Returns an integer hash code for the receiver. Any two
objects that return <code>true</code> when passed to
<code>equals</code> must return the same value for this
method.
@return the receiver's hash
@exception SWTException <ul>
<li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
</ul>
Returns an integer hash code for the receiver. Any two objects that return <code>true</code> when passed to <code>equals</code> must return the same value for this method.
@return the receiver's hash
@exception SWTException <ul> <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> </ul>
@see #equals