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RE: [platform-swt-dev] Inheritance and SWT
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org.eclipse.swt.widgets.Widget.java, line 248 and following:
* Checks that this class can be subclassed.
* <p>
* The SWT class library is intended to be subclassed
* only at specific, controlled points (most notably,
* <code>Composite</code> and <code>Canvas</code> when
* implementing new widgets). This method enforces this
* rule unless it is overridden.
* </p><p>
* <em>IMPORTANT:</em> By providing an implementation of this
* method that allows a subclass of a class which does not
* normally allow subclassing to be created, the implementer
* agrees to be fully responsible for the fact that any such
* subclass will likely fail between SWT releases and will be
* strongly platform specific. No support is provided for
* user-written classes which are implemented in this fashion.
* </p><p>
* The ability to subclass outside of the allowed SWT classes
* is intended purely to enable those not on the SWT development
* team to implement patches in order to get around specific
* limitations in advance of when those limitations can be
* addressed by the team. Subclassing should not be attempted
* without an intimate and detailed understanding of the hierarchy.
* </p>
You can simply override this method in your derived widget by an empty
method. You don't even need to change the SWT source base:
protected void checkSubclass () { //don't throw the exception}