/** <title>NSImageCell</title>

   <abstract>The image cell class</abstract>

   Copyright (C) 1999 Free Software Foundation, Inc.

   Author: Jonathan Gapen <jagapen@smithlab.chem.wisc.edu>
   Date: 1999

   This file is part of the GNUstep GUI 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; see the file COPYING.LIB.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <gnustep/gui/config.h>
#include <Foundation/NSDebug.h>
#include <AppKit/NSCell.h>
#include <AppKit/NSGraphics.h>
#include <AppKit/NSImageCell.h>
#include <AppKit/NSImage.h>

@implementation NSImageCell

//
// Class methods
//
+ (void) initialize
{
  if (self == [NSImageCell class])
    {
      [self setVersion: 1];
    }
}

//
// Instance methods
//
- (id) init
{
  [self initImageCell: nil];

  return self;
}

- (void) setImage:(NSImage *)anImage
{
  [super setImage:anImage];
  if (anImage)
    _original_image_size = [anImage size];
  else
    _original_image_size = NSMakeSize(1,1);
}

//
// Aligning and scaling the image
//
- (NSImageAlignment) imageAlignment
{
  return _imageAlignment;
}

- (void) setImageAlignment: (NSImageAlignment)anAlignment
{
  NSDebugLLog(@"NSImageCell", @"NSImageCell -setImageAlignment");
  _imageAlignment = anAlignment;
}

- (NSImageScaling) imageScaling
{
  return _imageScaling;
}

- (void) setImageScaling: (NSImageScaling)scaling
{
  _imageScaling = scaling;
}

//
// Choosing the frame
//
- (NSImageFrameStyle) imageFrameStyle
{
  return _frameStyle;
}

- (void) setImageFrameStyle: (NSImageFrameStyle)aFrameStyle
{
  // We could set  _cell.is_bordered and _cell.is_bezeled here to reflect
  // the border type, but this wont be used.
  _frameStyle = aFrameStyle;
}

//
// Displaying
//
- (void) drawWithFrame: (NSRect)cellFrame inView: (NSView *)controlView
{
  NSDebugLLog(@"NSImageCell", @"NSImageCell -drawWithFrame");

  // do nothing if cell's frame rect is zero
  if (NSIsEmptyRect(cellFrame) || ![controlView window])
    return;
  
  // draw the border if needed
  switch (_frameStyle)
    {
      case NSImageFrameNone:
	// nada
	break;
      case NSImageFramePhoto:
	[controlView lockFocus];
	NSDrawFramePhoto(cellFrame, NSZeroRect);
	[controlView unlockFocus];
	break;
      case NSImageFrameGrayBezel:
	[controlView lockFocus];
	NSDrawGrayBezel(cellFrame, NSZeroRect);
	[controlView unlockFocus];
	break;
      case NSImageFrameGroove:
	[controlView lockFocus];
	NSDrawGroove(cellFrame, NSZeroRect);
	[controlView unlockFocus];
	break;
      case NSImageFrameButton:
	[controlView lockFocus];
	NSDrawButton(cellFrame, NSZeroRect);
	[controlView unlockFocus];
	break;
    }

  [self drawInteriorWithFrame: cellFrame inView: controlView];
}

static inline float
xLeftInRect(NSSize innerSize, NSRect outerRect)
{
  return NSMinX(outerRect);
}

static inline float
xCenterInRect(NSSize innerSize, NSRect outerRect)
{
  return MAX(NSMidX(outerRect) - (innerSize.width/2.0), 0.0);
}

static inline float
xRightInRect(NSSize innerSize, NSRect outerRect)
{
  return MAX(NSMaxX(outerRect) - innerSize.width, 0.0);
}

static inline float
yTopInRect(NSSize innerSize, NSRect outerRect, BOOL flipped)
{
  if (flipped)
    return NSMinY(outerRect);
  else
    return MAX(NSMaxY(outerRect) - innerSize.height, 0.0);
}

static inline float
yCenterInRect(NSSize innerSize, NSRect outerRect, BOOL flipped)
{
  return MAX(NSMidY(outerRect) - innerSize.height/2.0, 0.0);
}

static inline float
yBottomInRect(NSSize innerSize, NSRect outerRect, BOOL flipped)
{
  if (flipped)
    return MAX(NSMaxY(outerRect) - innerSize.height, 0.0);
  else
    return NSMinY(outerRect);
}

static inline NSSize
scaleProportionally(NSSize imageSize, NSRect canvasRect)
{
  float ratio;

  // get the smaller ratio and scale the image size by it
  ratio = MIN(NSWidth(canvasRect) / imageSize.width,
	      NSHeight(canvasRect) / imageSize.height);

  imageSize.width *= ratio;
  imageSize.height *= ratio;

  return imageSize;
}

- (void) drawInteriorWithFrame: (NSRect)cellFrame inView: (NSView *)controlView
{
  NSPoint	position;
  BOOL		is_flipped = [controlView isFlipped];
  NSSize        imageSize;

  NSDebugLLog(@"NSImageCell", @"NSImageCell drawInteriorWithFrame called");

  if (![controlView window] || !_cell_image)
    return;

  // leave room for the frame
  cellFrame = [self drawingRectForBounds: cellFrame];

  switch (_imageScaling)
    {
      case NSScaleProportionally:
	{
	  NSDebugLLog(@"NSImageCell", @"NSScaleProportionally");
	  [_cell_image setScalesWhenResized:YES];
	  [_cell_image setSize: scaleProportionally (_original_image_size, 
						     cellFrame)];
	  break;
	}
      case NSScaleToFit:
	{
	  NSDebugLLog(@"NSImageCell", @"NSScaleToFit");
	  [_cell_image setScalesWhenResized:YES];
	  [_cell_image setSize: cellFrame.size];
	  break;
	}
      case NSScaleNone:
	{
	  NSDebugLLog(@"NSImageCell", @"NSScaleNone");
	  [_cell_image setScalesWhenResized:NO];
	  // don't let the image size overrun the space available
	  if (_original_image_size.width > cellFrame.size.width
	    || _original_image_size.height > cellFrame.size.height)
	    [_cell_image setSize: cellFrame.size];
	  else
	    [_cell_image setSize: _original_image_size];
	  break;
	}
    }

  imageSize = [_cell_image size];

  switch (_imageAlignment)
    {
      case NSImageAlignLeft:
	position.x = xLeftInRect(imageSize, cellFrame);
	position.y = yCenterInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignRight:
	position.x = xRightInRect(imageSize, cellFrame);
	position.y = yCenterInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignCenter:
	position.x = xCenterInRect(imageSize, cellFrame);
	position.y = yCenterInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignTop:
	position.x = xCenterInRect(imageSize, cellFrame);
	position.y = yTopInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignBottom:
	position.x = xCenterInRect(imageSize, cellFrame);
	position.y = yBottomInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignTopLeft:
	position.x = xLeftInRect(imageSize, cellFrame);
	position.y = yTopInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignTopRight:
	position.x = xRightInRect(imageSize, cellFrame);
	position.y = yTopInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignBottomLeft:
	position.x = xLeftInRect(imageSize, cellFrame);
	position.y = yBottomInRect(imageSize, cellFrame, is_flipped);
	break;
      case NSImageAlignBottomRight:
	position.x = xRightInRect(imageSize, cellFrame);
	position.y = yBottomInRect(imageSize, cellFrame, is_flipped);
	break;
    }

  // account for flipped views
  if (is_flipped)
    position.y += imageSize.height;

  // draw!
  [controlView lockFocus];
  [_cell_image compositeToPoint: position operation: NSCompositeSourceOver];

  if (_cell.shows_first_responder)
    NSDottedFrameRect(cellFrame);

  [controlView unlockFocus];
}

- (NSSize) cellSize
{
  NSSize borderSize, s;
  
  // Get border size
  switch (_frameStyle)
    {
      case NSImageFrameNone:
	borderSize = NSZeroSize;
	break;
      case NSImageFramePhoto:
	// FIXME
	borderSize = _sizeForBorderType (NSNoBorder);
	break;
      case NSImageFrameGrayBezel:
      case NSImageFrameGroove:
      case NSImageFrameButton:
	borderSize = _sizeForBorderType (NSBezelBorder); 
	break;
    }
  
  // Get Content Size
  s = _original_image_size;
  
  // Add in border size
  s.width += 2 * borderSize.width;
  s.height += 2 * borderSize.height;
  
  return s;
}

- (NSRect) drawingRectForBounds: (NSRect)theRect
{
  NSSize borderSize;

  // Get border size
  switch (_frameStyle)
    {
    case NSImageFrameNone:
      borderSize = NSZeroSize;
      break;
    case NSImageFramePhoto:
      // what does this one look like? TODO (in sync with the rest of the code)
      borderSize = _sizeForBorderType (NSNoBorder);
      break;
    case NSImageFrameGrayBezel:
    case NSImageFrameGroove:
    case NSImageFrameButton:
      borderSize = _sizeForBorderType (NSBezelBorder); 
      break;
    }

  return NSInsetRect (theRect, borderSize.width, borderSize.height);
}

//
// NSCoding protocol
//
- (void) encodeWithCoder: (NSCoder *)aCoder
{
  [super encodeWithCoder: aCoder];

  [aCoder encodeValueOfObjCType: @encode(NSImageAlignment) at: &_imageAlignment];
  [aCoder encodeValueOfObjCType: @encode(NSImageFrameStyle) at: &_frameStyle];
  [aCoder encodeValueOfObjCType: @encode(NSImageScaling) at: &_imageScaling];
  [aCoder encodeSize: _original_image_size];
}

- (id) initWithCoder: (NSCoder *)aDecoder
{
  [super initWithCoder: aDecoder];

  [aDecoder decodeValueOfObjCType: @encode(NSImageAlignment) at: &_imageAlignment];
  [aDecoder decodeValueOfObjCType: @encode(NSImageFrameStyle) at: &_frameStyle];
  [aDecoder decodeValueOfObjCType: @encode(NSImageScaling) at: &_imageScaling];
  _original_image_size = [aDecoder decodeSize];
  return self;
}

@end