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As a dynamic, object-oriented programming language, Ruby wasn t designed to be a highperformance language in the traditional sense. This is not of particular concern nowadays, as most tasks are not computationally intensive, but there are still situations where raw performance is required for a subset of functionality. In situations where extremely high performance is desirable, it can be a good idea to write the computationally intensive code in a more powerful but less expressive language, and then call that code from Ruby. Luckily there s a library for Ruby called RubyInline, created by Ryan Davis and Eric Hodel, that makes it possible to write code in other more powerful languages within your Ruby code. It s most often used to write high-performance code in the C or C++ languages, and we ll focus on this in this section. Installing RubyInline on Unix-related platforms (such as Linux and OS X) is easy with RubyGems: gem install RubyInline If you don t have gcc a C compiler installed, RubyInline s C support will not work, and RubyInline itself might not install. Refer to your operating system s documentation on how to install gcc.

contents:

Note At the time of writing, RubyInline has been reported as working on Microsoft Windows, with some

Figure 2-10. Turning behaviors on or off Turning the column indicator on demarcates columns higher than column 80 with a grayed background, enabling you to see when a line exceeds 80 characters. This can be useful in some coding or data contexts, and is illustrated in Figure 2-11. Link Navigation, turned on by default, supports the use of hyperlinks in modes supporting this functionality. However, enabling this feature to work requires adding some configuration data that defines a NavigationSource and other settings, which is beyond the scope of this book.

significant adjustments needed (although it runs perfectly under the Cygwin environment). However, these are only to be attempted by advanced users, although they might be incorporated in the library automatically by the time of publishing. If you re a Windows user who wishes to use RubyInline, either investigate Cygwin or check the official web site at http://www.zenspider.com/ZSS/Products/RubyInline/.

C is a general purpose, procedural, compiled programming language developed in the 1970s by Dennis Ritchie. It s one of the most widely used programming languages in the world, and

<UserControl x:Class="CoolDownButton.themes.generic" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White"> </Grid> </UserControl> 7. You need to change the generic.xaml file to be a resource dictionary. To do this, replace the UserControl tag with a ResourceDictionary tag. Then remove the Width and Height definitions and add a new xmlns for the CoolDownButton. Finally, remove the Grid definition. Your code should look like this: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:begSL2="clr-namespace:CoolDownButton"> </ResourceDictionary>

is the foundation of nearly every major operating system currently available. C (and its objectoriented sister language, C++) is still a popular language due to its raw speed and flexibility. Although languages such as Ruby have been designed to be easy to develop with, C offers a lot of low-level access to developers, along with blazing speed. This makes C perfect for writing performance-intensive libraries and functions that can be called from other programming languages, such as Ruby.

Note This section is not a primer on the C language, as that would be an entire book in its own right,

Figure 2-11. Line numbers and the column indicator turned on Turning Word Wrap on will wrap a line too long to otherwise display within the buffer view. Figure 2-12 shows two buffer views addressing the same buffer (that is, displaying exactly the same data). Line numbering has been turned on in both buffer views, but Word Wrap is turned off in the left one and turned on in the right.

but to learn more about the C programming language itself, visit http://en.wikipedia.org/wiki/

8. Now you can add the actual XAML that will make up the control. First, add a Style tag, with the TargetType set to CoolDownButtonControl. Then add a Setter for the