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The Tools pull-down menu provides a convenient way to manage the IDE The first section from the Tools menu edits the main components of the IDE The Environment Options dialog box is shown in Figure 28-16 This dialog box configures the settings for the IDE There are four tabs, Preferences, Library, Palette, and C++ Builder Direct, which can be configured and set for customizing the IDE See the C++ Builder help files for more details on these tabs and their options The Editor Options menu item opens the Editor Properties dialog box There are several tabs on this dialog box, as shown in Figure 28-17 These tabs provide a way to configure the IDE functions Explore these options and the C++ Builder help files for more details

Yellow frames are out-of-bandwidth profile and will be delivered only if there are adequate bandwidth resources; if, on the other hand, the network is congested, then the frame is discarded A red service frame is also out-of-bandwidth profile and is immediately discarded The Color Mode (CM) parameter specifies whether the UNI is operating in a coloraware or color-blind mode When in a color-aware mode, the color associated with an incoming service frame is employed; in the color-blind mode, the color indication is ignored Bandwidth Profile Rate Enforcement The Bandwidth profile is enforced through a two rate (committed or excess), three-color marker (green, yellow, or red) algorithm, referred to as the trTCM algorithm; this algorithm is usually implemented using a token bucket concept and is shown in Figure 27 Two buckets, one referred to as the committed or C-bucket and the other referred to as the excess or E-bucket, are used Initially, each of these buckets is full of tokens; the C-bucket has green tokens and the E-bucket has yellow tokens As service frames enter the Service Provider network UNI, the same number of tokens in the C-bucket are removed (decreased) If, after this, there are green tokens in the C-bucket, then the service frame is CIR-conformant, colored green, and allowed in the network If no green tokens remain, however, then the E-bucket is checked to determine if any yellow tokens remain If there are yellow tokens, then the service frame is EIR-conformant, colored yellow, and allowed in the network If no yellow tokens are available, then the service frame is colored red and discarded

28:

Figure 5.16 This calculator is blue, even though it looks gray in black-and-white!

Figure 28-13

Bandwidth Profile Defined by Token Bucket Algorithm (2 rates, 3 colors)

The Debugger Options item opens the Debugger Options dialog box as shown in Figure 28-18 This menu item customizes the debugger options

When you provide a single color value, the XAML interprets this to mean that you want a solid brush of that particular color for the entire background. If you want to do something more elaborate, you have to use the more verbose format. You may be familiar with brushes from Windows Forms or SDK programming. The idea is that you set up your brush the way you want to use it (think: dipping it in blue paint) and then use it to paint various things such as the background of a control. When the concept of brushes was first created, the metaphor was good. a brush could have a texture (a pattern) and a color. Brushes have evolved since then, so the metaphor is a little stretched but still mostly works. Now, for example, you can have gradient brushes that start with one color and change to another, image brushes that paint using pictures, or even specialized brushes that paint using controllable surfaces. We ll show many more examples using more complex painting and brushes as we go, but let s look at an example of using a radial gradient brush. (A linear gradient brush starts at one point with one color and goes to another point with another color, whereas a radial gradient starts at one point and radiates outwards to a secondary color.) Here s the XAML:

Figure 28-14

Figure 28-15

<Grid.Background> <RadialGradientBrush> <GradientStop Offset="0" Color="Blue"/> <GradientStop Offset="1" Color="White"/> </RadialGradientBrush> </Grid.Background>

Excess Information Rate (EIR)

Figure 28-16

28:

Here there are only have two gradient stops, but you can add as many as you like. You can also set where the center of the gradient starts and a whole host of other options. Figure 5.17 shows the calculator with the gradient (although it s a little hard to see under the buttons). Throughout XAML, properties often have a shorthand and a verbose way of being expressed. There s also a whole notation for referring to resources and data in properties. For example, if we want the gradient color to be based on the desktop color, we write:

Figure 28-17

Figure 27 Enforcing a predefined bandwidth profile using the token bucket concept (Source: MEF)