How to use

getExtent

method

in

org.eclipse.jface.text.TextViewer

/**
 * Returns the width of the representation of a text range in the
 * visible region of the viewer's document as drawn in this viewer's
 * widget.
 *
 * @param offset the offset of the text range in the visible region
 * @param length the length of the text range in the visible region
 * @return the width of the presentation of the specified text range
 * @since 2.0
 */
final protected int getWidthInPixels(int offset, int length) {
  return getExtent(offset, offset + length).getLength();
}

/**
 * Returns the width of the representation of a text range in the
 * visible region of the viewer's document as drawn in this viewer's
 * widget.
 *
 * @param offset the offset of the text range in the visible region
 * @param length the length of the text range in the visible region
 * @return the width of the presentation of the specified text range
 * @since 2.0
 */
final protected int getWidthInPixels(int offset, int length) {
  return getExtent(offset, offset + length).getLength();
}

IRegion extent= getExtent(start, start);
startPixel= extent.getOffset() + fTextWidget.getHorizontalPixel();
endPixel= startPixel;
IRegion extent= getExtent(start, end);
startPixel= extent.getOffset() + fTextWidget.getHorizontalPixel();
endPixel= startPixel + extent.getLength();

IRegion extent= getExtent(start, start);
startPixel= extent.getOffset() + fTextWidget.getHorizontalPixel();
endPixel= startPixel;
IRegion extent= getExtent(start, end);
startPixel= extent.getOffset() + fTextWidget.getHorizontalPixel();
endPixel= startPixel + extent.getLength();