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The keyCode that s passed to the keyPressed(int keyCode) method can tell you only about a single key and therefore will be called multiple times even if the user presses two keys at the same time In a game, the precise timing of each keystroke is often important, so the Canvas method keyPressed() loses valuable information Looking at the method checkKeys() in Listing 3-3, you can see that the value returned by getKeyStates() contains all the keystroke information All you need to do is perform a bitwise and (&) between the getKeyStates() return value and a static field such as GameCanvasLEFT_PRESSED to tell if a given key is currently being pressed.

using Microsoft.Practices.EnterpriseLibrary.Common.Configuration; using Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder; using Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation; namespace SampleAB { /// <summary> /// This provider adds two numbers and returns the result. /// </summary> [ConfigurationElementType(typeof( SampleAB.Configuration.CustomSampleProviderData))] public class AddProvider : SampleAB.SampleProvider { /// <summary> /// <para>Initializes a new instance of the /// <see cref="AddProvider"/>.</para> /// </summary> /// <param name="values">The value collection used to /// set the runtime values.</param> public AddProvider(NameValueCollection values) { // TODO: Later. Use the NameValueCollection object // to set runtime values for the AddProvider } protected override int Calculate(int x, int y) { return x + y; } } } Now to create SubtractProvider, repeat the same procedure as used to create AddProvider, except the implementation will be to subtract y from x.

CHAPTER 8 JOHNNXT IS ALIVE!

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One of the great features of creating an application block is the ability to use the Enterprise Library Configuration Console to define the configuration settings that will be used with the application block. The Application Block Software Factory contains recipes that will help with building these design-time configuration features. Two nodes are typically created for a particular application block: The base provider node, which specifies which provider will be used The provider node, which specifies configuration settings for the provider itself We ll create both of these nodes for our sample application block.

This is a large class file, but you can see the main idea of how it works by recalling that the main loop of the GameThread class first tells my GameCanvas subclass (called JumpCanvas) to query the key states (see the method JumpCanvascheckKeys() in Listing 3-3 for details) Then once the key events have been dealt with, the main loop of the GameThread class calls.

Follow these steps to create a design-time base provider node: 1. Run the Create Design-Time Base Provider Node recipe. You can do this using the Guidance Navigator or by right-clicking the design-time project within the Solution Explorer and selecting Application Block Software Factory Create Design-Time Base Provider Node. 2. The Create Design Time Base Provider Node dialog box appears, as shown in Figure 4-14. In the Node Name field, enter Math, and then click the ellipsis next to the Runtime Configuration Type field.

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Figure 14-14. Create Design-Time Base Provider Node dialog box 3. In the dialog box, you will see the SampleAB project that is referenced in the design-time project. It is important that you select the base class and not the custom class. In this example, select the SampleProviderData class, which is the base class, and then click OK.

JumpCanvas.advance(), which tells the LayerManager to make appropriate updates in the graphics (more on that in the next sections) and then paints the screen. Listing 3-3 shows the code for JumpCanvas.java. Listing 3-3. JumpCanvas.java package net.frog_parrot.jump; import javax.microedition.lcdui.*; import javax.microedition.lcdui.game.*; /** * This class is the display of the game. * * @author Carol Hamer */ public class JumpCanvas extends javax.microedition.lcdui.game.GameCanvas { //--------------------------------------------------------// dimension fields // (constant after initialization) /** * the height of the green region below the ground. */ static final int GROUND_HEIGHT = 32; /** * a screen dimension. */ static final int CORNER_X = 0; /** * a screen dimension. */ static final int CORNER_Y = 0; /** * a screen dimension. */ static int DISP_WIDTH; /** * a screen dimension. */ static int DISP_HEIGHT;

CHAPTER 8 JOHNNXT IS ALIVE!

because the Application Block Software Factory uses reflection to determine the provider base and configuration base types of the referenced projects. So if the projects were not built, they will not show up when you are adding a design-time base provider node.

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