@param start offset of the first character to redraw
@param length number of characters to redraw
@param clearBackground true if the background should be cleared as
part of the redraw operation. If true, the entire redraw range will
be cleared before anything is redrawn. If the redraw range includes
the last character of a line (i.e., the entire line is redrawn) the
line is cleared all the way to the right border of the widget.
The redraw operation will be faster and smoother if clearBackground
is set to false. Whether or not the flag can be set to false depends
on the type of change that has taken place. If font styles or
background colors for the redraw range have changed, clearBackground
should be set to true. If only foreground colors have changed for
the redraw range, clearBackground can be set to false.
@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>
@exception IllegalArgumentException <ul>
<li>ERROR_INVALID_RANGE when start and/or end are outside the widget content</li>
</ul>
Redraws the specified text range.
@param start offset of the first character to redraw @param length number of characters to redraw @param clearBackground true if the background should be cleared as part of the redraw operation. If true, the entire redraw range will be cleared before anything is redrawn. If the redraw range includes the last character of a line (i.e., the entire line is redrawn) the line is cleared all the way to the right border of the widget. The redraw operation will be faster and smoother if clearBackground is set to false. Whether or not the flag can be set to false depends on the type of change that has taken place. If font styles or background colors for the redraw range have changed, clearBackground should be set to true. If only foreground colors have changed for the redraw range, clearBackground can be set to false. @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> @exception IllegalArgumentException <ul> <li>ERROR_INVALID_RANGE when start and/or end are outside the widget content</li> </ul>