.NET/ASP.NET/C#/VB.NET PDF Document SDK

Before you re ready to draw the text, you must translate the painter (more about this soon) because the text document will start painting its text at the (0,0) coordinate Before translating the painter, save the current state (it s later restored with a call to the restore method) Because you translated the painter, you must also translate the rectangle when you call drawContents to draw the text to the given painter inside the given rectangle QTextDocument doc; docsetHtml( "<p>A QTextDocument can be used to present formatted text " "in a nice way</p>" "<p align=center>It can be <b>formatted</b> " "<font size=+2>in</font> <i>different</i> ways</p>" "<p>The text can be really long and contain many " "paragraphs It is properly wrapped and such..</p>" ); recttranslate( 0, rectheight()+10 ); rectsetHeight( 160 ); docsetTextWidth( rectwidth() ); paintersave(); paintertranslate( recttopLeft() ); doc.

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It isn t just functions that we can declare as static. Fields and properties can be static, too. In fact, we ve already seen a special kind of static field the const value we defined for the conversion between miles and kilometers. There was only one conversion factor value, however many objects we instantiated. The only difference between a const field and a static field is that we can modify the static field. (Remember: the const field was immutable.) So, a static property or field effectively lets us get or set data associated with the class, rather than the object. No matter how many objects we create, we are always getting and setting the same value. Let s look at a trivial illustration, shown in Example 3-42, to explore how it works, before we think about why we might want to use it.

public class MyClassWithAStaticProperty { public static bool TrueOrFalse { get; set; } public void SayWhetherTrueOrFalse()

{ } }

Console.WriteLine("Object is {0}", TrueOrFalse);

drawContents( &painter, recttranslated( -recttopLeft() ) ); painterrestore(); painterdrawRect( rect ); As shown in Figure 7-13, the entire contents of the text document would not fit into the given rectangle Once again, there is a way to determine the height needed by the text In this case, use the height property of the size property from the QTextDocument In the following source code, you use this height to determine the size of the gray rectangle drawn below the rendered text document This rectangle shows how long the text really is recttranslate( 0, 160 ); rectsetHeight( docsize()height()-160 ); paintersetBrush( Qt::gray ); painterdrawRect( rect );.

class Program { static void Main(string[] args) { // Create two objects MyClassWithAStaticProperty object1 = new MyClassWithAStaticProperty(); MyClassWithAStaticProperty object2 = new MyClassWithAStaticProperty(); // Check how the property looks to each object, // and accessed through the class name object1.SayWhetherTrueOrFalse(); object2.SayWhetherTrueOrFalse(); Console.WriteLine("Class is {0}", MyClassWithAStaticProperty.TrueOrFalse); // Change the value MyClassWithAStaticProperty.TrueOrFalse = true; // And see that it has changed everywhere object1.SayWhetherTrueOrFalse(); object2.SayWhetherTrueOrFalse(); Console.WriteLine("Class is {0}", MyClassWithAStaticProperty.TrueOrFalse); } Console.ReadKey();

As in this case, the ScriptManager control already has a template associated with it, and the option Remove Error Template is present. Figure 6-10 shows how the ScriptManager Tasks Assistant will appear when no template is present.

}

If you compile and run this code in a console application project, you ll see the following output:

Note Although it is fairly easy to draw text using the drawText method, you might want to use the

Software development platforms do not succeed purely on their own merits context matters. For example, widespread availability of third-party components and tools can make a platform significantly more compelling. Windows is perhaps the most striking example of this phenomenon. Any new programming system attempting to gain acceptance has a considerable advantage if it can plug into some existing ecosystem, and one of the biggest differences between C# and Java is that C# and the .NET Framework positively embrace the Windows platform, while Java goes out of its way to insulate developers from the underlying OS. If you re writing code to run on a specific operating system, it s not especially helpful for a language to cut you off from the tools and components unique to your chosen platform. Rather than requiring developers to break with the past, .NET offers continuity by making it possible to work directly with components and services either built into or built for Windows. Most of the time, you won t need to use this the class library provides wrappers for a lot of the underlying platform s functionality. However, if you need to use a third-party component or a feature of the operating system that doesn t yet have a .NET wrapper, the ability to work with such unmanaged features directly from managed code is invaluable.

While .NET offers features to ease integration with the underlying platform, there is still support for non-Windows systems. Microsoft s Silverlight can run C# and VB.NET code on Mac OS X as well as Windows. There s an open source project called Mono which enables .NET code to run on Linux, and the related Moonlight project is an open source version of Silverlight. So the presence of local platform integration features doesn t stop C# from being useful on multiple platforms if you want to target multiple operating systems, you would just choose not to use any platform-specific features. So the biggest philosophical difference between C# and Java is that C# provides equal support for direct use of operating-system-specific features and for platform independence. Java makes the former disproportionately harder than the latter.