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

Figure 6-2. The devel module provides a Switch user block to quickly log in and interact with the site as other users with their role and permissions. Rock on!

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Some of the types used to construct a user interface are interactive elements with a distinctive behavior of their own, such as buttons, checkboxes, and listboxes. Although you need code to connect these elements to your application, they have some built-in interactive behavior: buttons light up when the mouse cursor moves over them and look pushed in when clicked; listboxes allow items to be selected; and so on. Other elements are more primitive. There are graphical shape elements and text elements, which are visible to the user but which don t have an intrinsic behavior if you want them to do more than simply be visible you need to write code to make that happen. And some elements don t even appear directly; for example, there are layout elements that are often not visible themselves, as their job is to decide where other elements go. You can tell what type of element you re dealing with by looking at the corresponding .NET type s base class. Most UI elements ultimately derive from FrameworkEle ment, but this class has some more specialized subtypes. Panel is the base class of layout elements. Shape is the base class of elements involving 2D graphical shapes. Control is the base class of elements that have some intrinsic interactive behavior of their own.

This means that not all UI elements are controls. In fact, the majority of UI elements are not controls. Having said that, the term control is often used loosely many authors, and even some parts of Microsoft s documentation, use the term control to describe any UI element, including ones that don t in fact derive from Control. To further confuse the issue there s a System.Windows.Controls namespace, in which not all of the types derive from Control. We believe this is confusing, so in this book, we will use the term control only when talking about types that derive from Control. When we re discussing features that apply to all UI objects that derive from FrameworkElement (which includes all controls) we will use the more general term element. But be aware that you will come across other, more confusing conventions on the Web and in other books.

The file path is /download/details.aspx, which is a reasonable attempt to be descriptive with the source code name, but it s a generic page that fetches the actual download details from a database. The filename can t possibly contain the important information that the URL should contain. Even worse, an unreadable GUID is used to identify the actual download, and at this point the URL has lost all meaning. This is a perfect opportunity to create a beautiful URL. Decouple the source code filename from the URL, and it can become a resource locator again with the resource being a download package for Internet Explorer. The user never needs to know that this resource is served by a page called details.aspx. The result would look like this:

Before we get to the controls, we ll look at how elements are positioned and sized interactive elements are not much use if you can t choose where they appear.

elements. You choose a particular concrete derived type to determine which layout mechanism to use. Silverlight version 3 offers three panel types: Grid, StackPanel, and Canvas. WPF provides these and a few more, as we ll see shortly.

This is clearly an improvement, but we re assuming that the description of the item is unique. Ideally, in the design of an application, we could make some human-readable information like the title or description unique to support the URL schema. If this weren t possible, we could implement another technique to end up with something like the following URL:

default in a new UI. As the name suggests, it carves up the available space into rows and columns, and then positions child elements into the resultant grid cells. By default, a Grid has a single row and a single column, making just one big cell, but you can add more. Example 20-4 shows how to do this.