Simple .NET/ASP.NET PDF document editor web control SDK

Writing out the spoken information in the off-screen text box before you add a graphic signi cantly reduces the amount of information you otherwise would place in the slide area and instead keeps the slide area simple and clear. This helps working memory focus attention on the single point that you explain verbally during this slide. Instead of reading the headline verbatim, you let the audience quickly read and digest it on their own. BBP uses Notes Page view in this way to tightly integrate screen and narration in order to make the most ef cient use of the two channels of working memory. Looking at the visual and verbal areas together in Notes Page view is like looking at a single frame in a lmstrip, which is made up of a sequence of connected visual frames, each with a corresponding chunk of audio. When you design for multimedia such as lm, you apply a different set of conventions than the ones used for print because a lm model has two coordinated informational tracks a visual track that contains pictures and an audio track that contains the spoken words.

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As you can use Rails to develop both small and large applications, different types of files are organized into different directories to keep elements separated for tidiness on large projects. A lot of pre-created files are also placed within a new, blank Rails project. The quickest way to look at these files and the overall directory structure is to leap right in and create a new Rails project. Your project in this chapter will be to create a simplistic online diary system, similar to a blog (or weblog). The resulting application will let you view your diary, and add, delete, or edit specific entries. The basic features of being able to Create, Read, Update, and Delete items are known as CRUD features, and most types of Web applications feature CRUD mechanisms at one level or another. For example, a photo gallery site allows you to add, view, edit, and delete photos, which are all CRUD actions. Therefore, the mechanics of developing a basic diary tool are easily transferable to developing most other types of Web applications.

Many books have been written about object-oriented program design, and although that s not the focus of this book, I ll give you some pointers: Gather what belongs together. If a function manipulates a global variable, the two of them might be better off in a class, as an attribute and a method. Don t let objects become too intimate. Methods should mainly be concerned with the attributes of their own instance. Let other instances manage their own state. Keep it simple. Keep your methods small. As a rule of thumb, it should be possible to read (and understand) each of your methods in 30 seconds.

When you installed Rails, a script called rails was also installed. You use the rails script to create new Rails projects, their default files, and their directory structure. To use it, navigate to a place in your filesystem where you would like to store Rails projects (possibly creating a rails directory in the process) and run rails, specifying an application name as the sole argument:

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app/controllers app/helpers app/models app/views/layouts config/environments components db doc lib lib/tasks log public/images public/javascripts public/stylesheets script/performance script/process test/fixtures test/functional test/integration test/mocks/development test/mocks/test test/unit vendor vendor/plugins tmp/sessions tmp/sockets tmp/cache Rakefile README app/controllers/application.rb