Sets the amount that the receiver's position will be
modified by when the page up/down keys are pressed
to the argument, which must be at least one.
@param value the page increment (must be greater than zero)
@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>
Sets the amount that the receiver's position will be modified by when the page up/down keys are pressed to the argument, which must be at least one.
@param value the page increment (must be greater than zero)
@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>