Returns the preferred size of the receiver.
<p>
The <em>preferred size</em> of a control is the size that it would
best be displayed at. The width hint and height hint arguments
allow the caller to ask a control questions such as "Given a particular
width, how high does the control need to be to show all of the contents?"
To indicate that the caller does not wish to constrain a particular
dimension, the constant <code>SWT.DEFAULT</code> is passed for the hint.
</p>
@param wHint the width hint (can be <code>SWT.DEFAULT</code>)
@param hHint the height hint (can be <code>SWT.DEFAULT</code>)
@return the preferred size of the control
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
</ul>
@see Layout
@see #getBorderWidth
@see #getBounds
@see #getSize
@see #pack(bool)
@see "computeTrim, getClientArea for controls that implement them"
Returns the preferred size of the receiver. <p> The <em>preferred size</em> of a control is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the control need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant <code>SWT.DEFAULT</code> is passed for the hint. </p>
@param wHint the width hint (can be <code>SWT.DEFAULT</code>) @param hHint the height hint (can be <code>SWT.DEFAULT</code>) @return the preferred size of the control
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> </ul>
@see Layout @see #getBorderWidth @see #getBounds @see #getSize @see #pack(bool) @see "computeTrim, getClientArea for controls that implement them"