. Here s how we would rewrite the Greetable module to correctly create the say_cheers class method on classes that include it.
module Greetable # The included hook is triggered whenever this module # is included in another class def self.included(base) # base is the receiving class (the class in which # this module is included). The extend method works # like include: it accepts a module and extends the # receiving class with the methods defined in it base.extend ClassMethods end # An instance method def say_hello puts "hello" end # A module to contain class methods that will extend # the receiving class module ClassMethods # A class method def say_cheers puts "cheers" end end end # A class that mixes in Greetable class Bar include Greetable end
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