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

In Figure 20-6, the first button fills the entire width because it has no margin. But each successive button gets narrower, because each has a larger margin than the last. Since the width is constrained, the layout system needs to make the buttons narrower to provide the specified margin between the element s edges and its layout slot. But since the children here are unconstrained vertically, the margin has no effect on their vertical size, and instead ends up adding increasing amounts of space between each element in the unconstrained case, Margin makes the slot larger.

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Figure 6-7. The blog s display settings are configured on the content type page at Structure Content types Blog EDIT. You may also want to change comment settings, which affects the way comments display on http://example.com/blog and http://example.com/blog/UID. Comments have a number of options that can be configured at the content type level. Comments can be displayed either as a straight list or as threaded. A threaded list groups comments according to replies; if a user posts a comment and three people reply to that comment, those four posts are considered a thread and grouped together. When displaying comments, Drupal automatically includes a pager (that is, links to page 1, page 2, and so on) to view additional comments when the number of comments per page is exceeded. The Allow comment title check box adds a comment title field in the comment form that allows users to create a custom title for their comment. If the check box is deselected, Drupal creates a title for the comment based on the first 29 characters of the comment. It is important to note that the Default comment settings for new posts setting applies only to new content; changing this setting to Closed (or vice versa) will not affect previously created nodes.

Example 20-8 specifies the margins as single numbers, denoting a uniform margin on all four sides, but you can be more precise. You can provide two numbers, setting the horizontal and vertical margins. Or you can provide four numbers, indicating the left, top, right, and bottom margins independently. This enables precise positioning of elements within a Grid it turns out that you don t have to use a Canvas to specify the position of an element. If you align an element to the left and the top, the first two numbers in a margin effectively determine its position within the containing grid cell, just as the attachable Canvas.Left and Canvas.Top properties work for children of a Canvas. The interactive design surfaces in Visual Studio and Blend use this to let you drag elements around on a grid and place them exactly where you want. It appears to be a completely free form of layout, but if you inspect what these programs do to the Xaml as you move elements around, they simply set the alignment properties appropriately and adjust the margins. All of the layout features we ve looked at so far take a rigidly rectangular approach everything is either strictly horizontal or strictly vertical. In fact, WPF and Silverlight are a bit more flexible than that, thanks to their support for transforms.

Yes, that is a different order than CSS. Silverlight and WPF follow the coordinate geometry convention of specifying pairs of coordinates as horizontal and then vertical measures x before y. Hence left, then top, followed likewise by right, then bottom.

As a professional developer, you wouldn t start coding a new project before mapping out what the application will do and how it will look. The same should apply for the URL schema of an application. Although it s hard to provide a definitive guide on designing URL schema (every website and application is different), we ll discuss general guidelines with an example or two thrown in along the way. Here s a list of guidelines:

You can apply a transform to any element, modifying its size, position, and orientation, or even skewing it. (If you re familiar with the coordinate geometry features found in most modern graphics system, you ll recognize these as being the usual twodimensional affine transformations possible with a 2 3 matrix. ) Example 20-9 shows another variation on our StackPanel example, with transforms applied to the children.

<StackPanel Orientation="Vertical"> <Button Content="Buttons" FontSize="30"> <Button.RenderTransform> <ScaleTransform ScaleX="1.5" ScaleY="0.5" /> </Button.RenderTransform> </Button> <Button Content="in"> <Button.RenderTransform> <RotateTransform Angle="30" /> </Button.RenderTransform> </Button> <Button Content="a"> <Button.RenderTransform> <SkewTransform AngleX="30" /> </Button.RenderTransform> </Button> <Button Content="stack"> <Button.RenderTransform> <TranslateTransform Y="-50" /> </Button.RenderTransform> </Button> </StackPanel>

Make simple, clean URLs. Make hackable URLs. Allow URL parameters to clash. Keep URLs short. Avoid exposing database IDs wherever possible. Consider adding unnecessary information.