/** <title>GSDrawFunctions</title>

   <abstract>Useful/configurable drawing functions</abstract>

   Copyright (C) 2004 Free Software Foundation, Inc.

   Author: Adam Fedor <fedor@gnu.org>
   Date: Jan 2004
   
   This file is part of the GNU Objective C User interface library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 USA.
   */

#include "GNUstepGUI/GSDrawFunctions.h"
#include "AppKit/NSColor.h"
#include "AppKit/NSGraphics.h"
#include "AppKit/NSView.h"
#include "AppKit/PSOperators.h"


/**
  <unit>
  <heading>Class Description</heading>
  <p>
  This is a simple class used for encapsulating common drawing behaviors.
  These methods standardize drawing of buttons, borders and other common
  GUI elements. The drawing functions are encapsulated in a class to
  allow overriding of the methods so that these elements can be drawn
  in different ways (e.g. with themes).
  </p>
  <p>
  The default implementation uses the standard configurable colors defined in 
  NSColor, such as <code>controlLightHighlightColor</code>,
  <code>controlShadowColor</code> and  <code>controlDarkShadowColor</code>.
  </p>
  </unit>
*/ 
@implementation GSDrawFunctions

static id theTheme = nil;


+ (id) theme 
{
  if (theTheme == nil)
    {
      theTheme = [self new];
    }
  return theTheme;
}

+ (void) setTheme: (id) aTheme
{
  ASSIGN (theTheme, aTheme);
}

/** Tell current theme to draw a button border */
+ (NSRect) drawButton: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawButton: border : clip];
}

/** Tell current theme to draw a "dark" button border (used in tableviews) */
+ (NSRect) drawDarkButton: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawDarkButton: border : clip];
}

/** Tell current theme to draw a dark bezel border */
+ (NSRect) drawDarkBezel: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawDarkBezel: border : clip];
}

/** Tell current theme to draw a light bezel border */
+ (NSRect) drawLightBezel: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawLightBezel: border : clip];
}

/** Tell current theme to draw a white bezel border */
+ (NSRect) drawWhiteBezel: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawWhiteBezel: border : clip];
}

/** Tell current theme to draw a grey bezel border */
+ (NSRect) drawGrayBezel: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawGrayBezel: border : clip];
}

/** Tell current theme to draw a groove border */
+ (NSRect) drawGroove: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawGroove: border : clip];
}

/** Tell current theme to draw a frame photo border.  Used in NSImageView.   */
+ (NSRect) drawFramePhoto: (NSRect)border : (NSRect)clip
{
  return [[self theme] drawFramePhoto: border : clip];
}

/** Tell current theme to draw a gradient border. */
+ (NSRect) drawGradientBorder: (NSGradientType)gradientType 
		       inRect: (NSRect)border 
		     withClip: (NSRect)clip
{
  return [[self theme] drawGradientBorder: gradientType
				   inRect: border
				 withClip: clip];
}


- (NSRect) drawButton: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, 
			   NSMinXEdge, NSMaxYEdge, 
			   NSMaxXEdge, NSMinYEdge};
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, 
			   NSMinXEdge, NSMinYEdge, 
			   NSMaxXEdge, NSMaxYEdge};
  // These names are role names not the actual colours
  NSColor *black = [NSColor controlDarkShadowColor];
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *white = [NSColor controlLightHighlightColor];
  NSColor *colors[] = {black, black, white, white,
		       dark, dark};

  if ([[NSView focusView] isFlipped] == YES)
    {
      return NSDrawColorTiledRects(border, clip, dn_sides, colors, 6);
    }
  else
    {
      return NSDrawColorTiledRects(border, clip, up_sides, colors, 6);
    }
}

/** Draw a "dark" button border (used in tableviews) */
- (NSRect) drawDarkButton: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, 
			   NSMinXEdge, NSMaxYEdge}; 
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, 
			   NSMinXEdge, NSMinYEdge}; 
  // These names are role names not the actual colours
  NSColor *black = [NSColor controlDarkShadowColor];
  NSColor *white = [NSColor controlHighlightColor];
  NSColor *colors[] = {black, black, white, white};

  if ([[NSView focusView] isFlipped] == YES)
    {
      return NSDrawColorTiledRects(border, clip, dn_sides, colors, 4);
    }
  else
    {
      return NSDrawColorTiledRects(border, clip, up_sides, colors, 4);
    }
}

/** Draw a dark bezel border */
- (NSRect) drawDarkBezel: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, NSMinXEdge, NSMaxYEdge,
			   NSMinXEdge, NSMaxYEdge, NSMaxXEdge, NSMinYEdge};
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, NSMinXEdge, NSMinYEdge,
			   NSMinXEdge, NSMinYEdge, NSMaxXEdge, NSMaxYEdge};
  // These names are role names not the actual colours
  NSColor *black = [NSColor controlDarkShadowColor];
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *light = [NSColor controlColor];
  NSColor *white = [NSColor controlLightHighlightColor];
  NSColor *colors[] = {white, white, dark, dark, 
		       black, black, light, light};
  NSRect rect;

  if ([[NSView focusView] isFlipped] == YES)
    {
      rect = NSDrawColorTiledRects(border, clip, dn_sides, colors, 8);
  
      [dark set];
      PSrectfill(NSMinX(border) + 1., NSMinY(border) - 2., 1., 1.);
      PSrectfill(NSMaxX(border) - 2., NSMaxY(border) + 1., 1., 1.);
    }
  else
    {
      rect = NSDrawColorTiledRects(border, clip, up_sides, colors, 8);
  
      [dark set];
      PSrectfill(NSMinX(border) + 1., NSMinY(border) + 1., 1., 1.);
      PSrectfill(NSMaxX(border) - 2., NSMaxY(border) - 2., 1., 1.);
    }
  return rect;
}

/** Draw a light bezel border */
- (NSRect) drawLightBezel: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, NSMinXEdge, NSMaxYEdge, 
  			   NSMaxXEdge, NSMinYEdge, NSMinXEdge, NSMaxYEdge};
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, NSMinXEdge, NSMinYEdge, 
			   NSMaxXEdge, NSMaxYEdge, NSMinXEdge, NSMinYEdge};
  // These names are role names not the actual colours
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *light = [NSColor controlColor];
  NSColor *white = [NSColor controlLightHighlightColor];
  NSColor *colors[] = {white, white, dark, dark,
		       light, light, dark, dark};

  if ([[NSView focusView] isFlipped] == YES)
    {
      return NSDrawColorTiledRects(border, clip, dn_sides, colors, 8);
    }
  else
    {
      return NSDrawColorTiledRects(border, clip, up_sides, colors, 8);
    }
}

/** Draw a white bezel border */
- (NSRect) drawWhiteBezel: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxYEdge, NSMaxXEdge, NSMinYEdge, NSMinXEdge,
  			   NSMaxYEdge, NSMaxXEdge, NSMinYEdge, NSMinXEdge};
  NSRectEdge dn_sides[] = {NSMinYEdge, NSMaxXEdge, NSMaxYEdge, NSMinXEdge, 
  			     NSMinYEdge, NSMaxXEdge, NSMaxYEdge, NSMinXEdge};
  // These names are role names not the actual colours
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *light = [NSColor controlColor];
  NSColor *white = [NSColor controlLightHighlightColor];
  NSColor *colors[] = {dark, white, white, dark,
		       dark, light, light, dark};

  if ([[NSView focusView] isFlipped] == YES)
    {
      return NSDrawColorTiledRects(border, clip, dn_sides, colors, 8);
    }
  else
    {
      return NSDrawColorTiledRects(border, clip, up_sides, colors, 8);
    }
}

/** Draw a grey bezel border */
- (NSRect) drawGrayBezel: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, NSMinXEdge, NSMaxYEdge,
			   NSMaxXEdge, NSMinYEdge, NSMinXEdge, NSMaxYEdge};
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, NSMinXEdge, NSMinYEdge,
			     NSMaxXEdge, NSMaxYEdge, NSMinXEdge, NSMinYEdge};
  // These names are role names not the actual colours
  NSColor *black = [NSColor controlDarkShadowColor];
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *light = [NSColor controlColor];
  NSColor *white = [NSColor controlLightHighlightColor];
  NSColor *colors[] = {white, white, dark, dark,
		       light, light, black, black};
  NSRect rect;

  if ([[NSView focusView] isFlipped] == YES)
    {
      rect = NSDrawColorTiledRects(border, clip, dn_sides, colors, 8);
      [dark set];
      PSrectfill(NSMinX(border) + 1., NSMaxY(border) - 2., 1., 1.);
      PSrectfill(NSMaxX(border) - 2., NSMinY(border) + 1., 1., 1.);
    }
  else
    {
      rect = NSDrawColorTiledRects(border, clip, up_sides, colors, 8);
      [dark set];
      PSrectfill(NSMinX(border) + 1., NSMinY(border) + 1., 1., 1.);
      PSrectfill(NSMaxX(border) - 2., NSMaxY(border) - 2., 1., 1.);
    }
  return rect;
}

/** Draw a groove border */
- (NSRect) drawGroove: (NSRect)border : (NSRect)clip
{
  // go clockwise from the top twice -- makes the groove come out right
  NSRectEdge up_sides[] = {NSMaxYEdge, NSMaxXEdge, NSMinYEdge, NSMinXEdge,
			   NSMaxYEdge, NSMaxXEdge, NSMinYEdge, NSMinXEdge};
  NSRectEdge dn_sides[] = {NSMinYEdge, NSMaxXEdge, NSMaxYEdge, NSMinXEdge,
			   NSMinYEdge, NSMaxXEdge, NSMaxYEdge, NSMinXEdge};
  // These names are role names not the actual colours
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *white = [NSColor controlLightHighlightColor];
  NSColor *colors[] = {dark, white, white, dark,
		       white, dark, dark, white};

  if ([[NSView focusView] isFlipped] == YES)
    {
      return NSDrawColorTiledRects(border, clip, dn_sides, colors, 8);
    }
  else
    {
      return NSDrawColorTiledRects(border, clip, up_sides, colors, 8);
    }
}

/** Draw a frame photo border.  Used in NSImageView.   */
- (NSRect) drawFramePhoto: (NSRect)border : (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, 
			   NSMinXEdge, NSMaxYEdge, 
			   NSMaxXEdge, NSMinYEdge};
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, 
			   NSMinXEdge, NSMinYEdge, 
			   NSMaxXEdge, NSMaxYEdge};
  // These names are role names not the actual colours
  NSColor *black = [NSColor controlDarkShadowColor];
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *colors[] = {dark, dark, dark, dark, 
		       black,black};

  if ([[NSView focusView] isFlipped] == YES)
    {
      return NSDrawColorTiledRects(border, clip, dn_sides, colors, 6);
    }
  else
    {
      return NSDrawColorTiledRects(border, clip, up_sides, colors, 6);
    }
}

/** Draw a gradient border. */
- (NSRect) drawGradientBorder: (NSGradientType)gradientType 
		       inRect: (NSRect)border 
		     withClip: (NSRect)clip
{
  NSRectEdge up_sides[] = {NSMaxXEdge, NSMinYEdge, 
			   NSMinXEdge, NSMaxYEdge};
  NSRectEdge dn_sides[] = {NSMaxXEdge, NSMaxYEdge, 
			   NSMinXEdge, NSMinYEdge};
  NSColor *black = [NSColor controlDarkShadowColor];
  NSColor *dark = [NSColor controlShadowColor];
  NSColor *light = [NSColor controlColor];
  NSColor **colors;
  NSColor *concaveWeak[] = {dark, dark, 
			    light, light};
  NSColor *concaveStrong[] = {black, black, 
			      light, light};
  NSColor *convexWeak[] = {light, light,
			   dark, dark};
  NSColor *convexStrong[] = {light, light,
			     black, black};
  NSRect rect;
  
  switch (gradientType)
    {
      case NSGradientConcaveWeak:
	colors = concaveWeak;
	break;
      case NSGradientConcaveStrong:
	colors = concaveStrong;
	break;
      case NSGradientConvexWeak:
	colors = convexWeak;
	break;
      case NSGradientConvexStrong:
	colors = convexStrong;
	break;
      case NSGradientNone:
      default:
	return border;
    }

  if ([[NSView focusView] isFlipped] == YES)
    {
      rect = NSDrawColorTiledRects(border, clip, dn_sides, colors, 4);
    }
  else
    {
      rect = NSDrawColorTiledRects(border, clip, up_sides, colors, 4);
    }
 
  return rect;
}

@end