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

We re using hexadecimal representations because it s easier to relate them to the binary values each hex digit corresponds exactly to four binary digits. We can combine the values together using the | operator (binary OR), for example:

Note It s possible to use negative coordinates to move above and to the left of the (0,0) position.

// (011) Toppings saucy = Toppings.ChocolateSauce | Toppings.ToffeeSauce;

We can use the binary AND operator (&) to see whether a particular flag has been set:

static bool DoYouWantChocolateSauceWithThat(Toppings t) { return (t & Toppings.ChocolateSauce) != 0; }

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Figure 7-1. The x value increases from left to right; the y value increases from the top downward. Figure 7-2 shows how the coordinate system of a widget can be different from the screen when drawing on a widget. The coordinates used when drawing on a widget are aligned so that (0,0) is the upper-left corner of the widget (which is not always the same as (0,0) in the device s global coordinate system). The global coordinate system addresses actual pixels onscreen, dots on printers, and points on other devices.

When defining bit fields, you might not want to allow certain combinations. For example, you might reject the saucy combination, requiring customers to pick, at most, one kind of sauce. Unfortunately, there are no language or platform mechanisms for enforcing that kind of constraint, so you d need to write code to check for illegal combinations in any method that accepted arguments of this type. (Or you could consider an alternative design that does not use an enum at all.)

If you don t specify explicit values, the first item in your list is effectively the default value for the enum (because it corresponds to the zero value). If you provide explicit values, be sure to define a value that corresponds to zero if you don t, fields using your type will default to a value that s not a valid member of the enum, which is not desirable.

We can now access the enumeration property like this:

The EnablePartialRendering property of this control sets how your page will behave insofar as updates are concerned. If this is false (the default), full-page refreshes will occur on roundtrips to the server. If this is true, then postbacks and full-page refreshes are suppressed and replaced with targeted and partial updates. Instead of the application performing a full postback, the application will simulate full postbacks using the XMLHttpRequest object when this is set to true (as you would expect from an Ajax application). On the server side, the page will be processed in the normal way, responding to any controls that call _doPostBack(). Existing server-side postback events will continue to fire, and event handlers will continue to work as they always have. It is intended, by design, that Atlasenabled applications change existing ASP .NET applications as little as possible. The power of the ScriptManager control, when partial rendering is enabled, comes at render time. It determines, with the aid of the UpdatePanel control, which portions of the page have changed. The UpdatePanel, which you will see more of later in this chapter, defines regions in the page that get updated as a chunk. If, for example, you have a page containing a number of chat rooms and you want to update only a single chat room, you would surround that area of the page with an UpdatePanel control. The ScriptManager control will override the rendering of the page and instead will send HTML down to the XMLHttpRequest object for each of the UpdatePanel controls on the page.

Figure 7-2. When drawing on a widget, the upper-left corner of the widget is (0,0).

someBoeing777.Direction = DirectionOfApproach.Approaching;