improvement for bar tag with slider.

-fix bug the slider is drawn outside of the bounds (FS#11658).
-offset the slider position so that the center of the slider indicates current position.
-add nobar option. if this option is set, the bar isn't drawn at all.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28248 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 7 insertions, 1 deletions

diff --git a/manual/appendix/wps_tags.tex b/manual/appendix/wps_tags.tex
index 92460e8b32..58d81e659d 100644
--- a/manual/appendix/wps_tags.tex
+++ b/manual/appendix/wps_tags.tex
@@ -650,16 +650,22 @@ Example:
   \item[vertical] -- force the bar to be drawn vertically.
   \item[invert] -- invert the draw direction (i.e. right to left, or top to
     bottom).
-  \item[slider] -- draw an preloaded image over the top of the bar. This must be
+  \item[slider] -- draw an preloaded image over the top of the bar so that
+    the centre of the image matches current position. This must be
     followed by the label of the desired image.
   \item[nofill] -- don't draw the fill bar, only the empty image (for the
     desired effect use with the ``slider'' option).
+  \item[nobar] -- don't draw the bar entirely including frame (for use
+    with the ``slider'' option).
 \end{description}
 
 Example: \config{\%pb(0,0,-,-,-,nofill, slider, slider\_image, invert)} -- draw
 a horizontal progressbar which doesn't fill and draws the image
 ``slider\_image'' which moves right to left.
 
+Note: if the slider option is used, the bar will be shrank so that the slider will fit
+ inside the specified width and height.
+
 \section{Other Tags}
 \begin{tagmap}
   \config{\%(}           & The character `('\\