If the argument is <code>false</code>, causes subsequent drawing
operations in the receiver to be ignored. No drawing of any kind
can occur in the receiver until the flag is set to true.
Graphics operations that occurred while the flag was
<code>false</code> are lost. When the flag is set to <code>true</code>,
the entire widget is marked as needing to be redrawn. Nested calls
to this method are stacked.
<p>
Note: This operation is a hint and may not be supported on some
platforms or for some widgets.
</p>
@param redraw the new redraw state
@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>
If the argument is <code>false</code>, causes subsequent drawing operations in the receiver to be ignored. No drawing of any kind can occur in the receiver until the flag is set to true. Graphics operations that occurred while the flag was <code>false</code> are lost. When the flag is set to <code>true</code>, the entire widget is marked as needing to be redrawn. Nested calls to this method are stacked. <p> Note: This operation is a hint and may not be supported on some platforms or for some widgets. </p>
@param redraw the new redraw state
@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 #redraw(int, int, int, int, bool) @see #update()