* Headers/Additions/GNUstepGUI/GSTheme.h:

* Source/GSTheme.m:
Declare GSSliderHorizontalTrack and GSSliderVerticalTrack
part names for themeing the background of NSSlider
* Source/GSThemeDrawing.m:
Add new drawSliderBorderAndBackground:frame:inCell:isHorizontal:
method to draw the slider border and background.
* Source/GSThemePrivate.h:
* Source/GSThemeTools.m:
Add a -size method on GSDrawTiles which returns the total
original size of the tiles, so we can easily compute a rect
that scales the tiles in only one dimension.
* Source/NSSliderCell.m:
Override _drawBorderAndBackgroundWithFrame: to call new
GSTheme method. Also, tweak the knob drawing code; the knob
is now centered and drawn at its native size. This still looks
correct with the default slider sizes create by Gorm.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@37185 72102866-910b-0410-8b05-ffd578937521

Headers/Additions/GNUstepGUI/GSTheme.h

@@ -301,6 +301,10 @@ APPKIT_EXPORT  NSString        *GSProgressIndicatorBarDeterminate;
  */
 APPKIT_EXPORT  NSString        *GSColorWell;
 
+/* NSSliderCell parts */
+APPKIT_EXPORT  NSString        *GSSliderHorizontalTrack;
+APPKIT_EXPORT  NSString        *GSSliderVerticalTrack;
+
 /**
  * Structure to describe the size of top/bottom/left/right margins inside
  * a button
@@ -1132,6 +1136,11 @@ APPKIT_EXPORT	NSString	*GSThemeWillDeactivateNotification;
 - (void) drawScrollViewRect: (NSRect)rect
 	             inView: (NSView *)view;
 
+- (void) drawSliderBorderAndBackground: (NSBorderType)aType
+				 frame: (NSRect)cellFrame
+				inCell: (NSCell *)cell
+			  isHorizontal: (BOOL)horizontal;
+
 - (void) drawBarInside: (NSRect)rect
 		inCell: (NSCell *)cell
 	       flipped: (BOOL)flipped;