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public class TranslationTextBox : System.Windows.Forms.TextBox { private System.Windows.Forms.TextBox _textBox; private ITranslationServices _translation; public TranslationTextBox(System.Windows.Forms.TextBox textbox) { _textBox = textbox; } protected override void OnTextChanged( EventArgs e) { _textBox.Text = _translation.Translate(this.Text); } public void AssignTranslation(ITranslationServices translation) { _translation = translation; } } The class TranslationTextBox subclasses the standard textbox System.Windows. Forms.TextBox and has two private data members: _textBox and _translation. The two data members are required because object-oriented programming means each object is responsible for its own actions. In this case, this means the textbox is responsible for performing a translation and then assigning that value to another textbox, which is the data member _textBox. The base class method OnTextChanged is overwritten so that whenever the contents of the textbox change, a translation will be started. The translation code is identical to the translation code written in the previous pattern for the method button1_Click. The method AssignTranslation is added so that the ITranslationServices instance can be assigned to TranslationTextBox, fulfilling the object-oriented requirement that a type is responsible for its own actions. Putting all of this together is a bit tricky because multiple changes have to be made. The first change is to BasicForm because the form data member textbox1 has to be updated to use the type TranslationText, and not the original textbox that was generated by the GUI designer. The changes are illustrated as follows (note that many parts of the code have been deleted for clarity): namespace Chap05.GenericGUI { partial class BasicForm { private ITranslationServices _translation; private Loader _loader; public BasicForm() { InitializeComponent(); _loader = new Loader(); _loader.Load(); _translation = _loader.CreateGermanTranslationDynamic(); textBox1.AssignTranslation(_translation); } private System.ComponentModel.IContainer components = null;

Printer Sharing (port 1179) XGrid (port 4111)

There are very few access controls for printing services. Your computer could be abused as a grid client, reducing your performance.

private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.textBox2 = new System.Windows.Forms.TextBox(); this.textBox1 = new TranslationTextBox(this.textBox2); this.SuspendLayout(); } private System.Windows.Forms.Button button1; private TranslationTextBox textBox1; private System.Windows.Forms.TextBox textBox2; } } When the GUI designer created BasicForm, the data member textBox1 was defined to be of type System.Windows.Forms.TextBox and is updated to be TranslationTextBox. The method InitializeComponent needs to be altered to create the type TranslationTextBox, but the order of creation for textBox1 and textBox2 is reversed from the original. The reason is because the constructor of the TranslationTextBox requires the translation destination textbox. And finally, so that a translation does work in a constructor of BasicForm, the code is updated to assign the translation services to textBox1 using the method AssignTranslation. Stepping back and looking at the code, you can see that it s brittle. This common dilemma results from types needing to know about other types. Remember in 1 that one of the big problems in object-oriented applications is type referencing. When types reference too many other types, an application becomes brittle, and changes are very difficult to introduce. This application is starting to become brittle because of the simple desire to have text translated dynamically. Maybe this specific problem could have been avoided using a different programming strategy than what I presented. However, even a different programming strategy will encounter brittle code, as types will always reference other types. To fix the brittle code problem, let s consider the architecture as a UML diagram (see Figure 5-2).

The voltage sensor design in Figure 7-11 allows the input signal to swing from 15V to +15V and needs only two resistors. You can get 15k (5% color code: brown-green-orange-gold) resistors from Radio Shack in their assortment packs, but if you don t want to buy the 30k (5% color code: orangeblack-orange-gold) from another supplier, you need to make it from two 15k resistors in series.

Any time you are enabling the firewall on a Mac, you must first determine which services to enable and which to disable, as described in the previous section. Once you have enough information to understand what you are trying to control by configuring the firewall, you re ready to move onto the nuts and bolts of working with it. First things first let s turn it on.

Taking a quick glance at Figure 5-2, it s obvious that the various references between the individual types are numerous and therefore are creating brittle code. The objective is to clean up the references.

Out of the box, the firewall in any version of Mac OS X is turned off by default. Click the Firewall tab of the Security system preferences (see Figure 8-2). Then click the Set Access for Specific Services and Applications option (make sure the padlock icon at the bottom of the screen is unlocked). Enabling the firewall allows incoming connections only from certain Apple services such as Personal File Sharing or Web Services by default. To enable other services, you must add them based on the application rather than just the port number. This gives each application access to open ports on the firewall.

Figure 7-11. 15V to +15V sensor circuit Figure 7-12 shows the plot of external voltage and Raw value. The program shown in Figure 7-13 is basically the same as the 5V to +5V program, except the numbers are scaled up by a factor of 3. A NXT2 version would multiply by 30, subtract only 15, and automatically show the value with a decimal point.

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