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CHAPTER 3 WPF ARCHITECTURE AND APPLICATIONS
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For example, the following code creates a rectangular window with a linear gradient. It uses white and black as its start and end colors, and it uses the top-left corner (0, 0) and the bottom-right corner (1, 1) as the start and end points, respectively. [STAThread] static void Main() { Window win = new Window(); win.Height = 200; win.Width = 275; win.Title = "Linear Gradient Brush"; // Create the end points. Point first = new Point( 0, 0 ); Point second = new Point( 1, 1 ); // Start point // End point
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Start Color End Color Start End LinearGradientBrush lgb = new LinearGradientBrush( Colors.White, Colors.Black, first, second ); win.Background = lgb; Constructor // Apply the brush to the background
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Application app = new Application(); app.Run( win ); } This code produces the window shown in Figure 3-24.
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Figure 3-24. A linear gradient from the four-parameter constructor.
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CHAPTER 3 WPF ARCHITECTURE AND APPLICATIONS
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Using a RadialGradientBrush is similar to using a LinearGradientBrush. Actually, it s even simpler because, by default, a RadialGradientBrush always starts at the center of the canvas and progresses to the outer edges. Therefore, you don t have to specify the start and end points. The following is the syntax for the constructor of a simple RadialGradientBrush. Color at Start Point
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RadialGradientBrush ( Color first, Color second ) Color at End Point The following code creates a rectangular window whose background is painted with a radial gradient brush: [STAThread] static void Main() { Window win = new Window(); win.Height = 200; win.Width = 275; win.Title = "Radial Gradient Brush"; Color at Center Color at Edges RadialGradientBrush lgb = new RadialGradientBrush ( Colors.White, Colors.Black ); Constructor win.Background = lgb; Application app = new Application(); app.Run( win ); } This code produces the window shown in Figure 3-25.
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Figure 3-25. A linear gradient from the two-parameter constructor
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CHAPTER 3 WPF ARCHITECTURE AND APPLICATIONS
The Application Class
The Application class is the harness that hosts your program and the infrastructure that allows it to run. Every WPF application has a single instance of an object of the Application class. Some of the important things to know about the class are the following: The Application class starts your program running and manages the messages that drive it. The Application class is a member of the System.Windows namespace. This is different from the Application class for Windows Forms programs, which is in the System.Windows.Forms namespace. Figure 3-26 illustrates the Application class and some of its important members. The Run method starts the program running and calls the OnStartup method, which will be described later in this chapter. The Current property is a static property that returns a reference to the program s Application object. The ShutdownMode property can hold one of three values of the ShutdownMode enumeration. The value specifies the condition on which the application should be shut down. The enumeration values are the following. OnLastWindowClose: The application closes when its last window closes. OnMainWindowClose: The application closes when its main window closes. OnExplicitShutdown: The application closes only when its Shutdown method is called.
The StartupUri property holds the location of the UI to start when the application starts.
Figure 3-26. The members of the Application class manage the life cycle of the application.
CHAPTER 3 WPF ARCHITECTURE AND APPLICATIONS
Handling Application Events
During an application s lifetime, it goes through various stages, such as startup, activation, deactivation, and shutdown. Some of these stages are signaled by events. If you want your program to execute its own code when these events occur, you can write handlers and attach handlers to the events.
Application Lifetime Events
The Application class has seven events that can be raised at various points in an application s lifetime. The following five are the most common: Startup is raised by the Run method when the application is first starting up. Exit is raised when the application is closing down. Activated is raised when the application becomes the foreground application. Deactivated is raised when a different application becomes the foreground application. SessionEnding is raised when the Windows session is ending. This usually means the computer is shutting down.
You can associate methods (event handlers) with an application s events, using either markup or code. Then, when those events are raised, your event handlers will be called. The naming convention for the event handlers is to preface the name of the event with the string App_. The process for attaching a handler to an event is the following: 1. Create an event handler for the event. The event handler is a method with the following characteristics: It contains the code you want executed when the event is raised. It has a return type of void and has the signature shown in Table 3-1. By convention, the name of the handler starts with App_ followed by the name of the event. Notice that the second parameter is specific to the event.
Add the event handler to the Application object s event, as shown in the following code. Now, whenever event Startup is raised, it will invoke method App_Startup. (Variable app in this line of code is an object of type Application.) app.Startup += App_Startup; Event Handler
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