Description Jim Mayer 2014-08-28 15:41:48 EDT

Created attachment 246513 [details]
Program that illustrates the problem.

The method "Rectangle getLineBounds(int lineIndex) on TextLayout is supposed to return the bounding box for the given line of text.  It works correctly when the orientation is set to SWT.LEFT_TO_RIGHT.  When the orientation is set to SWT.RIGHT_TO_LEFT, however, the returned bounding box is flipped from the displayed text for SWT.LEFT or SWT.RIGHT alignment.

I have attached a sample program that exhibits the problem.  It renders text using a TextLayout and draws a rectangle on the bounds of each line.  There is a check box that flips the LEFT_TO_RIGHT/RIGHT_TO_LEFT setting.

To repeat, compile and run the program then select the "RTL" check box.  Notice that the bounding box for each line has the wrong alignment.

I believe that the problem is in the getLineBounds method itself.  Removing the following lines from that method appears to fix the problem:

	if (OS.pango_context_get_base_dir(context) == OS.PANGO_DIRECTION_RTL) {
		x = width() - x - width;
	}

Jim Mayer