Illustrated WPF phần 2 ppt

CHAPTER 2 ■ OVERVIEW OF WPF PROGRAMMING

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• This code produces the window shown in Figure 2-13.

Figure 2-13. The resulting window

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Important Properties of a Window

When you look at a window on the screen, you’ll see several things. These include the client area, which

consists of its content and background, and the nonclient area, which consists of the window border and

the window bar at the top. The appearance of these items is controlled by five properties: Title, Content,

Foreground, Background, and WindowStyle.

The Window object is illustrated in Figure 2-14.

Figure 2-14. A few of the many important properties of the Window class

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WindowStyle

The WindowStyle property gets or sets the characteristics of the nonclient area, including the border style

and the buttons shown in the window bar.

The values that the WindowStyle property can accept are the following:

• SingleBorderWindow: This is the default style. It has the following:

− A plain single border around the client area

− A minimize, maximize, and close button in the window bar

− An application icon in the window bar

• ThreeDBorderWindow: This is similar to the SingleBorderWindow value, but the inside

of the border is beveled.

• ToolWindow: This is like the SingleBorderWindow value but doesn’t have the icon or

the minimize or maximize buttons in the window bar. Also, the border is thinner.

• None: This style has a thin border and no window bar.

The following code produces the top-left window shown in Figure 2-15. You can produce the

other three windows by changing the WindowStyle property.

[STAThread]

static void Main()

{

Window win = new Window();

win.Height = 75; win.Width = 300;

win.Title = "WindowStyles";

WindowStyle

↓

win.WindowStyle = WindowStyle.SingleBorderWindow; // Set property

win.Content = win.WindowStyle.ToString();

Application app = new Application();

app.Run( win);

}

Figure 2-15. Examples of the four different values of the WindowStyle property

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Content

Unlike previous frameworks for building Windows programs, the content of a Window object always

consists of a single object. That object might, in turn, contain other objects⎯but it’s still a single object.

I’ll explain much more about this in Chapter 5 and Chapter 6.

For example, the following code creates a button and assigns the button as the content of the

window:

public MyWindow()

{

Title = "My Program Window";

Width = 300; Height = 200;

Button btn = new Button(); // Create a button.

btn.Content = "Click Me"; // Set the button's text.

Set the button to be the window content.

↓

Content = btn;

}

Figure 2-16 shows the resulting window. When first looking at this window, some people have

trouble seeing the button immediately. That’s because it takes up the whole window.

Figure 2-16. A button as the content of a window