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POHow would you design the the control tree/hierarchy without inheritance?
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copied!<p>I am aware of the responses at <a href="https://stackoverflow.com/questions/49002/prefer-composition-over-inheritance">Prefer composition over inheritance</a> and am aware of the merits of composition over inheritance.</p> <p>But there are cases where inheritance does have a good role to play. It's the incorrect use of inheritance hierarchy that causes all the issues related to reuse.</p> <p>Take the example of the following controls...</p> <pre><code>Button/Textbox/Combobox/ListBox/Grid etc. </code></pre> <p>Typically they are implemented as</p> <pre><code>public class Control { ... } public abstract class TextBoxBase : control { .... } public class TextBox : TextBoxBase { .... } public abstract class ButtonBase: control { .... } public class Button: ButtonBase { .... } public class TextBox : TextBoxBase { .... } public class NumericTextBox: TextBox { .... } </code></pre> <p>NOTE: Both the UI and the functionlity is reusable.</p> <p>I may be wrong or partially correct. Your thoughts would only help me improve my understanding of this subject.</p> <p>How would you go about designing the control model/hierarchy without using inheritance, and which one do you think is better?</p> <p>Please take into account the ease of use, use of IDE for this control as well.</p> <p><strong>P.S: This question is also inspired by <a href="https://stackoverflow.com/questions/361371/should-inheritance-of-non-interface-types-be-removed-from-programming-languages">this question</a>.</strong></p>

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