ASP.NET PDF Viewer using C#, VB/NET

The various width and height properties are useful when an element is being asked to determine its own size, such as in Auto sized grid cells. But sometimes an element s layout slot size is imposed on it for example, if your Silverlight user interface is configured to fill the entire browser window, the user is in charge of how big it is. This is sometimes referred to as constrained layout this describes situations where the layout system has to make things fit a predetermined space, rather than trying to work out how much space is required. Most user interfaces contain a mixture of constrained and unconstrained layout the top level of the UI is usually constrained by window size, but you might have individual elements such as text blocks or buttons that have to be large enough to display their content.

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When elements that have no intrinsic size are put in a constrained layout, they will fill the space available if you don t set the width and height. For example, if you put an Ellipse as the only element of the root Grid layout element, and you don t set any of the width or height properties, it will fill the whole Silverlight application UI.

You can even get a mixture of constrained and unconstrained layouts on one element. In Figure 20-3, we saw a vertical stack of elements, and vertically, each one s size was based on its content since the elements are free to size themselves it means we have unconstrained layout vertically. But the elements are all the same width regardless of content, indicating that constrained layout was in use horizontally. Stack panels always work this way children are unconstrained in the direction of stacking, but are constrained to have the same sized layout slots in the other direction. When an element has more space than it needs due to constrained layout, additional properties that determine what the element does with the excess space come into play. The HorizontalAlignment attribute lets you position the element within its slot. Example 20-7 shows a modified version of Example 20-5, specifying each of the four HorizontalAlignment options.

{ controller: foo action: bar }

The Drupal blog module is designed for multiple users. The module allows any user with permission to create a blog. The blog is a content type with a system-generated page and one block (you can create many more using the view module, discussed in 7). Users are given permission to post content to their own blog, available at http://example.com/blog/UID, where UID is the user s ID. All blog posts are displayed in a list at http://example.com/blog. The blog is a content type and does not have many configurable options; additional options and features must be added through other modules. Edit the blog content type at Structure Content types Blog EDIT, as shown in Figure 6-7. The vertical tab menu contains the same configuration settings as a regular content type; see 4 for instructions on how to configure a content type.

Figure 20-5 shows the results. As before, each child has been given a layout slot that fills the whole width of the StackPanel, but all except the third row have been sized to content, and have then positioned themselves within their slot based on the HorizontalAlignment property. The third button still fills the whole of its row because its alignment is Stretch. That s the default, which is why elements fill their whole layout slot unless you specify an alignment. VerticalAlignment works in much the same way, offering Top, Bottom, Center, and Stretch.

The alignment properties do something only when the layout slot is larger than the element requires. When an element has been given a slot exactly as large as it asked for in either the horizontal or vertical dimension, the corresponding alignment property does nothing. So setting VerticalAlignment on the child of a vertical StackPanel does nothing the layout slot is already exactly as tall as the element requires, so the element is simultaneously at the top, the bottom, and the center of the slot.

Figure 16.2 Outbound routing generates appropriate URLs from a given set of route data (usually controller and action).

Another very important ubiquitous layout property is Margin this lets you specify the amount of space you d like between the edge of an element and the boundary of its layout slot. In unconstrained layout, a margin will cause an element to be given a larger slot than it would otherwise have had, while in constrained layout, it causes an element to fill less of the slot than it otherwise would have. Example 20-8 illustrates this within a vertical StackPanel since this uses constrained horizontal layout and unconstrained vertical layout for its children, we ll see both effects.

independent of the application logic. As long as it s never bypassed when constructing links in a view, the URL schema should be trivial to change independent of the application logic. Now let s take a look at how to build a meaningful URL schema for our application.

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ASP.NET PDF Viewer using C#, VB/NET