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CHAPTER 5 IMPLEMENTING COMPONENT GROUPINGS
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textbox1.Text = textbox2.Text; Looking at the original code and the new code, it would seem yet again a relatively simple implementation was complicated beyond reasonable measure. Yet this is incorrect, because with the new implementation, we have the ability to properly test the logic without resorting to GUI test scripts, and the ability to dynamically switch GUI toolkits or mix and match data sources. In the end, the result is a flexible and maintainable application. Of course, this doesn t mean everything will need to use this architecture. There are instances when the code only relates to the GUI and doesn t contain any application logic. An example could be that when a button is pressed, another control will mark itself as busy. The key question that you must ask yourself is whether the action only affects the GUI, or whether the action affects the data managed by the application. If the answer is the latter, then you need to separate GUI logic from application logic.
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Implementing the Translation Services
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Applying Template pattern based separation of GUI logic from application logic concepts to BusinessLogic and translation services means removing the application logic code from the TranslationTextBox type, and moving the functionality into another type. Following is the previously defined BusinessLogic class modified to perform a translation service using the Template pattern: public class TranslationServices<GUIAdapter> where GUIAdapter: IControlAdapter, new() { private ITranslationServices _translation; private Loader _loader; private GUIAdapter _adapter; public TranslationServices() { _loader = new Loader(); _loader.Load(); _translation = _loader.CreateGermanTranslationDynamic(); _adapter = new GUIAdapter(); } public void DoTranslation<Control1, Control2>(Control1 src, Control2 dest) { _adapter.SetValue(dest, _translation.Translate(_adapter.GetValue<Control1, string>(src))); } } The class TranslationServices has a generic parameter, GUIAdapter, which is the functionality used to retrieve and assign GUI data values. _translation and _loader are the data members that have been removed from TranslationTextBox. The data member _adapter is of Generic type GUIAdapter and provides the interface to the GUI toolkit. The method DoTranslation accepts as a parameter the source and destination GUI elements. Since some elements have been removed from TranslationTextBox, the modified class needs to be shown again:
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CHAPTER 5 IMPLEMENTING COMPONENT GROUPINGS
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public class TranslationTextBox: System.Windows.Forms.TextBox, Abstractions.IControlAdapter { public TranslationTextBox() { } protected override void OnTextChanged(EventArgs e) { DoTranslation(); } public void DoTranslation() { Form parent; TextBox othertextbox; parent = this.Parent as Form; othertextbox = parent.Controls["textbox2"] as TextBox; Abstractions.TranslationServices<TranslationTextBox> srvc = new Abstractions.TranslationServices<TranslationTextBox>(); srvc.DoTranslation( this, othertextbox); } } The class TranslationText implements the interface Abstractions.IControlAdapter, which is the GUI adapter mentioned previously, and will be explained in the next section. Removed from TranslationTextBox are the details to the translation services. Added to the method DoTranslation is the reference to the application logic class TranslationServices. Now let s step back and look at the resulting architecture in UML terms as illustrated in Figure 5-4.
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Figure 5-4. UML architecture of the translation tool using the Template pattern
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CHAPTER 5 IMPLEMENTING COMPONENT GROUPINGS
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As shown in the diagram, what has happened is that the TranslationTextBox class has separated the GUI logic (BasicForm, Form, and TextBox) from the application logic (TranslationServices, Loader, ITranslationServices). The class TranslationTextBox is the glue that holds both pieces together to perform a translation. When the GUI changes, the only class to update is TranslationTextBox, and when the application logic changes again, only class TranslationTextBox changes. At this point, it can be said that the tightly coupled application at the beginning has become loosely coupled. And all this has happened using a few design patterns and object-oriented design principles.
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Implementing the Adapter Pattern
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Now we come to the GUI adapter. I delayed the explanation until now because there are some specific problems addressed by the Adapter pattern that can t be explained in a single sentence or paragraph. Refer back to the interface IControlAdapter shown in Figure 5-4. This interface implements the Adapter pattern.6 The general idea behind this pattern is to adapt one set of operating conditions to another. In technical terms, this means exposing a predefined interface to use another set of interfaces not directly related to the predefined interface. In simple terms, the Adapter pattern makes a square peg fit in a round hole.
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